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Li K, Liu S, Li J, Yi D, Shao D, Hu T, Zheng X. Manganese supplementation of orthopedic implants: a new strategy for enhancing integrin-mediated cellular responses. Biomater Sci 2023; 11:3893-3905. [PMID: 37083965 DOI: 10.1039/d2bm02165j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
Integrin-mediated osteoblast adhesion to adsorbed extracellular ligands on orthopedic implants is crucial for the subsequent osteoblast behaviors and ultimate osseointegration. Considerable research efforts have focused on the development of implant surfaces that promote the adsorption of extracellular ligands, but ignored the fact that integrin binding to ligands requires divalent cations (such as Mn2+). Here, three kinds of Mn-doped nanowire-structured TiO2 coatings with 1.9, 3.9, and 8.8 wt% dopant contents (Mn1-, Mn2-, and Mn3-TiO2) were synthesized on Ti implants to enhance integrin-mediated osteoblastic responses. The Mg-doped and undoped TiO2 nanocoatings served as the control. Mn element was not only successfully incorporated into the TiO2 matrix, but also formed an oxygen-deficient Mn oxide on the nanowire surface. Although the adsorbed fibronectin (Fn) amount on Mn-doped nanocoatings and its unfolded status were slightly attenuated with increasing Mn amount, the interaction between the coating extract and Fn demonstrated a Mn2+-induced unfolding of Fn with the exposure of the RGD motif. Compared to the Mn1-, Mn2- and Mg-doped TiO2 nanocoatings, the Mn3-TiO2 nanocoating significantly upregulated the expression of integrin α5β1 probably through increasing the ligand-binding affinity of the integrin rather than integrin binding sites in Fn. Consistent with the activation trend of integrin α5β1, the Mn3-TiO2 nanocoating enhanced cell adhesion with the long stretched structure of actin fibers and extensive formation of vinculin focal adhesion spots and upregulated the levels of alkaline phosphatase and osteocalcin activities. Therefore, Mn supplementation of orthopedic implants may be a promising way to improve osteogenesis at the implant surface.
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Affiliation(s)
- Kai Li
- Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Shiwei Liu
- Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Jieping Li
- Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Deliang Yi
- Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
| | - Dandan Shao
- Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Tao Hu
- Department of Spine Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xuebin Zheng
- Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
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Liu Y, Gao J, Liu L, Kang J, Luo X, Kong Y, Zhang G. Identification and Characterization of Fibronectin-Binding Peptides in Gelatin. Polymers (Basel) 2022; 14:polym14183757. [PMID: 36145902 PMCID: PMC9506415 DOI: 10.3390/polym14183757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 09/03/2022] [Accepted: 09/05/2022] [Indexed: 11/16/2022] Open
Abstract
Collagen and fibronectin (FN) are important components in the extracellular matrix (ECM). Collagen-FN binding belongs to protein-protein interaction and plays a key role in regulating cell behaviors. In this study, FN-binding peptides were isolated from gelatin (degraded collagen) using affinity chromatography, and the amino acid sequences were determined using HPLC-MS. The results indicated that all FN-binding peptides contained GPAG or GPPG. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and dual-polarization interferometry (DPI) were used to analyze the effects of hydroxylation polypeptide on FN binding activity. DPI analysis indicated that peptides with molecular weight (MW) between 2 kDa and 30 kDa showed higher FN-binding activity, indicating MW range played an important role in the interaction between FN and peptides. Finally, two peptides with similar sequences except for hydroxylation of prolines were synthesized. The FN-binding properties of the synthesized peptides were determined by MALDI-TOF MS. For peptide, GAPGADGP*AGAPGTP*GPQGIAGQR, hydroxylation of P8 and P15 is necessary for FN-binding. For peptide, GPPGPMGPPGLAGPPGESGR, the FN-binding process is independent of proline hydroxylation. Thus, FN-binding properties are proline-hydroxylation dependent.
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Affiliation(s)
- Yuying Liu
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianping Gao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin Liu
- Library of Shandong Agricultural University, Tai’an 271018, China
| | - Jiyao Kang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Xi Luo
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yingjun Kong
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Guifeng Zhang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Correspondence:
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Lee KY, Nguyen HT, Setiawati A, Nam S, Kim M, Ko I, Jung WH, Parker KK, Kim C, Shin K. An Extracellular Matrix-Liposome Composite, a Novel Extracellular Matrix Delivery System for Accelerated Tissue Regeneration. Adv Healthc Mater 2022; 11:e2101599. [PMID: 34800312 DOI: 10.1002/adhm.202101599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/26/2021] [Indexed: 11/10/2022]
Abstract
The unfolded states of fibronectin (FN) subsequently induce the formation of an extracellular matrix (ECM) fibrillar network, which is necessary to generate new substitutive tissues. Here, the authors demonstrate that negatively charged small unilamellar vesicles (SUVs) qualify as candidates for FN delivery due to their remarkable effects on the autonomous binding and unfolding of FN, which leads to increased tissue regeneration. In vitro experiments revealed that the FN-SUV complex remarkably increased the attachment, differentiation, and migration of fibroblasts. The potential utilization of this complex in vivo to treat inflammatory colon diseases is also described based on results obtained for ameliorated conditions in rats with ulcerative colitis (UC) that had been treated with the FN-SUV complex. Their findings provide a new ECM-delivery platform for ECM-based therapeutic applications and suggest that properly designed SUVs may be an unprecedented FN-delivery system that is highly effective in treating UC and inflammatory bowel diseases.
