1
|
Chalek K, Soni A, Lorenz CD, Holland GP. Proline-Tyrosine Ring Interactions in Black Widow Dragline Silk Revealed by Solid-State Nuclear Magnetic Resonance and Molecular Dynamics Simulations. Biomacromolecules 2024; 25:1916-1922. [PMID: 38315982 DOI: 10.1021/acs.biomac.3c01351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Selective one-dimensional 13C-13C spin-diffusion solid-state nuclear magnetic resonance (SSNMR) provides evidence for CH/π ring packing interactions between Pro and Tyr residues in 13C-enriched Latrodectus hesperus dragline silk. The secondary structure of Pro-containing motifs in dragline spider silks consistently points to an elastin-like type II β-turn conformation based on 13C chemical shift analysis. 13C-13C spin diffusion measurements as a function of mixing times allow for the measurement of spatial proximity between the Pro and Tyr rings to be ∼0.5-1 nm, supporting strong Pro-Tyr ring interactions that likely occur through a CH/π mechanism. These results are supported by molecular dynamics (MD) simulations and analysis and reveals new insights into the secondary structure and Pro-Tyr ring stacking interactions for one of nature's toughest biomaterials.
Collapse
Affiliation(s)
- Kevin Chalek
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92181-1030, United States
| | - Ashana Soni
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92181-1030, United States
| | - Christian D Lorenz
- Biological Physics & Soft Matter Group, Department of Physics, King's College London, London WC2R 2LS, United Kingdom
| | - Gregory P Holland
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92181-1030, United States
| |
Collapse
|
2
|
Rowe J, Röder K. Chemical bonds in collagen rupture selectively under tensile stress. Phys Chem Chem Phys 2023; 25:2331-2341. [PMID: 36597961 DOI: 10.1039/d2cp05051j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Collagen fibres are the main constituent of the extracellular matrix, and fulfil an important role in the structural stability of living multicellular organisms. An open question is how collagen absorbs pulling forces, and if the applied forces are strong enough to break bonds, what mechanisms underlie this process. As experimental studies on this topic are challenging, simulations are an important tool to further our understanding of these mechanisms. Here, we present pulling simulations of collagen triple helices, revealing the molecular mechanisms induced by tensile stress. At lower forces, pulling alters the configuration of proline residues leading to an effective absorption of applied stress. When forces are strong enough to introduce bond ruptures, these are located preferentially in X-position residues. Reduced backbone flexibility, for example through mutations or cross linking, weakens tensile resistance, leading to localised ruptures around these perturbations. In fibre-like segments, a significant overrepresentation of ruptures in proline residues compared to amino acid contents is observed. This study confirms the important role of proline in the structural stability of collagen, and adds detailed insight into the molecular mechanisms underlying this observation.
Collapse
Affiliation(s)
- James Rowe
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK.
| | - Konstantin Röder
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK.
| |
Collapse
|
3
|
Asakura T, Matsuda H, Naito A, Abe Y. Formylation of Recombinant Spider Silk in Formic Acid and Wet Spinning Studied Using Nuclear Magnetic Resonance and Infrared Spectroscopies. ACS Biomater Sci Eng 2022; 8:2390-2402. [PMID: 35532754 DOI: 10.1021/acsbiomaterials.2c00151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We reported wet spinning of recombinant spider silk protein (RSSP) and formylation of RSSP in formic acid (FA). First, FA was selected as the spinning solvent and the detailed spinning condition was determined. Next, the mechanical property was compared between the RSSP fiber spun after allowing the spinning solution dissolved in FA to stand for 2 days and the fiber spun immediately after being dissolved in FA for 4 h. The tensile strength of the former fiber was lower than the strength of the latter fiber. This difference can be explained by the difference in the degree of formylation as follows. FA is a known formylating agent, although most researchers who prepared silk fiber by wet spinning with FA have not pointed out about formylation. The formylation of the Ser OH group was confirmed by 13C solution nuclear magnetic resonance (NMR), and the time course of formylation of the RSSP film prepared from the FA solution was tracked by Fourier transform infrared spectroscopy. The 13C solid-state NMR spectra were also compared between two kinds of the formylated RSSP fibers and indicated that the packing state was tighter for the latter fiber than the former one, which could explain higher tensile strength of the latter fiber in the dry state. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis indicated that the RSSP sample decomposed gradually with storage time in FA and the decomposition has begun partly even at 2 h after dissolution in FA. The decomposition by formylation seems to have no significant effect on the backbone structure of the RSSP fiber, although the packing of the fiber becomes loose as a whole. Finally, preliminary trial of deformylation of the formylated RSSP fiber was performed.
Collapse
Affiliation(s)
- Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Hironori Matsuda
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Akira Naito
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Yunoske Abe
- Spiber Inc., 234-1 Mizukami, Kakuganji, Tsuruoka, Yamagata 997-0052, Japan
| |
Collapse
|
4
|
Nanda R, Hazan S, Sauer K, Aladin V, Keinan-Adamsky K, Corzilius B, Shahar R, Zaslansky P, Goobes G. Molecular differences in collagen organization and in organic-inorganic interfacial structure of bones with and without osteocytes. Acta Biomater 2022; 144:195-209. [PMID: 35331939 DOI: 10.1016/j.actbio.2022.03.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 03/10/2022] [Accepted: 03/17/2022] [Indexed: 12/22/2022]
Abstract
Bone is a fascinating biomaterial composed mostly of type-I collagen fibers as an organic phase, apatite as an inorganic phase, and water molecules residing at the interfaces between these phases. They are hierarchically organized with minor constituents such as non-collagenous proteins, citrate ions and glycosaminoglycans into a composite structure that is mechanically durable yet contains enough porosity to accommodate cells and blood vessels. The nanometer scale organization of the collagen fibrous structure and the mineral constituents in bone were recently extensively scrutinized. However, molecular details at the lowest hierarchical level still need to be unraveled to better understand the exact atomic-level arrangement of all these important components in the context of the integral structure of the bone. In this report, we unfold some of the molecular characteristics differentiating between two load-bearing (cleithrum) bones, one from sturgeon fish, where the matrix contains osteocytes and one from pike fish where the bone tissue is devoid of these bone cells. Using enhanced solid-state NMR measurements, we underpin disparities in the collagen fibril structure and dynamics, the mineral phases, the citrate content at the organic-inorganic interface and water penetrability in the two bones. These findings suggest that different strategies are undertaken in the erection of the mineral-organic interfaces in various bones characterized by dissimilar osteogenesis or remodeling pathways and may have implications for the mechanical properties of the particular bone. STATEMENT OF SIGNIFICANCE: Bone boasts unique interactions between collagen fibers and mineral phases through interfaces holding together this bio-composite structure. Over evolution, fish have gone from mineralizing their bones aided by certain bone cells called osteocytes, like tetrapod, to mineralization without these cells. Here, we report atomic level differences in collagen fiber cross linking and organization, porosity of the mineral phases and content of citrate molecules at the bio-mineral interface in bones from modern versus ancient fish. The dissimilar structural features may suggest disparate mechanical properties for the two bones. Fundamental level understanding of the organic and inorganic components in bone and the interfacial interactions holding them together is essential for successful bone repair and for treating better tissue pathologies.
Collapse
|
5
|
Asakura T, Matsuda H, Aoki A, Naito A. Acetylation and hydration treatment of recombinant spider silk fiber, and their characterization using 13C NMR spectroscopy. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
6
|
Röder K. The effects of glycine to alanine mutations on the structure of GPO collagen model peptides. Phys Chem Chem Phys 2021; 24:1610-1619. [PMID: 34951417 DOI: 10.1039/d1cp04775b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Collagen proteins are the main constituents of the extracellular matrix (ECM), and fulfil a number of wide-ranging functions, including contributions to the mechanical and biological behaviour of the ECM. Due to the heterogeneous nature of collagen in tissue samples it is difficult to fully explain the experimental observation, and hence the study of shorter model peptides is common place. Here, the computational energy landscape framework is employed to study Gly to Ala mutations in a GPO model peptide. The results show good agreement with the experimental observations for the GPO reference and a triply mutated peptide, demonstrating the validity of the approach. The modelling predicts that changes in structure are moderate and localised, with an increased dynamic in the backbone and alterations to the hydrogen bonding pattern. Two mechanisms for adjusting to the mutations are observed, with potential consequences regarding protein binding. Finally, in line with a hypothesis that proline puckering allows controlled flexibility (Chow et al., Sci. Rep., 2018, 8, 13809), alterations in the puckering preferences are observed in the strained residues surrounding the mutational sites.
