The Journal of Cell Biology, Vol 125, 1289-1301, Copyright © 1994 by The Rockefeller University Press

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The Schizosaccharomyces pombe cdc3+ gene encodes a profilin essential for cytokinesis

MK Balasubramanian, BR Hirani, JD Burke and KL Gould
Department of Cell Biology, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232.

The fission yeast Schizosaccharomyces pombe divides by medial fission and, like many higher eukaryotic cells, requires the function of an F- actin contractile ring for cytokinesis. In S. pombe, a class of cdc- mutants defective for cytokinesis, but not for DNA replication, mitosis, or septum synthesis, have been identified. In this paper, we present the characterization of one of these mutants, cdc3-124. Temperature shift experiments reveal that mutants in cdc3 are incapable of forming an F-actin contractile ring. We have molecularly cloned cdc3 and used the cdc3+ genomic DNA to create a strain carrying a cdc3 null mutation by homologous recombination in vivo. Cells bearing a cdc3-null allele are inviable. They arrest the cell cycle at cytokinesis without forming a contractile ring. DNA sequence analysis of the cdc3+ gene reveals that it encodes profilin, an actin-monomer-binding protein. In light of recent studies with profilins, we propose that Cdc3-profilin plays an essential role in cytokinesis by catalyzing the formation of the F-actin contractile ring. Consistent with this proposal are our observations that Cdc3-profilin localizes to the medial region of the cell where the F-actin contractile ring forms, and that it is essential for F-actin ring formation. Cells overproducing Cdc3-profilin become elongated, dumbbell shaped, and arrest at cytokinesis without any detectable F-actin staining. This effect of Cdc3-profilin overproduction is relieved by introduction of a multicopy plasmid carrying the actin encoding gene, act1+. We attribute these effects to potential sequestration of actin monomers by profilin, when present in excess.
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