6COK

Structure of the 2nd TOG domain from yeast CLASP protein STU1

6COK の概要

• エントリーDOI: 10.2210/pdb6cok/pdb
• 分子名称: Protein STU1 (2 entities in total)
• 機能のキーワード: heat repeat, single domain, protein binding
• 由来する生物種: Saccharomyces cerevisiae (Baker's yeast)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 36861.27

構造登録者

Majumdar, S.,Rice, L.M. (登録日: 2018-03-12, 公開日: 2019-01-23, 最終更新日: 2024-03-13)

主引用文献

Majumdar, S.,Kim, T.,Chen, Z.,Munyoki, S.,Tso, S.C.,Brautigam, C.A.,Rice, L.M.
An isolated CLASP TOG domain suppresses microtubule catastrophe and promotes rescue.
Mol. Biol. Cell, 29:1359-1375, 2018

PubMed Abstract: Microtubules are heavily regulated dynamic polymers of αβ-tubulin that are required for proper chromosome segregation and organization of the cytoplasm. Polymerases in the XMAP215 family use arrayed TOG domains to promote faster microtubule elongation. Regulatory factors in the cytoplasmic linker associated protein (CLASP) family that reduce catastrophe and/or increase rescue also contain arrayed TOGs, but how CLASP TOGs contribute to activity is poorly understood. Here, using Saccharomyces cerevisiae Stu1 as a model CLASP, we report structural, biochemical, and reconstitution studies that clarify functional properties of CLASP TOGs. The two TOGs in Stu1 have very different tubulin-binding properties: TOG2 binds to both unpolymerized and polymerized tubulin, and TOG1 binds very weakly to either. The structure of Stu1-TOG2 reveals a CLASP-specific residue that likely confers distinctive tubulin-binding properties. The isolated TOG2 domain strongly suppresses microtubule catastrophe and increases microtubule rescue in vitro, contradicting the expectation that regulatory activity requires an array of TOGs. Single point mutations on the tubulin-binding surface of TOG2 ablate its anti-catastrophe and rescue activity in vitro, and Stu1 function in cells. Revealing that an isolated CLASP TOG can regulate polymerization dynamics without being part of an array provides insight into the mechanism of CLASPs and diversifies the understanding of TOG function.

PubMed: 29851564
DOI: 10.1091/mbc.E17-12-0748

実験手法

X-RAY DIFFRACTION (1.89 Å)