Targeted molecular dynamics reveals overall common conformational changes upon hybrid domain swing-out in β3 integrins

Davide Provasi, Marta Murcia, Barry S. Coller, Marta Filizola

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The β3 integrin family members αIIbβ3 and αVβ3 signal bidirectionally through long-range allosteric changes, including a transition from a bent unliganded-closed low-affinity state to an extended liganded-open high-affinity state. To obtain an atomic-level description of this transition in an explicit solvent, we carried out targeted molecular dynamics simulations of the headpieces of αIIbβ3 and αVβ3 integrins. Although minor differences were observed between these receptors, our results suggest a common transition pathway in which the hybrid domain swing-out is accompanied by conformational changes within the β3 βA (I-like) domain that propagate through the α7 helix C-terminus, and are followed by the α7 helix downward motion and the opening of the β6-α7 loop. Breaking of contact interactions between the β6-α7 loop and the α1 helix N-terminus results in helix straightening, internal rearrangements of the specificity determining loop (SDL), movement of the β1-α1 loop toward the metal ion dependent adhesion site (MIDAS), and final changes at the interfaces between the β3 βA (I-like) domain and either the hybrid or the α β-propeller domains. Taken together, our results suggest novel testable hypotheses of intradomain and interdomain interactions responsible for β3 integrin activation.

Original languageEnglish
Pages (from-to)477-489
Number of pages13
JournalProteins: Structure, Function and Bioinformatics
Volume77
Issue number2
DOIs
StatePublished - 1 Nov 2009

Keywords

  • Activation
  • Simulation
  • Transition pathway
  • αIIbβ3
  • αVβ3

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