2npi
From Proteopedia
(New page: 200px<br /><applet load="2npi" size="450" color="white" frame="true" align="right" spinBox="true" caption="2npi, resolution 2.95Å" /> '''Clp1-ATP-Pcf11 compl...) |
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| - | [[Image:2npi.gif|left|200px]]<br /><applet load="2npi" size=" | + | [[Image:2npi.gif|left|200px]]<br /><applet load="2npi" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2npi, resolution 2.95Å" /> | caption="2npi, resolution 2.95Å" /> | ||
'''Clp1-ATP-Pcf11 complex'''<br /> | '''Clp1-ATP-Pcf11 complex'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Pcf11 and Clp1 are subunits of cleavage factor IA (CFIA), an essential | + | Pcf11 and Clp1 are subunits of cleavage factor IA (CFIA), an essential polyadenylation factor in Saccahromyces cerevisiae. We have determined the structure of a ternary complex of Clp1 together with ATP and the Clp1-binding region of Pcf11. Clp1 contains three domains, a small N-terminal beta sandwich domain, a C-terminal domain containing a novel alpha/beta-fold and a central domain that binds ATP. The arrangement of the nucleotide binding site is similar to that observed in SIMIBI-class ATPase subunits found in other multisubunit macromolecular complexes. However, despite this similarity, nucleotide hydrolysis does not occur. The Pcf11 binding site is also located in the central domain where three highly conserved residues in Pcf11 mediate many of the protein-protein interactions. We propose that this conserved Clp1-Pcf11 interaction is responsible for maintaining a tight coupling between the Clp1 nucleotide binding subunit and the other components of the polyadenylation machinery. Moreover, we suggest that this complex represents a stabilized ATP bound form of Clp1 that requires the participation of other non-CFIA processing factors in order to initiate timely ATP hydrolysis during 3' end processing. |
==About this Structure== | ==About this Structure== | ||
| - | 2NPI is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with MG and ATP as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 2NPI is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with <scene name='pdbligand=MG:'>MG</scene> and <scene name='pdbligand=ATP:'>ATP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NPI OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
[[Category: Beuth, B.]] | [[Category: Beuth, B.]] | ||
| - | [[Category: Noble, C | + | [[Category: Noble, C G.]] |
| - | [[Category: Taylor, I | + | [[Category: Taylor, I A.]] |
[[Category: ATP]] | [[Category: ATP]] | ||
[[Category: MG]] | [[Category: MG]] | ||
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[[Category: ternary complex]] | [[Category: ternary complex]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:09:26 2008'' |
Revision as of 16:09, 21 February 2008
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Clp1-ATP-Pcf11 complex
Overview
Pcf11 and Clp1 are subunits of cleavage factor IA (CFIA), an essential polyadenylation factor in Saccahromyces cerevisiae. We have determined the structure of a ternary complex of Clp1 together with ATP and the Clp1-binding region of Pcf11. Clp1 contains three domains, a small N-terminal beta sandwich domain, a C-terminal domain containing a novel alpha/beta-fold and a central domain that binds ATP. The arrangement of the nucleotide binding site is similar to that observed in SIMIBI-class ATPase subunits found in other multisubunit macromolecular complexes. However, despite this similarity, nucleotide hydrolysis does not occur. The Pcf11 binding site is also located in the central domain where three highly conserved residues in Pcf11 mediate many of the protein-protein interactions. We propose that this conserved Clp1-Pcf11 interaction is responsible for maintaining a tight coupling between the Clp1 nucleotide binding subunit and the other components of the polyadenylation machinery. Moreover, we suggest that this complex represents a stabilized ATP bound form of Clp1 that requires the participation of other non-CFIA processing factors in order to initiate timely ATP hydrolysis during 3' end processing.
About this Structure
2NPI is a Protein complex structure of sequences from Saccharomyces cerevisiae with and as ligands. Full crystallographic information is available from OCA.
Reference
Structure of a nucleotide-bound Clp1-Pcf11 polyadenylation factor., Noble CG, Beuth B, Taylor IA, Nucleic Acids Res. 2007;35(1):87-99. Epub 2006 Dec 6. PMID:17151076
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