1fa0
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(New page: 200px<br /><applet load="1fa0" size="450" color="white" frame="true" align="right" spinBox="true" caption="1fa0, resolution 2.6Å" /> '''STRUCTURE OF YEAST PO...)
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Revision as of 12:37, 20 November 2007
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STRUCTURE OF YEAST POLY(A) POLYMERASE BOUND TO MANGANATE AND 3'-DATP
Overview
Polyadenylate [poly(A)] polymerase (PAP) catalyzes the addition of a, polyadenosine tail to almost all eukaryotic messenger RNAs (mRNAs). The, crystal structure of the PAP from Saccharomyces cerevisiae (Pap1) has been, solved to 2.6 angstroms, both alone and in complex with 3'-deoxyadenosine, triphosphate (3'-dATP). Like other nucleic acid polymerases, Pap1 is, composed of three domains that encircle the active site. The arrangement, of these domains, however, is quite different from that seen in, polymerases that use a template to select and position their incoming, nucleotides. The first two domains are functionally analogous to, polymerase palm and fingers domains. The third domain is attached to the, fingers domain and is known to interact with the single-stranded RNA, primer. In the nucleotide complex, two molecules of 3'-dATP are bound to, Pap1. One occupies the position of the incoming base, prior to its, addition to the mRNA chain. The other is believed to occupy the position, of the 3' end of the mRNA primer.
About this Structure
1FA0 is a Single protein structure of sequence from Saccharomyces cerevisiae with MN, 3AT, 3AD and POP as ligands. Active as Polynucleotide adenylyltransferase, with EC number 2.7.7.19 Full crystallographic information is available from OCA.
Reference
Structure of yeast poly(A) polymerase alone and in complex with 3'-dATP., Bard J, Zhelkovsky AM, Helmling S, Earnest TN, Moore CL, Bohm A, Science. 2000 Aug 25;289(5483):1346-9. PMID:10958780
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