Affiliation:
1. Department of Cell Biology, 1 Vanderbilt University School of Medicine, Nashville, Tennessee 37232
2. Howard Hughes Medical Institute 2 and
Abstract
ABSTRACT
The
Schizosaccharomyces pombe dim1
+
gene is required for entry into mitosis and for chromosome segregation during mitosis. To further understand dim1p function, we undertook a synthetic lethal screen with the temperature-sensitive
dim1-35
mutant and isolated
lid
(for lethal in
dim1-35
) mutants. Here, we describe the temperature-sensitive
lid1-6
mutant. At the restrictive temperature of 36°C,
lid1-6
mutant cells arrest with a “cut” phenotype similar to that of
cut4
and
cut9
mutants. An epitope-tagged version of lid1p is a component of a multiprotein ∼20S complex; the presence of lid1p in this complex depends upon functional
cut9
+
. lid1p-myc coimmunoprecipitates with several other proteins, including cut9p and nuc2p, and the presence of cut9p in a 20S complex depends upon the activity of
lid1
+
. Further,
lid1
+
function is required for the multiubiquitination of cut2p, an anaphase-promoting complex or cyclosome (APC/C) target. Thus, lid1p is a component of the
S. pombe
APC/C. In
dim1
mutants, the abundances of lid1p and the APC/C complex decline significantly, and the ubiquitination of an APC/C target is abolished. These data suggest that at least one role of dim1p is to maintain or establish the steady-state level of the APC/C.
Publisher
American Society for Microbiology
Subject
Cell Biology,Molecular Biology
Cited by
36 articles.
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