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Molecular and Cellular Biology, August 1999, p. 5535-5547, Vol. 19, No. 8
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
A Fission Yeast Gene,
him1+/dfp1+, Encoding a Regulatory
Subunit for Hsk1 Kinase, Plays Essential Roles in S-Phase
Initiation as Well as in S-Phase Checkpoint Control and
Recovery from DNA Damage
Tadayuki
Takeda,1,2
Keiko
Ogino,1,2
Etsuko
Matsui,1,2
Min Kwan
Cho,1
Hiroyuki
Kumagai,1
Tsuyoshi
Miyake,1,
Ken-ichi
Arai,1,2 and
Hisao
Masai1,2,*
Department of Molecular and Developmental
Biology, Institute of Medical Science, University of Tokyo,
1 and CREST, Japan Science and
Technology Corporation (JST),2 Tokyo 108-8639, Japan
Received 16 February 1999/Returned for modification 8 April
1999/Accepted 19 May 1999
Saccharomyces cerevisiae CDC7 encodes a
serine/threonine kinase required for G1/S transition, and
its related kinases are present in fission yeast as well as in higher
eukaryotes, including humans. Kinase activity of Cdc7 protein depends
on the regulatory subunit, Dbf4, which also interacts with replication
origins. We have identified him1+ from
two-hybrid screening with Hsk1, a fission yeast homologue of Cdc7
kinase, and showed that it encodes a regulatory subunit of Hsk1. Him1,
identical to Dfp1, previously identified as an associated molecule of
Hsk1, binds to Hsk1 and stimulates its kinase activity, which
phosphorylates both catalytic and regulatory subunits as well as
recombinant MCM2 protein in vitro. him1+ is
essential for DNA replication in fission yeast cells, and its
transcription is cell cycle regulated, increasing at middle M to late
G1. The protein level is low at START in G1,
increases at the G1/S boundary, and is maintained at a high
level throughout S phase. Him1 protein is hyperphosphorylated at
G1/S through S during the cell cycle as well as in response
to early S-phase arrest induced by nucleotide deprivation. Deletion of
one of the motifs conserved in regulatory subunits for Cdc7-related
kinases as well as alanine substitution of three serine and threonine residues present in the same motif resulted in a defect in checkpoint regulation normally induced by hydroxyurea treatment. The alanine mutant also showed growth retardation after UV irradiation and the
addition of methylmethane sulfonate. In keeping with this result, a
database search indicates that him1+ is
identical to rad35+. Our results reveal a novel
function of the Cdc7/Dbf4-related kinase complex in S-phase checkpoint
control as well as in growth recovery from DNA damage in addition to
its predicted essential function in S-phase initiation.
*
Corresponding author. Mailing address: Department of
Molecular & Developmental Biology, Institute of Medical Science,
University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan. Phone: 81-3-5449-5661. Fax: 81-3-5449-5424. E-mail:
hisao{at}ims.u-tokyo.ac.jp.
Present address: Department of Biochemistry Health Sciences Center,
University of Virginia, Charlottesville, VA 22908.
Molecular and Cellular Biology, August 1999, p. 5535-5547, Vol. 19, No. 8
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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