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Molecular and Cellular Biology, February 2000, p. 1254-1262, Vol. 20, No. 4
MRC Cell Mutation Unit, University of Sussex,
Brighton BN1 9RR, United Kingdom1;
Department of Molecular Biology, Lundberg Laboratory,
Göteborg University, S-413 90 Göteborg,
Sweden2; and MEMOREC Stoffel GmbH,
D-50829 Cologne, Germany3
Received 11 August 1999/Returned for modification 21 September
1999/Accepted 12 November 1999
Hus1 is one of six checkpoint Rad proteins required for all
Schizosaccharomyces pombe DNA integrity
checkpoints. MYC-tagged Hus1 reveals four discrete forms. The main
form, Hus1-B, participates in a protein complex with Rad9 and
Rad1, consistent with reports that Rad1-Hus1 immunoprecipitation is
dependent on the rad9+ locus. A small
proportion of Hus1-B is intrinsically phosphorylated in undamaged cells
and more becomes phosphorylated after irradiation. Hus1-B
phosphorylation is not increased in cells blocked in early S phase with
hydroxyurea unless exposure is prolonged. The Rad1-Rad9-Hus1-B complex is readily detectable, but upon cofractionation of soluble extracts, the majority of each protein is not present in this complex. Indirect immunofluorescence demonstrates that Hus1 is nuclear and that this localization depends on Rad17. We show that Rad17
defines a distinct protein complex in soluble extracts that is separate
from Rad1, Rad9, and Hus1. However, two-hybrid interaction, in vitro
association and in vivo overexpression experiments suggest a transient
interaction between Rad1 and Rad17.
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Characterization of Schizosaccharomyces pombe
Hus1: a PCNA-Related Protein That Associates with Rad1
and Rad9
*
Corresponding author. Mailing address: MRC Cell
Mutation Unit, Brighton BN1 9RR, United Kingdom. Phone:
0044-1273-678-122. Fax: 0044-1273-678-121. E-mail:
a.m.carr{at}sussex.ac.uk.
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