A multiscale model for simulating binding kinetics of proteins with flexible linkers

Jiawen Chen, Zhong Ru Xie, Yinghao Wu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The kinetics of protein interactions are essential determinants in many cellular processes such as signal transduction and transcriptional regulation. Many proteins involved in these functions contain intrinsic disordered regions. This makes conformational flexibility become an unneglectable factor when studying the binding kinetic of these proteins. Compared with the binding of rigid proteins that is limited by diffusions, the binding mechanisms of proteins with internal flexibility are much more complicated. Using a small protein that contains two domains and a connecting loop as a testing system, we developed a multiscale simulation framework to study the role of flexible linkers in regulating kinetics of protein binding. The association and dissociation processes were implemented by a coarse-grained Monte-Carlo algorithm, while the conformational changes of the flexible linker were captured from all-atom molecular dynamic simulations. Our simulations illustrated that the presence of the extended domain linker can enhance the rate of protein association. On the other hand, the full-length flexible molecule is more difficult to dissociate than its two rigid domains but much easier than the molecule with a rigid linker. Overall, our studies demonstrated that both kinetics and thermodynamics of protein binding are closely modulated by the dynamic features of linker regions.

Original languageEnglish (US)
Pages (from-to)2512-2522
Number of pages11
JournalProteins: Structure, Function and Bioinformatics
Volume82
Issue number10
DOIs
StatePublished - 2014

Keywords

  • Cell signaling
  • Coarse-grained
  • Conformational flexibility
  • Intrinsic disorder
  • Monte-Carlo simulation

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology

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