1ee5: Difference between revisions

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[[Image:1ee5.gif|left|200px]]
[[Image:1ee5.png|left|200px]]


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==Overview==
{{ABSTRACT_10745017}}
BACKGROUND: Karyopherin alpha (importin alpha) is an adaptor molecule that recognizes proteins containing nuclear localization signals (NLSs). The prototypical NLS that is able to bind to karyopherin alpha is that of the SV40 T antigen, and consists of a short positively charged sequence motif. Distinct classes of NLSs (monopartite and bipartite) have been identified that are only partly conserved with respect to one another but are nevertheless recognized by the same receptor. RESULTS: We report the crystal structures of two peptide complexes of yeast karyopherin alpha (Kapalpha): one with a human c-myc NLS peptide, determined at 2.1 A resolution, and one with a Xenopus nucleoplasmin NLS peptide, determined at 2.4 A resolution. Analysis of these structures reveals the determinants of specificity for the binding of a relatively hydrophobic monopartite NLS and of a bipartite NLS peptide. The peptides bind Kapalpha in its extended surface groove, which presents a modular array of tandem binding pockets for amino acid residues. CONCLUSIONS: Monopartite and bipartite NLSs bind to a different number of amino acid binding pockets and make different interactions within them. The relatively hydrophobic monopartite c-myc NLS binds extensively at a few binding pockets in a similar manner to that of the SV40 T antigen NLS. In contrast, the bipartite nucleoplasmin NLS engages the whole array of pockets with individually more limited but overall more abundant interactions, which include the NLS two basic clusters and the backbone of its non-conserved linker region. Versatility in the specific recognition of NLSs relies on the modular.


==About this Structure==
==About this Structure==
1EE5 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] and [http://en.wikipedia.org/wiki/Xenopus_laevis Xenopus laevis]. The following page contains interesting information on the relation of 1EE5 with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb85_1.html Importins]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EE5 OCA].  
1EE5 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] and [http://en.wikipedia.org/wiki/Xenopus_laevis Xenopus laevis]. The following page contains interesting information on the relation of 1EE5 with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb85_1.html Importins]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EE5 OCA].  
==Reference==
Crystallographic analysis of the specific yet versatile recognition of distinct nuclear localization signals by karyopherin alpha., Conti E, Kuriyan J, Structure. 2000 Mar 15;8(3):329-38. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10745017 10745017]
[[Category: Importins]]
[[Category: Importins]]
[[Category: Protein complex]]
[[Category: Protein complex]]
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[[Category: Conti, E.]]
[[Category: Conti, E.]]
[[Category: Armadillo repeat]]
[[Category: Armadillo repeat]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 14:59:12 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jun 26 17:13:11 2008''

Revision as of 14:13, 26 June 2008

File:1ee5.png

Template:STRUCTURE 1ee5

YEAST KARYOPHERIN (IMPORTIN) ALPHA IN A COMPLEX WITH A NUCLEOPLASMIN NLS PEPTIDE


Template:ABSTRACT 10745017

About this Structure

1EE5 is a Protein complex structure of sequences from Saccharomyces cerevisiae and Xenopus laevis. The following page contains interesting information on the relation of 1EE5 with [Importins]. Full crystallographic information is available from OCA.

Page seeded by OCA on Thu Jun 26 17:13:11 2008

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