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1qbk

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[[Image:1qbk.gif|left|200px]]
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{{STRUCTURE_1qbk| PDB=1qbk | SCENE= }}
{{STRUCTURE_1qbk| PDB=1qbk | SCENE= }}
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'''STRUCTURE OF THE KARYOPHERIN BETA2-RAN GPPNHP NUCLEAR TRANSPORT COMPLEX'''
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===STRUCTURE OF THE KARYOPHERIN BETA2-RAN GPPNHP NUCLEAR TRANSPORT COMPLEX===
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==Overview==
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Transport factors in the karyopherin-beta (also called importin-beta) family mediate the movement of macromolecules in nuclear-cytoplasmic transport pathways. Karyopherin-beta2 (transportin) binds a cognate import substrate and targets it to the nuclear pore complex. In the nucleus, Ran x GTP binds karyopherin-beta2 and dissociates the substrate. Here we present the 3.0 A structure of the karyopherin-beta2-Ran x GppNHp complex where GppNHp is a non-hydrolysable GTP analogue. Karyopherin-beta2 contains eighteen HEAT repeats arranged into two continuous orthogonal arches. Ran is clamped in the amino-terminal arch and substrate-binding activity is mapped to the carboxy-terminal arch. A large loop in HEAT repeat 7 spans both arches. Interactions of the loop with Ran and the C-terminal arch implicate it in GTPase-mediated dissociation of the import-substrate. Ran x GppNHp in the complex shows extensive structural rearrangement, compared to Ran GDP, in regions contacting karyopherin-beta2. This provides a structural basis for the specificity of the karyopherin-beta family for the GTP-bound state of Ran, as well as a rationale for interactions of the karyopherin-Ran complex with the regulatory proteins ranGAP, ranGEF and ranBP1.
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(as it appears on PubMed at http://www.pubmed.gov), where 10353245 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10353245}}
==About this Structure==
==About this Structure==
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[[Category: Chook, Y M.]]
[[Category: Chook, Y M.]]
[[Category: Heat repeat]]
[[Category: Heat repeat]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:06:09 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 13:16:54 2008''

Revision as of 10:16, 27 July 2008

Image:1qbk.png

Template:STRUCTURE 1qbk

STRUCTURE OF THE KARYOPHERIN BETA2-RAN GPPNHP NUCLEAR TRANSPORT COMPLEX

Template:ABSTRACT PUBMED 10353245

About this Structure

1QBK is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structure of the nuclear transport complex karyopherin-beta2-Ran x GppNHp., Chook YM, Blobel G, Nature. 1999 May 20;399(6733):230-7. PMID:10353245

Page seeded by OCA on Sun Jul 27 13:16:54 2008

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