Collapse
Affiliation(s)
- Konstantin Röder
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, UK.
| |
Collapse
|
7
|
Xu J, Chen Y, Li X, Lei Y, Shu C, Luo Q, Chen L, Li X. Reconstruction of a Demineralized Dentin Matrix via Rapid Deposition of CaF 2 Nanoparticles In Situ Promotes Dentin Bonding. ACS APPLIED MATERIALS & INTERFACES 2021; 13:51775-51789. [PMID: 34693718 DOI: 10.1021/acsami.1c15787] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Dentin bonding based on a wet-bonding technique is the fundamental technique used daily in clinics for tooth-restoration fixation and clinical treatment of tooth-related diseases. Limited bonding durability led by insufficient adhesive infiltration in the demineralized dentin (DD) matrix is the biggest concern in contemporary adhesive dentistry. This study proposes that the highly hydrated noncollagenous protein (NCP)-formed interfacial microenvironment of the DD matrix is the root cause of this problem. Meanwhile, the endogenous phosphate groups of the NCPs are used as pseudonuclei to rapidly induce the formation of amorphous CaF2 nanoparticles in situ in the interfacial microenvironment. The DD matrix is thus reconstructed into a novel porous structure. It markedly facilitates the infiltration of dentin adhesives in the DD matrix and also endows the DD matrix with anticollapsing capability when water evaporates. Whether using a wet-bonding or air-drying mode, the bonding effectiveness is greatly promoted, with the 12 month bonding strength being about twice that of the corresponding control groups. This suggests that the nanoreinforced DD matrix eliminates the dependence of bonding effectiveness on the moisture status of the DD surface controlled only by experiences of dentists. Consequently, this bonding strategy not only greatly improves bonding durability but also overcomes the technical sensitivity of bonding operations of the total-etched bonding pattern. This exhibits the potential to promote dentin bonding and is of great significance to dentistry.
Collapse
Affiliation(s)
- Jiajia Xu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Yadong Chen
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Xiaojun Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Yuqing Lei
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Chang Shu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Qiaojie Luo
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Lili Chen
- Union Hospital, Tongji Medical College, Department of Stomatology, Huazhong University Science & Technology, 1277 Jiefang Ave., Wuhan 430022, Peoples R. China
| | - Xiaodong Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| |
Collapse
|
8
|
Lucarini M, Sciubba F, Capitani D, Di Cocco ME, D'Evoli L, Durazzo A, Delfini M, Lombardi Boccia G. Role of catechin on collagen type I stability upon oxidation: a NMR approach. Nat Prod Res 2019; 34:53-62. [PMID: 30821504 DOI: 10.1080/14786419.2019.1570509] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The study focuses on the understanding, at molecular level, the mechanism of interaction between protein and flavonoids. Collagen and catechin interactions were investigated by NMR in solution and solid state. The effect of catechin on the stability of collagen to oxidation was also explored. Collagen was treated with two concentrations of catechin solutions. Oxidation was carried out by incubation of collagen solution with three oxidation systems: Fe(II)/H2O2, Cu(II)/H2O2, and NaOCl/H2O2. The effects of oxidation systems were evaluated by high resolution 1 D and 2 D proton spectroscopy and solid state NMR (13C CP MAS) experiments. Interactions between collagen and catechin preferentially occur between catechin B ring and the amino acids Pro and Hyp of collagen. Results showed that both iron and copper oxidation systems were able to interact with collagen by site specific attack. Moreover, catechin protects collagen proline from oxidation by metal/H2O2 systems, preventing copper and iron approach to collagene molecule;this behaviour was more evident for the copper/H2O2 system.
Collapse
Affiliation(s)
| | - Fabio Sciubba
- Department of Chemistry, "Sapienza" University of Rome, Rome, Italy
| | - Donatella Capitani
- Magnetic Resonance Laboratory "Annalaura Segre", Institute of Chemical Methodologies, National Research Council (CNR), Monterotondo (RM), Italy
| | | | - Laura D'Evoli
- CREA - Research Centre for Food and Nutrition, Rome, Italy
| | | | - Maurizio Delfini
- Department of Chemistry, "Sapienza" University of Rome, Rome, Italy
| | | |
Collapse
|
9
|
Chow WY, Forman CJ, Bihan D, Puszkarska AM, Rajan R, Reid DG, Slatter DA, Colwell LJ, Wales DJ, Farndale RW, Duer MJ. Proline provides site-specific flexibility for in vivo collagen. Sci Rep 2018; 8:13809. [PMID: 30218106 PMCID: PMC6138679 DOI: 10.1038/s41598-018-31937-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 08/28/2018] [Indexed: 02/02/2023] Open
Abstract
Fibrillar collagens have mechanical and biological roles, providing tissues with both tensile strength and cell binding sites which allow molecular interactions with cell-surface receptors such as integrins. A key question is: how do collagens allow tissue flexibility whilst maintaining well-defined ligand binding sites? Here we show that proline residues in collagen glycine-proline-hydroxyproline (Gly-Pro-Hyp) triplets provide local conformational flexibility, which in turn confers well-defined, low energy molecular compression-extension and bending, by employing two-dimensional 13C-13C correlation NMR spectroscopy on 13C-labelled intact ex vivo bone and in vitro osteoblast extracellular matrix. We also find that the positions of Gly-Pro-Hyp triplets are highly conserved between animal species, and are spatially clustered in the currently-accepted model of molecular ordering in collagen type I fibrils. We propose that the Gly-Pro-Hyp triplets in fibrillar collagens provide fibril "expansion joints" to maintain molecular ordering within the fibril, thereby preserving the structural integrity of ligand binding sites.
Collapse
Affiliation(s)
- Wing Ying Chow
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK ,0000 0001 0610 524Xgrid.418832.4Present Address: Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) im Forschungsverbund Berlin e.V., Campus Berlin-Buch, Robert-Rössle-Str 10, 13125 Berlin, Germany
| | - Chris J. Forman
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK ,0000 0001 2299 3507grid.16753.36Present Address: Northwestern University, 633 Clark St, Evanston, IL 60208 USA
| | - Dominique Bihan
- 0000000121885934grid.5335.0Department of Biochemistry, University of Cambridge, Downing Site, Cambridge, CB2 1QW UK ,0000 0004 1936 7697grid.22072.35Present Address: University of Calgary, 2500 University Dr. NW, Calgary, Alberta T2N 1N4 Canada
| | - Anna M. Puszkarska
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK
| | - Rakesh Rajan
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK
| | - David G. Reid
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK
| | - David A. Slatter
- 0000 0001 0807 5670grid.5600.3Institute of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, CF14 4XN UK
| | - Lucy J. Colwell
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK
| | - David J. Wales
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK
| | - Richard W. Farndale
- 0000000121885934grid.5335.0Department of Biochemistry, University of Cambridge, Downing Site, Cambridge, CB2 1QW UK
| | - Melinda J. Duer
- 0000000121885934grid.5335.0Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW UK
| |
Collapse
|
10
|
Chow WY, Forman CJ, Bihan D, Puszkarska AM, Rajan R, Reid DG, Slatter DA, Colwell LJ, Wales DJ, Farndale RW, Duer MJ. Proline provides site-specific flexibility for in vivo collagen. Sci Rep 2018. [PMID: 30218106 DOI: 10.1038/s41598‐018‐31937‐x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Fibrillar collagens have mechanical and biological roles, providing tissues with both tensile strength and cell binding sites which allow molecular interactions with cell-surface receptors such as integrins. A key question is: how do collagens allow tissue flexibility whilst maintaining well-defined ligand binding sites? Here we show that proline residues in collagen glycine-proline-hydroxyproline (Gly-Pro-Hyp) triplets provide local conformational flexibility, which in turn confers well-defined, low energy molecular compression-extension and bending, by employing two-dimensional 13C-13C correlation NMR spectroscopy on 13C-labelled intact ex vivo bone and in vitro osteoblast extracellular matrix. We also find that the positions of Gly-Pro-Hyp triplets are highly conserved between animal species, and are spatially clustered in the currently-accepted model of molecular ordering in collagen type I fibrils. We propose that the Gly-Pro-Hyp triplets in fibrillar collagens provide fibril "expansion joints" to maintain molecular ordering within the fibril, thereby preserving the structural integrity of ligand binding sites.
