1qma: Difference between revisions

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[[Image:1qma.jpg|left|200px]]
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[[Image:1qma.png|left|200px]]


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{{STRUCTURE_1qma|  PDB=1qma  |  SCENE=  }}  
{{STRUCTURE_1qma|  PDB=1qma  |  SCENE=  }}  


'''NUCLEAR TRANSPORT FACTOR 2 (NTF2) W7A MUTANT'''
===NUCLEAR TRANSPORT FACTOR 2 (NTF2) W7A MUTANT===




==Overview==
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Nuclear transport factor 2 (NTF2) is a small, homodimeric protein that binds to both RanGDP and xFxFG repeat-containing nucleoporins, such as yeast Nsp1p and vertebrate p62. NTF2 is required for efficient nuclear protein import and has been shown to mediate the nuclear import of RanGDP. We have used the crystal structures of rat NTF2 and its complex with RanGDP to design a mutant, W7A-NTF2, in which the affinity for xFxFG-repeat nucleoporins is reduced while wild-type binding to RanGDP is retained. The 2.5 A resolution crystal structure of W7A-NTF2 is virtually superimposable upon the wild-type protein structure, indicating that the mutation had not introduced a more general conformational change. Therefore, our data suggest that the exposed side-chain of residue 7 is crucial to the interaction between NTF2 and xFxFG repeat-containing nucleoporins. Consistent with its reduced affinity for xFxFG nucleoporins, fluorescently labelled W7A-NTF2 binds less strongly to the nuclear envelope of permeabilized cultured cells than wild-type NTF2 and, when microinjected into Xenopus oocytes, colloidal gold coated with W7A-NTF2 binds less strongly to the central channel of nuclear pore complexes than wild-type NTF2-coated gold. Significantly, W7A-NTF2 only weakly stimulated the nuclear import of fluorescein-labelled RanGDP, providing direct evidence that an interaction between NTF2 and xFxFG repeat-containing nucleoporins is required to mediate the nuclear import of RanGDP.
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{{ABSTRACT_PUBMED_10543952}}


==About this Structure==
==About this Structure==
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[[Category: Stewart, M J.]]
[[Category: Stewart, M J.]]
[[Category: Transport]]
[[Category: Transport]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 06:26:41 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 20:13:10 2008''

Revision as of 17:13, 28 July 2008

File:1qma.png

Template:STRUCTURE 1qma

NUCLEAR TRANSPORT FACTOR 2 (NTF2) W7A MUTANT

Template:ABSTRACT PUBMED 10543952

About this Structure

1QMA is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Interaction between NTF2 and xFxFG-containing nucleoporins is required to mediate nuclear import of RanGDP., Bayliss R, Ribbeck K, Akin D, Kent HM, Feldherr CM, Gorlich D, Stewart M, J Mol Biol. 1999 Oct 29;293(3):579-93. PMID:10543952

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