1qjb
From Proteopedia
(New page: 200px<br /> <applet load="1qjb" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qjb, resolution 2.0Å" /> '''14-3-3 ZETA/PHOSPHOP...) |
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| - | [[Image:1qjb.gif|left|200px]]<br /> | + | [[Image:1qjb.gif|left|200px]]<br /><applet load="1qjb" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1qjb" size=" | + | |
caption="1qjb, resolution 2.0Å" /> | caption="1qjb, resolution 2.0Å" /> | ||
'''14-3-3 ZETA/PHOSPHOPEPTIDE COMPLEX (MODE 1)'''<br /> | '''14-3-3 ZETA/PHOSPHOPEPTIDE COMPLEX (MODE 1)'''<br /> | ||
==Overview== | ==Overview== | ||
| - | We have solved the high-resolution X-ray structure of 14-3-3 bound to two | + | We have solved the high-resolution X-ray structure of 14-3-3 bound to two different phosphoserine peptides, representing alternative substrate-binding motifs. These structures reveal an evolutionarily conserved network of peptide-protein interactions within all 14-3-3 isotypes, explain both binding motifs, and identify a novel intrachain phosphorylation-mediated loop structure in one of the peptides. A 14-3-3 mutation disrupting Raf signaling alters the ligand-binding cleft, selecting a different phosphopeptide-binding motif and different substrates than the wild-type protein. Many 14-3-3: peptide contacts involve a C-terminal amphipathic alpha helix containing a putative nuclear export signal, implicating this segment in both ligand and Crm1 binding. Structural homology between the 14-3-3 NES structure and those within I kappa B alpha and p53 reveals a conserved topology recognized by the Crm1 nuclear export machinery. |
==About this Structure== | ==About this Structure== | ||
| - | 1QJB is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. This structure | + | 1QJB is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. This structure supersedes the now removed PDB entry 14PS. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QJB OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Budman, J.]] | [[Category: Budman, J.]] | ||
| - | [[Category: Cantley, L | + | [[Category: Cantley, L C.]] |
| - | [[Category: Gamblin, S | + | [[Category: Gamblin, S J.]] |
[[Category: Rittinger, K.]] | [[Category: Rittinger, K.]] | ||
| - | [[Category: Smerdon, S | + | [[Category: Smerdon, S J.]] |
[[Category: Volinia, S.]] | [[Category: Volinia, S.]] | ||
[[Category: Xu, J.]] | [[Category: Xu, J.]] | ||
| - | [[Category: Yaffe, M | + | [[Category: Yaffe, M B.]] |
[[Category: 14-3-3]] | [[Category: 14-3-3]] | ||
[[Category: complex (peptide)]] | [[Category: complex (peptide)]] | ||
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[[Category: signal transducti]] | [[Category: signal transducti]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:40:15 2008'' |
Revision as of 12:40, 21 February 2008
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14-3-3 ZETA/PHOSPHOPEPTIDE COMPLEX (MODE 1)
Overview
We have solved the high-resolution X-ray structure of 14-3-3 bound to two different phosphoserine peptides, representing alternative substrate-binding motifs. These structures reveal an evolutionarily conserved network of peptide-protein interactions within all 14-3-3 isotypes, explain both binding motifs, and identify a novel intrachain phosphorylation-mediated loop structure in one of the peptides. A 14-3-3 mutation disrupting Raf signaling alters the ligand-binding cleft, selecting a different phosphopeptide-binding motif and different substrates than the wild-type protein. Many 14-3-3: peptide contacts involve a C-terminal amphipathic alpha helix containing a putative nuclear export signal, implicating this segment in both ligand and Crm1 binding. Structural homology between the 14-3-3 NES structure and those within I kappa B alpha and p53 reveals a conserved topology recognized by the Crm1 nuclear export machinery.
About this Structure
1QJB is a Single protein structure of sequence from Homo sapiens. This structure supersedes the now removed PDB entry 14PS. Full crystallographic information is available from OCA.
Reference
Structural analysis of 14-3-3 phosphopeptide complexes identifies a dual role for the nuclear export signal of 14-3-3 in ligand binding., Rittinger K, Budman J, Xu J, Volinia S, Cantley LC, Smerdon SJ, Gamblin SJ, Yaffe MB, Mol Cell. 1999 Aug;4(2):153-66. PMID:10488331
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