Collapse
Affiliation(s)
- Wing Ying Chow
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.,Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) im Forschungsverbund Berlin e.V., Campus Berlin-Buch, Robert-Rössle-Str 10, 13125, Berlin, Germany
| | - Chris J Forman
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.,Northwestern University, 633 Clark St, Evanston, IL, 60208, USA
| | - Dominique Bihan
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge, CB2 1QW, UK.,University of Calgary, 2500 University Dr. NW, Calgary, Alberta, T2N 1N4, Canada
| | - Anna M Puszkarska
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Rakesh Rajan
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David G Reid
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David A Slatter
- Institute of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, CF14 4XN, UK
| | - Lucy J Colwell
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David J Wales
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Richard W Farndale
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge, CB2 1QW, UK
| | - Melinda J Duer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
| |
Collapse
|
11
|
Dhital B, Gul-E-Noor F, Downing KT, Hirsch S, Boutis GS. Pregnancy-Induced Dynamical and Structural Changes of Reproductive Tract Collagen. Biophys J 2017; 111:57-68. [PMID: 27410734 DOI: 10.1016/j.bpj.2016.05.049] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 05/27/2016] [Accepted: 05/27/2016] [Indexed: 11/16/2022] Open
Abstract
The tissues and organs of the female reproductive tract and pelvic floor undergo significant remodeling and alterations to allow for fetal growth and birth. In this work, we report on a study of the alterations of murine reproductive tract collagen resulting from pregnancy and parturition by spectrophotometry, histology, and (13)C, (2)H nuclear magnetic resonance (NMR). Four different cohorts of rats were investigated that included virgin, multiparous, two- and fourteen-day postpartum primiparous rats. (13)C CPMAS NMR revealed small chemical shift differences across the cohorts. The measured H-C internuclear correlation times indicated differences in dynamics of some motifs. However, the dynamics of the major amino acids, e.g., Gly, remained unaltered with respect to parity. (2)H NMR relaxation measurements revealed an additional water reservoir in the postpartum and multiparous cohorts pointing to redistribution of water due to pregnancy and/or parturition. Spectrophotometric measurements indicated that the collagen content in virgin rats was highest. Histological analysis of the upper vaginal wall indicated a signature of collagen fiber dissociation with smooth muscle and a change in the density of collagen fibers in multiparous rats.
Collapse
Affiliation(s)
- Basant Dhital
- Department of Physics, The Graduate Center, The City University of New York, New York, New York
| | - Farhana Gul-E-Noor
- Department of Physics, Brooklyn College, The City University of New York, Brooklyn, New York
| | - Keith T Downing
- Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York
| | - Shari Hirsch
- Department of Physics, Brooklyn College, The City University of New York, Brooklyn, New York
| | - Gregory S Boutis
- Department of Physics, The Graduate Center, The City University of New York, New York, New York; Department of Physics, Brooklyn College, The City University of New York, Brooklyn, New York.
| |
Collapse
|
12
|
Werner M, Heil A, Rothermel N, Breitzke H, Groszewicz PB, Thankamony AS, Gutmann T, Buntkowsky G. Synthesis and solid state NMR characterization of novel peptide/silica hybrid materials. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 72:73-78. [PMID: 26411982 DOI: 10.1016/j.ssnmr.2015.09.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 09/10/2015] [Accepted: 09/11/2015] [Indexed: 06/05/2023]
Abstract
The successful synthesis and solid state NMR characterization of silica-based organic-inorganic hybrid materials is presented. For this, collagen-like peptides are immobilized on carboxylate functionalized mesoporous silica (COOH/SiOx) materials. A pre-activation of the silica material with TSTU (O-(N-Succinimidyl)-N,N,N',N'-tetramethyluronium tetrafluoroborate) is performed to enable a covalent binding of the peptides to the linker. The success of the covalent immobilization is indicated by the decrease of the (13)C CP-MAS NMR signal of the TSTU moiety. A qualitative distinction between covalently bound and adsorbed peptide is feasible by (15)N CP-MAS Dynamic Nuclear Polarization (DNP). The low-field shift of the (15)N signal of the peptide's N-terminus clearly identifies it as the binding site. The DNP enhancement allows the probing of natural abundance (15)N nuclei, rendering expensive labeling of peptides unnecessary.
Collapse
Affiliation(s)
- Mayke Werner
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Andreas Heil
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Niels Rothermel
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Hergen Breitzke
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Pedro Braga Groszewicz
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Aany Sofia Thankamony
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Torsten Gutmann
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany.
| | - Gerd Buntkowsky
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany.
| |
Collapse
|
13
|
Rai RK, Singh C, Sinha N. Predominant role of water in native collagen assembly inside the bone matrix. J Phys Chem B 2014; 119:201-11. [PMID: 25530228 DOI: 10.1021/jp511288g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Bone is one of the most intriguing biomaterials found in nature consisting of bundles of collagen helixes, hydroxyapatite, and water, forming an exceptionally tough, yet lightweight material. We present here an experimental tool to map water-dependent subtle changes in triple helical assembly of collagen protein in its absolute native environment. Collagen being the most abundant animal protein has been subject of several structural studies in last few decades, mostly on an extracted, overexpressed, and synthesized form of collagen protein. Our method is based on a (1)H detected solid-state nuclear magnetic resonance (ssNMR) experiment performed on native collagen protein inside intact bone matrix. Recent development in (1)H homonuclear decoupling sequences has made it possible to observe specific atomic resolution in a large complex system. The method consists of observing a natural-abundance two-dimensional (2D) (1)H/(13)C heteronuclear correlation (HETCOR) and(1)H double quantum-single quantum (DQ-SQ) correlation ssNMR experiment. The 2D NMR experiment maps three-dimensional assembly of native collagen protein and shows that extracted form of collagen protein is significantly different from protein in the native state. The method also captures native collagen subtle changes (of the order of ∼1.0 Å) due to dehydration and H/D exchange, giving an experimental tool to map small changes. The method has the potential to be of wide applicability to other collagen containing biomaterials.
Collapse
Affiliation(s)
- Ratan Kumar Rai
- Centre of Biomedical Research , SGPGIMS Campus, Raibarelly Road, Lucknow 226014, India
| | | | | |
Collapse
|
14
|
de sa Peixoto P, Roiland C, Thomas D, Briard-Bion V, Le Guellec R, Parayre S, Deutsch SM, Jan G, Guyomarc'h F. Recrystallized S-layer protein of a probiotic Propionibacterium: structural and nanomechanical changes upon temperature or pH shifts probed by solid-state NMR and AFM. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 31:199-208. [PMID: 25479375 DOI: 10.1021/la503735z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Surface protein layers (S layers) are common constituents of the bacterial cell wall and originate from the assembly of strain-dependent surface layer proteins (Slps). These proteins are thought to play important roles in the bacteria's biology and to have very promising technological applications as biomaterials or as part of cell-host cross-talk in probiotic mechanism. The SlpA from Propionibacterium freudenreichii PFCIRM 118 strain was isolated and recrystallized to investigate organization and assembly of the protein using atomic force microscopy and solid-state (1)H and (13)C-nuclear magnetic resonance. SlpA was found to form hexagonal p1 monolayer lattices where the protein exhibited high proportions of disordered regions and of bound water. The lattice structure was maintained, but softened, upon mild heating or acidification, probably in relation with the increasing mobilities of the disordered protein regions. These results gave structural insights on the mobile protein regions exposed by S layer films, upon physiologically relevant changes of their environmental conditions.
Collapse
Affiliation(s)
- Paulo de sa Peixoto
- INRA-AGROCAMPUS OUEST UMR 1253 Science et Technologie du Lait et de l'Œuf, 35042 Rennes, France
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Tulachan B, Meena SK, Rai RK, Mallick C, Kusurkar TS, Teotia AK, Sethy NK, Bhargava K, Bhattacharya S, Kumar A, Sharma RK, Sinha N, Singh SK, Das M. Electricity from the silk cocoon membrane. Sci Rep 2014; 4:5434. [PMID: 24961354 PMCID: PMC4069722 DOI: 10.1038/srep05434] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 06/05/2014] [Indexed: 11/16/2022] Open
Abstract
Silk cocoon membrane (SCM) is an insect engineered structure. We studied the electrical properties of mulberry (Bombyx mori) and non-mulberry (Tussar, Antheraea mylitta) SCM. When dry, SCM behaves like an insulator. On absorbing moisture, it generates electrical current, which is modulated by temperature. The current flowing across the SCM is possibly ionic and protonic in nature. We exploited the electrical properties of SCM to develop simple energy harvesting devices, which could operate low power electronic systems. Based on our findings, we propose that the temperature and humidity dependent electrical properties of the SCM could find applications in battery technology, bio-sensor, humidity sensor, steam engines and waste heat management.