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Affiliation(s)
- Keel Yong Lee
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea
- Disease Biophysics Group John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge 02138 USA
| | - Huong Thanh Nguyen
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea
| | - Agustina Setiawati
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea
- Department of Life Science Sogang University Seoul 02447 Republic of Korea
- Faculty of Pharmacy Sanata Dharma University Yogyakarta 55284 Indonesia
| | - So‐Jung Nam
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea
| | - Minyoung Kim
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea
| | - Il‐Gyu Ko
- Department of Physiology College of Medicine Kyung Hee University Seoul 02447 Republic of Korea
| | - Won Hee Jung
- Department of Systems Biotechnology Chung‐Ang University Anseong 17546 Republic of Korea
| | - Kevin K. Parker
- Disease Biophysics Group John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge 02138 USA
| | - Chang‐Ju Kim
- Department of Physiology College of Medicine Kyung Hee University Seoul 02447 Republic of Korea
| | - Kwanwoo Shin
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea
- Disease Biophysics Group John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge 02138 USA
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Trujillo S, Gonzalez-Garcia C, Rico P, Reid A, Windmill J, Dalby MJ, Salmeron-Sanchez M. Engineered 3D hydrogels with full-length fibronectin that sequester and present growth factors. Biomaterials 2020; 252:120104. [DOI: 10.1016/j.biomaterials.2020.120104] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 05/04/2020] [Accepted: 05/05/2020] [Indexed: 12/22/2022]
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Fibronectin amyloid-like aggregation alters its extracellular matrix incorporation and promotes a single and sparsed cell migration. Exp Cell Res 2018; 371:104-121. [PMID: 30076804 DOI: 10.1016/j.yexcr.2018.07.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 07/05/2018] [Accepted: 07/29/2018] [Indexed: 12/14/2022]
Abstract
Fibronectin (Fn) is an extracellular matrix (ECM) multifunctional glycoprotein essential for regulating cells behaviors. Within ECM, Fn is found as polymerized fibrils. Apart from fibrils, Fn could also form other kind of supramolecular assemblies such as aggregates. To gain insight into the impact of Fn aggregates on cell behavior, we generated several Fn oligomeric assemblies. These assemblies displayed various amyloid-like properties but were not cytotoxic. In presence of the more amyloid-like structured assemblies of Fn, the cell-ECM networks were altered and the cell shapes shifted toward extended mesenchymal morphologies. Additionnaly, the Fn amyloid-like aggregates promoted a single-cell and sparsed migration of SKOV3 cancer cells, which was associated with a relocalization of αv integrins from plasma membrane to perinuclear vesicles. These data pointed out that the features of supramolecular Fn assemblies could represent a higher level of fine-tuning cell phenotype, and especially migration of cancer cells.
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Bascetin R, Admane K, Agniel R, Boudou T, Doussineau T, Antoine R, Gallet O, Leroy-Dudal J, Vendrely C. Amyloid-like aggregates formation by blood plasma fibronectin. Int J Biol Macromol 2017; 97:733-743. [PMID: 28109813 DOI: 10.1016/j.ijbiomac.2017.01.061] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 01/06/2017] [Accepted: 01/12/2017] [Indexed: 10/20/2022]
Abstract
Fibronectin (FN) is a multifunctional glycoprotein of the extracellular matrix (ECM) playing critical roles in physiological and pathological cell processes like adhesion, migration, growth, and differentiation. These various functions of FN are modulated by its supramolecular state. Indeed, FN can polymerize into different types of assemblies like fibrils and aggregates. However, the mechanism of polymerization and the effects of such assemblies on cell behaviors still remain to be elucidated. Here we show that upon irreversible thermal denaturation, human blood plasma fibronectin forms high molecular weight aggregates. These compact and globular aggregates show amyloid features: they are stabilized by intermolecular b-sheets, they bind Thioflavin T and they are resistant to reducing and denaturing agents. Their characterization by electrospray ionization charge detection mass spectrometry shows that two populations can be distinguished according to the mass and charge density. Despite their amyloid features and the presence of hydrophobic patches on their surface, these aggregates are not toxic for cells. However, their binding abilities to gelatin and RGD are drastically decreased compare to native FN, suggesting possible effects on ECM-cell interactions.
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Affiliation(s)
- Rümeyza Bascetin
- ERRMECe, I-MAT FD4122, Université de Cergy-Pontoise, MIR, rue Descartes, 95031, Neuville sur Oise Cedex, France
| | - Khadija Admane
- ERRMECe, I-MAT FD4122, Université de Cergy-Pontoise, MIR, rue Descartes, 95031, Neuville sur Oise Cedex, France
| | - Rémy Agniel
- ERRMECe, I-MAT FD4122, Université de Cergy-Pontoise, MIR, rue Descartes, 95031, Neuville sur Oise Cedex, France
| | - Thomas Boudou
- Université Grenoble Alpes, Institut Technologique de Grenoble, CNRS, UMR 5628, LMGP, 3 Parvis Louis Néel, 38016, Grenoble, France
| | - Tristan Doussineau
- Université Lyon 1-CNRS, Université de Lyon, UMR5306, Institut Lumière Matière, 69622, Villeurbanne, France
| | - Rodolphe Antoine
- Université Lyon 1-CNRS, Université de Lyon, UMR5306, Institut Lumière Matière, 69622, Villeurbanne, France
| | - Olivier Gallet
- ERRMECe, I-MAT FD4122, Université de Cergy-Pontoise, MIR, rue Descartes, 95031, Neuville sur Oise Cedex, France
| | - Johanne Leroy-Dudal
- ERRMECe, I-MAT FD4122, Université de Cergy-Pontoise, MIR, rue Descartes, 95031, Neuville sur Oise Cedex, France
| | - Charlotte Vendrely
- ERRMECe, I-MAT FD4122, Université de Cergy-Pontoise, MIR, rue Descartes, 95031, Neuville sur Oise Cedex, France.
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7
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Liang X, Garcia BL, Visai L, Prabhakaran S, Meenan NAG, Potts JR, Humphries MJ, Höök M. Allosteric Regulation of Fibronectin/α5β1 Interaction by Fibronectin-Binding MSCRAMMs. PLoS One 2016; 11:e0159118. [PMID: 27434228 PMCID: PMC4951027 DOI: 10.1371/journal.pone.0159118] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Accepted: 06/27/2016] [Indexed: 12/03/2022] Open
Abstract
Adherence of microbes to host tissues is a hallmark of infectious disease and is often mediated by a class of adhesins termed MSCRAMMs (Microbial Surface Components Recognizing Adhesive Matrix Molecules). Numerous pathogens express MSCRAMMs that specifically bind the heterodimeric human glycoprotein fibronectin (Fn). In addition to roles in adhesion, Fn-binding MSCRAMMs exploit physiological Fn functions. For example, several pathogens can invade host cells by a mechanism whereby MSCRAMM-bound Fn bridges interaction with α5β1 integrin. Here, we investigate two Fn-binding MSCRAMMs, FnBPA (Staphylococcus aureus) and BBK32 (Borrelia burgdorferi) to probe structure-activity relationships of MSCRAMM-induced Fn/α5β1integrin activation. Circular dichroism, fluorescence resonance energy transfer, and dynamic light scattering techniques uncover a conformational rearrangement of Fn involving domains distant from the MSCRAMM binding site. Surface plasmon resonance experiments demonstrate a significant enhancement of Fn/α5β1 integrin affinity in the presence of FnBPA or BBK32. Detailed kinetic analysis of these interactions reveal that this change in affinity can be attributed solely to an increase in the initial Fn/α5β1 on-rate and that this rate-enhancement is dependent on high-affinity Fn-binding by MSCRAMMs. These data implicate MSCRAMM-induced perturbation of specific intramolecular contacts within the Fn heterodimer resulting in activation by exposing previously cryptic α5β1 interaction motifs. By correlating structural changes in Fn to a direct measurement of increased Fn/α5β1 affinity, this work significantly advances our understanding of the structural basis for the modulation of integrin function by Fn-binding MSCRAMMs.
