Reference: Koehn DR, et al. (2009) Tethering Recombination Initiation Proteins in Saccharomyces cerevisiae Promotes Double Strand Break Formation. Genetics 182(2):447-58

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Abstract


Meiotic recombination in Saccharomyces cerevisiae is initiated by the creation of DNA double strand breaks (DSBs), an event requiring ten recombination initiation proteins. Published data indicate that these ten proteins form three main interaction subgroups [(Spo11-Rec102-Rec104-Ski8), (Rec114-Rec107-Mei4), and (Mre11-Rad50-Xrs2)], but certain components from each subgroup may also interact. Although several of the protein-protein interactions have been defined, the mechanism for DSB formation has been challenging to define. Using a variation of the approach pioneered by Pecina et al. (2002), we have tethered eight of the ten initiation proteins to a recombination coldspot and discovered that in addition to Spo11, six others (Rec102, Rec104, Ski8, Rec114, Rec107, and Mei4) promote DSB formation at the coldspot, albeit with different frequencies. Of the eight proteins tested, only Mre11 was unable to cause DSBs even though it binds to UASGAL at GAL2. Our results suggest there may be several ways that the recombination initiation proteins can associate to form a functional initiation complex that can create DSBs.

Reference Type
Journal Article
Authors
Koehn DR, Haring SJ, Williams JM, Malone RE
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