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Nguyen D, Wu J, Corrigan P, Li Y. Computational investigation on lipid bilayer disruption induced by amphiphilic Janus nanoparticles: combined effect of Janus balance and charged lipid concentration. NANOSCALE 2023; 15:16112-16130. [PMID: 37753922 DOI: 10.1039/d3nr00403a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/28/2023]
Abstract
Janus nanoparticles (NPs) with charged/hydrophobic compartments have garnered attention for their potential antimicrobial activity. These NPs have been shown to disrupt lipid bilayers in experimental studies, yet the underlying mechanisms of this disruption at the particle-membrane interface remain unclear. To address this knowledge gap, the present study conducts a computational investigation to systematically examine the disruption of lipid bilayers induced by amphiphilic Janus NPs. The focus of this study is on the combined effects of the hydrophobicity of the Janus NP, referred to as the Janus balance, defined as the ratio of hydrophilic to hydrophobic surface coverage, and the concentration of charged phospholipids on the interactions between Janus NPs and lipid bilayers. Computational simulations were conducted using a coarse-grained molecular dynamics (MD) approach. The results of these MD simulations reveal that while the area change of the bilayer increases monotonically with the Janus balance, the effect of charged lipid concentration in the membrane is not easy to be predicted. Specifically, it was found that the concentration of negatively charged lipids is directly proportional to the intensity of membrane disruption. Conversely, positively charged lipids have a negligible effect on membrane defects. This study provides molecular insights into the significant role of Janus balance in the disruption of lipid bilayers by Janus NPs and supports the selectivity of Janus NPs for negatively charged lipid membranes. Furthermore, the anisotropic properties of Janus NPs were found to play a crucial role in their ability to disrupt the membrane via the combination of hydrophobic and electrostatic interactions. This finding is validated by testing the current Janus NP design on a bacterial membrane-mimicking model. This computational study may serve as a foundation for further studies aimed at optimizing the properties of Janus NPs for specific antimicrobial applications.
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Affiliation(s)
- Danh Nguyen
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
| | - James Wu
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Patrick Corrigan
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Ying Li
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
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Ureña J, Knight A, Lee IH. Membrane Cargo Density-Dependent Interaction between Protein and Lipid Domains on the Giant Unilamellar Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:4702-4712. [PMID: 35385290 DOI: 10.1021/acs.langmuir.2c00247] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Protein cargos anchored on the lipid membrane can be segregated by fluidic domain phase separation. Lipid membranes at certain compositions may separate into lipid domains to segregate cargos, and protein cargos themselves may be involved in protein condensate domain formation with multivalent binding proteins to segregate cargos. Recent studies suggest that these two driving forces of phase separation closely interact on the lipid membranes to promote codomain formation. In this report, we studied the effect of cargo density on the outcome of the cargo phase separation on giant unilamellar vesicles. Proteins and lipids are connected only by the anchored cargos, so it was originally hypothesized that higher cargo density would increase the degree of interaction between the lipid and protein domains, promoting more phase separation. However, fluorescence image analysis on different cargo densities showed that the cooperative domain formation and steric pressure are at a tug of war opposing each other. Cooperative domain formation is dominant under lower anchor density conditions, and above a threshold density, steric pressure was dominant opposing the domain formation. The result suggests that the cargo density is a key parameter affecting the outcome of cargo organization on the lipid membranes by phase separation.
