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Wu X, Wu Z, Deng W, Xu R, Ban C, Sun X, Zhao Q. Spatiotemporal evolution of AML immune microenvironment remodeling and RNF149-driven drug resistance through single-cell multidimensional analysis. J Transl Med 2023; 21:760. [PMID: 37891580 PMCID: PMC10612211 DOI: 10.1186/s12967-023-04579-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 09/28/2023] [Indexed: 10/29/2023] Open
Abstract
BACKGROUND The composition of the bone marrow immune microenvironment in patients with acute myeloid leukaemia (AML) was analysed by single-cell sequencing and the evolutionary role of different subpopulations of T cells in the development of AML and in driving drug resistance was explored in conjunction with E3 ubiquitin ligase-related genes. METHODS To elucidate the mechanisms underlying AML-NR and Ara-C resistance, we analyzed the bone marrow immune microenvironment of AML patients by integrating multiple single-cell RNA sequencing datasets. When compared to the AML disease remission (AML-CR) cohort, AML-NR displayed distinct cellular interactions and alterations in the ratios of CD4+T, Treg, and CD8+T cell populations. RESULTS Our findings indicate that the E3 ubiquitin ligase RNF149 accelerates AML progression, modifies the AML immune milieu, triggers CD8+T cell dysfunction, and influences the transformation of CD8+ Navie.T cells to CD8+TExh, culminating in diminished AML responsiveness to chemotherapeutic agents. Experiments both in vivo and in vitro revealed RNF149's role in enhancing AML drug-resistant cell line proliferation and in apoptotic inhibition, fostering resistance to Ara-C. CONCLUSION In essence, the immune microenvironments of AML-CR and AML-NR diverge considerably, spotlighting RNF149's tumorigenic function in AML and cementing its status as a potential prognostic indicator and innovative therapeutic avenue for countering AML resistance.
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Affiliation(s)
- Xin Wu
- Department of spine surgery, Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China
| | - Zhongguang Wu
- Department of Clinical Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, Guangdong, P.R. China
| | - Woding Deng
- Xiangya School of Medicine, Central South University, Changsha, 410013, Hunan, China
| | - Rong Xu
- Department of Pathology, The First People's Hospital of Changde City, Changde, 415003, Hunan, China
| | - Chunmei Ban
- Department of Hematology, The People's Hospital of Liuzhou City, Guangxi, 545026, People's Republic of China
| | - Xiaoying Sun
- The First Hospital of Sun Yat-sen University, Guangzhou, 510080, Guangdong, China.
- School of Nursing, Sun Yat-sen University, Guangzhou, 528406, China.
| | - Qiangqiang Zhao
- Department of Hematology, The People's Hospital of Liuzhou City, Guangxi, 545026, People's Republic of China.
- Department of Hematology, The Qinghai Provincial People's Hospital, Xining, 810007, People's Republic of China.
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Nickerson TR, Antonio EN, McNally DP, Toney MF, Ban C, Straub AP. Unlocking the potential of polymeric desalination membranes by understanding molecular-level interactions and transport mechanisms. Chem Sci 2023; 14:751-770. [PMID: 36755730 PMCID: PMC9890600 DOI: 10.1039/d2sc04920a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Accepted: 12/09/2022] [Indexed: 12/15/2022] Open
Abstract
Polyamide reverse osmosis (PA-RO) membranes achieve remarkably high water permeability and salt rejection, making them a key technology for addressing water shortages through processes including seawater desalination and wastewater reuse. However, current state-of-the-art membranes suffer from challenges related to inadequate selectivity, fouling, and a poor ability of existing models to predict performance. In this Perspective, we assert that a molecular understanding of the mechanisms that govern selectivity and transport of PA-RO and other polymer membranes is crucial to both guide future membrane development efforts and improve the predictive capability of transport models. We summarize the current understanding of ion, water, and polymer interactions in PA-RO membranes, drawing insights from nanofiltration and ion exchange membranes. Building on this knowledge, we explore how these interactions impact the transport properties of membranes, highlighting assumptions of transport models that warrant further investigation to improve predictive capabilities and elucidate underlying transport mechanisms. We then underscore recent advances in in situ characterization techniques that allow for direct measurements of previously difficult-to-obtain information on hydrated polymer membrane properties, hydrated ion properties, and ion-water-membrane interactions as well as powerful computational and electrochemical methods that facilitate systematic studies of transport phenomena.
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Affiliation(s)
- Trisha R. Nickerson
- Department of Chemical and Biological Engineering, University of Colorado BoulderBoulderCO 80309USA
| | - Emma N. Antonio
- Department of Chemical and Biological Engineering, University of Colorado BoulderBoulderCO 80309USA,Materials Science and Engineering Program, University of Colorado BoulderBoulderCO 80309USA
| | - Dylan P. McNally
- Materials Science and Engineering Program, University of Colorado BoulderBoulderCO 80309USA
| | - Michael F. Toney
- Department of Chemical and Biological Engineering, University of Colorado BoulderBoulderCO 80309USA,Materials Science and Engineering Program, University of Colorado BoulderBoulderCO 80309USA,Renewable and Sustainable Energy Institute, University of Colorado BoulderBoulderCO 80309USA
| | - Chunmei Ban
- Materials Science and Engineering Program, University of Colorado Boulder Boulder CO 80309 USA .,Department of Mechanical Engineering, University of Colorado Boulder Boulder CO 80309 USA
| | - Anthony P. Straub
- Materials Science and Engineering Program, University of Colorado BoulderBoulderCO 80309USA,Department of Civil, Environmental and Architectural Engineering, University of Colorado BoulderBoulderColorado 80309USA
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Dong L, Bai Q, Song W, Ban C. Abnormal expression of galectin-1, -3 leading to unexplained infertility by decreasing endometrial receptivity: a retrospective analysis. Am J Transl Res 2023; 15:493-501. [PMID: 36777856 PMCID: PMC9908466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 12/22/2022] [Indexed: 02/14/2023]
Abstract
OBJECTIVE To explore the relationship between galectin-1, -3 and unexplained infertility and the effect on endometrial receptivity. METHODS The clinical data of 100 female patients at childbearing age coming to Xingtai People's Hospital from February 2019 to February 2021 were collected retrospectively. Based on normal pregnancy or not, 50 infertility patients were placed into an infertility group, and 50 patients with normal pregnancy history were placed into a normal group. The mRNA and protein levels of galectin-1, -3, endometrial wave-like activity, endometrial thickness, uterine artery pulsatility index (PI), resistance index (RI), end diastolic velocity (EDV) and peak systolic velocity (PSV) ratio (S/D = PSV/EDV) were compared between the two groups of patients. RESULTS The mRNA and protein levels of galectin-1, -3 in the infertile group were lower than those in the normal group (P<0.05). In addition, the endometrial wave-like activity in the infertile group was more than that in the normal group (P<0.05). The endometrial thickness was less, while PI, RI and S/D were higher in the infertile group than those in the normal group (P<0.05). CONCLUSION The low mRNA and protein expressions of galectin-1, -3 in unexplained infertility can affect endometrial receptivity, which may be closely related to unexplained infertility.
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Affiliation(s)
- Liyuan Dong
- Department of Reproductive Medicine, Xingtai People’s HospitalXingtai 054000, Hebei, China
| | - Qingbing Bai
- Department of Orthopedics, General Hospital of Jizhong Energy Xingtai Mining Group Co., LTDXingtai 054000, Hebei, China
| | - Wenshuang Song
- Department of Obstetric, Xingtai People’s HospitalXingtai 054000, Hebei, China
| | - Chunmei Ban
- Department of Obstetric, Xingtai People’s HospitalXingtai 054000, Hebei, China
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Wang R, Zhao C, Jiang S, Zhang Z, Ban C, Zheng G, Hou Y, Jin B, Shi Y, Wu X, Zhao Q. Advanced nanoparticles that can target therapy and reverse drug resistance may be the dawn of leukemia treatment: A bibliometrics study. Front Bioeng Biotechnol 2022; 10:1027868. [PMID: 36299285 PMCID: PMC9588980 DOI: 10.3389/fbioe.2022.1027868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 09/14/2022] [Indexed: 12/24/2022] Open
Abstract
With the development of nanomedicine, more and more nanoparticles are used in the diagnosis and treatment of leukemia. This study aimed to identify author, country, institutional, and journal collaborations and their impacts, assess the knowledge base, identify existing trends, and uncover emerging topics related to leukemia research. 1825 Articles and reviews were obtained from the WoSCC and analyzed by Citespace and Vosviewer. INTERNATIONAL JOURNAL OF NANOMEDICINE is the journal with the highest output. The contribution of FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY is also noteworthy. The three main aspects of research in Nanoparticles-leukemia-related fields included nanoparticles for the diagnosis and treatment of leukemia, related to the type and treatment of leukemia, the specific molecular mechanism, and existing problems of the application of nanoparticles in leukemia. In the future, synthesize nano-drugs that have targeted therapy and chemotherapy resistance according to the mechanism, which may be the dawn of the solution to leukemia. This study offers a comprehensive overview of the Nanoparticles-leukemia-related field using bibliometrics and visual methods for the first time, providing a valuable reference for researchers interested in Nanoparticles-leukemia.
