2q5d
From Proteopedia
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'''Crystal Structure of Human Importin Beta bound to the Snurportin1 IBB-domain second crystal form''' | '''Crystal Structure of Human Importin Beta bound to the Snurportin1 IBB-domain second crystal form''' | ||
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[[Category: Cingolani, G.]] | [[Category: Cingolani, G.]] | ||
[[Category: Mitrousis, G.]] | [[Category: Mitrousis, G.]] | ||
| - | [[Category: | + | [[Category: Heat repeat]] |
| - | [[Category: | + | [[Category: Ibb-domain]] |
| - | [[Category: | + | [[Category: Importin]] |
| - | [[Category: | + | [[Category: Karyopherin]] |
| - | [[Category: | + | [[Category: Protein transport]] |
| - | [[Category: | + | [[Category: Snurportin]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 14:23:09 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 11:23, 4 May 2008
Crystal Structure of Human Importin Beta bound to the Snurportin1 IBB-domain second crystal form
Overview
The nuclear import of uridine-rich ribonucleoproteins (U snRNPs) is mediated by the transport adaptor snurportin 1 (SNP1). Similar to importin alpha, SNP1 uses an N-terminal importin beta binding (sIBB) domain to recruit the receptor importin beta and gain access to the nucleus. In this paper, we demonstrate the sIBB-domain has a bipartite nature, which contains two distinct binding determinants for importin beta. The first determinant spans residues 25-65, and includes the previously identified alphaIBB-region of homology. The second binding determinant encompasses residues 1-24 and resembles region 1011-1035 of the nucleoporin 153 (Nup153). The two binding determinants synergize within the sIBB-domain to confer a low nanomolar binding affinity for importin beta, (Kd ~2nM) in an interaction that, in vitro, is displaced by RanGppNHp. We propose that in vivo the synergy of Nup153 and nuclear RanGTP promotes translocation of U snRNPs into the nucleus.
About this Structure
2Q5D is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Molecular basis for the recognition of snurportin 1 by importin beta., Mitrousis G, Olia AS, Walker-Kopp N, Cingolani G, J Biol Chem. 2008 Jan 9;. PMID:18187419 Page seeded by OCA on Sun May 4 14:23:09 2008
