期刊
EMBO JOURNAL
卷 19, 期 13, 页码 3388-3397出版社
OXFORD UNIV PRESS
DOI: 10.1093/emboj/19.13.3388
关键词
chromatin; DNA repair; RING finger; SNF2; SWI2 homolog; ubiquitin-conjugating enzyme
Two ubiquitin-conjugating enzymes, RAD6 and the heteromeric UBC13-MMS2 complex, have been implicated in post-replicative DNA damage repair in yeast. Here we provide a mechanistic basis for cooperation between the two enzymes. We show that two chromatin-associated RING finger proteins, RAD18 and RAD5, play a central role in mediating physical contacts between the members of the RAD6 pathway. RADS recruits the UBC13-MMS2 complex to DNA by means of its RING finger domain. Moreover, RADS association with RAD18 brings UBC13-MMS2 into contact with the RAD6-RAD18 complex. Interaction between the two RING finger proteins thus promotes the formation of a heteromeric complex in which the two distinct ubiquitin-conjugating activities of RAD6 and UBC13-MMS2 can be closely coordinated. Surprisingly, UBC13 and MMS2 are largely cytosolic proteins, but DNA damage triggers their redistribution to the nucleus. These findings suggest a mechanism by which the activity of this DNA repair pathway could be regulated.
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