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Oxidation state dependent conformational changes of HMGB1 regulate the formation of the CXCL12/HMGB1 heterocomplex

  • Fassi, Enrico M.A. Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland
  • Sgrignani, Jacopo Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland
  • D'Agostino, Gianluca Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland
  • Cecchinato, Valentina Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland
  • Garofalo, Maura Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland - University of Lausanne (UNIL), Switzerland
  • Grazioso, Giovanni Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Italy
  • Uguccioni, Mariagrazia Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland - Humanitas University, Department of Biomedical Sciences, Pieve Emanuele, Milan, Italy
  • Cavalli, Andrea Institute for Research in Biomedicine (IRB), Faculty of Biomedical Sciences, Università della Svizzera italiana, Switzerland - Swiss Institute of Bioinformatics, Lausanne, Switzerland
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    21.06.2019
Published in:
  • Computational and structural biotechnology journal. - 2019, vol. 17, p. 886-894
HMGB1
CXCL12
Molecular dynamics
Protein-protein docking
Conformational ensemble
English High-mobility Group Box 1 (HMGB1) is an abundant protein present in all mammalian cells and involved in several processes. During inflammation or tissue damage, HMGB1 is released in the extracellular space and, depending on its redox state, can form a heterocomplex with CXCL12. The heterocomplex acts exclusively via the chemokine receptor CXCR4 enhancing leukocyte recruitment. Here, we used multi-microsecond molecular dynamics (MD) simulations to elucidate the effect of the disulfide bond on the structure and dynamics of HMGB1. The results of the MD simulations show that the presence or lack of the disulfide bond between Cys23 and Cys45 modulates the conformational space explored by HMGB1, making the reduced protein more suitable to form a complex with CXCL12.
Language
  • English
Classification
Biology, life sciences
License
CC BY-NC-ND
Open access status
gold
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Persistent URL
https://n2t.net/ark:/12658/srd1319123
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