1wa5

From Proteopedia

Revision as of 15:25, 5 November 2007

CRYSTAL STRUCTURE OF THE EXPORTIN CSE1P COMPLEXED WITH ITS CARGO (KAP60P) AND RANGTP

Overview

The nuclear import and export of macromolecular cargoes through nuclear, pore complexes is mediated primarily by carriers such as importin-beta., Importins carry cargoes into the nucleus, whereas exportins carry cargoes, to the cytoplasm. Transport is orchestrated by nuclear RanGTP, which, dissociates cargoes from importins, but conversely is required for cargo, binding to exportins. Here we present the 2.0 A crystal structure of the, nuclear export complex formed by exportin Cse1p complexed with its cargo, (Kap60p) and RanGTP, thereby providing a structural framework for, understanding nuclear protein export and the different functions of RanGTP, in export and import. In the complex, Cse1p coils around both RanGTP and, Kap60p, stabilizing the RanGTP-state and clamping the Kap60p, importin-beta-binding domain, ensuring that only cargo-free Kap60p is, exported. Mutagenesis indicated that conformational changes in exportins, couple cargo binding to high affinity for RanGTP, generating a, spring-loaded molecule to facilitate disassembly of the export complex, following GTP hydrolysis in the cytoplasm.

About this Structure

1WA5 is a Protein complex structure of sequences from Canis lupus familiaris and Saccharomyces cerevisiae with MG and GTP as ligands. The following page contains interesting information on the relation of 1WA5 with [Importins]. Structure known Active Site: AC1. Full crystallographic information is available from OCA.

Reference

Structural basis for the assembly of a nuclear export complex., Matsuura Y, Stewart M, Nature. 2004 Dec 16;432(7019):872-7. PMID:15602554

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