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Sgs1 : ウィキペディア英語版
Sgs1

Sgs1, also known as slow growth suppressor 1, is a DNA helicase protein found in ''Saccharomyces cerevisiae''. It is a homolog of the bacterial RecQ helicase. Like the other members of the RecQ helicase family, Sgs1 is important for DNA repair. In particular, Sgs1 collaborates with other proteins to repair double-strand breaks during homologous recombination in eukaryotes.
==Meiosis==

The Sgs1(BLM) helicase is an ortholog of the human Bloom syndrome protein. It appears to be a central regulator of most of the recombination events that occur during ''S. cerevisiae'' meiosis. During normal meiosis Sgs1(BLM) is responsible for directing recombination towards the alternate formation of either early non-crossover recombinants (NCOs) or Holliday junction joint molecules, the latter being subsequently resolved as crossovers (COs) (see Figure).〔 The several roles of Sgs1 in meiotic recombination were reviewed by Klein and Symington. Primarily, Sgs1 displaces the strand invasion intermediate that initiates recombination, thus facilitating NCO recombination (see Homologous recombination and Bloom syndrome protein).
Sgs1 also has a role in a pathway leading to CO recombinants. Sgs1 together with EXO1 and MLH1-MLH3 heterodimer (MutL gamma) define a joint molecule resolution pathway that produces the majority of crossovers in budding yeast, and by inference, in mammals.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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