Two pathways mediate interdomain allosteric regulation in Pin1

Jingjing Guo, Xiaodong Pang, Huan Xiang Zhou

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Allostery is an essential means for regulating biomolecular functions and provides unique opportunities for drug design, yet our ability to elucidate allosteric mechanisms remains limited. Here, based on extensive molecular dynamics simulations, we present an atomistic picture of the pathways mediating the allosteric regulation of the PPIase domain of Pin1 by its WW domain. Two pathways jointly propagate the action of substrate-WW binding to produce closure and rigidification of three PPIase catalytic-site loops. One pathway preexists in the apo protein, but remains dormant until substrate-WW binding completes the second. The reduction in conformational entropy and preorganization of the catalytic-site loops observed here may explain why substrate-WW binding enhances ligand affinity and catalytic activity of the PPIase domain and suggest a combination drug therapy for Pin1-related diseases. Whereas the traditional view of allostery has emphasized conformational transition, our study identifies a distinct role of conformational dynamics in eliciting allostery.

Original languageEnglish
Pages (from-to)237-247
Number of pages11
JournalStructure
Volume23
Issue number1
DOIs
Publication statusPublished - 6 Jan 2015
Externally publishedYes

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