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Affiliation(s)
- Xiaowen Liang
- Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, 77030, United States of America
| | - Brandon L. Garcia
- Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, 77030, United States of America
| | - Livia Visai
- Dep. of Molecular Medicine, UdR INSTM, Center for Tissue Engineering (C.I.T.), University of Pavia, 27100, Pavia, Italy
- Dep. of Occupational Medicine, Ergonomy and Disability, Salvatore Maugeri Foundation, IRCCS, Nanotechnology Laboratory, 27100, Pavia, Italy
| | - Sabitha Prabhakaran
- Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, 77030, United States of America
| | | | - Jennifer R. Potts
- Department of Biology, University of York, York, YO10 5DD, United Kingdom
| | - Martin J. Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, United Kingdom
| | - Magnus Höök
- Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, 77030, United States of America
- * E-mail:
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Montaño-Machado V, Chevallier P, Mantovani D, Pauthe E. On the potential for fibronectin/phosphorylcholine coatings on PTFE substrates to jointly modulate endothelial cell adhesion and hemocompatibility properties. BIOMATTER 2015; 5:e979679. [PMID: 25785369 PMCID: PMC4581125 DOI: 10.4161/21592535.2014.979679] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The use of biomolecules as coatings on biomaterials is recognized to constitute a promising approach to modulate the biological response of the host. In this work, we propose a coating composed by 2 biomolecules susceptible to provide complementary properties for cardiovascular applications: fibronectin (FN) to enhance endothelialization, and phosphorylcholine (PRC) for its non thrombogenic properties. Polytetrafluoroethylene (PTFE) was selected as model substrate mainly because it is largely used in cardiovascular applications. Two approaches were investigated: 1) a sequential adsorption of the 2 biomolecules and 2) an adsorption of the protein followed by the grafting of phosphorylcholine via chemical activation. All coatings were characterized by immunofluorescence staining, X-Ray Photoelectron Spectroscopy and Scanning Electron Microscopy analyses. Assays with endothelial cells showed improvement on cell adhesion, spreading and metabolic activity on FN-PRC coatings compared with the uncoated PTFE. Platelets adhesion and activation were both reduced on the coated surfaces when compared with uncoated PTFE. Moreover, clotting time tests exhibited better hemocompatibility properties of the surfaces after a sequential adsorption of FN and PRC. In conclusion, FN-PRC coating improves cell adhesion and non-thrombogenic properties, thus revealing a certain potential for the development of this combined deposition strategy in cardiovascular applications.
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Affiliation(s)
- Vanessa Montaño-Machado
- a Laboratory for Biomaterials & Bioengineering (CRC-I); Department of Min-Met-Materials Engineering & CHU de Quebec Research Center; Laval University ; Quebec City , Canada
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Agniel R, Vendrely C, Poulouin L, Bascetin R, Benachour H, Gallet O, Leroy-Dudal J. Lectins as probes for assessing the accessibility ofN-linked glycans in relation to the conformational changes of fibronectin. J Mol Recognit 2015; 28:731-41. [DOI: 10.1002/jmr.2487] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 05/28/2015] [Accepted: 05/29/2015] [Indexed: 12/22/2022]
Affiliation(s)
- Rémy Agniel
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
| | - Charlotte Vendrely
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
| | - Laurent Poulouin
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
- Orange; Direction Nord de France; 2 rue Trémière Villeneuve d'Ascq F-59650 France
| | - Rümeyza Bascetin
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
| | - Hamanou Benachour
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
| | - Olivier Gallet
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
| | - Johanne Leroy-Dudal
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des matériaux, I-MAT (FD4122); Université de Cergy-Pontoise, F-95000 Cergy-Pontoise; 2 Avenue Adolphe Chauvin Cergy-Pontoise Cedex 95302 France
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10
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Effects of human fibronectin and human serum albumin sequential adsorption on preosteoblastic cell adhesion. Biointerphases 2014; 9:029008. [DOI: 10.1116/1.4867598] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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11
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Carduner L, Agniel R, Kellouche S, Picot CR, Blanc-Fournier C, Leroy-Dudal J, Carreiras F. Ovarian cancer ascites-derived vitronectin and fibronectin: combined purification, molecular features and effects on cell response. Biochim Biophys Acta Gen Subj 2013; 1830:4885-97. [PMID: 23811340 DOI: 10.1016/j.bbagen.2013.06.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 06/11/2013] [Accepted: 06/17/2013] [Indexed: 02/04/2023]
Abstract
BACKGROUND Intra-abdominal ascites is a complication of ovarian cancers and constitutes a permissive microenvironment for metastasis. Since fibronectin and vitronectin are key actors in ovarian cancer progression, we investigated their occurrence and molecular characteristics in various ascites fluids and the influence of these ascites-derived proteins on cell behavior. METHODS Fibronectin and vitronectin were investigated by immunoblotting within various ascites fluids. A combined affinity-based protocol was developed to purify both proteins from the same sample. Each purified protein was characterized with regard to its molecular features (molecular mass of isoforms, tryptophan intramolecular environment, hydrodynamic radii), and its influence on cell adhesion. RESULTS Fibronectin and vitronectin were found in all tested ascites. Several milligrams of purified proteins were obtained from ascites of varying initial volumes. Molecular mass isoforms and conformational lability of proteins differed according to the ascites of origin. When incorporated into the cancer cell environment, ascites-derived fibronectin and vitronectin supported cell adhesion and migration with various degrees of efficiency, and induced the recruitment of integrins into focal contacts. CONCLUSIONS To our knowledge, this is the first combined purification of two extracellular matrix proteins from a single pathological sample containing a great variety of bioactive molecules. This study highlights that ascites-derived fibronectin and vitronectin exhibit different properties depending on the ascites. GENERAL SIGNIFICANCE Investigating the relationships between the molecular properties of ascites components and ovarian cancer cell phenotype according to the ascites may be critical for a better understanding of the recurrence of this lethal disease and for further biomarker identification.