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Affiliation(s)
- Juan Ureña
- Department of Chemistry and Biochemistry, Montclair State University, Montclair, New Jersey 07043, United States
| | - Ashlynn Knight
- Department of Biology, Montclair State University, Montclair, New Jersey 07043, United States
| | - Il-Hyung Lee
- Department of Chemistry and Biochemistry, Montclair State University, Montclair, New Jersey 07043, United States
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Rad AT, Hargrove D, Daneshmandi L, Ramsdell A, Lu X, Nieh MP. Codelivery of Paclitaxel and Parthenolide in Discoidal Bicelles for a Synergistic Anticancer Effect: Structure Matters. ADVANCED NANOBIOMED RESEARCH 2021. [DOI: 10.1002/anbr.202100080] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Armin Tahmasbi Rad
- Department of Biomedical Engineering University of Connecticut Storrs CT 06269 USA
- Polymer Program Institute of Materials Sciences University of Connecticut 191 Auditorium Road Storrs CT 06269 USA
- Encapsulate, University of Connecticut Technology Incubation Program Farmington CT 06032
| | - Derek Hargrove
- School of Pharmacy University of Connecticut Storrs CT 06269 USA
| | - Leila Daneshmandi
- Department of Biomedical Engineering University of Connecticut Storrs CT 06269 USA
- Encapsulate, University of Connecticut Technology Incubation Program Farmington CT 06032
| | - Amanda Ramsdell
- Department of Chemical and Bimolecular Engineering University of Connecticut Storrs CT 06269 USA
| | - Xiuling Lu
- Polymer Program Institute of Materials Sciences University of Connecticut 191 Auditorium Road Storrs CT 06269 USA
- School of Pharmacy University of Connecticut Storrs CT 06269 USA
| | - Mu-Ping Nieh
- Department of Biomedical Engineering University of Connecticut Storrs CT 06269 USA
- Polymer Program Institute of Materials Sciences University of Connecticut 191 Auditorium Road Storrs CT 06269 USA
- Department of Chemical and Bimolecular Engineering University of Connecticut Storrs CT 06269 USA
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Liu CH, Wang H, Yang L, Liu Y, Li X, Nieh MP. Nanocomplex made up of antimicrobial metallo-supramolecules and model biomembranes - characterization and enhanced fluorescence. NANOSCALE 2021; 13:14973-14979. [PMID: 34533183 PMCID: PMC8784953 DOI: 10.1039/d1nr04083a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Antimicrobial pentatopic 2,2':6',2''-terpyridines that form 3-D supramolecular hexagonal prisms with Cd2+ through coordination driven self-assembly can be entrapped by lipid discoidal bicelles, composed of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine, 1,2-dihexanoyl-sn-glycero-3-phosphocholine and 1,2-dipalmitoyl-sn-glycero-3-phospho-(1'-rac-glycerol) lipid, forming a well-defined nanocomplex. Structural characterization performed by very small angle neutron scattering, small angle X-ray scattering and transmission electron microscopy suggests that the hexagonal prisms are preferably located at the rim of bicellar discs with the hexagonal face in parallel with the bilayers, instead of face-to-face stacking. Such a configuration reduces the π-π interaction and consequently enhances the fluorescence emission. Since novel supramolecules were reported to have antibiotic functions, this study provides insight into the interactions of antimicrobial supermolecules with lipid membranes, leading to potential theranostic applications.
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Affiliation(s)
- Chung-Hao Liu
- Polymer Program, Institute of Material Science, University of Connecticut, Storrs, Connecticut 06269, USA.
| | - Heng Wang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China
| | - Lin Yang
- National Synchrotron Light Source - II, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Yun Liu
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
- Chemical & Biomolecular Engineering Department, University of Delaware, Newark, Delaware 19716, USA
| | - Xiaopeng Li
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China
| | - Mu-Ping Nieh
- Polymer Program, Institute of Material Science, University of Connecticut, Storrs, Connecticut 06269, USA.
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
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Rad AT, Bao Y, Jang HS, Xia Y, Sharma H, Dormidontova EE, Zhao J, Arora J, John VT, Tang BZ, Dainese T, Hariri A, Jokerst JV, Maran F, Nieh MP. Aggregation-Enhanced Photoluminescence and Photoacoustics of Atomically Precise Gold Nanoclusters in Lipid Nanodiscs (NANO 2). ADVANCED FUNCTIONAL MATERIALS 2021; 31:2009750. [PMID: 34366760 PMCID: PMC8341053 DOI: 10.1002/adfm.202009750] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Indexed: 05/25/2023]
Abstract
The authors designed a structurally stable nano-in-nano (NANO2) system highly capable of bioimaging via an aggregation-enhanced NIR excited emission and photoacoustic response achieved based on atomically precise gold nanoclusters protected by linear thiolated ligands [Au25(SC n H2n+1)18, n = 4-16] encapsulated in discoidal phospholipid bicelles through a one-pot synthesis. The detailed morphological characterization of NANO2 is conducted using cryogenic transmission electron microscopy, small/wide angle X-ray scattering with the support of molecular dynamics simulations, providing information on the location of Au nanoclusters in NANO2. The photoluminescence observed for NANO2 is 20-60 times more intense than that of the free Au nanoclusters, with both excitation and emission wavelengths in the near-infrared range, and the photoacoustic signal is more than tripled. The authors attribute this newly discovered aggregation-enhanced photoluminescence and photoacoustic signals to the restriction of intramolecular motion of the clusters' ligands. With the advantages of biocompatibility and high cellular uptake, NANO2 is potentially applicable for both in vitro and in vivo imaging, as the authors demonstrate with NIR excited emission from in vitro A549 human lung and the KB human cervical cancer cells.
