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Boudko SP, Konopka EH, Kim W, Taga Y, Mizuno K, Springer TA, Hudson BG, Moy TI, Lin FY. A recombinant technique for mapping functional sites of heterotrimeric collagen helices: Collagen IV CB3 fragment as a prototype for integrin binding. J Biol Chem 2023; 299:104901. [PMID: 37302550 PMCID: PMC10404678 DOI: 10.1016/j.jbc.2023.104901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/01/2023] [Accepted: 06/05/2023] [Indexed: 06/13/2023] Open
Abstract
Collagen superfamily of proteins is a major component of the extracellular matrix. Defects in collagens underlie the cause of nearly 40 human genetic diseases in millions of people worldwide. Pathogenesis typically involves genetic alterations of the triple helix, a hallmark structural feature that bestows exceptional mechanical resistance to tensile forces and a capacity to bind a plethora of macromolecules. Yet, there is a paramount knowledge gap in understanding the functionality of distinct sites along the triple helix. Here, we present a recombinant technique to produce triple helical fragments for functional studies. The experimental strategy utilizes the unique capacity of the NC2 heterotrimerization domain of collagen IX to drive three α-chain selection and registering the triple helix stagger. For proof of principle, we produced and characterized long triple helical fragments of collagen IV that were expressed in a mammalian system. The heterotrimeric fragments encompassed the CB3 trimeric peptide of collagen IV, which harbors the binding motifs for α1β1 and α2β1 integrins. Fragments were characterized and shown to have a stable triple helix, post-translational modifications, and high affinity and specific binding of integrins. The NC2 technique is a universal tool for the high-yield production of heterotrimeric fragments of collagens. Fragments are suitable for mapping functional sites, determining coding sequences of binding sites, elucidating pathogenicity and pathogenic mechanisms of genetic mutations, and production of fragments for protein replacement therapy.
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Affiliation(s)
- Sergei P Boudko
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Center for Matrix Biology, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, USA.
| | | | - Woojin Kim
- Morphic Therapeutic, Inc, Waltham, Massachusetts, USA
| | - Yuki Taga
- Nippi Research Institute of Biomatrix, Toride, Ibaraki, Japan
| | - Kazunori Mizuno
- Nippi Research Institute of Biomatrix, Toride, Ibaraki, Japan
| | - Timothy A Springer
- Department of Biological Chemistry and Molecular Pharmacology, Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Billy G Hudson
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Center for Matrix Biology, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, USA; Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee, USA; Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee, USA
| | - Terence I Moy
- Morphic Therapeutic, Inc, Waltham, Massachusetts, USA
| | - Fu-Yang Lin
- Morphic Therapeutic, Inc, Waltham, Massachusetts, USA.
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2
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Nanomodulation and nanotherapeutics of tumor-microenvironment. OPENNANO 2022. [DOI: 10.1016/j.onano.2022.100099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Hentzen NB, Islami V, Köhler M, Zenobi R, Wennemers H. A Lateral Salt Bridge for the Specific Assembly of an ABC-Type Collagen Heterotrimer. J Am Chem Soc 2020; 142:2208-2212. [DOI: 10.1021/jacs.9b13037] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Nina B. Hentzen
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093, Zurich, Switzerland
| | - Valdrin Islami
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093, Zurich, Switzerland
| | - Martin Köhler
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093, Zurich, Switzerland
| | - Renato Zenobi
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093, Zurich, Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093, Zurich, Switzerland
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Lalande M, Schwob L, Vizcaino V, Chirot F, Dugourd P, Schlathölter T, Poully J. Direct Radiation Effects on the Structure and Stability of Collagen and Other Proteins. Chembiochem 2019; 20:2972-2980. [DOI: 10.1002/cbic.201900202] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 05/28/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Mathieu Lalande
- CIMAP LaboratoryUMR 6252CEA/CNRS/ENSICAEN/Université de Caen Normandie) Boulevard Becquerel 14070 Caen France
| | - Lucas Schwob
- Helmholtz AssociationDeutsches Elektronen-Synchrotron (DESY) Notkestrasse 85 22607 Hamburg Germany
| | - Violaine Vizcaino
- CIMAP LaboratoryUMR 6252CEA/CNRS/ENSICAEN/Université de Caen Normandie) Boulevard Becquerel 14070 Caen France
| | - Fabien Chirot
