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2p5g

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[[Image:2p5g.gif|left|200px]]
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{{STRUCTURE_2p5g| PDB=2p5g | SCENE= }}
{{STRUCTURE_2p5g| PDB=2p5g | SCENE= }}
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'''Crystal structure of RB69 gp43 in complex with DNA with dAMP opposite an abasic site analog in a 21mer template'''
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===Crystal structure of RB69 gp43 in complex with DNA with dAMP opposite an abasic site analog in a 21mer template===
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==Overview==
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Damage to DNA involving excision of the nucleobase at the N-glycosidic bond forms abasic sites. If a nucleotide becomes incorporated opposite an unrepaired abasic site during DNA synthesis, most B family polymerases obey the A-rule and preferentially incorporate dAMP without instruction from the template. In addition to being potentially mutagenic, abasic sites provide strong blocks to DNA synthesis. A previous crystal structure of an exonuclease deficient variant of the replicative B family DNA polymerase from bacteriophage RB69 (RB69 gp43 exo-) illustrated these properties, showing that the polymerase failed to translocate the DNA following insertion of dAMP opposite an abasic site. We examine four new structures depicting several steps of translesion DNA synthesis by RB69 gp43 exo-, employing a non-natural purine triphosphate analogue, 5-nitro-1-indolyl-2'-deoxyriboside-5'-triphosphate (5-NITP), that is incorporated more efficiently than dAMP opposite abasic sites. Our structures indicate that a dipole-induced dipole stacking interaction between the 5-nitro group and base 3' to the templating lesion explains the enhanced kinetics of 5-NITP. As with dAMP, the DNA fails to translocate following insertion of 5-NIMP, although distortions at the nascent primer terminus contribute less than previously thought in inducing the stall, given that 5-NIMP preserves relatively undistorted geometry at the insertion site following phosphoryl transfer. An open ternary configuration, novel in B family polymerases, reveals an initial template independent binding of 5-NITP adjacent to the active site of the open polymerase, suggesting that closure of the fingers domain shuttles the nucleotide to the active site while testing the substrate against the template.
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{{ABSTRACT_PUBMED_17718515}}
==About this Structure==
==About this Structure==
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[[Category: Dna polymerase]]
[[Category: Dna polymerase]]
[[Category: Transferase/dna complex]]
[[Category: Transferase/dna complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 06:59:50 2008''

Revision as of 03:59, 29 July 2008

Image:2p5g.png

Template:STRUCTURE 2p5g

Crystal structure of RB69 gp43 in complex with DNA with dAMP opposite an abasic site analog in a 21mer template

Template:ABSTRACT PUBMED 17718515

About this Structure

2P5G is a Protein complex structure of sequences from Enterobacteria phage rb69. Full crystallographic information is available from OCA.

Reference

Caught bending the A-rule: crystal structures of translesion DNA synthesis with a non-natural nucleotide., Zahn KE, Belrhali H, Wallace SS, Doublie S, Biochemistry. 2007 Sep 18;46(37):10551-61. Epub 2007 Aug 24. PMID:17718515

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