Collapse
Affiliation(s)
- Brindan Tulachan
- Bioelectricity, Green Energy, Physiology & Sensor Group, Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
- These authors contributed equally to this work
| | - Sunil Kumar Meena
- Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
- These authors contributed equally to this work
| | - Ratan Kumar Rai
- Center for Biomedical Research, SGPGIMS Campus, Raebareli Road, Lucknow, UP, 226014, India
| | - Chandrakant Mallick
- Bioelectricity, Green Energy, Physiology & Sensor Group, Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
| | - Tejas Sanjeev Kusurkar
- Bioelectricity, Green Energy, Physiology & Sensor Group, Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
| | - Arun Kumar Teotia
- Department of Biological Sciences and Bioengineering & Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
| | - Niroj Kumar Sethy
- Peptide and Proteomics Unit, Defense Institute Physiology and Allied Sciences, Defense Research Development Organization, Delhi, 110054, India
| | - Kalpana Bhargava
- Peptide and Proteomics Unit, Defense Institute Physiology and Allied Sciences, Defense Research Development Organization, Delhi, 110054, India
| | - Shantanu Bhattacharya
- Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
| | - Ashok Kumar
- Department of Biological Sciences and Bioengineering & Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
| | | | - Neeraj Sinha
- Center for Biomedical Research, SGPGIMS Campus, Raebareli Road, Lucknow, UP, 226014, India
| | - Sushil Kumar Singh
- Functional Materials Group, Solid State Physics Laboratory, Defense Research Development Organization, Delhi, 110054, India
| | - Mainak Das
- Bioelectricity, Green Energy, Physiology & Sensor Group, Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
- Design Program, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India
| |
Collapse
|
16
|
Schiller J, Huster D. New methods to study the composition and structure of the extracellular matrix in natural and bioengineered tissues. BIOMATTER 2014; 2:115-31. [PMID: 23507863 PMCID: PMC3549865 DOI: 10.4161/biom.20866] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The extracellular matrix (ECM) comprises a gel of numerous biopolymers that occurs in a multitude of biological tissues. The ECM provides the basic support and mechanical strength of skeletal tissue and is responsible for shape retention. At the same time, the ECM is responsible for the viscoelastic properties and the elasticity of soft tissues. As expected, there are several important diseases that affect and degenerate the ECM with severe consequences for its properties. Bioengineering is a promising approach to support the regenerative capacity of the body. Unfortunately, the biomechanical properties of bioengineered ECM often only poorly meet the standards of their native counterparts. Many bioengineered tissues are characterized by an increased glycosaminoglycan (GAG) but decreased collagen content. This leads to an enhanced water content that strongly alters the viscoelastic and thus the biomechanical properties. Therefore, compositional analysis is important to estimate the tissue quality. We will show that nuclear magnetic resonance (NMR) spectroscopy and soft-ionization mass spectrometry (MS) represent useful techniques for ECM research both in natural and bioengineered tissues. Both methods are strongly complimentary: while MS techniques such as matrix-assisted laser desorption and ionization (MALDI) are excellent and very sensitive analytical tools to determine the collagen and the GAG contents of tissues, NMR spectroscopy provides insight into the molecular architecture of the ECM, its dynamics and other important parameters such as the water content of the tissue as well as the diffusion of molecules within the ECM.
Collapse
Affiliation(s)
- Jürgen Schiller
- University of Leipzig, Medical Faculty, Institute of Medical Physics and Biophysics, Leipzig, Germany.
| | | |
Collapse
|
17
|
Rai RK, Barbhuyan T, Singh C, Mittal M, Khan MP, Sinha N, Chattopadhyay N. Total water, phosphorus relaxation and inter-atomic organic to inorganic interface are new determinants of trabecular bone integrity. PLoS One 2013; 8:e83478. [PMID: 24386209 PMCID: PMC3875436 DOI: 10.1371/journal.pone.0083478] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 11/12/2013] [Indexed: 12/14/2022] Open
Abstract
Bone is the living composite biomaterial having unique structural property. Presently, there is a considerable gap in our understanding of bone structure and composition in the native state, particularly with respect to the trabecular bone, which is metabolically more active than cortical bones, and is readily lost in post-menopausal osteoporosis. We used solid-state nuclear magnetic resonance (NMR) to compare trabecular bone structure and composition in the native state between normal, bone loss and bone restoration conditions in rat. Trabecular osteopenia was induced by lactation as well as prolonged estrogen deficiency (bilateral ovariectomy, Ovx). Ovx rats with established osteopenia were administered with PTH (parathyroid hormone, trabecular restoration group), and restoration was allowed to become comparable to sham Ovx (control) group using bone mineral density (BMD) and µCT determinants. We used a technique combining (1)H NMR spectroscopy with (31)P and (13)C to measure various NMR parameters described below. Our results revealed that trabecular bones had diminished total water content, inorganic phosphorus NMR relaxation time (T1) and space between the collagen and inorganic phosphorus in the osteopenic groups compared to control, and these changes were significantly reversed in the bone restoration group. Remarkably, bound water was decreased in both osteopenic and bone restoration groups compared to control. Total water and T1 correlated strongly with trabecular bone density, volume, thickness, connectivity, spacing and resistance to compression. Bound water did not correlate with any of the microarchitectural and compression parameters. We conclude that total water, T1 and atomic space between the crystal and organic surface are altered in the trabecular bones of osteopenic rats, and PTH reverses these parameters. Furthermore, from these data, it appears that total water and T1 could serve as trabecular surrogates of micro-architecture and compression strength.
Collapse
Affiliation(s)
- Ratan Kumar Rai
- Centre of Biomedical Research, SGPGIMS Campus, Lucknow, India
| | - Tarun Barbhuyan
- Division of Endocrinology and Center for Research on Anabolic Skeletal Targets in Health and Illness (ASTHI), CSIR-Central Drug Research Institute, Jankipuram Extension, Lucknow, India
| | - Chandan Singh
- Centre of Biomedical Research, SGPGIMS Campus, Lucknow, India
| | - Monika Mittal
- Division of Endocrinology and Center for Research on Anabolic Skeletal Targets in Health and Illness (ASTHI), CSIR-Central Drug Research Institute, Jankipuram Extension, Lucknow, India
| | - Mohd. Parvez Khan
- Division of Endocrinology and Center for Research on Anabolic Skeletal Targets in Health and Illness (ASTHI), CSIR-Central Drug Research Institute, Jankipuram Extension, Lucknow, India
| | - Neeraj Sinha
- Centre of Biomedical Research, SGPGIMS Campus, Lucknow, India
| | - Naibedya Chattopadhyay
- Division of Endocrinology and Center for Research on Anabolic Skeletal Targets in Health and Illness (ASTHI), CSIR-Central Drug Research Institute, Jankipuram Extension, Lucknow, India
| |
Collapse
|
18
|
De Sa Peixoto P, Laurent G, Azaïs T, Mosser G. Solid-state NMR study reveals collagen I structural modifications of amino acid side chains upon fibrillogenesis. J Biol Chem 2013; 288:7528-7535. [PMID: 23341452 DOI: 10.1074/jbc.m112.390146] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In vivo, collagen I, the major structural protein in human body, is found assembled into fibrils. In the present work, we study a high concentrated collagen sample in its soluble, fibrillar, and denatured states using one and two dimensional {(1)H}-(13)C solid-state NMR spectroscopy. We interpret (13)C chemical shift variations in terms of dihedral angle conformation changes. Our data show that fibrillogenesis increases the side chain and backbone structural complexity. Nevertheless, only three to five rotameric equilibria are found for each amino acid residue, indicating a relatively low structural heterogeneity of collagen upon fibrillogenesis. Using side chain statistical data, we calculate equilibrium constants for a great number of amino acid residues. Moreover, based on a (13)C quantitative spectrum, we estimate the percentage of residues implicated in each equilibrium. Our data indicate that fibril formation greatly affects hydroxyproline and proline prolyl pucker ring conformation. Finally, we discuss the implication of these structural data and propose a model in which the attractive force of fibrillogenesis comes from a structural reorganization of 10 to 15% of the amino acids. These results allow us to further understand the self-assembling process and fibrillar structure of collagen.
Collapse
Affiliation(s)
- Paulo De Sa Peixoto
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR 7574 Université Pierre et Marie Curie (UPMC)/Centre National de La Recherche Scientifique (CNRS)/Collège de France, UPMC, 4 place Jussieu, 75005 Paris, France
| | - Guillaume Laurent
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR 7574 Université Pierre et Marie Curie (UPMC)/Centre National de La Recherche Scientifique (CNRS)/Collège de France, UPMC, 4 place Jussieu, 75005 Paris, France
| | - Thierry Azaïs
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR 7574 Université Pierre et Marie Curie (UPMC)/Centre National de La Recherche Scientifique (CNRS)/Collège de France, UPMC, 4 place Jussieu, 75005 Paris, France
| | - Gervaise Mosser
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR 7574 Université Pierre et Marie Curie (UPMC)/Centre National de La Recherche Scientifique (CNRS)/Collège de France, UPMC, 4 place Jussieu, 75005 Paris, France.