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Affiliation(s)
- Rui Wang
- Department of Hematology, Shandong Second Provincial General Hospital, Jinan, China
| | - Changming Zhao
- Department of Hematology, Shandong Second Provincial General Hospital, Jinan, China
| | - Shuxia Jiang
- Department of Hematology, The Qinghai Provincial People’s Hospital, Xining, China
| | - Zhaohua Zhang
- Department of Hematology, The Qinghai Provincial People’s Hospital, Xining, China
| | - Chunmei Ban
- Department of Hematology, Hematology Department, The People’s Hospital of Liuzhou City, Liuzhou, China
| | - Guiping Zheng
- Department of Hematology, The Qinghai Provincial People’s Hospital, Xining, China
| | - Yan Hou
- Department of Hematology, The Qinghai Provincial People’s Hospital, Xining, China
| | - Bingjin Jin
- Department of Pharmacy, The Qinghai Provincial People’s Hospital, Xining, China
| | - Yannan Shi
- Department of General Medicine, Ganmei Hospital, Kunming First People’s Hospital, Kunming, China
| | - Xin Wu
- Department of Spine Surgery, Third Xiangya Hospital, Central South University, Changsha, China
- *Correspondence: Xin Wu, ; Qiangqiang Zhao,
| | - Qiangqiang Zhao
- Department of Hematology, The Qinghai Provincial People’s Hospital, Xining, China
- *Correspondence: Xin Wu, ; Qiangqiang Zhao,
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Wen X, Yu Z, Zhao Y, Zhang J, Qiao R, Cheng L, Ban C, Guo J. Enabling Magnesium Anodes by Tuning the Electrode/Electrolyte Interfacial Structure. ACS Appl Mater Interfaces 2021; 13:52461-52468. [PMID: 34719233 DOI: 10.1021/acsami.1c10446] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A new deposition mechanism is presented in this study to achieve highly reversible plating and stripping of magnesium (Mg) anodes for Mg-ion batteries. It is known that the reduction of electrolyte anions such as bis(trifluoromethanesulfonyl)imide (TFSI-) causes Mg surface passivation, resulting in poor electrochemical performance for Mg-ion batteries. We reveal that the addition of sodium cations (Na+) in Mg-ion electrolytes can fundamentally alter the interfacial chemistry and structure at the Mg anode surface. The molecular dynamics simulation suggests that Na+ cations contribute to a significant population in the interfacial double layer so that TFSI- anions are excluded from the immediate interface adjacent to the Mg anode. As a result, the TFSI- decomposition is largely suppressed so does the formation of passivation layers at the Mg surface. This mechanism is supported by our electrochemical, microscopic, and spectroscopic analyses. The resultant Mg deposition demonstrates smooth surface morphology and lowered overpotential compared to the pure Mg(TFSI)2 electrolyte.
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Affiliation(s)
- Xiaoyu Wen
- Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States
| | - Zhou Yu
- Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Yifan Zhao
- Materials Science and Engineering Program, University of California, Riverside, California 92521, United States
| | - Jian Zhang
- Materials Science and Engineering Program, University of California, Riverside, California 92521, United States
| | - Rui Qiao
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Lei Cheng
- Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Chunmei Ban
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Juchen Guo
- Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States
- Materials Science and Engineering Program, University of California, Riverside, California 92521, United States
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6
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Ban C, Yang F, Wei M, Liu Q, Wang J, Chen L, Lu L, Xie D, Liu L, Huang J. Integrative Analysis of Gene Expression Through One-Class Logistic Regression Machine Learning Identifies Stemness Features in Multiple Myeloma. Front Genet 2021; 12:666561. [PMID: 34484287 PMCID: PMC8415636 DOI: 10.3389/fgene.2021.666561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 07/19/2021] [Indexed: 01/09/2023] Open
Abstract
Tumor progression includes the obtainment of progenitor and stem cell-like features and the gradual loss of a differentiated phenotype. Stemness was defined as the potential for differentiation and self-renewal from the cell of origin. Previous studies have confirmed the effective application of stemness in a number of malignancies. However, the mechanisms underlying the growth and maintenance of multiple myeloma (MM) stem cells remain unclear. We calculated the stemness index for samples of MM by utilizing a novel one-class logistic regression (OCLR) machine learning algorithm and found that mRNA expression-based stemness index (mRNAsi) was an independent prognostic factor of MM. Based on the same cutoff value, mRNAsi could stratify MM patients into low and high groups with different outcomes. We identified 127 stemness-related signatures using weighted gene co-expression network analysis (WGCNA) and differential expression analysis. Functional annotation and pathway enrichment analysis indicated that these genes were mainly involved in the cell cycle, cell differentiation, and DNA replication and repair. Using the molecular complex detection (MCODE) algorithm, we identified 34 pivotal signatures. Meanwhile, we conducted unsupervised clustering and classified the MM cohorts into three MM stemness (MMS) clusters with distinct prognoses. Samples in MMS-cluster3 possessed the highest stemness fractions and the worst prognosis. Additionally, we applied the ESTIMATE algorithm to infer differential immune infiltration among the three MMS clusters. The immune core and stromal score were significantly lower in MMS-cluster3 than in the other clusters, supporting the negative relation between stemness and anticancer immunity. Finally, we proposed a prognostic nomogram that allows for individualized assessment of the 3- and 5-year overall survival (OS) probabilities among patients with MM. Our study comprehensively assessed the MM stemness index based on large cohorts and built a 34-gene based classifier for predicting prognosis and potential strategies for stemness treatment.
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Affiliation(s)
- Chunmei Ban
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Feiyan Yang
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Min Wei
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Qin Liu
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Jiankun Wang
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Lei Chen
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Liuting Lu
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Dongmei Xie
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Lie Liu
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
| | - Jinxiong Huang
- Department of Hematology, Liuzhou People's Hospital, Liuzhou, China
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7
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Liang Z, Ban C. Strategies to Enable Reversible Magnesium Electrochemistry: From Electrolytes to Artificial Solid–Electrolyte Interphases. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202006472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhiming Liang
- Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Drive Boulder CO USA
| | - Chunmei Ban
- Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Drive Boulder CO USA
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8
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Liang Z, Ban C. Strategies to Enable Reversible Magnesium Electrochemistry: From Electrolytes to Artificial Solid–Electrolyte Interphases. Angew Chem Int Ed Engl 2021; 60:11036-11047. [DOI: 10.1002/anie.202006472] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/05/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Zhiming Liang
- Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Drive Boulder CO USA
| | - Chunmei Ban
- Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Drive Boulder CO USA
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9
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Periyapperuma K, Arca E, Harvey S, Pathirana T, Ban C, Burrell A, Pozo-Gonzalo C, Howlett PC. High Current Cycling in a Superconcentrated Ionic Liquid Electrolyte to Promote Uniform Li Morphology and a Uniform LiF-Rich Solid Electrolyte Interphase. ACS Appl Mater Interfaces 2020; 12:42236-42247. [PMID: 32877167 DOI: 10.1021/acsami.0c09074] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
High-energy-density systems with fast charging rates and suppressed dendrite growth are critical for the implementation of efficient and safe next-generation advanced battery technologies such as those based on Li metal. However, there are few studies that investigate reliable cycling of Li metal electrodes under high-rate conditions. Here, by employing a superconcentrated ionic liquid (IL) electrolyte, we highlight the effect of Li salt concentration and applied current density on the resulting Li deposit morphology and solid electrolyte interphase (SEI) characteristics, demonstrating exceptional deposition/dissolution rates and efficiency in these systems. Operation at higher current densities enhanced the cycling efficiency, e.g., from 64 ± 3% at 1 mA cm-2 up to 96 ± 1% at 20 mA cm-2 (overpotential <±0.2 V), while resulting in lower electrode resistance and dendrite-free Li morphology. A maximum current density of 50 mA cm-2 resulted in 88 ± 3% cycling efficiency, displaying tolerance for high overpotentials at the Ni working electrode (0.5 V). X-ray photoelectron microscopy (XPS), time-of-flight secondary-ion mass spectroscopy (ToF-SIMS), and scanning electron microscopy (SEM) surface measurements revealed that the formation of a stable SEI, rich in LiF and deficient in organic carbon species, coupled with nondendritic and compact Li morphologies enabled enhanced cycling efficiency at higher currents. Reduced dendrite formation at high current is further highlighted by the use of a highly porous separator in coin cell cycling (1 mAh cm-2 at 50 °C), sustaining 500 cycles at 10 mA cm-2.
