Replication protein A is sequentially phosphorylated during meiosis.
Phosphorylation of the cellular single-stranded DNA-binding protein, replication protein A (RPA), occurs during normal mitotic cell cycle progression and also in response to genotoxic stress. In budding yeast, these reactions require the ATM homolog Mec1, a central regulator of the DNA replication and DNA damage checkpoint responses. We now demonstrate that the middle subunit of yeast RPA (Rfa2) becomes phosphorylated in two discrete steps during meiosis. Primary Rfa2 phosphorylation occurs early in meiotic progression and is independent of DNA replication, recombination and Mec1. In contrast, secondary Rfa2 phosphorylation is activated upon initiation of recombination and requires Mec1. While the primary Rfa2 phosphoisomer is detectable throughout most of meiosis, the secondary Rfa2 phosphoisomer is only transiently generated and begins to disappear soon after recombination is complete. Extensive secondary Rfa2 phosphorylation is observed in a recombination mutant defective for the pachytene checkpoint, indicating that Mec1-dependent Rfa2 phosphorylation does not function to maintain meiotic delay in response to DNA double-strand breaks. Our results suggest that Mec1-dependent RPA phosphorylation could be involved in regulating recombination rather than cell cycle or meiotic progression.
Brush
G S
GS
Program in Molecular Biology and Genetics, Karmanos Cancer Institute, Wayne State University, 110 East Warren Avenue, Detroit, MI 48201, USA. brus_hg@karmanos.org
Clifford
D M
DM
Marinco
S M
SM
Bartrand
A J
AJ
D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000378:metabolism*; D005656:Fungal Proteins / Q000502:physiology; D016695:Glycosyltransferases / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D007700:Kinetics; D008540:Meiosis; D008954:Models, Biological; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases; D011995:Recombination, Genetic; D051716:Replication Protein A; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D047908:Intracellular Signaling Peptides and Proteins; C082727:RFA2 protein, S cerevisiae; D051716:Replication Protein A; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D016695:Glycosyltransferases; C088937:MEC1 protein, S cerevisiae; D017346:Protein Serine-Threonine Kinases