Fission yeast MO25 protein is localized at SPB and septum and is essential for cell morphogenesis.
Cell morphogenesis is of fundamental significance in all eukaryotes for development, differentiation, and cell proliferation. In fission yeast, Drosophila Furry-like Mor2 plays an essential role in cell morphogenesis in concert with the NDR/Tricornered kinase Orb6. Mutations of these genes result in the loss of cell polarity. Here we show that the conserved proteins, MO25-like Pmo25, GC kinase Nak1, Mor2, and Orb6, constitute a morphogenesis network that is important for polarity control and cell separation. Intriguingly, Pmo25 was localized at the mitotic spindle pole bodies (SPBs) and then underwent translocation to the dividing medial region upon cytokinesis. Pmo25 formed a complex with Nak1 and was required for both the localization and kinase activity of Nak1. Pmo25 and Nak1 in turn were essential for Orb6 kinase activity. Further, the Pmo25 localization at the SPBs and the Nak1-Orb6 kinase activities during interphase were under the control of the Cdc7 and Sid1 kinases in the septation initiation network (SIN), suggesting a functional linkage between SIN and the network for cell morphogenesis/separation following cytokinesis.
Kanai
Muneyoshi
M
Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi Hiroshima, Japan.
Kume
Kazunori
K
Miyahara
Kohji
K
Sakai
Keisuke
K
Nakamura
Keigo
K
Leonhard
Klaus
K
Wiley
David J
DJ
Verde
Fulvia
F
Toda
Takashi
T
Hirata
Dai
D
D000595:Amino Acid Sequence; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D016764:Cell Polarity; D017124:Conserved Sequence; D029721:Drosophila Proteins / Q000235:genetics; D008840:Microfilament Proteins / Q000235:genetics / Q000378:metabolism; D008870:Microtubules / Q000502:physiology; D009024:Morphogenesis; D011485:Protein Binding; D011494:Protein Kinases / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D012568:Schizosaccharomyces / Q000254:growth & development / Q000502:physiology*; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics / Q000378:metabolism*; D008941:Spindle Apparatus / Q000378:metabolism*
D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D029721:Drosophila Proteins; D008840:Microfilament Proteins; C100024:Mo25 protein, Drosophila; C467580:Mor2 protein, S pombe; D029702:Schizosaccharomyces pombe Proteins; D011494:Protein Kinases; C113424:Orb6 protein, S pombe; C409036:Sid1 kinase; C489406:cdc7 protein, S pombe; C500976:Nak1 protein, S pombe; D017346:Protein Serine-Threonine Kinases