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The Ubc9 SUMO-conjugating enzyme and the Siz1 SUMO ligase sumoylate several repair and recombination proteins, including PCNA. Sumoylated PCNA binds Srs2, a helicase counteracting certain recombination events. Here we show that ubc9 mutants depend on checkpoint, recombination, and replication genes for growth. ubc9 cells maintain stalled-fork stability but exhibit a Rad51-dependent accumulation of...
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