2p51
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(New page: 200px<br /><applet load="2p51" size="350" color="white" frame="true" align="right" spinBox="true" caption="2p51, resolution 1.40Å" /> '''Crystal structure of...)
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Revision as of 12:59, 23 January 2008
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Crystal structure of the S. pombe Pop2p deadenylation subunit
Overview
Deadenylation is the first and probably also rate-limiting step of, controlled mRNA decay in eukaryotes and therefore central for the overall, rate of gene expression. In yeast, the process is maintained by the, mega-Dalton Ccr4-Not complex, of which both the Ccr4p and Pop2p subunits, are 3'-5' exonucleases potentially responsible for the deadenylation, reaction. Here, we present the crystal structure of the Pop2p subunit from, Schizosaccharomyces pombe determined to 1.4 A resolution and show that the, enzyme is a competent ribonuclease with a tunable specificity towards, poly-A. In contrast to S. cerevisiae Pop2p, the S. pombe enzyme contains a, fully conserved DEDDh active site, and the high resolution allows for a, detailed analysis of its configuration, including divalent metal ion, binding. Functional data further indicates that the identity of the ions, in the active site can modulate both activity and specificity of the, enzyme, and finally structural superposition of single nucleotides and, poly-A oligonucleotides provide insight into the catalytic cycle of the, protein.
About this Structure
2P51 is a Single protein structure of sequence from Schizosaccharomyces pombe with as ligand. Full crystallographic information is available from OCA.
Reference
The 1.4-A crystal structure of the S. pombe Pop2p deadenylase subunit unveils the configuration of an active enzyme., Jonstrup AT, Andersen KR, Van LB, Brodersen DE, Nucleic Acids Res. 2007;35(9):3153-64. Epub 2007 Apr 22. PMID:17452359
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