| |
Collapse
|
19
|
Arnold AA, Byette F, Séguin-Heine MO, LeBlanc A, Sleno L, Tremblay R, Pellerin C, Marcotte I. Solid-State NMR Structure Determination of Whole Anchoring Threads from the Blue Mussel Mytilus edulis. Biomacromolecules 2012; 14:132-41. [DOI: 10.1021/bm301493u] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Alexandre A. Arnold
- Department of Chemistry, Université du Québec à Montréal, P.O. Box
8888, Downtown Station, Montreal, Canada H3C 3P8
| | - Frédéric Byette
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Downtown Station, Montréal, Québec,
Canada H3C 3J7
| | - Marc-Olivier Séguin-Heine
- Department of Chemistry, Université du Québec à Montréal, P.O. Box
8888, Downtown Station, Montreal, Canada H3C 3P8
| | - André LeBlanc
- Department of Chemistry, Université du Québec à Montréal, P.O. Box
8888, Downtown Station, Montreal, Canada H3C 3P8
| | - Lekha Sleno
- Department of Chemistry, Université du Québec à Montréal, P.O. Box
8888, Downtown Station, Montreal, Canada H3C 3P8
| | - Réjean Tremblay
- Institut des Sciences
de la Mer de Rimouski, Université du Québec à Rimouski, 310 allée
des Ursulines, Rimouski, Canada G5L 3A1
| | - Christian Pellerin
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Downtown Station, Montréal, Québec,
Canada H3C 3J7
| | - Isabelle Marcotte
- Department of Chemistry, Université du Québec à Montréal, P.O. Box
8888, Downtown Station, Montreal, Canada H3C 3P8
| |
Collapse
|
20
|
Some aspects of the NMR chemical shift/structure correlation in the structural characterization of polymers and biopolymers. Polym J 2012. [DOI: 10.1038/pj.2012.95] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Weber F, Böhme J, Scheidt HA, Gründer W, Rammelt S, Hacker M, Schulz-Siegmund M, Huster D. 31P and 13C solid-state NMR spectroscopy to study collagen synthesis and biomineralization in polymer-based bone implants. NMR IN BIOMEDICINE 2012; 25:464-75. [PMID: 22351643 DOI: 10.1002/nbm.1649] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 09/16/2010] [Accepted: 10/31/2010] [Indexed: 05/24/2023]
Abstract
A combination of solid-state NMR spectroscopy and MRI was used to evaluate the formation of extracellular matrix in poly(D,L-lactide-co-glycolide) (PLGA) bone implants. Porous PLGA scaffolds were implanted into rat tibiae and analysed after 2, 4 or 8 weeks. MRI clearly delineated the implants within the cancellous bone. Differences in the trabecular structure of the implanted material and native bone were demonstrated. In addition, implants were analyzed by solid-state NMR spectroscopy under magic angle spinning. (13)C NMR spectra showed the unambiguous signature of collagen formed in the scaffolds, but also the characteristic signals of the PLGA matrix, indicating that resorption was not complete after 8 weeks. Furthermore, (31)P NMR spectroscopy detected the inorganic component of the matrix, which is composed of bioapatite. (31)P NMR spectra were quantified and this analysis revealed that the amount of inorganic extracellular matrix formed de novo was significantly lower than in native bone. This demonstrates that solid-state NMR spectroscopy, in particular in combination with MRI, can provide useful information on the composition and structure of the extracellular matrix, and serve as a tool to evaluate the quality of tissue engineering strategies.
Collapse
Affiliation(s)
- Franziska Weber
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Niu LN, Jiao K, Qi YP, Yiu CKY, Ryou H, Arola DD, Chen JH, Breschi L, Pashley DH, Tay FR. Infiltration of Silica Inside Fibrillar Collagen. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105114] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
23
|
Niu LN, Jiao K, Qi YP, Yiu CKY, Ryou H, Arola DD, Chen JH, Breschi L, Pashley DH, Tay FR. Infiltration of silica inside fibrillar collagen. Angew Chem Int Ed Engl 2011; 50:11688-91. [PMID: 21983995 DOI: 10.1002/anie.201105114] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Indexed: 11/08/2022]
Affiliation(s)
- Li-na Niu
- School of Stomatology, Fourth Military Medical University, Xi'an, 710032, PR China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Spiess K, Ene R, Keenan CD, Senker J, Kremer F, Scheibel T. Impact of initial solvent on thermal stability and mechanical properties of recombinant spider silk films. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11700a] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
25
|
Creager MS, Jenkins JE, Thagard-Yeaman LA, Brooks AE, Jones JA, Lewis RV, Holland GP, Yarger JL. Solid-state NMR comparison of various spiders' dragline silk fiber. Biomacromolecules 2010; 11:2039-43. [PMID: 20593757 DOI: 10.1021/bm100399x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Major ampullate (dragline) spider silk is a coveted biopolymer due to its combination of strength and extensibility. The dragline silk of different spiders have distinct mechanical properties that can be qualitatively correlated to the protein sequence. This study uses amino acid analysis and carbon-13 solid-state NMR to compare the molecular composition, structure, and dynamics of major ampullate dragline silk of four orb-web spider species ( Nephila clavipes , Araneus gemmoides , Argiope aurantia , and Argiope argentata ) and one cobweb species ( Latrodectus hesperus ). The mobility of the protein backbone and amino acid side chains in water exposed silk fibers is shown to correlate to the proline content. This implies that regions of major ampullate spidroin 2 protein, which is the only dragline silk protein with any significant proline content, become significantly hydrated in dragline spider silk.
Collapse
Affiliation(s)
- Melinda S Creager
- Department of Molecular Biology and Macromolecular Core Facility, University of Wyoming, Laramie, Wyoming 82071, USA
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Jenkins JE, Creager MS, Butler EB, Lewis RV, Yarger JL, Holland GP. Solid-state NMR evidence for elastin-like beta-turn structure in spider dragline silk. Chem Commun (Camb) 2010; 46:6714-6. [PMID: 20733981 DOI: 10.1039/c0cc00829j] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional homo- and heteronuclear solid-state MAS NMR experiments on (13)C/(15)N-proline labeled Argiope aurantia dragline silk provide evidence for an elastin-like beta-turn structure for the repetitive Gly-Pro-Gly-X-X motif prevalent in major ampullate spidroin 2 (MaSp2).
Collapse
Affiliation(s)
- Janelle E Jenkins
- Department of Chemistry and Biochemistry, Magnetic Resonance Research Center, Arizona State University, Tempe, AZ 85287, USA
| | | | | | | | | | | |
Collapse
|
27
|
Saitô H, Ando I, Ramamoorthy A. Chemical shift tensor - the heart of NMR: Insights into biological aspects of proteins. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2010; 57:181-228. [PMID: 20633363 PMCID: PMC2905606 DOI: 10.1016/j.pnmrs.2010.04.005] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 04/26/2010] [Indexed: 05/19/2023]
Affiliation(s)
- Hazime Saitô
- Department of Life Science, Himeji Institute of Technology, University of Hyogo, Kamigori, Hyog, 678-1297, Japan
| | - Isao Ando
- Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-0033, Japan
| | - Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109-1055, USA
| |
Collapse
|
28
|
Zhu P, Xu J, Sahar N, Morris MD, Kohn DH, Ramamoorthy A. Time-resolved dehydration-induced structural changes in an intact bovine cortical bone revealed by solid-state NMR spectroscopy. J Am Chem Soc 2010; 131:17064-5. [PMID: 19894735 DOI: 10.1021/ja9081028] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding the structure and structural changes of bone, a highly heterogeneous material with a complex hierarchical architecture, continues to be a significant challenge even for high-resolution solid-state NMR spectroscopy. While it is known that dehydration affects mechanical properties of bone by decreasing its strength and toughness, the underlying structural mechanism at the atomic level is unknown. Solid-state NMR spectroscopy, controlled dehydration, and H/D exchange were used for the first time to reveal the structural changes of an intact piece of bovine cortical bone. (1)H spectra were used to monitor the dehydration of the bone inside the rotor, and high-resolution (13)C chemical shift spectra obtained under magic-angle spinning were used evaluate the dehydration-induced conformational changes in the bone. The experiments revealed the slow denaturation of collagen due to dehydration while the trans-Xaa-Pro conformation in collagen remained unchanged. Our results suggest that glycosaminoglycans in the collagen fiber and mineral interface may chelate with a Ca(2+) ion present on the surface of the mineral through sulfate or carboxylate groups. These results provide insights into the role of water molecules in the bone structure and shed light on the relationship between the structure and mechanics of bone.
Collapse
Affiliation(s)
- Peizhi Zhu
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
| | | | | | | | | | | |
Collapse
|
29
|
Holland GP, Cherry BR, Jenkins JE, Yarger JL. Proton-detected heteronuclear single quantum correlation NMR spectroscopy in rigid solids with ultra-fast MAS. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2010; 202:64-71. [PMID: 19857977 PMCID: PMC2818250 DOI: 10.1016/j.jmr.2009.09.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 09/22/2009] [Accepted: 09/30/2009] [Indexed: 05/04/2023]
Abstract
In this article, we show the potential for utilizing proton-detected heteronuclear single quantum correlation (HSQC) NMR in rigid solids under ultra-fast magic angle spinning (MAS) conditions. The indirect detection of carbon-13 from coupled neighboring hydrogen nuclei provides a sensitivity enhancement of 3- to 4-fold in crystalline amino acids over direct-detected versions. Furthermore, the sensitivity enhancement is shown to be significantly larger for disordered solids that display inhomogeneously broadened carbon-13 spectra. Latrodectus hesperus (Black Widow) dragline silk is given as an example where the sample is mass-limited and the sensitivity enhancement for the proton-detected experiment is 8- to 13-fold. The ultra-fast MAS proton-detected HSQC solid-state NMR technique has the added advantage that no proton homonuclear decoupling is applied during the experiment. Further, well-resolved, indirectly observed carbon-13 spectra can be obtained in some cases without heteronuclear proton decoupling.
