2q2t: Difference between revisions

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{{STRUCTURE_2q2t|  PDB=2q2t  |  SCENE=  }}  
{{STRUCTURE_2q2t|  PDB=2q2t  |  SCENE=  }}  


'''Structure of Chlorella virus DNA ligase-adenylate bound to a 5' phosphorylated nick'''
===Structure of Chlorella virus DNA ligase-adenylate bound to a 5' phosphorylated nick===




==Overview==
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Chlorella virus DNA ligase, the smallest eukaryotic ligase known, has pluripotent biological activity and an intrinsic nick-sensing function, despite having none of the accessory domains found in cellular ligases. A 2.3-A crystal structure of the Chlorella virus ligase-AMP intermediate bound to duplex DNA containing a 3'-OH-5'-PO4 nick reveals a new mode of DNA envelopment, in which a short surface loop emanating from the OB domain forms a beta-hairpin 'latch' that inserts into the DNA major groove flanking the nick. A network of interactions with the 3'-OH and 5'-PO4 termini in the active site illuminates the DNA adenylylation mechanism and the crucial roles of AMP in nick sensing and catalysis. Addition of a divalent cation triggered nick sealing in crystallo, establishing that the nick complex is a bona fide intermediate in the DNA repair pathway.
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==About this Structure==
==About this Structure==
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[[Category: Lysine adenylate]]
[[Category: Lysine adenylate]]
[[Category: Protein-dna complex]]
[[Category: Protein-dna complex]]
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