2p8q
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| , resolution 2.35Å | |||||||
|---|---|---|---|---|---|---|---|
| Gene: | KPNB1, NTF97 (Homo sapiens) | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal Structure of human Importin beta bound to the Snurportin1 IBB-domain
OverviewOverview
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 StructureAbout this Structure
2P8Q is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
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
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