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

Fassi, Enrico M.A.; Sgrignani, Jacopo; D'Agostino, Gianluca; Cecchinato, Valentina; Garofalo, Maura; Grazioso, Giovanni; Uguccioni, Mariagrazia; Cavalli, Andrea

doi:10.1016/j.csbj.2019.06.020

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Journal article

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

21.06.2019

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Computational and structural biotechnology journal. - 2019, vol. 17, p. 886-894

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.

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