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Affiliation(s)
- Kalani Periyapperuma
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Melbourne, VIC 3125, Australia
| | - Elisabetta Arca
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Steven Harvey
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Thushan Pathirana
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Melbourne, VIC 3125, Australia
| | - Chunmei Ban
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Anthony Burrell
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Cristina Pozo-Gonzalo
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Melbourne, VIC 3125, Australia
| | - Patrick C Howlett
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Melbourne, VIC 3125, Australia
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Schnabel M, Harvey SP, Arca E, Stetson C, Teeter G, Ban C, Stradins P. Surface SiO 2 Thickness Controls Uniform-to-Localized Transition in Lithiation of Silicon Anodes for Lithium-Ion Batteries. ACS Appl Mater Interfaces 2020; 12:27017-27028. [PMID: 32407075 DOI: 10.1021/acsami.0c03158] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Silicon is a promising anode material for lithium-ion batteries because of its high capacity, but its widespread adoption has been hampered by a low cycle life arising from mechanical failure and the absence of a stable solid-electrolyte interphase (SEI). Understanding SEI formation and its impact on cycle life is made more complex by the oxidation of silicon materials in air or during synthesis, which leads to SiOx coatings of varying thicknesses that form the true surface of the electrode. In this paper, the lithiation of SiO2-coated Si is studied in a controlled manner using SiO2 coatings of different thicknesses grown on Si wafers via thermal oxidation. SiO2 thickness has a profound effect on lithiation: below 2 nm, SEI formation followed by uniform lithiation occurs at positive voltages versus Li/Li+. Si lithiation is reversible, and SiO2 lithiation is largely irreversible. Above 2 nm SiO2, voltammetric currents decrease exponentially with SiO2 thickness. For 2-3 nm SiO2, SEI formation above 0.1 V is suppressed, but a hold at low or negative voltages can initiate charge transfer whereupon SEI formation and uniform lithiation occur. Cycling of Si anodes with an SiO2 coating thinner than 3 nm occurs at high Coulombic efficiency (CE). If an SiO2 coating is thicker than 3-4 nm, the behavior is totally different: lithiation at positive voltages is strongly inhibited, and lithiation occurs at poor CE and is highly localized at pinholes which grow over time. As they grow, lithiation becomes more facile and the CE increases. Pinhole growth is proposed to occur via rapid transport of Li along the SiO2/Si interface radially outward from an existing pinhole, followed by the lithiation of SiO2 from the interface outward.
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Affiliation(s)
- Manuel Schnabel
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Steven P Harvey
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Elisabetta Arca
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
- Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720, United States
| | - Caleb Stetson
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Glenn Teeter
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Chunmei Ban
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Paul Stradins
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
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11
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Yin Y, Arca E, Wang L, Yang G, Schnabel M, Cao L, Xiao C, Zhou H, Liu P, Nanda J, Teeter G, Eichhorn B, Xu K, Burrell A, Ban C. Nonpassivated Silicon Anode Surface. ACS Appl Mater Interfaces 2020; 12:26593-26600. [PMID: 32412232 DOI: 10.1021/acsami.0c03799] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A stable solid electrolyte interphase (SEI) has been proven to be a key enabler to most advanced battery chemistries, where the reactivity between the electrolyte and the anode operating beyond the electrolyte stability limits must be kinetically suppressed by such SEIs. The graphite anode used in state-of-the-art Li-ion batteries presents the most representative SEI example. Because of similar operation potentials between graphite and silicon (Si), a similar passivation mechanism has been thought to apply on the Si anode when using the same carbonate-based electrolytes. In this work, we found that the chemical formation process of a proto-SEI on Si is closely entangled with incessant SEI decomposition, detachment, and reparation, which lead to continuous lithium consumption. Using a special galvanostatic protocol designed to observe the SEI formation prior to Si lithiation, we were able to deconvolute the electrochemical formation of such dynamic SEI from the morphology and mechanical complexities of Si and showed that a pristine Si anode could not be fully passivated in carbonate-based electrolytes.
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Affiliation(s)
- Yanli Yin
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Elisabetta Arca
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Luning Wang
- University of Maryland, College Park, Maryland 20742, United States
| | - Guang Yang
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Manuel Schnabel
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Lei Cao
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Chuanxiao Xiao
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Hongyao Zhou
- University of California San Diego, San Diego, California 92093-0021, United States
| | - Ping Liu
- University of California San Diego, San Diego, California 92093-0021, United States
| | - Jagjit Nanda
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Glenn Teeter
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Bryan Eichhorn
- University of Maryland, College Park, Maryland 20742, United States
| | - Kang Xu
- Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Anthony Burrell
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Chunmei Ban
- University of Colorado Boulder, Boulder, Colorado 80309, United States
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Huang J, Ban C, Liu L, Ye Y. Dynamics and risk indicators of intrasinus elevation height following transalveolar sinus floor elevation with immediate implant placement: a longitudinal cohort study. Int J Oral Maxillofac Surg 2020; 50:109-115. [PMID: 32507405 DOI: 10.1016/j.ijom.2020.04.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 02/19/2020] [Accepted: 04/30/2020] [Indexed: 12/11/2022]
Abstract
Successful intrasinus graft consolidation is essential for the treatment outcome of transalveolar sinus floor elevation (SFE). This study was performed to examine the dynamics and risk indicators related to the elevation height after transalveolar SFE with grafting material and simultaneous implant placement. Fifty-two patients with 55 sites undergoing transalveolar SFE with immediate implant placement were enrolled retrospectively. Cone beam computed tomography (CBCT) images were collected and saved in DICOM format, at the following time-points: pre-surgery (T0), immediately post-surgery (T1), and 6 months post-surgery (T2). Voxel-based CBCT superimposition was performed to measure the sinus width, residual alveolar height, implant protrusion length, total elevation height, and apical graft height. The change in total elevation height from T1 to T2 was defined as the study outcome. Clinical and linear variables were analysed using linear regression. From T1 to T2, the total elevation height showed an average reduction of 1.0±1.1mm, while 10.9% sites showed an increased elevation height. Univariate regression analysis showed no significant correlation between tested clinical or linear variables and the study outcome. The results suggest that the change in elevation height was not influenced by the alveolar or sinus dimensions, graft materials, implant diameter, implant protrusion length, or the total elevation height at T1.
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Affiliation(s)
- J Huang
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China
| | - C Ban
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China
| | - L Liu
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China
| | - Y Ye
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China.
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Tang X, Yu J, Li M, Zhan D, Shi C, Fang L, Ban C, Zheng W, Veeraraghavan V, Mohan S. Inhibitory effects of triterpenoid betulin on inflammatory mediators inducible nitric oxide synthase, cyclooxygenase-2, tumor necrosis factor-alpha, interleukin-6, and proliferating cell nuclear antigen in 1,2-dimethylhydrazine-induced rat colon carcinogenesis. Pharmacogn Mag 2020. [DOI: 10.4103/pm.pm_516_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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14
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Finegan DP, Vamvakeros A, Cao L, Tan C, Heenan TMM, Daemi SR, Jacques SDM, Beale AM, Di Michiel M, Smith K, Brett DJL, Shearing PR, Ban C. Spatially Resolving Lithiation in Silicon-Graphite Composite Electrodes via in Situ High-Energy X-ray Diffraction Computed Tomography. Nano Lett 2019; 19:3811-3820. [PMID: 31082246 DOI: 10.1021/acs.nanolett.9b00955] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Optimizing the chemical and morphological parameters of lithium-ion (Li-ion) electrodes is extremely challenging, due in part to the absence of techniques to construct spatial and temporal descriptions of chemical and morphological heterogeneities. We present the first demonstration of combined high-speed X-ray diffraction (XRD) and XRD computed tomography (XRD-CT) to probe, in 3D, crystallographic heterogeneities within Li-ion electrodes with a spatial resolution of 1 μm. The local charge-transfer mechanism within and between individual particles was investigated in a silicon(Si)-graphite composite electrode. High-speed XRD revealed charge balancing kinetics between the graphite and Si during the minutes following the transition from operation to open circuit. Subparticle lithiation heterogeneities in both Si and graphite were observed using XRD-CT, where the core and shell structures were segmented, and their respective diffraction patterns were characterized.
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Affiliation(s)
- Donal P Finegan
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
| | - Antonis Vamvakeros
- ESRF, The European Synchrotron , 71 Avenue des Martyrs , 38000 Grenoble , France
- Finden Limited , Merchant House , 5 East Saint Helens Street , Abingdon , OX14 5EG United Kingdom
| | - Lei Cao
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
| | - Chun Tan
- Electrochemical Innovation Laboratory, Department of Chemical Engineering , University College London , London , WC1E 7JE United Kingdom
- The Faraday Institution, Quad One , Harwell Science and Innovation Campus , Didcot , OX11 0RA United Kingdom
| | - Thomas M M Heenan
- Electrochemical Innovation Laboratory, Department of Chemical Engineering , University College London , London , WC1E 7JE United Kingdom
- The Faraday Institution, Quad One , Harwell Science and Innovation Campus , Didcot , OX11 0RA United Kingdom
| | - Sohrab R Daemi
- Electrochemical Innovation Laboratory, Department of Chemical Engineering , University College London , London , WC1E 7JE United Kingdom
| | - Simon D M Jacques
- Finden Limited , Merchant House , 5 East Saint Helens Street , Abingdon , OX14 5EG United Kingdom
| | - Andrew M Beale
- Finden Limited , Merchant House , 5 East Saint Helens Street , Abingdon , OX14 5EG United Kingdom
- Department of Chemistry, 20 Gordon Street , University College London , London , WC1H 0AJ United Kingdom
- Research Complex at Harwell, Harwell Science and Innovation Campus , Rutherford Appleton Laboratories , Harwell, Didcot , Oxon , OX11 0FA United Kingdom
| | - Marco Di Michiel
- ESRF, The European Synchrotron , 71 Avenue des Martyrs , 38000 Grenoble , France
| | - Kandler Smith
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
| | - Dan J L Brett
- Electrochemical Innovation Laboratory, Department of Chemical Engineering , University College London , London , WC1E 7JE United Kingdom
- The Faraday Institution, Quad One , Harwell Science and Innovation Campus , Didcot , OX11 0RA United Kingdom
| | - Paul R Shearing
- Electrochemical Innovation Laboratory, Department of Chemical Engineering , University College London , London , WC1E 7JE United Kingdom
- The Faraday Institution, Quad One , Harwell Science and Innovation Campus , Didcot , OX11 0RA United Kingdom
| | - Chunmei Ban
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
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Son S, Cao L, Yoon T, Cresce A, Hafner SE, Liu J, Groner M, Xu K, Ban C. Interfacially Induced Cascading Failure in Graphite-Silicon Composite Anodes. Adv Sci (Weinh) 2019; 6:1801007. [PMID: 30775222 PMCID: PMC6364491 DOI: 10.1002/advs.201801007] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 08/15/2018] [Indexed: 05/12/2023]
Abstract
Silicon (Si) has been well recognized as a promising candidate to replace graphite because of its earth abundance and high-capacity storage, but its large volume changes upon lithiation/delithiation and the consequential material fracturing, loss of electrical contact, and over-consumption of the electrolyte prevent its full application. As a countermeasure for rapid capacity decay, a composite electrode of graphite and Si has been adopted by accommodating Si nanoparticles in a graphite matrix. Such an approach, which involves two materials that interact electrochemically with lithium in the electrode, necessitates an analytical methodology to determine the individual electrochemical behavior of each active material. In this work, a methodology comprising differential plots and integral calculus is established to analyze the complicated interplay among the two active batteries and investigate the failure mechanism underlying capacity fade in the blend electrode. To address performance deficiencies identified by this methodology, an aluminum alkoxide (alucone) surface-modification strategy is demonstrated to stabilize the structure and electrochemical performance of the graphite-Si composite electrode. The integrated approach established in this work is of great importance to the design and diagnostics of a multi-component composite electrode, which is expected to be high interest to other next-generation battery system.