- Université Claude Bernard Lyon 1ENS de LyonUMR 5280 Institut des Sciences Analytiques 5, rue de la Doua 69100 Villeurbanne France
| | - Philippe Dugourd
- Université Claude Bernard Lyon 1CNRSUMR 5306 Institut Lumière Matière 10 rue Ada Byron 69622 Villeurbanne Cedex France
| | - Thomas Schlathölter
- Zernike Institute for Advanced MaterialsUniversity of Groningen Nijenborgh 4 9747 AG Groningen Netherlands
| | - Jean‐Christophe Poully
- CIMAP LaboratoryUMR 6252CEA/CNRS/ENSICAEN/Université de Caen Normandie) Boulevard Becquerel 14070 Caen France
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5
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Liang J, Levina A, Jia J, Kappen P, Glover C, Johannessen B, Lay PA. Reactivity and Transformation of Antimetastatic and Cytotoxic Rhodium(III)–Dimethyl Sulfoxide Complexes in Biological Fluids: An XAS Speciation Study. Inorg Chem 2019; 58:4880-4893. [DOI: 10.1021/acs.inorgchem.8b03477] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Jun Liang
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Aviva Levina
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Junteng Jia
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Peter Kappen
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Chris Glover
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Bernt Johannessen
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Peter A. Lay
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
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6
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Whole-exome sequencing analysis reveals co-segregation of a COL20A1 missense mutation in a Pakistani family with striate palmoplantar keratoderma. Genes Genomics 2018; 40:789-795. [DOI: 10.1007/s13258-018-0695-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 04/14/2018] [Indexed: 10/17/2022]
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7
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Stawikowski MJ, Fields GB. Tricine as a convenient scaffold for the synthesis of C-terminally branched collagen-model peptides. Tetrahedron Lett 2018; 59:130-134. [PMID: 29545652 PMCID: PMC5846494 DOI: 10.1016/j.tetlet.2017.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A novel and convenient method for the synthesis of C-terminally branched collagen-model peptides has been achieved using tricine (N-[tris(hydroxymethyl)methyl]glycine) as a branching scaffold and 1,2-diaminoethane or 1,4-diaminobutane as a linker. The peptide sequence was incorporated directly onto the linker and scaffold during solid-phase synthesis without additional manipulations. The resulting branched triple-helical peptides exhibited comparable thermal stabilities to the parent, unbranched sequence, and served as substrates for matrix metalloproteinase-1 (MMP-1). The tricine-based branch reported herein represents the simplest synthetic scaffold for the convenient synthesis of covalently linked homomeric collagen-model triple-helical peptides.
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Affiliation(s)
- Maciej J. Stawikowski
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL 33431
| | - Gregg B. Fields
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL 33431
- The Scripps Research Institute/Scripps Florida, 130 Scripps Way, Jupiter, FL 33458
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8
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Banerjee J, Azevedo HS. Crafting of functional biomaterials by directed molecular self-assembly of triple helical peptide building blocks. Interface Focus 2017; 7:20160138. [PMID: 29147553 PMCID: PMC5665793 DOI: 10.1098/rsfs.2016.0138] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Collagen is the most abundant extracellular matrix protein in the body and has widespread use in biomedical research, as well as in clinics. In addition to difficulties in the production of recombinant collagen due to its high non-natural imino acid content, animal-derived collagen imposes several major drawbacks-variability in composition, immunogenicity, pathogenicity and difficulty in sequence modification-that may limit its use in the practical scenario. However, in recent years, scientists have shifted their attention towards developing synthetic collagen-like materials from simple collagen model triple helical peptides to eliminate the potential drawbacks. For this purpose, it is highly desirable to develop programmable self-assembling strategies that will initiate the hierarchical self-assembly of short peptides into large-scale macromolecular assemblies with recommendable bioactivity. Herein, we tried to elaborate our understanding related to the strategies that have been adopted by few research groups to trigger self-assembly in the triple helical peptide system producing fascinating supramolecular structures. We have also touched upon the major epitopes within collagen that can be incorporated into collagen mimetic peptides for promoting bioactivity.
