TY - JOUR
T1 - The fission yeast septation initiation network (SIN) kinase, Sid2, is required for SIN asymmetry and regulates the SIN scaffold, Cdc11
AU - Feoktistova, Anna
AU - Morrell-Falvey, Jennifer
AU - Chen, Jun Song
AU - Singh, N. Sadananda
AU - Balasubramanian, Mohan K.
AU - Gould, Kathleen L.
PY - 2012/5/1
Y1 - 2012/5/1
N2 - The Schizosaccharomyces pombe septation initiation network (SIN) is an Spg1-GTPase - mediated protein kinase cascade that triggers actomyosin ring constriction, septation, and cell division. The SIN is assembled at the spindle pole body (SPB) on the scaffold proteins Cdc11 and Sid4, with Cdc11 binding directly to SIN signaling components. Proficient SIN activity requires the asymmetric distribution of its signaling components to one of the two SPBs during anaphase, and Cdc11 hyperphosphorylation correlates with proficient SIN activity. In this paper, we show that the last protein kinase in the signaling cascade, Sid2, feeds back to phosphorylate Cdc11 during mitosis. The characterization of Cdc11 phosphomutants provides evidence that Sid2-mediated Cdc11 phosphorylation promotes the association of the SIN kinase, Cdc7, with the SPB and maximum SIN signaling during anaphase. We also show that Sid2 is crucial for the establishment of SIN asymmetry, indicating a positive-feedback loop is an important element of the SIN.
AB - The Schizosaccharomyces pombe septation initiation network (SIN) is an Spg1-GTPase - mediated protein kinase cascade that triggers actomyosin ring constriction, septation, and cell division. The SIN is assembled at the spindle pole body (SPB) on the scaffold proteins Cdc11 and Sid4, with Cdc11 binding directly to SIN signaling components. Proficient SIN activity requires the asymmetric distribution of its signaling components to one of the two SPBs during anaphase, and Cdc11 hyperphosphorylation correlates with proficient SIN activity. In this paper, we show that the last protein kinase in the signaling cascade, Sid2, feeds back to phosphorylate Cdc11 during mitosis. The characterization of Cdc11 phosphomutants provides evidence that Sid2-mediated Cdc11 phosphorylation promotes the association of the SIN kinase, Cdc7, with the SPB and maximum SIN signaling during anaphase. We also show that Sid2 is crucial for the establishment of SIN asymmetry, indicating a positive-feedback loop is an important element of the SIN.
UR - http://www.scopus.com/inward/record.url?scp=84860354280&partnerID=8YFLogxK
U2 - 10.1091/mbc.E11-09-0792
DO - 10.1091/mbc.E11-09-0792
M3 - Article
C2 - 22419817
AN - SCOPUS:84860354280
SN - 1059-1524
VL - 23
SP - 1636
EP - 1645
JO - Molecular Biology of the Cell
JF - Molecular Biology of the Cell
IS - 9
ER -