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Affiliation(s)
- Seoung‐Bum Son
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
- Department of Material Science and EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
| | - Lei Cao
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Taeho Yoon
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
- School of Chemical EngineeringYeungnam UniversityGyeongsan38541Republic of Korea
| | - Arthur Cresce
- Department of Material Science and EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
- Electrochemistry BranchSensor and Electron Devices DirectorateU.S. Army Research LaboratoryAdelphiMD20783‐1197USA
| | - Simon E. Hafner
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
- Department of Mechanical EngineeringUniversity of Colorado596 UCBBoulderCO80309USA
| | - Jun Liu
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Markus Groner
- ALD NanoSolutions580 Burbank Street, Unit 100BroomfieldCO80020USA
| | - Kang Xu
- Department of Material Science and EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
- Electrochemistry BranchSensor and Electron Devices DirectorateU.S. Army Research LaboratoryAdelphiMD20783‐1197USA
| | - Chunmei Ban
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
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Tian XZ, Paengkoum P, Paengkoum S, Chumpawadee S, Ban C, Thongpea S. Short communication: Purple corn (Zea mays L.) stover silage with abundant anthocyanins transferring anthocyanin composition to the milk and increasing antioxidant status of lactating dairy goats. J Dairy Sci 2018; 102:413-418. [PMID: 30415857 DOI: 10.3168/jds.2018-15423] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Accepted: 09/22/2018] [Indexed: 12/13/2022]
Abstract
The present study used 16 multiparous lactating Saanen dairy goats (body weight, 41.80 ± 2.92 kg; mean ± standard deviation) with healthy and symmetrical udders. Goats were divided into 2 blocks of 8 goats based on milk yield averaged from 75 d in milk in a randomized completed block design. The 2 study groups were the control (CSSS), in which goats were fed sticky corn stover silage, and the treatment (TPSS), in which goats were fed anthocyanin-rich purple corn (Zea mays L.) stover silage (PSS). The results indicated that the TPSS group led to an elevation in the content of milk lactose relative to the CSSS. The inclusion of anthocyanin-rich PSS had no effect on the level of 5 particular anthocyanins [i.e., cyanidin-3-glucoside, delphinidin, cyanidin, pelargonidin (Pel), as well as total anthocyanins in milk]. The pelargonidin-3-glucoside and malvidin were unable to be detected in both groups. However, the TPSS resulted in higher levels of peonidin (Peo) and malvidin-3-O-glucoside (M3G) compared with the control. Moreover, goats receiving TPSS exhibited a higher level of superoxide dismutase (SOD) in plasma and milk relative to the CSSS. Interestingly, some positive correlations were detected between the certain milk components [i.e., fat and total solids as well as fat and solids-not-fat (SNF); protein and SNF; and total solids and SNF]. In addition, the positive correlations were observed between individual anthocyanins (cyanidin-3-glucoside, delphinidin, Peo, M3G, cyanidin, and Pel) and total anthocyanins. Specifically, stronger positive correlations were noted between several antioxidant enzymes and anthocyanin composition in milk (total antioxidant capacity and Pel; SOD and Peo as well as SOD and M3G). Taken together, PSS with abundant anthocyanins can transfer anthocyanins to the milk and enhance the amount of antioxidants in lactating dairy goats.
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Affiliation(s)
- X Z Tian
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand
| | - P Paengkoum
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand.
| | - S Paengkoum
- Program in Agriculture, Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Muang, Nakhon Ratchasima 30000, Thailand
| | - S Chumpawadee
- Department of Agricultural Technology, Faculty of Technology, Mahasarakham University, Bangkok 44150, Thailand
| | - C Ban
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand
| | - S Thongpea
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand
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Son SB, Gao T, Harvey SP, Steirer KX, Stokes A, Norman A, Wang C, Cresce A, Xu K, Ban C. An artificial interphase enables reversible magnesium chemistry in carbonate electrolytes. Nat Chem 2018; 10:532-539. [DOI: 10.1038/s41557-018-0019-6] [Citation(s) in RCA: 231] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 02/01/2018] [Indexed: 12/24/2022]
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Son SB, Wang Y, Xu J, Li X, Groner M, Stokes A, Yang Y, Cheng YT, Ban C. Systematic Investigation of the Alucone-Coating Enhancement on Silicon Anodes. ACS Appl Mater Interfaces 2017; 9:40143-40150. [PMID: 28948765 DOI: 10.1021/acsami.7b08960] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Polyvinylidene fluoride (PVDF) is the most popular binder in commercial lithium-ion batteries but is incompatible with a silicon (Si) anode because it fails to maintain the mechanical integrity of the Si electrode upon cycling. Herein, an alucone coating synthesized by molecular layer deposition has been applied on the laminated electrode fabricated with PVDF to systematically study the sole impact of the surface modification on the electrochemical and mechanical properties of the Si electrode, without the interference of other functional polymer binders. The enhanced mechanical properties of the coated electrodes, confirmed by mechanical characterization, can help accommodate the repeated volume fluctuations, preserve the electrode structure during electrochemical reactions, and thereby, leading to a remarkable improvement of the electrochemical performance. Owing to the alucone coating, the Si electrodes achieve highly reversible cycling performance with a specific capacity of 1490 mA h g-1 (0.90 mA h cm-2) as compared to 550 mA h g-1 (0.19 mA h cm-2) observed in the uncoated Si electrode. This research elucidates the important role of surface modification in stabilizing the cycling performance and enabling a high level of material utilization at high mass loading. It also provides insights for the future development of Si anodes.
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Affiliation(s)
- Seoung-Bum Son
- National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, Unites States
| | - Yikai Wang
- Department of Chemical and Materials Engineering, University of Kentucky , Lexington, Kentucky 40506, United States
| | - Jiagang Xu
- Department of Chemical and Materials Engineering, University of Kentucky , Lexington, Kentucky 40506, United States
| | - Xuemin Li
- National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, Unites States
- Department of Chemistry, Colorado School of Mines , 1012 14th Street, Golden, Colorado 80401, United States
| | - Markus Groner
- ALD NanoSolution , 580 Burbank Street, Unit 100, Broomfield, Colorado 80020, United States
| | - Adam Stokes
- Department of Materials Science, Colorado School of Mines , 1600 Illinois Street, Golden, Colorado 80401, United States
| | - Yongan Yang
- Department of Chemistry, Colorado School of Mines , 1012 14th Street, Golden, Colorado 80401, United States
| | - Yang-Tse Cheng
- Department of Chemical and Materials Engineering, University of Kentucky , Lexington, Kentucky 40506, United States
| | - Chunmei Ban
- National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, Unites States
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Evans T, Piper DM, Sun H, Porcelli T, Kim SC, Han SS, Choi YS, Tian C, Nordlund D, Doeff MM, Ban C, Cho SJ, Oh KH, Lee SH. In Situ Engineering of the Electrode-Electrolyte Interface for Stabilized Overlithiated Cathodes. Adv Mater 2017; 29:1604549. [PMID: 28054387 DOI: 10.1002/adma.201604549] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 12/01/2016] [Indexed: 06/06/2023]
Abstract
The first-ever demonstration of stabilized Si/lithium-manganese-rich full cells, capable of retaining >90% energy over early cycling and >90% capacity over more than 750 cycles at the 1C rate (100% depth-of-discharge), is made through the utilization of a modified ionic-liquid electrolyte capable of forming a favorable cathode-electrolyte interface.