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Affiliation(s)
| | - Helena S. Azevedo
- School of Engineering and Material Science, Institute of Bioengineering, University of London, Queen Mary, Mile End Road, London E1 4NS, UK
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9
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Hentzen NB, Smeenk LEJ, Witek J, Riniker S, Wennemers H. Cross-Linked Collagen Triple Helices by Oxime Ligation. J Am Chem Soc 2017; 139:12815-12820. [PMID: 28872857 DOI: 10.1021/jacs.7b07498] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Covalent cross-links are crucial for the folding and stability of triple-helical collagen, the most abundant protein in nature. Cross-linking is also an attractive strategy for the development of synthetic collagen-based biocompatible materials. Nature uses interchain disulfide bridges to stabilize collagen trimers. However, their implementation into synthetic collagen is difficult and requires the replacement of the canonical amino acids (4R)-hydroxyproline and proline by cysteine or homocysteine, which reduces the preorganization and thereby stability of collagen triple helices. We therefore explored alternative covalent cross-links that allow for connecting triple-helical collagen via proline residues. Here, we present collagen model peptides that are cross-linked by oxime bonds between 4-aminooxyproline (Aop) and 4-oxoacetamidoproline placed in coplanar Xaa and Yaa positions of neighboring strands. The covalently connected strands folded into hyperstable collagen triple helices (Tm ≈ 80 °C). The design of the cross-links was guided by an analysis of the conformational properties of Aop, studies on the stability and functionalization of Aop-containing collagen triple helices, and molecular dynamics simulations. The studies also show that the aminooxy group exerts a stereoelectronic effect comparable to fluorine and introduce oxime ligation as a tool for the functionalization of synthetic collagen.
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Affiliation(s)
- Nina B Hentzen
- Laboratorium für Organische Chemie, ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Linde E J Smeenk
- Laboratorium für Organische Chemie, ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Jagna Witek
- Laboratorium für Physikalische Chemie, ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Sereina Riniker
- Laboratorium für Physikalische Chemie, ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Helma Wennemers
- Laboratorium für Organische Chemie, ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
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10
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Nanoparticles for modulating tumor microenvironment to improve drug delivery and tumor therapy. Pharmacol Res 2017; 126:97-108. [PMID: 28501517 DOI: 10.1016/j.phrs.2017.05.004] [Citation(s) in RCA: 155] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 04/01/2017] [Accepted: 05/05/2017] [Indexed: 12/18/2022]
Abstract
Tumor microenvironment (TME) plays a critical role in tumorigenesis, tumor invasion and metastasis. TME is composed of stroma, endothelial cells, pericytes, fibroblasts, smooth muscle cells, and immune cells, which is characterized by hypoxia, acidosis, and high interstitial fluid pressure. Due to the important role of TME, we firstly reviewed the composition of TME and discussed the impact of TME on tumor progression, drug and nanoparticle delivery. Next, we reviewed current strategies developed to modulate TME, including modulating tumor vasculature permeability, tumor associated macrophage phenotypes, tumor associated fibroblasts, tumor stroma components, tumor hypoxia, and multiple interventions simultaneously. Also, potential problems and future directions of TME modulation strategy have been discussed.
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11
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Ellison AJ, VanVeller B, Raines RT. Convenient synthesis of collagen-related tripeptides for segment condensation. Biopolymers 2015; 104:674-81. [PMID: 26172437 PMCID: PMC4713359 DOI: 10.1002/bip.22700] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 06/23/2015] [Accepted: 07/04/2015] [Indexed: 11/09/2022]
Abstract
Chromatography is a common step in the solution-phase synthesis of typical peptides, as well as peptide fragments for subsequent coupling on a solid support. Combining known reagents that form readily separable byproducts is shown to eliminate this step, which wastes time and other resources. Specifically, activating carboxyl groups with isobutyl chloroformate or as pentafluorophenyl esters and using N-methyl morpholine as a base enable chromatography-free synthetic routes in which peptide products are isolated from byproducts by facile evaporation, extraction, and trituration. This methodology was used to access tripeptides related to collagen, such as Fmoc-Pro-Pro-Gly-OH and Fmoc-Pro-Hyp(tBu)-Gly-OH, in a purity suitable for solid-phase segment condensation to form collagen mimetic peptides.
