Distinct mechanisms of recognizing endosomal sorting complex required for transport III (ESCRT-III) protein IST1 by different microtubule interacting and trafficking (MIT) domains

Abstract

Background: IST1 recruits MIT domain-containing proteins VPS4, LIP5, and Spartin to the mid-body during cytokinesis. Results: Crystal structures of IST1 in complex with VPS4, LIP5, or Spartin were determined. Conclusion: IST1 binds to structurally similar MIT domains using two distinct mechanisms. Significance: This study elucidated for the first time the structural basis that determines the specificity in IST1-MIT domain interaction.