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Affiliation(s)
- Tyler Evans
- Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, 80309, USA
- SiILion, Inc., Broomfield, CO, 80020, USA
| | | | - Huaxing Sun
- Department of Chemistry, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Timothy Porcelli
- Department of Chemistry, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Seul Cham Kim
- Department of Material Science and Engineering, Seoul National University, Seoul, 151-742, South Korea
| | - Sang Sub Han
- Department of Material Science and Engineering, Seoul National University, Seoul, 151-742, South Korea
| | - Yong Seok Choi
- Department of Material Science and Engineering, Seoul National University, Seoul, 151-742, South Korea
| | - Chixia Tian
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Marca M Doeff
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Chunmei Ban
- Center of Chemical and Materials Science, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Sung-Jin Cho
- Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, Greensboro, NC, 27411, USA
| | - Kyu Hwan Oh
- Department of Material Science and Engineering, Seoul National University, Seoul, 151-742, South Korea
| | - Se-Hee Lee
- Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, 80309, USA
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Li X, Wolden CA, Ban C, Yang Y. Facile Synthesis of Lithium Sulfide Nanocrystals for Use in Advanced Rechargeable Batteries. ACS Appl Mater Interfaces 2015; 7:28444-28451. [PMID: 26633238 DOI: 10.1021/acsami.5b09367] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work reports a new method of synthesizing anhydrous lithium sulfide (Li2S) nanocrystals and demonstrates their potential as cathode materials for advanced rechargeable batteries. Li2S is synthesized by reacting hydrogen sulfide (H2S) with lithium naphthalenide (Li-NAP), a thermodynamically spontaneous reaction that proceeds to completion rapidly at ambient temperature and pressure. The process completely removes H2S, a major industrial waste, while cogenerating 1,4-dihydronaphthalene, itself a value-added chemical that can be used as liquid fuel. The phase purity, morphology, and homogeneity of the resulting nanopowders were confirmed by X-ray diffraction and scanning electron microscopy. The synthesized Li2S nanoparticles (100 nm) were assembled into cathodes, and their performance was compared to that of cathodes fabricated using commercial Li2S micropowders (1-5 μm). Electrochemical analyses demonstrated that the synthesized Li2S were superior in terms of (dis)charge capacity, cycling stability, output voltage, and voltage efficiency.
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Affiliation(s)
- Xuemin Li
- Department of Chemistry, Colorado School of Mines , 1012 14th Street, Golden, Colorado 80401, United States
| | - Colin A Wolden
- Department of Chemical and Biological Engineering, Colorado School of Mines , 1613 Illinois Street, Golden, Colorado 80401, United States
| | - Chunmei Ban
- National Renewable Energy Laboratory , 1617 Cole Boulevard, Golden, Colorado 80401, United States
| | - Yongan Yang
- Department of Chemistry, Colorado School of Mines , 1012 14th Street, Golden, Colorado 80401, United States
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Li Z, Wang Y, Hu Q, Yang Y, Wu Z, Ban C. Improved Electrochemical Performance of Carbon-Coated LiFeBO3 Nanoparticles for Lithium-Ion Batteries. J Nanosci Nanotechnol 2015; 15:7186-7190. [PMID: 26716308 DOI: 10.1166/jnn.2015.10555] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Carbon-coated LiFeBO3 nanoparticles have been successfully prepared by surfactant-assisted ball milling and a size selection process based on centrifugal separation. Monodispersed LiFeBO3 nanoparticles with dimensions of 10-20 nm are observed by transmission electron microscope. The introduced surfactant acts as the dispersant as well as the carbon source for LiFeBO3 nanoparticles. Greatly improved discharge capacities of 190.4 mA h g(-1) at 0.1 C and 106.6 mA h g(-1) at 1 C rate have been achieved in the LiFeBO3 nanoparticles when cycling the cells between 1.0 V and 4.8 V. Meanwhile, the as-prepared micro-size LiFeBO3 electrodes show lower discharge capacities of 142 mA h g(-1) and 93.3 mA h g(-1) at 0.1 C and 1 C rates. The post-treated LiFeBO3 nanostructure has drastically enhanced the electrochemical performance due to the short diffusion length and ameliorated electrical contract between LiFeBO3 nano particles.
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Ma Y, Martinez de la Hoz JM, Angarita I, Berrio-Sanchez JM, Benitez L, Seminario JM, Son SB, Lee SH, George SM, Ban C, Balbuena PB. Structure and Reactivity of Alucone-Coated Films on Si and Li(x)Si(y) Surfaces. ACS Appl Mater Interfaces 2015; 7:11948-11955. [PMID: 25985821 DOI: 10.1021/acsami.5b01917] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Coating silicon particles with a suitable thin film has appeared as a possible solution to accommodate the swelling of silicon upon lithiation and its posterior cracking and pulverization during cycling of Li-ion batteries. In particular, aluminum alkoxide (alucone) films have been recently deposited over Si anodes, and the lithiation and electrochemical behavior of the system have been characterized. However, some questions remain regarding the lithium molecular migration mechanisms through the film and the electronic properties of the alucone film. Here we use density functional theory, ab initio molecular dynamics simulations, and Green's function theory to examine the film formation, lithiation, and reactivity in contact with an electrolyte solution. It is found that the film is composed of Al-O complexes with 3-O or 4-O coordination. During lithiation, Li atoms bind very strongly to the O atoms in the most energetically favorable sites. After the film is irreversibly saturated with Li atoms, it becomes electronically conductive. The ethylene carbonate molecules in liquid phase are found to be reduced at the surface of the Li-saturated alucone film following similar electron transfer mechanisms as found previously for lithiated silicon anodes. The theoretical results are in agreement with those from morphology and electrochemical analyses.
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Affiliation(s)
| | | | | | | | | | | | - Seoung-Bum Son
- ∥National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, United States
| | - Se-Hee Lee
- ⊥University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Steven M George
- ⊥University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Chunmei Ban
- ∥National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, United States
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Luo L, Yang H, Yan P, Travis JJ, Lee Y, Liu N, Piper DM, Lee SH, Zhao P, George SM, Zhang JG, Cui Y, Zhang S, Ban C, Wang CM. Surface-coating regulated lithiation kinetics and degradation in silicon nanowires for lithium ion battery. ACS Nano 2015; 9:5559-66. [PMID: 25893684 DOI: 10.1021/acsnano.5b01681] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Silicon (Si)-based materials hold promise as the next-generation anodes for high-energy lithium (Li)-ion batteries. Enormous research efforts have been undertaken to mitigate the chemo-mechanical failure due to the large volume changes of Si during lithiation and delithiation cycles. It has been found that nanostructured Si coated with carbon or other functional materials can lead to significantly improved cyclability. However, the underlying mechanism and comparative performance of different coatings remain poorly understood. Herein, using in situ transmission electron microscopy (TEM) through a nanoscale half-cell battery, in combination with chemo-mechanical simulation, we explored the effect of thin (∼5 nm) alucone and Al2O3 coatings on the lithiation kinetics of Si nanowires (SiNWs). We observed that the alucone coating leads to a "V-shaped" lithiation front of the SiNWs, while the Al2O3 coating yields an "H-shaped" lithiation front. These observations indicate that the difference between the Li surface diffusivity and bulk lithiation rate of the coatings dictates lithiation induced morphological evolution in the nanowires. Our experiments also indicate that the reaction rate in the coating layer can be the limiting step for lithiation and therefore critically influences the rate performance of the battery. Further, the failure mechanism of the Al2O3 coated SiNWs was also explored. Our studies shed light on the design of high capacity, high rate and long cycle life Li-ion batteries.
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Affiliation(s)
- Langli Luo
- †Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States
| | - Hui Yang
- ‡Engineering Science and Mechanics and Bioengineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Pengfei Yan
- †Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States
| | - Jonathan J Travis
- §University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Younghee Lee
- §University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Nian Liu
- ∥Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | | | - Se-Hee Lee
- §University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Peng Zhao
- ‡Engineering Science and Mechanics and Bioengineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Steven M George
- §University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Ji-Guang Zhang
- ⊥Energy and Environmental Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States
| | - Yi Cui
- ∥Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
- #Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Sulin Zhang
- ‡Engineering Science and Mechanics and Bioengineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Chunmei Ban
- ∇National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, United States
| | - Chong-Min Wang
- †Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States
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He Y, Piper DM, Gu M, Travis JJ, George SM, Lee SH, Genc A, Pullan L, Liu J, Mao SX, Zhang JG, Ban C, Wang C. In situ transmission electron microscopy probing of native oxide and artificial layers on silicon nanoparticles for lithium ion batteries. ACS Nano 2014; 8:11816-23. [PMID: 25347792 DOI: 10.1021/nn505523c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Surface modification of silicon nanoparticles via molecular layer deposition (MLD) has been recently proved to be an effective way for dramatically enhancing the cyclic performance in lithium ion batteries. However, the fundamental mechanism of how this thin layer of coating functions is not known, which is complicated by the inevitable presence of native oxide of several nanometers on the silicon nanoparticle. Using in situ TEM, we probed in detail the structural and chemical evolution of both uncoated and coated silicon particles upon cyclic lithiation/delithation. We discovered that upon initial lithiation, the native oxide layer converts to crystalline Li2O islands, which essentially increases the impedance on the particle, resulting in ineffective lithiation/delithiation and therefore low Coulombic efficiency. In contrast, the alucone MLD-coated particles show extremely fast, thorough, and highly reversible lithiation behaviors, which are clarified to be associated with the mechanical flexibility and fast Li(+)/e(-) conductivity of the alucone coating. Surprisingly, the alucone MLD coating process chemically changes the silicon surface, essentially removing the native oxide layer, and therefore mitigates side reactions and detrimental effects of the native oxide. This study provides a vivid picture of how the MLD coating works to enhance the Coulombic efficiency, preserves capacity, and clarifies the role of the native oxide on silicon nanoparticles during cyclic lithiation and delithiation. More broadly, this work also demonstrates that the effect of the subtle chemical modification of the surface during the coating process may be of equal importance to the coating layer itself.
