1ra7
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(New page: 200px<br /><applet load="1ra7" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ra7, resolution 2.35Å" /> '''Poliovirus Polymeras...)
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Revision as of 23:16, 20 November 2007
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Poliovirus Polymerase with GTP
Overview
The active RNA-dependent RNA polymerase of poliovirus, 3Dpol, is generated, by cleavage of the 3CDpro precursor protein, a protease that has no, polymerase activity despite containing the entire polymerase domain. By, intentionally disrupting a known and persistent crystal packing, interaction, we have crystallized the poliovirus polymerase in a new space, group and solved the complete structure of the protein at 2.0 A, resolution. It shows that the N-terminus of fully processed 3Dpol is, buried in a surface pocket where it makes hydrogen bonds that act to, position Asp238 in the active site. Asp238 is an essential residue that, selects for the 2' OH group of substrate rNTPs, as shown by a 2.35 A, structure of a 3Dpol-GTP complex. Mutational, biochemical, and structural, data further demonstrate that 3Dpol activity is exquisitely sensitive to, mutations at the N-terminus. This sensitivity is the result of allosteric, effects where the structure around the buried N-terminus directly affects, the positioning of Asp238 in the active site.
About this Structure
1RA7 is a Single protein structure of sequence from Human poliovirus 1 with GTP and ACY as ligands. Active as RNA-directed RNA polymerase, with EC number 2.7.7.48 Full crystallographic information is available from OCA.
Reference
Structural basis for proteolysis-dependent activation of the poliovirus RNA-dependent RNA polymerase., Thompson AA, Peersen OB, EMBO J. 2004 Sep 1;23(17):3462-71. Epub 2004 Aug 12. PMID:15306852
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