Collapse
|
30
|
Bardet M, Gerbaud G, Le Pape L, Hediger S, Trân QK, Boumlil N. Nuclear Magnetic Resonance and Electron Paramagnetic Resonance as Analytical Tools To Investigate Structural Features of Archaeological Leathers. Anal Chem 2009; 81:1505-11. [DOI: 10.1021/ac802052a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michel Bardet
- Laboratoire de Résonances Magnétiques, INAC, SCIB, Laboratoire de Chimie et Biologie des Métaux, iRTSV, ARC-Nucléart, CEA, F-38054 Grenoble, France, and Laboratoire de Chimie (UMR 5182 CNRS/ENS), Laboratoire de Recherche Conventionné du CEA (DSM-04-32), Ecole Normale Supérieure de Lyon, F-69364, France
| | - Guillaume Gerbaud
- Laboratoire de Résonances Magnétiques, INAC, SCIB, Laboratoire de Chimie et Biologie des Métaux, iRTSV, ARC-Nucléart, CEA, F-38054 Grenoble, France, and Laboratoire de Chimie (UMR 5182 CNRS/ENS), Laboratoire de Recherche Conventionné du CEA (DSM-04-32), Ecole Normale Supérieure de Lyon, F-69364, France
| | - Laurent Le Pape
- Laboratoire de Résonances Magnétiques, INAC, SCIB, Laboratoire de Chimie et Biologie des Métaux, iRTSV, ARC-Nucléart, CEA, F-38054 Grenoble, France, and Laboratoire de Chimie (UMR 5182 CNRS/ENS), Laboratoire de Recherche Conventionné du CEA (DSM-04-32), Ecole Normale Supérieure de Lyon, F-69364, France
| | - Sabine Hediger
- Laboratoire de Résonances Magnétiques, INAC, SCIB, Laboratoire de Chimie et Biologie des Métaux, iRTSV, ARC-Nucléart, CEA, F-38054 Grenoble, France, and Laboratoire de Chimie (UMR 5182 CNRS/ENS), Laboratoire de Recherche Conventionné du CEA (DSM-04-32), Ecole Normale Supérieure de Lyon, F-69364, France
| | - Quôc-Khôi Trân
- Laboratoire de Résonances Magnétiques, INAC, SCIB, Laboratoire de Chimie et Biologie des Métaux, iRTSV, ARC-Nucléart, CEA, F-38054 Grenoble, France, and Laboratoire de Chimie (UMR 5182 CNRS/ENS), Laboratoire de Recherche Conventionné du CEA (DSM-04-32), Ecole Normale Supérieure de Lyon, F-69364, France
| | - Nébia Boumlil
- Laboratoire de Résonances Magnétiques, INAC, SCIB, Laboratoire de Chimie et Biologie des Métaux, iRTSV, ARC-Nucléart, CEA, F-38054 Grenoble, France, and Laboratoire de Chimie (UMR 5182 CNRS/ENS), Laboratoire de Recherche Conventionné du CEA (DSM-04-32), Ecole Normale Supérieure de Lyon, F-69364, France
| |
Collapse
|
31
|
Nunes TG, Polido M, Amorim A, Nunes SG, Toledano M. Multinuclear magnetic resonance studies on the chemical interaction of a self-etching adhesive with radicular and coronal human dentin. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2007; 18:2093-9. [PMID: 17562132 DOI: 10.1007/s10856-007-3148-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2005] [Accepted: 08/21/2006] [Indexed: 05/15/2023]
Abstract
This study presents evidence at molecular level for the chemical interaction between human dentin from different tooth regions and a monomer with phosphate groups, incorporated in the formulation of a simplified adhesive system. Because dentin was observed as a powder, previous verification was obtained for an eventual collagen denaturation due to the grinding process. The presence of chemical bonds involving coronal (CD) or radicular dentin (RD) was investigated using multinuclear magnetic resonance (MR) techniques. Narrow signals were identified in the carbon magic angle spinning (MAS) spectra of CD and RD treated with the adhesive, which were assigned to methylenic groups in methacryloyloxydecyl dihydrogen phosphate (MDP) bound to hydroxyapatite Ca2+; 1H spectra of the adhesive components and treated dentin, in ethanol, support this conclusion. (31)P MAS spectra obtained from both dentin regions present additional shielding and broadening effects subsequent to application and photopolymerization of the adhesive, which were higher for CD. Multinuclear MR studies provided evidence for the interaction of the adhesive with dentin, which involves hydroxyapatite and is stronger for CD than for RD, but no direct proof was obtained on bonding to collagen.
Collapse
Affiliation(s)
- Teresa G Nunes
- Departamento de Engenharia de Materiais/IST e ICTPOL/IST, Av. Rovisco Pais 1, Lisboa 1049-001, Portugal.
| | | | | | | | | |
Collapse
|
32
|
Saitô H, Naito A. NMR studies on fully hydrated membrane proteins, with emphasis on bacteriorhodopsin as a typical and prototype membrane protein. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2007; 1768:3145-61. [PMID: 17964534 DOI: 10.1016/j.bbamem.2007.08.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Revised: 08/24/2007] [Accepted: 08/29/2007] [Indexed: 11/30/2022]
Abstract
The 3D structures or dynamic feature of fully hydrated membrane proteins are very important at ambient temperature, in relation to understanding their biological activities, although their data, especially from the flexible portions such as surface regions, are unavailable from X-ray diffraction or cryoelectron microscope at low temperature. In contrast, high-resolution solid-state NMR spectroscopy has proved to be a very convenient alternative means to be able to reveal their dynamic structures. To clarify this problem, we describe here how we are able to reveal such structures and dynamic features, based on intrinsic probes from high-resolution solid-state NMR studies on bacteriorhodopsin (bR) as a typical membrane protein in 2D crystal, regenerated preparation in lipid bilayer and detergents. It turned out that their dynamic features are substantially altered upon their environments where bR is present. We further review NMR applications to study structure and dynamics of a variety of membrane proteins, including sensory rhodopsin, rhodopsin, photoreaction centers, diacylglycerol kinases, etc.
Collapse
Affiliation(s)
- Hazime Saitô
- Center for Quantum Life Sciences, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
| | | |
Collapse
|
33
|
Schulz J, Pretzsch M, Khalaf I, Deiwick A, Scheidt HA, Salis-Soglio G, Bader A, Huster D. Quantitative monitoring of extracellular matrix production in bone implants by 13C and 31P solid-state nuclear magnetic resonance spectroscopy. Calcif Tissue Int 2007; 80:275-85. [PMID: 17401595 DOI: 10.1007/s00223-007-9007-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2006] [Accepted: 01/17/2007] [Indexed: 10/23/2022]
Abstract
We used (31)P and (13)C solid-state nuclear magnetic resonance (NMR) spectroscopy to detect and analyze the major organic and inorganic components (collagen type I and bioapatite) in natural rabbit bone and beta-tricalcium phosphate implants loaded with osteogenically differentiated mesenchymal stem cells. High-resolution solid-state NMR spectra were obtained using the magic-angle spinning (MAS) technique. The (31)P NMR spectra of bone specimens showed a single line characteristic of bone calcium phosphate. (13)C cross-polarization (CP) MAS NMR spectra of bone exhibited the characteristic signatures of collagen type I with good resolution for all major amino acids in collagen. Quantitative measurements of (13)C-(1)H dipolar couplings indicated that the collagen segments are very rigid, undergoing only small amplitude fluctuations with correlation times in the nanosecond range. In contrast, directly polarized (13)C MAS NMR spectra of rabbit bone were dominated by signals of highly mobile triglycerides. These quantitative investigations of natural bone may provide the basis for a quality control of various osteoinductive bone substitutes. We studied the formation of extracellular bone matrix in artificial mesenchymal stem cell-loaded beta-tricalcium phosphate matrices that were implanted into the femoral condyle of rabbits. The NMR spectra of these bone grafts were acquired 3 months after implantation. In the (31)P NMR spectra, beta-tricalcium phosphate and bone calcium phosphate could be distinguished quantitatively, allowing recording of the formation of the natural bone matrix. Further, (13)C CPMAS allowed detection of collagen type I that had been produced in the implants. Comparison with the spectroscopic data from natural bone allowed assessment of the quality of the bone substitute material.