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Affiliation(s)
- Yang He
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory , 902 Battelle Boulevard, Richland, Washington 99352, United States
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Piper DM, Travis JJ, Young M, Son SB, Kim SC, Oh KH, George SM, Ban C, Lee SH. Reversible high-capacity Si nanocomposite anodes for lithium-ion batteries enabled by molecular layer deposition. Adv Mater 2014; 26:1596-1601. [PMID: 24353043 DOI: 10.1002/adma.201304714] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 11/04/2013] [Indexed: 06/03/2023]
Abstract
The molecular-layer deposition of a flexible coating onto Si electrodes produces high-capacity Si nanocomposite anodes. Using a reaction cascade based on inorganic trimethylaluminum and organic glycerol precursors, conventional nano-Si electrodes undergo surface modifications, resulting in anodes that can be cycled over 100 times with capacities of nearly 900 mA h g(-1) and Coulombic efficiencies in excess of 99%.
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Affiliation(s)
- Daniela Molina Piper
- Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, 80309, USA; National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO, 80401, USA
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27
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Ban C, Xie M, Sun X, Travis JJ, Wang G, Sun H, Dillon AC, Lian J, George SM. Atomic layer deposition of amorphous TiO2 on graphene as an anode for Li-ion batteries. Nanotechnology 2013; 24:424002. [PMID: 24067324 DOI: 10.1088/0957-4484/24/42/424002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Atomic layer deposition (ALD) was used to deposit TiO2 anode material on high surface area graphene (reduced graphene oxide) sheets for Li-ion batteries. An Al2O3 ALD ultrathin layer was used as an adhesion layer for conformal deposition of the TiO2 ALD films at 120 ° C onto the conducting graphene sheets. The TiO2 ALD films on the Al2O3 ALD adhesion layer were nearly amorphous and conformal to the graphene sheets. These nanoscale TiO2 coatings minimized the effect of the low diffusion coefficient of lithium ions in bulk TiO2. The TiO2 ALD films exhibited stable capacities of ~120 mAh g(-1) and ~100 mAh g(-1) at high cycling rates of 1 A g(-1) and 2 A g(-1), respectively. The TiO2 ALD films also displayed excellent cycling stability with ~95% of the initial capacity remaining after 500 cycles. These results illustrate that ALD can provide a useful method to deposit electrode materials on high surface area substrates for Li-ion batteries.
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Affiliation(s)
- Chunmei Ban
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA
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28
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Xu Q, Ban C, Dillon AC, Wei SH, Zhao Y. First-Principles Study of Lithium Borocarbide as a Cathode Material for Rechargeable Li ion Batteries. J Phys Chem Lett 2011; 2:1129-1132. [PMID: 26295314 DOI: 10.1021/jz200440m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Computational simulations within density functional theory are performed to investigate the potential application of a lithium borocarbide (LiBC) compound as a unique material for lithium ion batteries. The graphene-like BC sheets are predicted to be Li(+) intercalation hosts with the Li ion capacity surprisingly surpassing that of graphite. Here, the layered LixBC structure is preserved with x ≥ 0.5, indicating that half of the Li ions in the LiBC compound are rechargeable. Furthermore, the intercalation potential (equilibrium lithium-insertion voltage of 2.3-2.4 V relative to lithium metal) is significantly higher than that in graphite, allowing Li0.5BC to function as a cathode material. The reversible electrochemical reaction, LiBC ⇌ Li0.5BC + 0.5Li, enables a specific energy density of 1088 W h/kg and a volumetric energy density of 2463 W h/L. The volume change is less than 3% during the charging and discharging process. This discovery could lead to the development of a unique high-capacity LiBC Li ion cathode material.
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Affiliation(s)
- Qiang Xu
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Chunmei Ban
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Anne C Dillon
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Su-Huai Wei
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Yufeng Zhao
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
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29
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Ban C, Wu Z, Gillaspie DT, Chen L, Yan Y, Blackburn JL, Dillon AC. Nanostructured Fe(3)O(4)/SWNT electrode: Binder-free and high-rate li-ion anode. Adv Mater 2010; 22:E145-E149. [PMID: 20440701 DOI: 10.1002/adma.200904285] [Citation(s) in RCA: 208] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Chunmei Ban
- Materials and Chemical Science Center, Golden, Colorado 80401, USA
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31
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Kim T, Ban C. Structural basis on small MutS-related domain of human BCL-3 binding protein. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308088016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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32
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Wahl MC, Ramakrishnan B, Ban C, Chen X, Sundaralingam M. RNA - synthesis, purification and crystallization. Acta Crystallogr D Biol Crystallogr 2005; 52:668-75. [PMID: 15299630 DOI: 10.1107/s0907444996002788] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Protocols for the routine chemical synthesis and purification of milligram quantities of RNA and DNA-RNA chimeras meeting the demands of X-ray crystallography are described. An efficient screening protocol to test the crystallizability of the molecules and the optimization of the crystallization conditions are presented, so as to allow reproduction by others. Essentially the same crystallization conditions as for DNA oligomers can be employed for RNA crystallization. Specific examples involving alternating octamers, G/C-rich decamers, sequences with overhangs, and drug complexes of chimeras are discussed. Success of the methods is attested by the crystals obtained which diffract to high resolution.
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Affiliation(s)
- M C Wahl
- The Ohio State University, Laboratory of Biological Macromolecular Structure, Department of Biochemistry, Columbus 43210-1002, USA
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33
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Affiliation(s)
- W Yang
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland 20892, USA
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Watanabe Y, Mitomo M, Tokuda Y, Yoshida K, Choi S, Hosoki T, Ban C. Eclamptic encephalopathy: MRI, including diffusion-weighted images. Neuroradiology 2002; 44:981-5. [PMID: 12483442 DOI: 10.1007/s00234-002-0867-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2002] [Accepted: 07/22/2002] [Indexed: 11/24/2022]
Abstract
Eclampsia is a rare condition peculiar to pregnant and puerperal women. We analyse imaging features in five patients with eclampsia, and determine whether diffusion-weighted imaging (DWI) could differentiate cytotoxic and vasogenic oedema in four of them. All were imaged within 4 days of the onset of symptoms. We found lesions with a prolonged T2 in the brain of all five patients, in the basal ganglia in four, pons in three and posterior cerebral white matter in two. Isotropic DWI revealed variable intensity in these regions. The ADC was decreased in one, and increased in all the others. The lesion with reduced ADC progressed to infarction.
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Affiliation(s)
- Y Watanabe
- Department of Radiology, Osaka National Hospital, 2-1-14 Hoenzaka Chuo-ku, Osaka 540-0006, Japan.
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35
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Pop I, Ban C, Stepan E, Roiu G. [Incidence of ocular trauma in Clinical Hospital Oradea between 1997-1999]. Oftalmologia 2002; 52:85-9. [PMID: 11771109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The purpose of the study is to analyse the great number of ocular injuries which were diagnosed and treated in the out-patients clinic or in the hospital in 1997-1999. Ocular trauma seems to be related to the working place or the main activities of the patients, such as agriculture or housekeeping. Ocular injuries in children are significant as number and prognosis. Blunt trauma, ocular perforations, ocular foreign bodies and burns were studied separately for children, housekeepers, unemployed, working and retired people. Due to their number and complexity, ocular trauma represent a very important part in the activity of an ophthalmology department. The conclusion of the study is the number of ocular injuries decreased over the years because of the reduced industrial activity in our town. Similar ocular injuries in retired and working people suggest that retired people are still active. The prognosis of ocular trauma is better if the patients come early to be seen by the specialist, if the treatment is adequate and if the department has a proper equipment for advanced surgery techniques.
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Pop I, Ban C, Hanciu D, Petroi C. [A myopia study of glaucoma patients following pilocarpine instillation]. Oftalmologia 2001; 52:44-8. [PMID: 11021139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
AIM Our research studies transitory myopia induced by Pilocarpine treatment in glaucoma patients. MATERIAL AND METHODS 48 patients with open angle glaucoma were selected, visual acuity and refraction were measured before and after the instillation of Pilocarpine 2%, for two hours. Induced myopia was compared for different ages and it was established the influence of Timolol and Acetazolamide administered in the same time. RESULTS Transitory myopia is important in young patients, reduced after 50 years and absent after 70 years. Acetazolamide increases myopia, Timolol has no effect on refraction. CONCLUSIONS The study confirms the unpleasant effect of Pilocarpine and suggests not performing refractometry in the first two hours after the instillation of the drug.