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Affiliation(s)
- Armin Tahmasbi Rad
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Yue Bao
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Hyun-Sook Jang
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA; Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
| | - Yan Xia
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Hari Sharma
- Department of Physics, University of Connecticut, Storrs, CT 06269, USA
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA; Department of Physics, University of Connecticut, Storrs, CT 06269, USA
| | - Jing Zhao
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Jaspreet Arora
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA
| | - Vijay T John
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA
| | - Ben Zhong Tang
- Department of Chemistry, the Hong Kong University of Science and Technology, Hong Kong, P. R. China
| | - Tiziano Dainese
- Department of Chemistry, University of Padova, Padova 35131, Italy
| | - Ali Hariri
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Jesse V Jokerst
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Flavio Maran
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA, Department of Chemistry, University of Padova, Padova 35131, Italy
| | - Mu-Ping Nieh
- Department of Biomedical Engineering, University of Connecticut Storrs, CT 06269, USA; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA; Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA
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Tahmasbi Rad A, Malik S, Yang L, Oberoi-Khanuja TK, Nieh MP, Bahal R. A universal discoidal nanoplatform for the intracellular delivery of PNAs. NANOSCALE 2019; 11:12517-12529. [PMID: 31188378 DOI: 10.1039/c9nr03667a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Peptide nucleic acids (PNAs) have gained considerable attention due to their remarkable potential in gene editing and targeting-based strategies. However, cellular delivery of PNAs remains a challenge in developing their broader therapeutic applications. Here, we investigated a novel complex made of lipid bicelles and PNA-based carriers for the efficient delivery of PNAs. For proof of concept, PNAs targeting microRNA (miR) 210 and 155 were tested. Comprehensive evaluation of positive as well as negative charge-containing bicelles with PNA : lipid ratios of 1 : 100, 1 : 1000, and 1 : 2500 was performed. The negatively charged bicelles with a PNA : lipid molar ratio of 1 : 2500 yielded a discoidal shape with a uniform diameter of ∼30 nm and a bilayer thickness of 5 nm, while the positively charged bicellar system contained irregular vesicles after the incorporation of PNA. Small-angle X-ray scattering (SAXS) analysis was performed to provide insight into how the hydrophobic PNAs interact with bicelles. Further, flow cytometry followed by confocal microscopy analyses substantiate the superior transfection efficiency of bicelles containing dye-conjugated antimiR PNAs. Functional analysis also confirmed miR inhibition by PNA oligomers delivered by bicelles. The nanodiscoidal complex opens a new pathway to deliver PNAs, which, on their own, are a great challenge to be endocytosed into cells.
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Affiliation(s)
- Armin Tahmasbi Rad
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA. and Polymer Program, Institute of Materials Sciences, University of Connecticut, 191 Auditorium Road, Storrs, CT 06269, USA
| | - Shipra Malik
- School of Pharmacy, University of Connecticut, Storrs, CT 06269, USA.
| | - Lin Yang
- National Synchrotron Light Source - II, Brookhaven National Laboratory, Upton, NY, USA
| | | | - Mu-Ping Nieh
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA. and Polymer Program, Institute of Materials Sciences, University of Connecticut, 191 Auditorium Road, Storrs, CT 06269, USA and Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Raman Bahal
- School of Pharmacy, University of Connecticut, Storrs, CT 06269, USA.
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Huang H, Ge B, Zhang S, Li J, Sun C, Yue T, Huang F. Using Fluorescence Quenching Titration to Determine the Orientation of a Model Transmembrane Protein in Mimic Membranes. MATERIALS 2019; 12:ma12030349. [PMID: 30678051 PMCID: PMC6384929 DOI: 10.3390/ma12030349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 01/16/2019] [Accepted: 01/18/2019] [Indexed: 11/21/2022]
Abstract
After synthesis of transmembrane proteins (TMPs), they are transferred and inserted into plasma membranes to play biological functions. Crucially, orientation of TMPs in membranes determines whether they have biological activities. In cellular environments, a number of cofactors, such as translocon, can assist TMPs to be inserted into membranes in defined orientations. During in vitro reconstitution of TMPs with mimic membranes, both insertion and orientation of TMPs are primarily determined by interactions with the membrane. Yet the knowledge is limited, hindering the in vitro applications of TMPs. Here, we take Bacteriorhodopsin (bR) as a model TMP, using fluorescence quenching titration experiment to identify orientation of bR in mimic membranes, examining effects of a number of factors, including lipid composition, pH value, ionic strength and membrane curvature. The most effective determinant is the lipid type, which modulates insertion and orientation of bR in membranes by changing the membrane surface charge and the membrane fluidity. Both the pH value and the ionic strength play secondary roles by tuning the nature of the electrostatic interaction. The membrane curvature was found to have a minor effect on orientation of bR in membranes. By comparing orientations of bR in folded and unfolded states, no obvious change was observed, informing that nascent proteins could be inserted into membranes in defined orientations before folding into the native state inside the membrane.
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Affiliation(s)
- Haihong Huang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China.
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
| | - Baosheng Ge
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
| | - Shuai Zhang
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
| | - Jiqiang Li
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
| | - Chenghao Sun
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
| | - Tongtao Yue
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China.
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
| | - Fang Huang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China.
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
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