An allosteric mechanism to displace nuclear export cargo from CRM1 and RanGTP by RanBP1

Masako Koyama, Yoshiyuki Matsuura

研究成果: Article査読

68 被引用数 (Scopus)

抄録

The karyopherin CRM1 mediates nuclear export of proteins and ribonucleoproteins bearing a leucine-rich nuclear export signal (NES). To elucidate the precise mechanism by which NES-cargos are dissociated from CRM1 in the cytoplasm, which is important for transport directionality, we determined a 2.0-resolution crystal structure of yeast CRM1:RanBP1:RanGTP complex, an intermediate in the disassembly of the CRM1 nuclear export complex. The structure shows that on association of Ran-binding domain (RanBD) of RanBP1 with CRM1:NES-cargo:RanGTP complex, RanBD and the C-terminal acidic tail of Ran induce a large movement of the intra-HEAT9 loop of CRM1. The loop moves to the CRM1 inner surface immediately behind the NES-binding site and causes conformational rearrangements in HEAT repeats 11 and 12 so that the hydrophobic NES-binding cleft on the CRM1 outer surface closes, squeezing out the NES-cargo. This allosteric mechanism accelerates dissociation of NES by over two orders of magnitude. Structure-based mutagenesis indicated that the HEAT9 loop also functions as an allosteric autoinhibitor to stabilize CRM1 in a conformation that is unable to bind NES-cargo in the absence of RanGTP.

本文言語English
ページ(範囲)2002-2013
ページ数12
ジャーナルEMBO Journal
29
12
DOI
出版ステータスPublished - 2010 6 16
外部発表はい

ASJC Scopus subject areas

  • 分子生物学
  • 生化学、遺伝学、分子生物学(全般)
  • 免疫学および微生物学(全般)
  • 神経科学(全般)

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