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Affiliation(s)
- I Pop
- Spitalul Clinic de Oftalmologie, Oradea
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37
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Abstract
DNA mismatch repair is critical for increasing replication fidelity in organisms ranging from bacteria to humans. MutS protein, a member of the ABC ATPase superfamily, recognizes mispaired and unpaired bases in duplex DNA and initiates mismatch repair. Mutations in human MutS genes cause a predisposition to hereditary nonpolyposis colorectal cancer as well as sporadic tumours. Here we report the crystal structures of a MutS protein and a complex of MutS with a heteroduplex DNA containing an unpaired base. The structures reveal the general architecture of members of the MutS family, an induced-fit mechanism of recognition between four domains of a MutS dimer and a heteroduplex kinked at the mismatch, a composite ATPase active site composed of residues from both MutS subunits, and a transmitter region connecting the mismatch-binding and ATPase domains. The crystal structures also provide a molecular framework for understanding hereditary nonpolyposis colorectal cancer mutations and for postulating testable roles of MutS.
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Affiliation(s)
- G Obmolova
- Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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Biswas I, Ban C, Fleming KG, Qin J, Lary JW, Yphantis DA, Yang W, Hsieh P. Oligomerization of a MutS mismatch repair protein from Thermus aquaticus. J Biol Chem 1999; 274:23673-8. [PMID: 10438551 DOI: 10.1074/jbc.274.33.23673] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The MutS DNA mismatch protein recognizes heteroduplex DNAs containing mispaired or unpaired bases. We have examined the oligomerization of a MutS protein from Thermus aquaticus that binds to heteroduplex DNAs at elevated temperatures. Analytical gel filtration, cross-linking of MutS protein with disuccinimidyl suberate, light scattering, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry establish that the Taq protein is largely a dimer in free solution. Analytical equilibrium sedimentation showed that the oligomerization of Taq MutS involves a dimer-tetramer equilibrium in which dimer predominates at concentrations below 10 microM. The DeltaG(0)(2-4) for the dimer to tetramer transition is approximately -6.9 +/- 0.1 kcal/mol of tetramer. Analytical gel filtration of native complexes and gel mobility shift assays of an maltose-binding protein-MutS fusion protein bound to a short, 37-base pair heteroduplex DNA reveal that the protein binds to DNA as a dimer with no change in oligomerization upon DNA binding.
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Affiliation(s)
- I Biswas
- Genetics and Biochemistry Branch, NIDDK, National Institutes of Health, Bethesda, Maryland 20892, USA
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Abstract
The MutL DNA mismatch repair protein has recently been shown to be an ATPase and to belong to an emerging ATPase superfamily that includes DNA topoisomerase II and Hsp90. We report here the crystal structures of a 40 kDa ATPase fragment of E. coli MutL (LN40) complexed with a substrate analog, ADPnP, and with product ADP. More than 60 residues that are disordered in the apoprotein structure become ordered and contribute to both ADPnP binding and dimerization of LN40. Hydrolysis of ATP, signified by subsequent release of the gamma-phosphate, releases two key loops and leads to dissociation of the LN40 dimer. Dimerization of the LN40 region is required for and is the rate-limiting step in ATP hydrolysis by MutL. The ATPase activity of MutL is stimulated by DNA and likely acts as a switch to coordinate DNA mismatch repair.
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Affiliation(s)
- C Ban
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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40
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Abstract
MutL and its homologs are essential for DNA mismatch repair. Mutations in genes encoding human homologs of MutL cause multiorgan cancer susceptibility. We have determined the crystal structure of a 40 kDa N-terminal fragment of E. coli MutL that retains all of the conserved residues in the MutL family. The structure of MutL is homologous to that of an ATPase-containing fragment of DNA gyrase. We have demonstrated that MutL binds and hydrolyzes ATP to ADP and Pi. Mutations in the MutL family that cause deficiencies in DNA mismatch repair and a predisposition to cancer mainly occur in the putative ATP-binding site. We provide evidence that the flexible, yet conserved, loops surrounding this ATP-binding site undergo conformational changes upon ATP hydrolysis thereby modulating interactions between MutL and other components of the repair machinery.
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Affiliation(s)
- C Ban
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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41
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Zolog I, Chercota V, Ban C. [Pseudophacos explant: the causes and the functional results]. Oftalmologia 1998; 42:14-9. [PMID: 9713195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We've studied a number of 20 cases of pseudophakic explantation performed in the Eye Center Timişoara between 1991-1997 from 2605 pseudophakic implantations. The interval between implantation and the moment of explantation was between 4 days and 7 years. The causes which indicated pseudophakic explantation were: pseudophakic bullous keratopathy, IOL decentration and dislocation, uveitis, persistent secondary glaucoma. The study refers to the established treatment for avoiding the explantation and also to the functional results obtained after pseudophakic explantation. Most of the explanted artificial lens cases were anterior chamber lens--13, all of them ALCON type, also we've explanted 4 pupillary implants Fedorov type. The visual acuities obtained after explantation were between hand movement perception and 10/10. Before surgery, visual acuity was between light perception and 10/10. The best functional results were obtained in pseudophakic decentration and dislocation cases and the worst in pseudophakic bullous keratopathy, uveitis and secondary glaucoma cases.
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Affiliation(s)
- I Zolog
- Clinica de Oftalmologie, Timişoara
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42
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Abstract
MutS, MutL and MutH are the three essential proteins for initiation of methyl-directed DNA mismatch repair to correct mistakes made during DNA replication in Escherichia coli. MutH cleaves a newly synthesized and unmethylated daughter strand 5' to the sequence d(GATC) in a hemi-methylated duplex. Activation of MutH requires the recognition of a DNA mismatch by MutS and MutL. We have crystallized MutH in two space groups and solved the structures at 1.7 and 2.3 A resolution, respectively. The active site of MutH is located at an interface between two subdomains that pivot relative to one another, as revealed by comparison of the crystal structures, and this presumably regulates the nuclease activity. The relative motion of the two subdomains in MutH correlates with the position of a protruding C-terminal helix. This helix appears to act as a molecular lever through which MutS and MutL may communicate the detection of a DNA mismatch and activate MutH. With sequence homology to Sau3AI and structural similarity to PvuII endonuclease, MutH is clearly related to these enzymes by divergent evolution, and this suggests that type II restriction endonucleases evolved from a common ancestor.
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Affiliation(s)
- C Ban
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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43
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Abstract
The crystal structure of the DNA heptamer d(GCGCGCG) has been solved at 1.65 A resolution by the molecular replacement method and refined to an R-value of 0.184 for 3598 reflections. The heptamer forms a Z-DNA d(CGCGCG)2 with 5'-overhang G residues instead of an A-DNA d(GCGCGC)2 with 3'-overhang G residues. The overhang G residues from parallel strands of two adjacent duplexes form a trans reverse Hoogsteen G x G basepair that stacks on the six Z-DNA basepairs to produce a pseudocontinuous helix. The reverse Hoogsteen G x G basepair is unusual in that the displacement of one G base relative to the other allows them to participate in a bifurcated (G1)N2 . . . N7(G8) and an enhanced (G8)C8-H . . . O6(G1) hydrogen bond, in addition to the two usual hydrogen bonds. The 5'-overhang G residues are anti and C2'-endo while the 3'-terminal G residues are syn and C2'-endo. The conformations of both G residues are different from the syn/C3'-endo for the guanosine in a standard Z-DNA. The two cobalt hexammine ions bind to the phosphate groups in both GpC and CpG steps in Z(I) and Z(II) conformations. The water structure motif is similar to the other Z-DNA structures.
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Affiliation(s)
- B Pan
- Biological Macromolecular Structure Center, Department of Chemistry, The Ohio State University, Columbus 43210-1002, USA
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44
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Abstract
The crystal structure of the RNA duplex, r(GUAUGUA)dC, with a 3'-terminal deoxy C residue, has been determined at 1.38 A resolution. The r(GUAUGU) hexameric consensus sequence is present at the exon-intron junction in pre-mRNAs of yeast and higher eukaryotic organisms. The crystal belongs to the rhombohedral space group R3. The hexagonal unit cell dimensions are a = b = 39.71 A, c = 68.15 A and gamma = 120 degrees with one duplex in the asymmetric unit. The structure was solved using the molecular replacement method. The final model contains 332 atoms of the duplex and 67 solvent molecules. The R-factor is 17.6% (Rfree of 23.1%) for 4035 reflections with F > or = 1.5sigma(F) in the resolution range 10.0 to 1.38 A. The duplex is of the A-type with a pseudodyad relating the two strands. The RNA helix is slightly distorted, in spite of the presence of two adjacent G x U wobble base-pairs located at the center of the helix. The twist angle between the wobble pairs, 38.1 degrees, is above the average value and those between the wobble base-pairs and the flanking Watson-Crick base-pairs, 26.7 degrees and 26.3 degrees, respectively, are lower than the average values. The twist between the junction base-pairs are about 24 degrees. The G x U wobble pairs are bridged by water molecules and solvated in the grooves. G x U base-pairs are as stable as the Watson-Crick A x U pairs and only slightly less stable than the G x C pairs accounting for their frequent occurrence in RNA.
