2ixm
From Proteopedia
(New page: 200px<br /> <applet load="2ixm" size="450" color="white" frame="true" align="right" spinBox="true" caption="2ixm, resolution 1.50Å" /> '''STRUCTURE OF HUMAN ...) |
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| - | [[Image:2ixm.gif|left|200px]]<br /> | + | [[Image:2ixm.gif|left|200px]]<br /><applet load="2ixm" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="2ixm" size=" | + | |
caption="2ixm, resolution 1.50Å" /> | caption="2ixm, resolution 1.50Å" /> | ||
'''STRUCTURE OF HUMAN PTPA'''<br /> | '''STRUCTURE OF HUMAN PTPA'''<br /> | ||
==Overview== | ==Overview== | ||
| - | PTPA, an essential and specific activator of protein phosphatase 2A | + | PTPA, an essential and specific activator of protein phosphatase 2A (PP2A), functions as a peptidyl prolyl isomerase (PPIase). We present here the crystal structures of human PTPA and of the two yeast orthologs (Ypa1 and Ypa2), revealing an all alpha-helical protein fold that is radically different from other PPIases. The protein is organized into two domains separated by a groove lined by highly conserved residues. To understand the molecular mechanism of PTPA activity, Ypa1 was cocrystallized with a proline-containing PPIase peptide substrate. In the complex, the peptide binds at the interface of a peptide-induced dimer interface. Conserved residues of the interdomain groove contribute to the peptide binding site and dimer interface. Structure-guided mutational studies showed that in vivo PTPA activity is influenced by mutations on the surface of the peptide binding pocket, the same mutations that also influenced the in vitro activation of PP2Ai and PPIase activity. |
==About this Structure== | ==About this Structure== | ||
| - | 2IXM is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http:// | + | 2IXM is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IXM OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Quevillon-Cheruel, S.]] | [[Category: Quevillon-Cheruel, S.]] | ||
[[Category: Schiltz, M.]] | [[Category: Schiltz, M.]] | ||
| - | [[Category: Tilbeurgh, H | + | [[Category: Tilbeurgh, H Van.]] |
[[Category: Vicentini, G.]] | [[Category: Vicentini, G.]] | ||
[[Category: 2 ptpa]] | [[Category: 2 ptpa]] | ||
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[[Category: protein phosphatase 2a]] | [[Category: protein phosphatase 2a]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:57:07 2008'' |
Revision as of 15:57, 21 February 2008
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STRUCTURE OF HUMAN PTPA
Overview
PTPA, an essential and specific activator of protein phosphatase 2A (PP2A), functions as a peptidyl prolyl isomerase (PPIase). We present here the crystal structures of human PTPA and of the two yeast orthologs (Ypa1 and Ypa2), revealing an all alpha-helical protein fold that is radically different from other PPIases. The protein is organized into two domains separated by a groove lined by highly conserved residues. To understand the molecular mechanism of PTPA activity, Ypa1 was cocrystallized with a proline-containing PPIase peptide substrate. In the complex, the peptide binds at the interface of a peptide-induced dimer interface. Conserved residues of the interdomain groove contribute to the peptide binding site and dimer interface. Structure-guided mutational studies showed that in vivo PTPA activity is influenced by mutations on the surface of the peptide binding pocket, the same mutations that also influenced the in vitro activation of PP2Ai and PPIase activity.
About this Structure
2IXM is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structure of the PP2A phosphatase activator: implications for its PP2A-specific PPIase activity., Leulliot N, Vicentini G, Jordens J, Quevillon-Cheruel S, Schiltz M, Barford D, van Tilbeurgh H, Goris J, Mol Cell. 2006 Aug 4;23(3):413-24. PMID:16885030
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