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Affiliation(s)
- Ludovic Carduner
- Institut des Matériaux, Université de Cergy-Pontoise, Cergy-Pontoise Cedex, France
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12
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Lori C, Lantella A, Pasquo A, Alexander LT, Knapp S, Chiaraluce R, Consalvi V. Effect of single amino acid substitution observed in cancer on Pim-1 kinase thermodynamic stability and structure. PLoS One 2013; 8:e64824. [PMID: 23755147 PMCID: PMC3673989 DOI: 10.1371/journal.pone.0064824] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 04/18/2013] [Indexed: 11/19/2022] Open
Abstract
Pim-1 kinase, a serine/threonine protein kinase encoded by the pim proto-oncogene, is involved in several signalling pathways such as the regulation of cell cycle progression and apoptosis. Many cancer types show high expression levels of Pim kinases and particularly Pim-1 has been linked to the initiation and progression of the malignant phenotype. In several cancer tissues somatic Pim-1 mutants have been identified. These natural variants are nonsynonymous single nucleotide polymorphisms, variations of a single nucleotide occurring in the coding region and leading to amino acid substitutions. In this study we investigated the effect of amino acid substitution on the structural stability and on the activity of Pim-1 kinase. We expressed and purified some of the mutants of Pim-1 kinase that are expressed in cancer tissues and reported in the single nucleotide polymorphisms database. The point mutations in the variants significantly affect the conformation of the native state of Pim-1. All the mutants, expressed as soluble recombinant proteins, show a decreased thermal and thermodynamic stability and a lower activation energy values for kinase activity. The decreased stability accompanied by an increased flexibility suggests that Pim-1 variants may be involved in a wider network of protein interactions. All mutants bound ATP and ATP mimetic inhibitors with comparable IC50 values suggesting that the studied Pim-1 kinase mutants can be efficiently targeted with inhibitors developed for the wild type protein.
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Affiliation(s)
- Clorinda Lori
- Department of Biochemical Sciences “A. Rossi Fanelli”, Sapienza University of Rome, Rome, Italy
| | - Antonella Lantella
- Department of Biochemical Sciences “A. Rossi Fanelli”, Sapienza University of Rome, Rome, Italy
| | | | - Leila T. Alexander
- Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Stefan Knapp
- Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Roberta Chiaraluce
- Department of Biochemical Sciences “A. Rossi Fanelli”, Sapienza University of Rome, Rome, Italy
- * E-mail:
| | - Valerio Consalvi
- Department of Biochemical Sciences “A. Rossi Fanelli”, Sapienza University of Rome, Rome, Italy
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13
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Guanidine-HCl dependent structural unfolding of M-crystallin: fluctuating native state like topologies and intermolecular association. PLoS One 2012; 7:e42948. [PMID: 23284604 PMCID: PMC3524170 DOI: 10.1371/journal.pone.0042948] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Accepted: 07/16/2012] [Indexed: 11/19/2022] Open
Abstract
Numerous experimental techniques and computational studies, proposed in recent times, have revolutionized the understanding of protein-folding paradigm. The complete understanding of protein folding and intermediates are of medical relevance, as the aggregation of misfolding proteins underlies various diseases, including some neurodegenerative disorders. Here, we describe the unfolding of M-crystallin, a βγ-crystallin homologue protein from archaea, from its native state to its denatured state using multidimensional NMR and other biophysical techniques. The protein, which was earlier characterized to be a predominantly β-sheet protein in its native state, shows different structural propensities (α and β), under different denaturing conditions. In 2 M GdmCl, the protein starts showing two distinct sets of peaks, with one arising from a partially unfolded state and the other from a completely folded state. The native secondary structural elements start disappearing as the denaturant concentration approaches 4 M. Subsequently, the protein is completely unfolded when the denaturant concentration is 6 M. The (15)N relaxation data (T(1)/T(2)), heteronuclear (1)H-(15)N Overhauser effects (nOes), NOESY data, and other biophysical data taken together indicate that the protein shows a consistent, gradual change in its structural and motional preferences with increasing GdmCl concentration.
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Dubiel EA, Vermette P. Solution composition impacts fibronectin immobilization on carboxymethyl-dextran surfaces and INS-1 insulin secretion. Colloids Surf B Biointerfaces 2012; 95:266-73. [DOI: 10.1016/j.colsurfb.2012.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 02/20/2012] [Accepted: 03/12/2012] [Indexed: 12/19/2022]
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15
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Sima F, Davidson P, Pauthe E, Sima L, Gallet O, Mihailescu I, Anselme K. Fibronectin layers by matrix-assisted pulsed laser evaporation from saline buffer-based cryogenic targets. Acta Biomater 2011; 7:3780-8. [PMID: 21704740 DOI: 10.1016/j.actbio.2011.06.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2011] [Revised: 06/09/2011] [Accepted: 06/10/2011] [Indexed: 11/26/2022]
Abstract
The deposition of fibronectin (FN) from saline buffer-based cryogenic targets by matrix-assisted pulsed laser evaporation (MAPLE) onto silicon substrates is reported. A uniform distribution of FN was revealed by Ponceau staining after control experiments on nitrocellulose paper. Well-organized particulates with heights from hundreds of nanometers up to more than 1 μm packed in homogeneous layers were evidenced by optical microscopy and profilometry on Si substrates. Atomic force microscopy images showed regions composed of buffer and FN aggregates forming a compact film. Comparison of infrared spectra of drop-cast and MAPLE-deposited FN confirmed the preservation of composition and showed no degradation of the protein. The protein deposition on Si was confirmed by antibody staining. Small aggregates and fluorescent fibrils were visualized by fluorescence microscopy. Superior attachment of human osteoprogenitor cells cultivated for 3 h proved the presence of stable and intact FN molecules after transfer.
