RRC ID 12489
Author Yan H, Ge W, Chew TG, Chow JY, McCollum D, Neiman AM, Balasubramanian MK.
Title The meiosis-specific Sid2p-related protein Slk1p regulates forespore membrane assembly in fission yeast.
Journal Mol Biol Cell
Abstract Cytokinesis in all organisms involves the creation of membranous barriers that demarcate individual daughter cells. In fission yeast, a signaling module termed the septation initiation network (SIN) plays an essential role in the assembly of new membranes and cell wall during cytokinesis. In this study, we have characterized Slk1p, a protein-kinase related to the SIN component Sid2p. Slk1p is expressed specifically during meiosis and localizes to the spindle pole bodies (SPBs) during meiosis I and II in a SIN-dependent manner. Slk1p also localizes to the forespore membrane during sporulation. Cells lacking Slk1p display defects associated with sporulation, leading frequently to the formation of asci with smaller and/or fewer spores. The ability of slk1 Delta cells to sporulate, albeit inefficiently, is fully abolished upon compromise of function of Sid2p, suggesting that Slk1p and Sid2p play overlapping roles in sporulation. Interestingly, increased expression of the syntaxin Psy1p rescues the sporulation defect of sid2-250 slk1 Delta. Thus, it is likely that Slk1p and Sid2p play a role in forespore membrane assembly by facilitating recruitment of components of the secretory apparatus, such as Psy1p, to allow membrane expansion. These studies thereby provide a novel link between the SIN and vesicle trafficking during cytokinesis.
Volume 19(9)
Pages 3676-90
Published 2008-9
DOI 10.1091/mbc.e07-10-1060
PII E07-10-1060
PMID 18562696
PMC PMC2526688
MeSH Amino Acid Sequence Cell Membrane / metabolism Cytokinesis Gene Expression Regulation, Enzymologic* Gene Expression Regulation, Fungal* Green Fluorescent Proteins / metabolism Meiosis* Mitogen-Activated Protein Kinase Kinases / metabolism* Models, Biological Molecular Sequence Data Protein Kinases / metabolism* Qa-SNARE Proteins / metabolism Saccharomyces cerevisiae Proteins / metabolism* Schizosaccharomyces / genetics* Schizosaccharomyces / physiology* Schizosaccharomyces pombe Proteins / metabolism* Sequence Homology, Amino Acid Signal Transduction
IF 3.905
Times Cited 15
Yeast ?