Molecular packing structure of fibrin fibers resolved by X-ray scattering and molecular modeling
- AMOLF, Biological Soft Matter Group, Amsterdam, The Netherlands, UMC Utrecht
- KTH Royal Institute of Technology, Stockholm, Sweden, Sechenov University, Moscow 119991
- AMOLF, Biological Soft Matter Group, Amsterdam, The Netherlands, Institute of Cell Biology
- Macromolecular Chemistry and New Polymeric Materials, Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
- Netherlands Organization for Scientific Research (NWO), DUBBLE CRG at the ESRF, 38000 Grenoble Cedex, France
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA
- AMOLF, Biological Soft Matter Group, Amsterdam, The Netherlands, Department of Biomedical Engineering and Institute for Complex Molecular Systems
- Netherlands Organization for Scientific Research (NWO), DUBBLE CRG at the ESRF, 38000 Grenoble Cedex, France, Chemical Sciences Division
- Department of Chemistry, University of Massachusetts, Lowell, 01854, USA
- AMOLF, Biological Soft Matter Group, Amsterdam, The Netherlands, Department of Bionanoscience
Fibrin is the major extracellular component of blood clots and a proteinaceous hydrogel used as a versatile biomaterial. Fibrin forms branched networks built of laterally associated double-stranded protofibrils. This multiscale hierarchical structure is crucial for the extraordinary mechanical resilience of blood clots, yet the structural basis of clot mechanical properties remains largely unclear due, in part, to the unresolved molecular packing of fibrin fibers. Here the packing structure of fibrin fibers is quantitatively assessed by combining Small Angle X-ray Scattering (SAXS) measurements of fibrin reconstituted under a wide range of conditions with computational molecular modeling of fibrin protofibrils. The number, positions, and intensities of the Bragg peaks observed in the SAXS experiments were reproduced computationally based on the all-atom molecular structure of reconstructed fibrin protofibrils. Specifically, the model correctly predicts the intensities of the reflections of the 22.5 nm axial repeat, corresponding to the half-staggered longitudinal arrangement of fibrin molecules. In addition, the SAXS measurements showed that protofibrils within fibrin fibers have a partially ordered lateral arrangement with a characteristic transverse repeat distance of 13 nm, irrespective of the fiber thickness. These findings provide fundamental insights into the molecular structure of fibrin clots that underlies their biological and physical properties.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; European Research Council (ERC); American Heart Association; National Institutes of Health (NIH); National Science Foundation (NSF)
- Grant/Contract Number:
- AC05-00OR22725; 851960; 15GRNT23150000; 13GRNT16960013; HL135254; UO1-HL116330; DMR 1505662; DMR 1505316
- OSTI ID:
- 1647682
- Alternate ID(s):
- OSTI ID: 1661245
- Journal Information:
- Soft Matter, Journal Name: Soft Matter Vol. 16 Journal Issue: 35; ISSN 1744-683X
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
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