RRC ID 34732
Author Maki T, Grimaldi AD, Fuchigami S, Kaverina I, Hayashi I.
Title CLASP2 Has Two Distinct TOG Domains That Contribute Differently to Microtubule Dynamics.
Journal J Mol Biol
Abstract CLIP-associated proteins CLASPs are mammalian microtubule (MT) plus-end tracking proteins (+TIPs) that promote MT rescue in vivo. Their plus-end localization is dependent on other +TIPs, EB1 and CLIP-170, but in the leading edge of the cell, CLASPs display lattice-binding activity. MT association of CLASPs is suggested to be regulated by multiple TOG (tumor overexpressed gene) domains and by the serine-arginine (SR)-rich region, which contains binding sites for EB1. Here, we report the crystal structures of the two TOG domains of CLASP2. Both domains consist of six HEAT repeats, which are similar to the canonical paddle-like tubulin-binding TOG domains, but have arched conformations. The degrees and directions of curvature are different between the two TOG domains, implying that they have distinct roles in MT binding. Using biochemical, molecular modeling and cell biological analyses, we have investigated the interactions between the TOG domains and αβ-tubulin and found that each domain associates differently with αβ-tubulin. Our findings suggest that, by varying the degrees of domain curvature, the TOG domains may distinguish the structural conformation of the tubulin dimer, discriminate between different states of MT dynamic instability and thereby function differentially as stabilizers of MTs.
Volume 427(14)
Pages 2379-95
Published 2015-7-17
DOI 10.1016/j.jmb.2015.05.012
PII S0022-2836(15)00296-X
PMID 26003921
PMC PMC4646087
MeSH Amino Acid Sequence Animals Binding Sites Cells, Cultured Crystallography, X-Ray HEK293 Cells Humans Mice Microtubule-Associated Proteins / chemistry* Microtubule-Associated Proteins / metabolism Microtubules / metabolism* Models, Molecular Molecular Sequence Data Protein Binding Protein Multimerization Protein Structure, Secondary Protein Structure, Tertiary / physiology
IF 4.76
Times Cited 15
DNA material CSII-CMV-MCS (RDB04377)