Collapse
Affiliation(s)
- J Schulz
- Institute of Medical Physics and Biophysics, University of Leipzig, D-04107, Leipzig, Germany
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Marcotte I, van Beek JD, Meier BH. Molecular Disorder and Structure of Spider Dragline Silk Investigated by Two-Dimensional Solid-State NMR Spectroscopy. Macromolecules 2007. [DOI: 10.1021/ma062452n] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Beat H. Meier
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
| |
Collapse
|
35
|
Xiao Y, Guo M, Parker K, Hutson MS. Wavelength-dependent collagen fragmentation during mid-IR laser ablation. Biophys J 2006; 91:1424-32. [PMID: 16714345 PMCID: PMC1518642 DOI: 10.1529/biophysj.106.084616] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mid-infrared free-electron lasers have proven adept in surgical applications. When tuned to wavelengths between 6 and 7 microm, such lasers remove defined volumes of soft tissue with very little collateral damage. Previous attempts to explain the wavelength-dependence of collateral damage have invoked a wavelength-dependent loss of protein structural integrity. However, the molecular nature of this structural failure has been heretofore ill-defined. In this report, we evaluate several candidates for the relevant transition by analyzing the nonvolatile debris ejected during ablation. Porcine corneas were ablated with a free-electron laser tuned to 2.77 or 6.45 microm-wavelengths with matched absorption coefficients for hydrated corneas that respectively target either tissue water or protein. The debris ejected during these ablations was characterized via gel electrophoresis, as well as Fourier transform infrared spectroscopy, micro-Raman and 13C-NMR spectroscopy. We find that high-fluence (240 J/cm2) ablation at 6.45 microm, but not at 2.77 microm, leads to protein fragmentation accompanied by the accumulation of nitrile and alkyne species. The candidate transition most consistent with these observations is scission of the collagen protein backbone at N-alkylamide bonds. Identifying this transition is a key step toward understanding the observed wavelength-dependence of collateral damage in mid-infrared laser ablation.
Collapse
Affiliation(s)
- Yaowu Xiao
- Department of Physics & Astronomy and Vanderbilt Institute for Integrative Biosystem Research & Education, Vanderbilt University, Nashville, Tennessee, USA
| | | | | | | |
Collapse
|
36
|
Asakura T, Yang M, Kawase T, Nakazawa Y. 13C Solid-State NMR Study of Structural Heterogeneity in Peptides Containing Both Polyalanine and Repeated GGA Sequences as a Local Structural Model of Nephila clavipes Dragline Silk (Spidroin 1). Macromolecules 2005. [DOI: 10.1021/ma047660z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| | - Mingying Yang
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| | - Taiji Kawase
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| | - Yasumoto Nakazawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| |
Collapse
|
37
|
Abstract
Historical collagen-based parchments have been studied by solid-state NMR. In addition, new parchment (produced according to traditional methods) and gelatin from bovine skin were also studied. Wideline 1H and MAS 13C measurements were carried out directly on intact parchments. A simple approach is proposed for evaluation of the extent of parchment degradation based on the linewidth changes in the 13C CPMAS spectra relative to new parchment and gelatin. Structural (bound) water content was estimated from wideline 1H NMR lineshape and relaxation time measurements. It was found that the relative water content in parchments correlates linearly with 13C MAS linewidths. Its decrease on parchment degradation indicates that structural water molecules are of primary importance in stabilizing higher order collagen structures. Backbone and side chain dynamics of collagen in parchments were compared to those of gelatin based on the 13C dipolar-dephased experiments. Carbonyl 13C chemical shift anisotropies were measured to deduce the geometry of the collagen backbone motion. Unlike previous studies, we found that the collagen backbone motion is similar to that found in other proteins and occurs primarily via small-angle librations about internal bond directions.
Collapse
Affiliation(s)
- Abil E Aliev
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ United Kingdom.
| |
Collapse
|
38
|
Hong M, Isailovic D, McMillan RA, Conticello VP. Structure of an elastin-mimetic polypeptide by solid-state NMR chemical shift analysis. Biopolymers 2003; 70:158-68. [PMID: 14517905 DOI: 10.1002/bip.10431] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The conformation of an elastin-mimetic recombinant protein, [(VPGVG)4(VPGKG)]39, is investigated using solid-state NMR spectroscopy. The protein is extensively labeled with 13C and 15N, and two-dimensional 13C-13C and 15N-13C correlation experiments were carried out to resolve and assign the isotropic chemical shifts of the various sites. The Pro 15N, 13Calpha, and 13Cbeta isotropic shifts, and the Gly-3 Calpha isotropic and anisotropic chemical shifts support the predominance of type-II beta-turn structure at the Pro-Gly pair but reject a type-I beta-turn. The Val-1 preceding Pro adopts mostly beta-sheet torsion angles, while the Val-4 chemical shifts are intermediate between those of helix and sheet. The protein exhibits a significant conformational distribution, shown by the broad line widths of the 15N and 13C spectra. The average chemical shifts of the solid protein are similar to the values in solution, suggesting that the low-hydration polypeptide maintains the same conformation as in solution. The ability to measure these conformational restraints by solid-state NMR opens the possibility of determining the detailed structure of this class of fibrous proteins through torsion angles and distances.
Collapse
Affiliation(s)
- M Hong
- Department of Chemistry, Iowa State University, Ames, IA 50011, USA.
| | | | | | | |
Collapse
|
39
|
Kumashiro KK, Kurano TL, Niemczura WP, Martino M, Tamburro AM. 13C CPMAS NMR studies of the elastin-like polypeptide (LGGVG)n. Biopolymers 2003; 70:221-6. [PMID: 14517910 DOI: 10.1002/bip.10470] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The elucidation of structure-function relationships in insoluble elastin is often approached using elastin-like polypeptides. In this manner, the characterization of the different regions in this extensive biopolymer may be facilitated in a "piece-wise" manner. Our solid-state NMR experiments indicate that (LGGVG)n has structural similarities to elastin and some elastin peptides, providing support for the utility of the mimetic peptides. Furthermore, previous NMR and CD studies indicated that the structure of the elastin-like polypeptide (LGGVG)n in solution is best described as a "conformational ensemble" with a mixture of type I and II beta-turns, in addition to unfolded regions. Our data indicate that the peptide does not adopt a single conformation in the solid state, lending further support to models for elastin that involve significant conformational heterogeneity.
Collapse
|
40
|
Murata K, Kono H, Katoh E, Kuroki S, Ando I. A study of conformational stability of polypeptide blends by solid state two-dimensional 13C–1H heteronuclear correlation NMR spectroscopy. POLYMER 2003. [DOI: 10.1016/s0032-3861(03)00351-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
41
|
|
42
|
Alberti E, Gilbert SM, Tatham AS, Shewry PR, Naito A, Okuda K, Saitô H, Gil AM. Study of wheat high molecular weight 1Dx5 subunit by (13)C and (1)H solid-state NMR. II. Roles of nonrepetitive terminal domains and length of repetitive domain. Biopolymers 2002; 65:158-68. [PMID: 12209466 DOI: 10.1002/bip.10212] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This work follows a previous article that addressed the role of disulfide bonds in the behavior of the 1Dx5 subunit upon hydration. Here the roles of nonrepetitive terminal domains present and the length of the central repetitive domain in the hydration of 1Dx5 are investigated. This was achieved by comparing the hydration behavior of suitable model samples determined by (13)C- and (1)H-NMR: an alkylated 1Dx5 subunit (alk1Dx5), a recombinant 58-kDa peptide corresponding to the central repetitive domain of 1Dx5 (i.e., lacking the terminal domains), and two synthetic peptides (with 6 and 21 amino acid residues) based on the consensus repeat motifs of the central domain. The (13)C cross-polarization and magic angle spinning (MAS) experiments recorded as a function of hydration gave information about the protein or peptide fractions resisting plasticization. Conversely, (13)C single pulse excitation and (1)H-MAS gave information on the more plasticized segments. The results are consistent with the previous proposal of a hydrated network held by hydrogen-bonded glutamines and possibly hydrophobic interactions. The nonrepetitive terminal domains were found to induce water insolubility and a generally higher network hindrance. Shorter chain lengths were shown to increase plasticization and water solubility. However, at low water contents, the 21-mer peptide was characterized by higher hindrance in the megahertz and kilohertz frequency ranges compared to the longer peptide; and a tendency for a few hydrogen-bonded glutamines and hydrophobic residues to remain relatively hindered was still observed, as for the protein and large peptide. It is suggested that this ability is strongly dependent on the peptide primary structure.
