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Molecular and Cellular Biology, October 1999, p. 7123-7137, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Hsl7 Localizes to a Septin Ring and Serves as an
Adapter in a Regulatory Pathway That Relieves Tyrosine
Phosphorylation of Cdc28 Protein Kinase in
Saccharomyces cerevisiae
Mark J.
Shulewitz,
Carla J.
Inouye,
and
Jeremy
Thorner*
Department of Molecular and Cell Biology,
Division of Biochemistry and Molecular Biology, University of
California, Berkeley, California 94720-3202
Received 25 March 1999/Returned for modification 13 May
1999/Accepted 22 June 1999
Successful mitosis requires faithful DNA replication, spindle
assembly, chromosome segregation, and cell division. In the budding
yeast Saccharomyces cerevisiae, the G2-to-M
transition requires activation of Clb-bound forms of the protein
kinase, Cdc28. These complexes are held in an inactive state via
phosphorylation of Tyr19 in the ATP-binding loop of Cdc28 by the Swe1
protein kinase. The HSL1 and HSL7 gene products
act as negative regulators of Swe1. Hsl1 is a large (1,518-residue)
protein kinase with an N-terminal catalytic domain and a very long
C-terminal extension. Hsl1 localizes to the incipient site of
cytokinesis in the bud neck in a septin-dependent manner; however, the
function of Hsl7 was not previously known. Using both indirect
immunofluorescence with anti-Hsl7 antibodies and a fusion of Hsl7 to
green fluorescent protein, we found that Hsl7 also localizes to the bud
neck, congruent with the septin ring that faces the daughter cell. Both
Swe1 and a segment of the C terminus of Hsl1 (which has no sequence
counterpart in two Hsl1-related protein kinases, Gin4 and Kcc4) were
identified as gene products that interact with Hsl7 in a two-hybrid
screen of a random S. cerevisiae cDNA library. Hsl7 plus
Swe1 and Hsl7 plus Hsl1 can be coimmunoprecipitated from extracts of
cells overexpressing these proteins, confirming that Hsl7 physically
associates with both partners. Also consistent with the two-hybrid
results, Hsl7 coimmunoprecipitates with full-length Hsl1 less
efficiently than with a C-terminal fragment of Hsl1. Moreover, Hsl7
does not localize to the bud neck in an hsl1
mutant,
whereas Hsl1 is localized normally in an hsl7
mutant.
Phosphorylation and ubiquitinylation of Swe1, preludes to its
destruction, are severely reduced in cells lacking either Hsl1 or Hsl7
(or both), as judged by an electrophoretic mobility shift assay.
Collectively, these data suggest that formation of the septin rings
provides sites for docking Hsl1, exposing its C terminus and thereby
permitting recruitment of Hsl7. Hsl7, in turn, presents its cargo of
bound Swe1, allowing phosphorylation by Hsl1. Thus, Hsl1 and Hsl7
promote proper timing of cell cycle progression by coupling septin ring
assembly to alleviation of Swe1-dependent inhibition of Cdc28.
Furthermore, like septins and Hsl1, homologs of Hsl7 are found in
fission yeast, flies, worms, and humans, suggesting that its function
in this control mechanism may be conserved in all eukaryotes.
*
Corresponding author. Mailing address: Department of
Molecular and Cell Biology, Room 401, Barker Hall, Corner of Hearst and Oxford St., Berkeley, CA 94720-3202. Phone: (510) 642-2558. Fax: (510)
643-5035. E-mail: jeremy{at}socrates.berkeley.edu.

Present address: Tjian Laboratory, Howard Hughes Medical Institute,
University of California, Berkeley, CA 94720-3204.
Molecular and Cellular Biology, October 1999, p. 7123-7137, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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