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Affiliation(s)
- Aubrey J. Ellison
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI 53706-1322
| | - Brett VanVeller
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI 53706-1322
| | - Ronald T. Raines
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI 53706-1322
- Department of Biochemistry, University of Wisconsin–Madison, 433 Babcock Drive, Madison, WI 53706-1544
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12
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Abstract
In some natural collagen triple helices, cysteine (Cys) residues on neighboring strands are linked by disulfide bonds, enhancing association and maintaining proper register. Similarly, Cys-Cys disulfide bridges have been used to impose specific associations between collagen-mimetic peptides (CMPs). Screening a library of disulfide linkers in silico for compatibility with collagen identifies the disulfide bridge between proximal homocysteine (Hcy) and Cys as conferring much greater stability than a Cys-Cys bridge, but only when Hcy is installed in the Xaa position of the canonical Xaa-Yaa-Gly repeat and Cys is installed in the Yaa position. Experimental evaluation of CMPs that host alternative thiols validates this design: only Hcy-Cys bridges improve triple-helical structure and stability upon disulfide-bond formation. This privileged linker can enhance CMP-based biomaterials and enable previously inaccessible molecular designs.
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Affiliation(s)
- I Caglar Tanrikulu
- Department of Biochemistry and ‡Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States
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13
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Stabilization of collagen-model, triple-helical peptides for in vitro and in vivo applications. Methods Mol Biol 2013; 1081:167-94. [PMID: 24014440 PMCID: PMC4260935 DOI: 10.1007/978-1-62703-652-8_11] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The triple-helical structure of collagen has been accurately reproduced in numerous chemical and recombinant model systems. Triple-helical peptides and proteins have found application for dissecting collagen-stabilizing forces, isolating receptor- and protein-binding sites in collagen, mechanistic examination of collagenolytic proteases, and development of novel biomaterials. Introduction of native-like sequences into triple-helical constructs can reduce the thermal stability of the triple-helix to below that of the physiological environment. In turn, incorporation of nonnative amino acids and/or templates can enhance triple-helix stability. We presently describe approaches by which triple-helical structure can be modulated for use under physiological or near-physiological conditions.
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Abstract
Triple-helical peptides (THPs) have been utilized as collagen models since the 1960s. The original focus for THP-based research was to unravel the structural determinants of collagen. In the last two decades, virtually all aspects of collagen structural biochemistry have been explored with THP models. More specifically, secondary amino acid analogs have been incorporated into THPs to more fully understand the forces that stabilize triple-helical structure. Heterotrimeric THPs have been utilized to better appreciate the contributions of chain sequence diversity on collagen function. The role of collagen as a cell signaling protein has been dissected using THPs that represent ligands for specific receptors. The mechanisms of collagenolysis have been investigated using THP substrates and inhibitors. Finally, THPs have been developed for biomaterial applications. These aspects of THP-based research are overviewed herein.
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Affiliation(s)
- Gregg B Fields
- University of Texas Health Science Center, Department of Biochemistry, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA.
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Boudko SP, Sasaki T, Engel J, Lerch TF, Nix J, Chapman MS, Bächinger HP. Crystal structure of human collagen XVIII trimerization domain: A novel collagen trimerization Fold. J Mol Biol 2009; 392:787-802. [PMID: 19631658 DOI: 10.1016/j.jmb.2009.07.057] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 07/17/2009] [Accepted: 07/18/2009] [Indexed: 11/15/2022]
Abstract
Collagens contain a unique triple-helical structure with a repeating sequence -G-X-Y-, where proline and hydroxyproline are major constituents in X and Y positions, respectively. Folding of the collagen triple helix requires trimerization domains. Once trimerized, collagen chains are correctly aligned and the folding of the triple helix proceeds in a zipper-like fashion. Here we report the isolation, characterization, and crystal structure of the trimerization domain of human type XVIII collagen, a member of the multiplexin family. This domain differs from all other known trimerization domains in other collagens and exhibits a high trimerization potential at picomolar concentrations. Strong chain association and high specificity of binding are needed for multiplexins, which are present at very low levels.