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16
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Guzzi R, Babavali M, Bartucci R, Sportelli L, Esmann M, Marsh D. Spin-echo EPR of Na,K-ATPase unfolding by urea. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:1618-28. [DOI: 10.1016/j.bbamem.2010.11.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 11/03/2010] [Accepted: 11/03/2010] [Indexed: 11/15/2022]
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17
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Hindié M, Degat MC, Gaudière F, Gallet O, Van Tassel PR, Pauthe E. Pre-osteoblasts on poly(L-lactic acid) and silicon oxide: Influence of fibronectin and albumin adsorption. Acta Biomater 2011; 7:387-94. [PMID: 20692384 DOI: 10.1016/j.actbio.2010.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 06/22/2010] [Accepted: 08/03/2010] [Indexed: 11/17/2022]
Abstract
Cell adhesion and subsequent viability are critical initial steps in biomaterial-tissue integration and are strongly dependent on the material properties and the presence of matrix proteins. In the present study MC3T3-E1 osteoblast-like cell behavior on silicon oxide (SO) and poly(L-lactic acid) (PLLA) substrates has been examined, with a focus on the influence of the adhesive protein fibronectin and the non-adhesive protein albumin adsorbed on the substrates. Quartz crystal microgravimetry showed adsorption of fibronectin and albumin to be nearly identical on SO and PLLA. Subsequent exposure a previously adsorbed fibronectin layer to albumin decreased the rigidity of the adsorbed layer without any measurable increase in adsorbed mass. Cell adhesion and spreading were significantly enhanced on both SO and PLLA substrates coated with fibronectin or with fibronectin and albumin, compared with uncoated or albumin-coated substrates. The only statistically significant difference between the two substrates in these assays was increased spreading on PLLA compared with SO in the presence of fibronectin and albumin. Cell proliferation was significantly higher on SO compared with PLLA after 7 days culture, but depended on the presence of fibronectin only in the PLLA system. In contrast, mitochondrial activity was higher on PLLA than on SO, and was enhanced by fibronectin on both substrates. PLLA substrates coated with fibronectin and subsequently exposed to albumin exhibited the highest level of cell differentiation, as assayed via alkaline phosphatase activity. These results demonstrate the importance of adsorbed proteins on osteoblast-like cell-surface interactions.
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Affiliation(s)
- Mathilde Hindié
- ERRMECe, Université de Cergy-Pontoise, Site Saint-Martin, France
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18
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Hoffmann C, Faure AC, Vancaeyzeele C, Roux S, Tillement O, Pauthe E, Goubard F. Labeling of fibronectin by fluorescent and paramagnetic nanoprobes for exploring the extracellular matrix: bioconjugate synthesis optimization and biochemical characterization. Anal Bioanal Chem 2010; 399:1653-63. [PMID: 21153583 DOI: 10.1007/s00216-010-4476-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 11/03/2010] [Accepted: 11/25/2010] [Indexed: 01/01/2023]
Abstract
In this study, fibronectin-nanoparticles bioconjugates are developed and characterized. Multilabeled nanoparticles are composed of a core of the rare-earth oxide Gd(2)O(3):Tb(3+), capped with a set of Rhodamine B isothiocyanate encapsulated in a silica matrix and functionalized by a carboxylated polyethylene glycol shell. These nanoparticles are stabilized in aqueous solution and are found to contain about 400 carboxyl groups on their surface. Nanoparticle bioconjugation with highly purified human plasma fibronectin (Fn) is mediated by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide, resulting in an amide linkage between the carboxylic acid-terminated surface of the nanoparticle and the primary amine of Fn. The bioconjugation temperature and pH are optimized. The Local structure and global conformation of fibronectin-nanoparticle bioconjugates (FnNP*) are studied by fluorescence spectroscopy and enzymatic sites accessibility. Protein biochemical functionalities are globally conserved, and the protein is actually labeled. Elaboration of such complexes provides a promising bimodal contrasting agent for in vivo imaging.
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Affiliation(s)
- Céline Hoffmann
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI-EA 2528), Institut des matériaux (I-MAT-FD 4122), Université de Cergy-Pontoise, 5 mail Gay-Lussac Neuville-sur-Oise, 95031 Cergy-Pontoise Cedex, France
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19
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Qu P, Lu H, Yan S, Zhou D, Lu Z. Investigations of effects of environmental factors in unfolding/refolding pathway of proteins on 8-anilino-1-naphthalene-sulfonic acid (ANS) fluorescence. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.07.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Babavali M, Esmann M, Fedosova NU, Marsh D. Urea-Induced Unfolding of Na,K-ATPase As Evaluated by Electron Paramagnetic Resonance Spectroscopy. Biochemistry 2009; 48:9022-30. [DOI: 10.1021/bi901124j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mohammad Babavali
- Department of Physiology and Biophysics, Aarhus University, Aarhus, Denmark
| | - Mikael Esmann
- Department of Physiology and Biophysics, Aarhus University, Aarhus, Denmark
| | | | - Derek Marsh
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie, 37077 Göttingen, Germany
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21
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Chugh J, Sharma S, Hosur RV. Comparison of NMR structural and dynamics features of the urea and guanidine-denatured states of GED. Arch Biochem Biophys 2009; 481:169-76. [PMID: 19026983 DOI: 10.1016/j.abb.2008.11.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2008] [Revised: 11/02/2008] [Accepted: 11/03/2008] [Indexed: 10/21/2022]
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22
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Faure AC, Hoffmann C, Bazzi R, Goubard F, Pauthe E, Marquette CA, Blum LJ, Perriat P, Roux S, Tillement O. Functionalization of luminescent aminated particles for facile bioconjugation. ACS NANO 2008; 2:2273-2282. [PMID: 19206393 DOI: 10.1021/nn8004476] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
For labeling proteins (streptavidin and fibronectin) by luminescent aminated nanoparticles, an interesting strategy that requires neither activation nor chemical pre- or post-treatment was explored. Because biomolecules are easily rendered luminescent after reaction with organic dyes carrying isothiocyanate moiety, phenylene diisothiocyanate (DITC) was used for covalently binding proteins onto luminescent hybrid gadolinium oxide nanoparticles whose ability to combine imaging and therapy was recently demonstrated.
