Surf Wiki
Save to docs
general/dna-repair

From Surf Wiki (app.surf) — the open knowledge base

Sgs1

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

A current model of meiotic recombination, initiated by a double-strand break or gap, followed by pairing with an homologous chromosome and strand invasion to initiate the recombinational repair process. Repair of the gap can lead to crossover (CO) or non-crossover (NCO) of the flanking regions. CO recombination is thought to occur by the Double Holliday Junction (DHJ) model, illustrated on the right, above. NCO recombinants are thought to occur primarily by the Synthesis Dependent Strand Annealing (SDSA) model, illustrated on the left, above. Most recombination events appear to be the SDSA type.

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). 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.

References

References

  1. Gangloff, S. (December 1994). "The yeast type I topoisomerase Top3 interacts with Sgs1, a DNA helicase homolog: a potential eukaryotic reverse gyrase". Molecular and Cellular Biology.
  2. (9 October 2008). "Sae2, Exo1 and Sgs1 collaborate in DNA double-strand break processing". Nature.
  3. (2012). "BLM helicase ortholog Sgs1 is a central regulator of meiotic recombination intermediate metabolism". Mol. Cell.
  4. (2012). "Sgs1--the maestro of recombination". Cell.
  5. (2012). "Delineation of joint molecule resolution pathways in meiosis identifies a crossover-specific resolvase". Cell.
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

dna-repair
Want to explore this topic further?

Ask Mako anything about Sgs1 — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report