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Affiliation(s)
- Sergei P Boudko
- Research Department of Shriners Hospital for Children, Portland, OR 97239, USA
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Berisio R, De Simone A, Ruggiero A, Improta R, Vitagliano L. Role of side chains in collagen triple helix stabilization and partner recognition. J Pept Sci 2009; 15:131-40. [PMID: 19053070 DOI: 10.1002/psc.1082] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Collagen is a widespread protein family involved in a variety of biological processes. The complexity of collagen and its fibrous nature prevent detailed investigations on the full-length protein. Reductionist approaches conducted by dissecting the protein complexity through the use of model peptides have proved to be quite effective. There are, however, several issues regarding structure-stability relationships, aggregation in higher-order assemblies, and partner recognition that are still extensively investigated. In this review, we discuss the role that side chains play in triple helix stabilization and in partner recognition. On the basis of recent literature data, we show that collagen triple helix stability is the result of the interplay of different factors. As a general trend, interactions established by amino/imino acid side chains within the triple helix scaffold effectively modulate the intrinsic residue propensity for this common structural motif. The use of peptide models has also highlighted the role that side chains play in collagen self-association and in its interactions with receptors. Valuable examples in these fields are illustrated. Finally, future actions required to obtain more detailed information on the structure and the function of this complex protein are also delineated.
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Affiliation(s)
- Rita Berisio
- Istituto di Biostrutture e Bioimmagini, CNR via Mezzocannone 16, I-80134 Napoli, Italy
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Boudko SP, Engel J, Okuyama K, Mizuno K, Bächinger HP, Schumacher MA. Crystal structure of human type III collagen Gly991-Gly1032 cystine knot-containing peptide shows both 7/2 and 10/3 triple helical symmetries. J Biol Chem 2008; 283:32580-9. [PMID: 18805790 DOI: 10.1074/jbc.m805394200] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Type III collagen is a critical collagen that comprises extensible connective tissue such as skin, lung, and the vascular system. Mutations in the type III collagen gene, COL3A1, are associated with the most severe forms of Ehlers-Danlos syndrome. A characteristic feature of type III collagen is the presence of a stabilizing C-terminal cystine knot. Crystal structures of collagen triple helices reported so far contain artificial sequences like (Gly-Pro-Pro)(n) or (Gly-Pro-Hyp)(n). To gain insight into the structural properties exhibited by the natural type III collagen triple helix, we synthesized, crystallized, and determined the structure of a 12-triplet repeating peptide containing the natural type III collagen sequence from residues 991 to 1032 including the C-terminal cystine knot region, to 2.3A resolution. This represents the longest collagen triple helical structure determined to date with a native sequence. Strikingly, the Gly(991)-Gly(1032) structure reveals that the central non-imino acid-containing region adopts 10/3 superhelical properties, whereas the imino acid rich N- and C-terminal regions adhere to a 7/2 superhelical conformation. The structure is consistent with two models for the cystine knot; however, the poor density for the majority of this region suggests that multiple conformations may be adopted. The structure shows that the multiple non-imino acids make several types of direct intrahelical as well as interhelical contacts. The looser superhelical structure of the non-imino acid region of collagen triple helices combined with the extra contacts afforded by ionic and polar residues likely play a role in fibrillar assembly and interactions with other extracellular components.
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Affiliation(s)
- Sergei P Boudko
- Research Department, Shriners Hospital for Children, Portland, Oregon 97239, USA
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18
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Affiliation(s)
- Salvador Ventura
- Institut de Biotecnologia i Biomedicina & Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, Bellaterra, Spain
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