Structures of human exonuclease 1 DNA complexes suggest a unified mechanism for nuclease family.
Structures of human exonuclease 1 DNA complexes suggest a unified mechanism for nuclease family.
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DOI:
10.1016/j.cell.2011.03.005
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发表时间:
2011-04-15
期刊:
影响因子:
64.5
通讯作者:
Beese LS
中科院分区:
文献类型:
--
作者:
Orans J;McSweeney EA;Iyer RR;Hast MA;Hellinga HW;Modrich P;Beese LS
Human exonuclease 1 (hExo1) plays important roles in DNA repair and recombination processes that maintain genomic integrity. It is a member of the 5′ structure-specific nuclease family of exonucleases and endonucleases that includes FEN-1, XPG, and GEN1. We present structures of hExo1 in complex with a DNA substrate, followed by mutagenesis studies, and propose a common mechanism by which this nuclease family recognizes and processes diverse DNA structures. hExo1 induces a sharp bend in the DNA at nicks or gaps. Frayed 5′ ends of nicked duplexes resemble flap junctions, unifying the mechanisms of endo- and exo-nucleolytic processing. Conformational control of a mobile region in the catalytic site suggests a mechanism for allosteric regulation by binding to protein partners. The relative arrangement of substrate binding sites in these enzymes provides an elegant solution to a complex geometrical puzzle of substrate recognition and processing.
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影响因子:
14.9
作者:
Hohl M;Dunand-Sauthier I;Staresincic L;Jaquier-Gubler P;Thorel F;Modesti M;Clarkson SG;Schärer OD
通讯作者:
Schärer OD
DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
Emsley, P;Cowtan, K
通讯作者:
Cowtan, K
影响因子:
4.8
作者:
Genschel, J;Bazemore, LR;Modrich, P
通讯作者:
Modrich, P
影响因子:
4.8
作者:
Doherty, KM;Sharma, S;Brosh, RM
通讯作者:
Brosh, RM
DOI:
10.1107/s0907444998003254
发表时间:
1998-09-01
期刊:
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
影响因子:
--
作者:
Brunger, AT;Adams, PD;Warren, GL
通讯作者:
Warren, GL