Synaptonemal complex morphogenesis and sister-chromatid cohesion require Mek1-dependent phosphorylation of a meiotic chromosomal protein.
Development of yeast meiotic chromosome cores into full-length synaptonemal complexes requires the MEK1 gene product, a meiosis-specific protein kinase homolog. The Mek1 protein associates with meiotic chromosomes and colocalizes with the Red1 protein, which is a component of meiotic chromosome cores. Mek1 and Red1 interact physically in meiotic cells, as demonstrated by coimmunoprecipitation and the two-hybrid protein system. Hop1, another protein associated with meiotic chromosome cores, also interacts with Mek1 but only in the presence of Red1. Red1 displays Mek1-dependent phosphorylation, both in vitro and in vivo, and Mek1 kinase activity is necessary for Mek1 function in vivo. Fluorescent in situ hybridization analysis indicates that Mek1- mediated phosphorylation of Red1 is required for meiotic sister-chromatid cohesion, raising the possibility that cohesion is regulated by protein phosphorylation.[1]References
- Synaptonemal complex morphogenesis and sister-chromatid cohesion require Mek1-dependent phosphorylation of a meiotic chromosomal protein. Bailis, J.M., Roeder, G.S. Genes Dev. (1998) [Pubmed]
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