Collapse
Affiliation(s)
- Enrica Alberti
- Department of Chemistry, University of Aveiro, Campus de Santiago, 3800-193 Aveiro, Portugal
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Alberti E, Gilbert SM, Tatham AS, Shewry PR, Gil AM. Study of high molecular weight wheat glutenin subunit 1Dx5 by 13C and 1H solid-state NMR spectroscopy. I. Role of covalent crosslinking. Biopolymers 2002; 67:487-98. [PMID: 12209455 DOI: 10.1002/bip.10168] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This work describes a carbon and proton solid-state NMR study of the hydration of a high molecular weight wheat glutenin subunit, 1Dx5. The effect of the presence of disulfide bonds on the hydration behavior of the subunit is investigated by a comparison of the unalkylated and alkylated forms of the protein. Hydration induces partial plasticization of the protein so that some segments become more mobile than others. The 13C cross-polarization and magic-angle spinning (MAS) spectra of the samples in the dry state and at two hydration levels (approximately 40 and approximately 65% D2O) were used to monitor the protein fraction resisting plasticization (trains). Conversely, 13C single pulse excitation and 1H-MAS experiments were used to gain information on the more plasticized segments (loops). The molecular motion of the two protein dynamic populations was further characterized by 13C T1 and 1H T(1rho), T2, and T1 relaxation times. The results suggest that hydration leads to the formation of a network held by a cooperative action of hydrogen bonded glutamines and some hydrophobic interactions. The looser protein segments are suggested to be glycine- and glutamine-rich segments. The primary structure is therefore expected to significantly determine the proportion of trains and loops in the network. The presence of disulfide bonds was observed to promote easier plasticization of the protein and the formation of a more mobile network, probably involving a higher number of loops and/or larger loops.
Collapse
Affiliation(s)
- Enrica Alberti
- Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
| | | | | | | | | |
Collapse
|
44
|
Huster D, Schiller J, Arnold K. Comparison of collagen dynamics in articular cartilage and isolated fibrils by solid-state NMR spectroscopy. Magn Reson Med 2002; 48:624-32. [PMID: 12353279 DOI: 10.1002/mrm.10272] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Native pig articular cartilage was investigated by (13)C cross polarization (CP) magic angle spinning (MAS) NMR at a magnetic field strength of 17.6 T. CP MAS spectra of cartilage are dominated by resonances from rigid collagen, while only low-intensity signals from the glycosaminoglycans are observed. The spectral resolution of collagen fibrils in native cartilage is somewhat higher than for isolated collagen fibrils from bovine achilles tendon investigated for comparison. This is confirmed qualitatively by (1)H-(1)H wideline separation spectra that show much lower line widths for cartilage collagen compared to isolated collagen. The strength of (1)H-(13)C dipolar couplings was measured in a 2D LG CP experiment providing a motionally averaged dipolar coupling value for each resolved signal. These scaled couplings were converted to molecular order parameters for the CH bond vector. Typical order parameters for isolated collagen were 0.91-0.96 for sidechains and 0.98-1.00 for the backbone. Somewhat lower order parameters were determined for cartilage collagen; 0.79-0.90 for the sidechain and 0.92-0.97 for the backbone. The only glycosaminoglycan signals that could be detected by CP MAS show order parameters of 0.48-0.92 and are assigned to relatively rigid hyaluronan and keratan sulfate. The higher mobility of collagen in cartilage is due to the high water content and collisions with the isotropically mobile glycosaminoglycans, such as chondroitin sulfate. Therefore, the mobility of cartilage macromolecules is broadly distributed from almost completely rigid to highly mobile, which lends cartilage its mechanical strength and shock-absorbing properties.
Collapse
Affiliation(s)
- Daniel Huster
- Junior Research Group Solid-state NMR studies of membrane-associated proteins, Biotechnological-Biomedical Center, University of Leipzig, Germany.
| | | | | |
Collapse
|
45
|
Perry A, Stypa MP, Foster JA, Kumashiro KK. Observation of the glycines in elastin using (13)C and (15)N solid-state NMR spectroscopy and isotopic labeling. J Am Chem Soc 2002; 124:6832-3. [PMID: 12059197 DOI: 10.1021/ja017711x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the solid-state 13C and 15N NMR of insoluble elastin which has been synthesized in vitro with isotopically enriched glycine. Most of the glycines reside in a domain with good cross-polarization (CP) efficiencies, although surprisingly, a portion resides in an environment that is not detectable using CP. Our data indicate that much of the 13C population resides in regions of significant conformational flexibility. To support these conclusions, we present 13C and 15N cross-polarization with magic-angle-spinning (CPMAS) data in conjunction with "direct-polarization", nonspinning CP, and T1 measurements.
Collapse
Affiliation(s)
- Ashlee Perry
- Department of Chemistry, University of Hawaii, Honolulu, Hawaii 96822, USA
| | | | | | | |
Collapse
|
46
|
Murata K, Kuroki S, Kimura H, Ando I. A study of conformational stability of poly(L-alanine), poly(L-valine), and poly(L-alanine)/poly(L-valine) blends in the solid state by (13)C cross-polarization/magic angle spinning NMR. Biopolymers 2002; 64:26-33. [PMID: 11948439 DOI: 10.1002/bip.10124] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
13C cross-polarization/magic angle spinning (CP/MAS) NMR and (1)H T(1rho) experiments of poly(L-alanine) (PLA), poly(L-valine) (PLV), and PLA/PLV blends have been carried out in order to elucidate the conformational stability of the polypeptides in the solid state. These were prepared by adding a trifluoroacetic acid (TFA) solution of the polymer with a 2.0 wt/wt % of sulfuric acid (H(2)SO(4)) to alkaline water. From these experimental results, it is clarified that the conformations of PLA and PLV in their blends are strongly influenced by intermolecular hydrogen-bonding interactions that cause their miscibility at the molecular level.
Collapse
Affiliation(s)
- Katsuyoshi Murata
- Department of Chemistry and Materials Science, International Research Center of Macromolecular Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan
| | | | | | | |
Collapse
|
47
|
A study of the conformational stability of poly(l-alanine), poly(d-alanine), poly(l-isoleucine), polyglycine and poly(l-valine) and their polypeptide blends in the solid-state by 13C CP/MAS NMR. POLYMER 2002. [DOI: 10.1016/s0032-3861(02)00616-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
48
|
High-resolution solid-state 17O NMR studies of polyglycines and their hydrogen-bonded structures. J Mol Struct 2002. [DOI: 10.1016/s0022-2860(01)00779-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
49
|
Zhou P, Li G, Shao Z, Pan X, Yu T. Structure of Bombyx mori Silk Fibroin Based on the DFT Chemical Shift Calculation. J Phys Chem B 2001. [DOI: 10.1021/jp0125395] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ping Zhou
- Contribution from The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Macromolecular Science Department, Fudan University, Shanghai 200433, P. R. China
| | - Guiyang Li
- Contribution from The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Macromolecular Science Department, Fudan University, Shanghai 200433, P. R. China
| | - Zhengzhong Shao
- Contribution from The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Macromolecular Science Department, Fudan University, Shanghai 200433, P. R. China
| | - Xiaoyun Pan
- Contribution from The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Macromolecular Science Department, Fudan University, Shanghai 200433, P. R. China
| | - Tongyin Yu
- Contribution from The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Macromolecular Science Department, Fudan University, Shanghai 200433, P. R. China
| |
Collapse
|
50
|
Alberti E, Humpfer E, Spraul M, Gilbert SM, Tatham AS, Shewry PR, Gil AM. A high resolution (1)H magic angle spinning NMR study of a high-M(r) subunit of wheat glutenin. Biopolymers 2001; 58:33-45. [PMID: 11072227 DOI: 10.1002/1097-0282(200101)58:1<33::aid-bip40>3.0.co;2-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This work describes the application of (1)H magic angle spinning (MAS) nmr to the study of hydrated 1Dx5 wheat high-M(r) subunit. 1Dx5 is a water-insoluble 88 kDa protein, associated with good baking performance, and whose structure in the solid and low-hydration states is not known. High-resolution MAS (HR-MAS) results in a threefold resolution improvement of the (1)H spectra of the hydrated wheat protein, compared to standard MAS. The spectral resolution achieved enables, for the first time, two-dimensional nmr methods to be employed for the study of hydrated 1Dx5 and the assignment of the spectrum to be carried out on the basis of total correlated spectroscopy and (13)C/(1)H correlation experiments. Considerable shifts are observed for some resonances, relative to the chemical shifts of amino acids in solution, indicating that specific interactions occur in the hydrated protein network. Two main environments are identified for glutamine residues, Q(1) and Q(2), and these were characterized in terms of possible conformation and relative dynamics, with the basis of comparison between the single 90 degrees spectrum and the Carr-Purcel-Heiboom-Gill (CPMG) spectrum. The Q(1) residues are proposed to be situated in protein segments that adopt the beta-sheet conformation and that remain relatively hindered, possibly by hydrogen bonds involving the glutamine amide groups. On the other hand, Q(2) residues are proposed to be situated in a more mobile environment, adopting a looser conformation, possibly a beta-turn conformation. Based on the proximity of the Q(2) residues with glycine residues, as viewed by the nuclear Overhauser effect spectroscopy experiment, it is proposed that the protein segments that form the more mobile (or loop) sections of the network are rich in both glutamine and glycine residues.
Collapse
Affiliation(s)
- E Alberti
- Department of Chemistry, University of Aveiro, 3800 Aveiro, Portugal
| | | | | | | | | | | | | |
Collapse
|