2bgw: Difference between revisions
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==Overview== | ==Overview== | ||
The XPF/Mus81 structure-specific endonucleases cleave double-stranded DNA, (dsDNA) within asymmetric branched DNA substrates and play an essential, role in nucleotide excision repair, recombination and genome integrity. We, report the structure of an archaeal XPF homodimer alone and bound to, dsDNA. Superposition of these structures reveals a large domain movement, upon binding DNA, indicating how the (HhH)(2) domain and the nuclease, domain are coupled to allow the recognition of, double-stranded/single-stranded DNA junctions. We identify two, nonequivalent DNA-binding sites and propose a model in which XPF distorts, the 3' flap substrate in order to engage both binding sites and promote, strand cleavage. The model rationalises published biochemical data and, implies a novel role for the . | The XPF/Mus81 structure-specific endonucleases cleave double-stranded DNA, (dsDNA) within asymmetric branched DNA substrates and play an essential, role in nucleotide excision repair, recombination and genome integrity. We, report the structure of an archaeal XPF homodimer alone and bound to, dsDNA. Superposition of these structures reveals a large domain movement, upon binding DNA, indicating how the (HhH)(2) domain and the nuclease, domain are coupled to allow the recognition of, double-stranded/single-stranded DNA junctions. We identify two, nonequivalent DNA-binding sites and propose a model in which XPF distorts, the 3' flap substrate in order to engage both binding sites and promote, strand cleavage. The model rationalises published biochemical data and, implies a novel role for the ERCC1 subunit of eukaryotic XPF complexes. | ||
==About this Structure== | ==About this Structure== | ||
2BGW is a | 2BGW is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Aeropyrum_pernix Aeropyrum pernix] with MG and SO4 as [http://en.wikipedia.org/wiki/ligands ligands]. Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2BGW OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: structure specific endonuclease]] | [[Category: structure specific endonuclease]] | ||
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 12:45:21 2007'' | ||