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Affiliation(s)
- R Biswas
- Department of Chemistry, Biological Macromolecular Structure Center, The Ohio State University, Columbus 43210, USA
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Abstract
Alternating self-complementary oligonucleotides starting with a 5'-pyrimidine usually form left-handed Z-DNA; however, with a 5'-purine start sequence they form the right-handed A-DNA. Here we report the crystal structure of the decamer d(GCGCGCGCGC) with a 5'-purine start in the Z-DNA form. The decamer crystallizes in the hexagonal space group P6(5)22, unit cell dimensions a = b = 18.08 and c = 43.10 A, with one of the following four dinucleotide diphosphates in the asymmetric unit: d(pGpC)/d(GpCp)/d(pCpG)/d(CpGp). The molecular replacement method, starting with d(pGpC) of the isomorphous Z-DNA hexamer d(araC-dG)3 without the 2'-OH group of arabinose, was used in the structure analysis. The method gave the solution only after the sugar-phosphate conformation of the GpC step was manipulated. The refinement converged to a final R value of 18.6% for 340 unique reflections in the resolution range 8.0-1.9 A. A result of the sequence alternation is the alternation in the nucleotide conformation; guanosine is C3'-endo, syn, and cytidine is C2'-endo, anti. The CpG step phosphodiester conformation is the same as ZI or ZII, whereas that of the GpC step phosphodiester is "intermediate" in the sense that zeta (O3'-P bond) is the same as ZII but alpha (P-O5' bond) is the same as ZI. The duplexes generated from the dinucleotide asymmetric unit are stacked one on top of the other in the crystal to form an infinite pseudocontinuous helix. This renders it a quasi-polymerlike structure that has assumed the Z-DNA conformation further strengthened by the long inner Z-forming stretch d(CG)4. An interesting feature of the structure is the presence of water strings in both the major and the minor grooves. In the minor groove the cytosine carbonyl oxygen atoms of the GpC and CpG steps are cross-bridged by water molecules that are not themselves hydrogen bonded but are enclosed by the water rings in the mouth of the minor groove. In the major groove three independent water molecules form a zigzagging continuous water string that runs throughout the duplex.
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210, USA
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46
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Abstract
The crystal structure of the alternating 5'-purine start decamer d(GCGCGCGCGC) was found to be in the left-handed Z-DNA conformation. Inasmuch as the A.T base pair is known to resist Z-DNA formation, we substituted A.T base pairs in the dyad-related positions of the decamer duplex. The alternating self-complementary decamer d(GCACGCGTGC) crystallizes in a different hexagonal space group, P6(1)22, with very different unit cell dimensions a = b = 38.97 and c = 77.34 A compared with the all-G.C alternating decamer. The A.T-containing decamer has one strand in the asymmetric unit, and because it is isomorphous to some other A-DNA decamers it was considered also to be right-handed. The structure was refined, starting with the atomic coordinates of the A-DNA decamer d(GCGGGCCCGC), by use of 2491 unique reflections out to 1.9-A resolution. The refinement converged to an R value of 18.6% for a total of 202 nucleotide atoms and 32 water molecules. This research further demonstrates that A.T base pairs not only resist the formation of Z-DNA but can also assist the formation of A-DNA by switching the helix handedness when the oligomer starts with a 5'-purine; also, the length of the inner Z-DNA stretch (d(CG)n) is reduced from an octamer to a tetramer. It may be noted that these oligonucleotide properties are in crystals and not necessarily in solutions.
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210, USA
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47
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Wahl MC, Ban C, Sekharudu C, Ramakrishnan B, Sundaralingam M. Structure of the Purine–Pyrimidine Alternating RNA Double Helix, r(GUAUAUA)d(C), with a 3'-Terminal Deoxy Residue. Acta Crystallogr D Biol Crystallogr 1996; 52:655-67. [PMID: 15299629 DOI: 10.1107/s0907444996000248] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The crystal structure of the purine-pyrimidine alternating octameric RNA helix, r(GUAUAUA)d(C), carrying a 3'-terminal deoxycytidine residue, has been determined at 2.2 A resolution. The molecule crystallizes in the rhombohedral space group R3 (hexagonal cell constants: a = b = 43.07,c = 59.36 A;alpha = beta = 90,gamma = 120 degrees )with one duplex in an asymmetric unit. The structure was solved by molecular replacement and refined with 83 and 2/3 solvent molecules and 2/3 sodium ions to a final R factor of 15.6% using 1775 reflections (86%). The duplexes are approximately linear, their global helix axes are inclined by 10 degrees with respect to the 3(2)-screw axes, and they are stacked on top of each other in a head-to-tail fashion. The twist between the junction base pairs of the stacked duplexes is negligible resulting in a discontinuity of the helix backbones and grooves. The sodium ions on the threefold axis play a significant role in the organization of the packing network. The helical parameters, particularly the twist and the roll, of this alternating sequence are in accord with Calladine's rules. Almost all the 2'-hydroxyl groups are involved in specific hydrogen-bonding interactions, either directly to the sugar ring oxygens O4' on the 3' side, or, through water bridges, to the sugars, phosphates, or bases. This hydrogen bonding of the 2'-hydroxyl groups restrains the conformation of the sugar-phosphate backbone and the glycosidic torsion angles of this RNA fragment. The lack of intermolecular packing contacts in the grooves provides a clear picture of the groove solvation.
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Affiliation(s)
- M C Wahl
- The Ohio State University, Laboratory of Biological Macromolecular Structure, Department of Biochemistry, Columbus 43210-1002, USA
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Ban C, Ramakrishnan B, Sundaralingam M. Crystal structure of the highly distorted chimeric decamer r(C)d(CGGCGCCG)r(G).spermine complex--spermine binding to phosphate only and minor groove tertiary base-pairing. Nucleic Acids Res 1994; 22:5466-76. [PMID: 7816639 PMCID: PMC332097 DOI: 10.1093/nar/22.24.5466] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The crystal structure of the self-complementary chimeric decamer duplex r(C)d(CGGCGCCG)r(G), with RNA base pairs at both termini, has been solved at 1.9 A resolution by the molecular replacement method and refined to an R value of 0.145 for 2,314 reflections. The C3'-endo sugar puckers of the terminal riboses apparently drive the entire chimeric duplex into an A-DNA conformation, in contrast to the B-DNA conformation adopted by the all-deoxy decamer of the same sequence. Five symmetry related duplexes encapsulate a spermine molecule which interacts with ten phosphate groups, both directly and through water molecules to form multiple ionic and hydrogen bonding interactions. The spermine interaction severely bends the duplexes by 31 degrees into the major groove at the fourth base pair G(4).C(17), jolts it and slides the 'base plate' into the minor groove. This base pair, together with the adjacent base pair in the top half and the corresponding pseudo two-fold related base pairs in the bottom half, form four minor groove base-paired multiples with the terminal base pairs of two neighboring duplexes.
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210
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Okagaki A, Ban C, Suzuki A, Ozawa M, Sagawa N, Mori T. Calculation of pulsatility index of flow volume independent of vessel diameter and flow profile. Placenta 1994. [DOI: 10.1016/0143-4004(94)90146-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Ban C, Ramakrishnan B, Sundaralingam M. A single 2'-hydroxyl group converts B-DNA to A-DNA. Crystal structure of the DNA-RNA chimeric decamer duplex d(CCGGC)r(G)d(CCGG) with a novel intermolecular G-C base-paired quadruplet. J Mol Biol 1994; 236:275-85. [PMID: 7508984 DOI: 10.1006/jmbi.1994.1134] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We have found that the introduction of a single 2'-hydroxyl group on the sugar-phosphate backbone of the B-DNA decamer d(CCGGCGCCGG) transforms it to A-DNA. Thus, for the first time the X-ray structures of the same sequence have been observed in both the A and B-DNA conformations, permitting a comparison. Crystals of the DNA-RNA chimeric decamer d(CCGGC)r(G)d(CCGG) belong to the orthorhombic space group P2(1)2(1)2(1) with unit cell dimensions a = 25.63 A, b = 45.24 A and c = 47.99 A, and one decamer duplex in the asymmetric unit. The structure was solved by a rigid body search using the coordinates of the isomorphous structure d(CCCGGCCGGG) and refined to an R value of 0.136 using 2753 unique reflections at 1.9 A resolution. The final model contains 406 nucleotide atoms and 61 water molecules. The chimeric duplex exhibits typical A-DNA geometry, with all the sugars in the C(3')-endo puckering and the base-pairs inclined and displaced from the helix axis. The 2'-hydroxyl groups on rG6 and rG16 protrude into the minor groove surface and form different types of hydrogen bonds; that on strand 1 forms an intermolecular hydrogen bond with the furanose ring O(4') of a symmetry-related C1 residue, while that on strand 2 is involved in two water bridges. Crystal packing forces the G4-G17 base-pair in the top half of the duplex to slide significantly into the minor groove compared to the corresponding G7-G14 base-pair in the bottom half, resulting in these base-pairs exhibiting different base stacking and intermolecular interactions. The base G4 of the G4-G17 base-pair forms an unorthodox base "triple", G4*(G10-C11), hydrogen-bonding through its minor groove sites N(2) and N(3) to the minor groove atoms N(2) and O(2) of both bases of the G10-C11 base-pair of a symmetry-related molecule. The base G10 of this triple in turn forms a second similar unorthodox base triple, G10*(G3*C18), with the adjacent base-pair G3-C18 of the duplex, thus G10 is involved in a double triple. On the other hand, in the bottom half of the duplex, the C7-G14 base-pair is involved only in a single similar unorthodox base triple with G20, (C7-G14)*G20, while the adjacent base-pair rG6-C15 is involved in a novel quadruple with C1-G20, (rG6-C15) *(C1-G20), where the latter base-pairs are hydrogen-bonded to each other via the minor groove sites G(N(2))...C(O(2)).(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210
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