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Affiliation(s)
- Anne-Charlotte Faure
- Laboratoire de Physico-Chimie des Materiaux Luminescents, UMR 5620 CNRS-Universite Claude Bernard Lyon 1, 69622 Villeurbanne Cedex, France
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23
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Nelea V, Nakano Y, Kaartinen MT. Size distribution and molecular associations of plasma fibronectin and fibronectin crosslinked by transglutaminase 2. Protein J 2008; 27:223-33. [PMID: 18330684 DOI: 10.1007/s10930-008-9128-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Fibronectin (FN) is a ubiquitously expressed cell adhesion protein capable of assembling into large, extended fibrillar networks as part of an extracellular matrix (ECM) that regulates cell behavior. FN is a substrate for certain members of the transglutaminase family of protein-crosslinking enzymes-enzymes which can modify the ability of FN to support cell adhesion. In this study, we have analyzed the thermo-chemical stability of plasma FN in its noncrosslinked form, and after crosslinking by transglutaminase 2 (TG2), using dynamic light scattering. We report that FN is found in a generally globular (8.7 nm hydrodynamic radius), dimerized form in aqueous solutions, but unfolds into a linear arrangement at high ionic (1 M NaCl) and chaotropic (5 M urea) environments. FN conformation remained stable after multiple heating and cooling cycles ranging from 4 to 60 degrees C. Crosslinking of FN with TG2 formed large, multimeric complexes having high chemical stability in aqueous, high ionic and chaotropic environments, demonstrating that this covalent modification stabilizes FN. Given recent data that substrate (e.g. ECM) rigidity profoundly affects cell differentiation and behavior, we further studied how TG2 crosslinking affects the molecular rigidity of FN by obtaining atomic force microscopy nanoindentation measurements from untreated and crosslinked FN samples embedded in acrylamide gels. We demonstrate that TG2-mediated crosslinking of FN significantly increases Young's modulus (of elasticity), an observation of increased rigidity having important implications with respect to the biological role of ECM protein-crosslinking in cell signaling and guiding cell differentiation.
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Affiliation(s)
- Valentin Nelea
- Faculty of Dentistry, McGill University, Montreal, QC, Canada, H3A 2B2
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24
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Chugh J, Sharma S, Kumar D, Misra JR, Hosur RV. Effect of a single point mutation on the stability, residual structure and dynamics in the denatured state of GED: relevance to self-assembly. Biophys Chem 2008; 137:13-8. [PMID: 18586378 DOI: 10.1016/j.bpc.2008.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Revised: 06/05/2008] [Accepted: 06/05/2008] [Indexed: 10/21/2022]
Abstract
The GTPase effector domain (GED) of dynamin forms large soluble oligomers in vitro, while its mutant--I697A--lacks this property at low concentrations. With a view to understand the intrinsic structural characteristics of the polypeptide chain, the global unfolding characteristics of GED wild type (WT) and I697A were compared using biophysical techniques. Quantitative analysis of the CD and fluorescence denaturation profiles revealed that unfolding occurred by a two-state process and the mutant was less stable than the WT. Even in the denatured state, the mutation caused chemical shift perturbations and significant differences were observed in the 15N transverse relaxation rates (R2), not only at the mutation site but all around. These results demonstrate that the hydrophobic change associated with the mutation perturbs the structural and motional preferences locally, which are then relayed via different folding pathways along the chain and the property of oligomerization in the native state is affected.
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Affiliation(s)
- Jeetender Chugh
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005, India
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25
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Kinetics of conformational changes of fibronectin adsorbed onto model surfaces. Colloids Surf B Biointerfaces 2008; 63:129-37. [DOI: 10.1016/j.colsurfb.2007.11.015] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 11/12/2007] [Accepted: 11/23/2007] [Indexed: 01/13/2023]
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26
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Sano K, Asahi M, Yanagibashi M, Hashii N, Itoh S, Kawasaki N, Ogawa H. Glycosylation and ligand-binding activities of rat plasma fibronectin during liver regeneration after partial hepatectomy. Carbohydr Res 2008; 343:2329-35. [PMID: 18490007 DOI: 10.1016/j.carres.2008.03.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Revised: 02/18/2008] [Accepted: 03/19/2008] [Indexed: 10/22/2022]
Abstract
Fibronectin (FN) is a multifunctional glycoprotein present in the extracellular matrix (ECM) and plasma. We previously reported that the glycosylation and ligand-binding of vitronectin (VN) change markedly after partial hepatectomy (PH). Here we show the changes of FN during liver regeneration. The yields of purified sham-operated (SH-) and PH-FN were higher than that of non-operated (NO)-FN, while binding activities of FNs to ECM ligands were changed only slightly by hepatectomy. The carbohydrate concentration of PH-FN decreased to 66% of that of NO- and SH-FN. By using LC/MS(n), eight kinds of complex-type N-glycan structures were found to be present in all FNs, and bi- and trisialobiantennary glycans were the major structures. Fucosylation was markedly increased, while O-acetylation of sialic acid was found to be decreased in PH-FN. The alterations in glycosylation and biological activities of FN after PH are different from those of VN, suggesting that these glycoproteins play different biological functions in tissue remodeling.
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Affiliation(s)
- Kotone Sano
- Graduate School of Humanities and Sciences, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo 112-8610, Japan
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27
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Aravind P, Chandra K, Reddy PP, Jeromin A, Chary K, Sharma Y. Regulatory and Structural EF-Hand Motifs of Neuronal Calcium Sensor-1: Mg2+ Modulates Ca2+ Binding, Ca2+-Induced Conformational Changes, and Equilibrium Unfolding Transitions. J Mol Biol 2008; 376:1100-15. [DOI: 10.1016/j.jmb.2007.12.033] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2007] [Revised: 12/11/2007] [Accepted: 12/17/2007] [Indexed: 11/26/2022]
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28
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Hoffmann C, Leroy-Dudal J, Patel S, Gallet O, Pauthe E. Fluorescein isothiocyanate-labeled human plasma fibronectin in extracellular matrix remodeling. Anal Biochem 2008; 372:62-71. [PMID: 17826731 DOI: 10.1016/j.ab.2007.07.027] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2007] [Revised: 07/23/2007] [Accepted: 07/23/2007] [Indexed: 12/31/2022]
Abstract
Fluorescein isothiocyanate (FITC) is a well-known probe for labeling biologically relevant proteins. However, the impact of the labeling procedure on protein structure and biological activities remains unclear. In this work, FITC-labeled human plasma fibronectin (Fn) was developed to gain insight into the dynamic relationship between cells and Fn. The similarities and differences concerning the structure and function between Fn-FITC and standard Fn were evaluated using biochemical as well as cellular approaches. By varying the FITC/Fn ratio, we demonstrated that overlabeling (>10 FITC molecules/Fn molecule) induces probe fluorescence quenching, protein aggregation, and cell growth modifications. A correct balance between reliable fluorescence for detection and no significant modifications to structure and biological function compared with standard Fn was obtained with a final ratio of 3 FITC molecules per Fn molecule (Fn-FITC3). Fn-FITC3, similar to standard Fn, is correctly recruited into the cell matrix network. Also, Fn-FITC3 is proposed to be a powerful molecular tool to investigate Fn organization and cellular behavior concomitantly.
