3bi3: Difference between revisions

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[[Image:3bi3.jpg|left|200px]]
{{Seed}}
[[Image:3bi3.png|left|200px]]


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{{STRUCTURE_3bi3|  PDB=3bi3  |  SCENE=  }}  
{{STRUCTURE_3bi3|  PDB=3bi3  |  SCENE=  }}  


'''X-ray structure of AlkB protein bound to dsDNA containing 1meA/A with cofactors'''
===X-ray structure of AlkB protein bound to dsDNA containing 1meA/A with cofactors===




==Overview==
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Escherichia coli AlkB and its human homologues ABH2 and ABH3 repair DNA/RNA base lesions by using a direct oxidative dealkylation mechanism. ABH2 has the primary role of guarding mammalian genomes against 1-meA damage by repairing this lesion in double-stranded DNA (dsDNA), whereas AlkB and ABH3 preferentially repair single-stranded DNA (ssDNA) lesions and can repair damaged bases in RNA. Here we show the first crystal structures of AlkB-dsDNA and ABH2-dsDNA complexes, stabilized by a chemical cross-linking strategy. This study reveals that AlkB uses an unprecedented base-flipping mechanism to access the damaged base: it squeezes together the two bases flanking the flipped-out one to maintain the base stack, explaining the preference of AlkB for repairing ssDNA lesions over dsDNA ones. In addition, the first crystal structure of ABH2, presented here, provides a structural basis for designing inhibitors of this human DNA repair protein.
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{{ABSTRACT_PUBMED_18432238}}


==About this Structure==
==About this Structure==
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[[Category: Oxidoreductase/dna complex]]
[[Category: Oxidoreductase/dna complex]]
[[Category: Protein dna interaction]]
[[Category: Protein dna interaction]]
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Revision as of 20:32, 28 July 2008

File:3bi3.png

Template:STRUCTURE 3bi3

X-ray structure of AlkB protein bound to dsDNA containing 1meA/A with cofactors

Template:ABSTRACT PUBMED 18432238

About this Structure

3BI3 is a Protein complex structure of sequences from Escherichia coli k12. Full crystallographic information is available from OCA.

Reference

Crystal structures of DNA/RNA repair enzymes AlkB and ABH2 bound to dsDNA., Yang CG, Yi C, Duguid EM, Sullivan CT, Jian X, Rice PA, He C, Nature. 2008 Apr 24;452(7190):961-5. PMID:18432238

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