Affiliation:
1. Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
Abstract
ABSTRACT
The
Saccharomyces cerevisiae
SAGA complex is required for the normal transcription of a large number of genes. Complex integrity depends on three core subunits, Spt7, Spt20, and Ada1. We have investigated the role of Spt7 in the assembly and function of SAGA. Our results show that Spt7 is important in controlling the levels of the other core subunits and therefore of SAGA. In addition, partial SAGA complexes containing Spt7 can be assembled in the absence of both Spt20 and Ada1. Through biochemical and genetic analyses of a series of
spt7
deletion mutants, we have identified a region of Spt7 required for interaction with the SAGA component Spt8. An adjacent Spt7 domain was found to be required for a processed form of Spt7 that is present in a previously identified altered form of SAGA called SLIK, SAGA
alt
, or SALSA. Analysis of an
spt7
mutant with greatly reduced levels of SLIK/SAGA
alt
/SALSA suggests a subtle role for this complex in transcription that may be redundant with a subset of SAGA functions.
Publisher
American Society for Microbiology
Subject
Cell Biology,Molecular Biology
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