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Affiliation(s)
- Celine Hoffmann
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules (ERRMECe), University of Cergy-Pontoise, 95302 Pontoise Cedex, France
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29
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Chatterjee A, Krishna Mohan PM, Prabhu A, Ghosh-Roy A, Hosur RV. Equilibrium unfolding of DLC8 monomer by urea and guanidine hydrochloride: Distinctive global and residue level features. Biochimie 2007; 89:117-34. [PMID: 17029744 DOI: 10.1016/j.biochi.2006.09.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2006] [Accepted: 09/05/2006] [Indexed: 10/24/2022]
Abstract
We present circular dichroism (CD), steady state fluorescence and multidimensional NMR investigations on the equilibrium unfolding of monomeric dynein light chain protein (DLC8) by urea and guanidine hydrochloride (GdnHCl). Quantitative analysis of the CD and fluorescence denaturation curves reveals that urea unfolding is a two-state process, whereas guanidine unfolding is more complex. NMR investigations in the native state and in the near native states created by low denaturant concentrations enabled residue level characterization of the early structural and dynamic perturbations by the two denaturants. Firstly, (15)N transverse relaxation rates in the native state indicate that the regions around N10, Q27, the loop between beta2 and beta4 strands, and K87 at the C-terminal are potential unfolding initiation sites in the protein. Amide and (15)N chemical shift perturbations indicate different accessibilities of the residues along the chain and help identify locations of the early perturbations by the two denaturants. Guanidine and urea are seen to interact at several sites some of which are different in the two cases. Notable among the common interaction site is that around K87 which is in close proximity to W54 on the protein structure, but the interaction modes of the two denaturants are different. The secondary chemical shifts indicate that the structural perturbation by 1M urea is small, compared to that by guanidine which is more encompassing over the length of the chain. The probable (phi, psi) changes at the individual residues have been calculated using the TALOS algorithm. It appears that the helices in the protein are significantly perturbed by guanidine. Further, comparison of the spectral density functions of the native and the two near native states in the two denaturants implicate greater loosening of the structure by guanidine as compared to that by urea, even though the structures are still in the native state ensemble. These differences in the early perturbations of the native state structure and dynamics by the two denaturants might direct the protein along different pathways, as the unfolding progresses on further increasing the denaturant concentration.
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Affiliation(s)
- Amarnath Chatterjee
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, Maharashtra, India
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30
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Kumar A, Srivastava S, Kumar Mishra R, Mittal R, Hosur RV. Residue-level NMR View of the Urea-driven Equilibrium Folding Transition of SUMO-1 (1-97): Native Preferences Do Not Increase Monotonously. J Mol Biol 2006; 361:180-94. [PMID: 16824543 DOI: 10.1016/j.jmb.2006.06.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2006] [Revised: 04/14/2006] [Accepted: 06/02/2006] [Indexed: 11/17/2022]
Abstract
SUMO-1 (1-97) is a crucial protein in the machinery of post-translational modifications. We observed by circular dichroism and fluorescence spectroscopy that urea-induced unfolding of this protein is a complex process with the possibility of occurrence of detectable intermediates along the way. The tertiary structure is completely lost around approximately 4.5 M urea with a transition mid-point at 2.53 M urea, while the secondary structure unfolding seems to show two transitions, with mid-points at 2.42 M and 5.69 M urea. We have elucidated by systematic urea titration, the equilibrium residue level structural and dynamics changes along the entire folding/unfolding transition by multidimensional NMR. With urea dilution, the protein is seen to progressively lose most of the broad beta-domain structural preferences present at 8 M urea, acquire some helical propensities at 5 M urea, and lose some of them again on further dilution of urea. Between 3 M and 2 M urea, the protein starts afresh to acquire native structural features. These observations are contrary to the conventional notion that proteins fold with monotonously increasing native-type preferences. For folding below approximately 3 M urea, the region around the alpha1 helix appears to be a potential folding initiation site. The folding seems to start with a collapse into native-like topologies, at least in parts, and is followed by formation of secondary and tertiary structure, perhaps by cooperative rearrangements. The motional characteristics of the protein show sequence-dependent variation as the concentration of urea is progressively reduced. At the sub-nanosecond level, the features are extremely unusual for denatured states, and only certain segments corresponding to the flexible regions in the native protein display these motions at the different concentrations of urea.
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Affiliation(s)
- Ashutosh Kumar
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Mumbai, India
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31
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Patel S, Chaffotte AF, Amana B, Goubard F, Pauthe E. In vitro denaturation-renaturation of fibronectin. Formation of multimers disulfide-linked and shuffling of intramolecular disulfide bonds. Int J Biochem Cell Biol 2006; 38:1547-60. [PMID: 16697243 DOI: 10.1016/j.biocel.2006.03.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2005] [Revised: 03/08/2006] [Accepted: 03/10/2006] [Indexed: 01/16/2023]
Abstract
It is well established that fibronectin into extracellular matrix undergoes repeated tensions applied by cells, resulting into dramatic structural changes which reflect its elastic properties. However, there is currently no study reporting with precision the consequences of this elasticity on fibronectin structure and conformation. In the present work, we investigated fibronectin structural and conformational reorganization in vitro through a denaturation-renaturation approach. The similarities and differences between "refolded fibronectin" and "native fibronectin" were investigated using various spectroscopic methods, hydrodynamic characterization, molecular imaging and biochemical characterization. In the refolded form, secondary structure elements as well as local tyrosine and tryptophan environment are identical compared to the native form. Interestingly, some differences in global tertiary structure organization and molecular conformation were observed. These differences are due to the reactivity of the two free cysteines, which are buried in the native state but become accessible during the unfolding process. First, oxidation of these residues leading to the formation of intermolecular disulfide bonds results in formation of stabilized multimer. Second, some illegitimate intramolecular disulfide bonds are formed. The presence of iodoacetamide, the sulfhydryl alkylating agent, during the unfolding-refolding process prevents all these events. This study clearly demonstrates that, under near physiological conditions, competitive renaturation pathways occur, involving free cysteines in either multimer formation or intermolecular shuffling of disulfide bonds. These findings might have important implications for future studies and be helpful to develop a deeper understanding of fibronectin morphology.
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Affiliation(s)
- Salima Patel
- Department of Physiology and Biophysics, ERRMECe, Université de Cergy-Pontoise, 95302 Cergy-Pontoise, Cedex, France.
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32
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Mao Y, Schwarzbauer JE. Fibronectin fibrillogenesis, a cell-mediated matrix assembly process. Matrix Biol 2005; 24:389-99. [PMID: 16061370 DOI: 10.1016/j.matbio.2005.06.008] [Citation(s) in RCA: 549] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2005] [Accepted: 06/21/2005] [Indexed: 11/21/2022]
Abstract
The extracellular matrix provides a framework for cell adhesion, supports cell movement, and serves to compartmentalize tissues into functional units. Fibronectin is a core component of many extracellular matrices where it regulates a variety of cell activities through direct interactions with cell surface integrin receptors. Fibronectin is synthesized by many adherent cells which then assemble it into a fibrillar network. The assembly process is integrin-dependent and fibronectin-integrin interactions initiate a step-wise process involving conformational activation of fibronectin outside and organization of the actin cytoskeleton inside. During assembly, fibronectin undergoes conformational changes that expose fibronectin-binding sites and promote intermolecular interactions needed for fibril formation. In this review, the main steps of fibronectin assembly are described and recent studies on fibronectin conformational changes are discussed.
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Affiliation(s)
- Yong Mao
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544-1014, United States
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Muralidhar D, Jobby MK, Krishnan K, Annapurna V, Chary KVR, Jeromin A, Sharma Y. Equilibrium Unfolding of Neuronal Calcium Sensor-1. J Biol Chem 2005; 280:15569-78. [PMID: 15699030 DOI: 10.1074/jbc.m414243200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Neuronal calcium sensor-1 (NCS-1), a Ca(2+)-binding protein of the calcium sensor family, modulates various functions in intracellular signaling pathways. The N-terminal glycine in this protein is myristoylated, which is presumably necessary for its physiological functions. In order to understand the structural role of myristoylation and calcium on conformational stability, we have investigated the equilibrium unfolding and refolding of myristoylated and non-myristoylated NCS-1. The unfolding of these two forms of NCS-1 in the presence of calcium is best characterized by a five-state equilibrium model, and multiple intermediates accumulate during unfolding. Calcium exerts an extrinsic stabilizing effect on both forms of the protein. In the absence of calcium, the stability of both forms is dramatically decreased, and the unfolding follows a four-state equilibrium model. The equilibrium transitions are fully reversible in the presence of calcium. Myristoylation affects the pattern of equilibrium transitions substantially but not the number of intermediates, suggesting a structural role. Our data suggest that myristoylation reduces the stiffening of the protein during initial unfolding in the presence of calcium. The effects of myristoylation are more pronounced when calcium is present, suggesting a relationship between them. Inactivating the third EF-hand motif (E120Q mutant) drastically affects the equilibrium unfolding transitions, and calcium has no effect on these transitions of the mutants. The unfolding transitions of both forms of the mutant are similar to the transitions followed by the apo forms of myristoylated and non-myristoylated NCS-1. These results suggest that the role of myristoylation in unfolding/refolding of the protein is largely dependent on the presence of calcium.
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Krantz BA, Trivedi AD, Cunningham K, Christensen KA, Collier RJ. Acid-induced unfolding of the amino-terminal domains of the lethal and edema factors of anthrax toxin. J Mol Biol 2005; 344:739-56. [PMID: 15533442 DOI: 10.1016/j.jmb.2004.09.067] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2004] [Revised: 09/22/2004] [Accepted: 09/23/2004] [Indexed: 11/22/2022]
Abstract
The two enzymatic components of anthrax toxin, lethal factor (LF) and edema factor (EF), are transported to the cytosol of mammalian cells by the third component, protective antigen (PA). A heptameric form of PA binds LF and/or EF and, under the acidic conditions encountered in endosomes, generates a membrane-spanning pore that is thought to serve as a passageway for these enzymes to enter the cytosol. The pore contains a 14-stranded transmembrane beta-barrel that is too narrow to accommodate a fully folded protein, necessitating that LF and EF unfold, at least partly, in order to pass. Here, we describe the pH-dependence of the unfolding of LF(N) and EF(N), the 30kDa N-terminal PA-binding domains, and minimal translocatable units, of LF and EF. Equilibrium chemical denaturation studies using fluorescence and circular dichroism spectroscopy show that each protein unfolds via a four-state mechanism: N<-->I<-->J<-->U. The acid-induced N-->I transition occurs within the pH range of the endosome (pH 5-6). The I state predominates at lower pH values, and the J and U states are populated significantly only in the presence of denaturant. The I state is compact and has characteristics of a molten globule, as shown by its retention of significant secondary structure and its ability to bind an apolar fluorophore. The N-->I transition leads to an overall 60% increase in buried surface area exposure. The J state is expanded significantly and has diminished secondary structure content. We analyze the different protonation states of LF(N) and EF(N) in terms of a linked equilibrium proton binding model and discuss the implications of our findings for the mechanism of acidic pH-induced translocation of anthrax toxin. Finally, analysis of the structure of the transmembrane beta-barrel of PA shows that it can accommodate alpha-helix, and we suggest that the steric constraints and composition of the lumen may promote alpha-helix formation.
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Affiliation(s)
- Bryan A Krantz
- Department of Microbiology and Molecular Genetics, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115, USA
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