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Molecular and Cellular Biology, July 2001, p. 4311-4320, Vol. 21, No. 13
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.13.4311-4320.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Essential Roles of Snf5p in Snf-Swi Chromatin
Remodeling In Vivo
Fuqiang
Geng,
Yixue
Cao,
and
Brehon C.
Laurent*
Department of Microbiology and Immunology and
Morse Institute of Molecular Biology and Genetics, State University
of New York, Brooklyn, New York 11203
Received 30 January 2001/Returned for modification 13 March
2001/Accepted 12 April 2001
Snf-Swi, the prototypical ATP-dependent nucleosome-remodeling
complex, regulates transcription of a subset of yeast genes. With the
exception of Snf2p, the ATPase subunit, the functions of the other
components are unknown. We have investigated the role of the conserved
Snf-Swi core subunit Snf5p through characterization of two conditional
snf5 mutants. The mutants contain single amino acid
alterations of invariant or conserved residues that abolish Snf-Swi-dependent transcription by distinct mechanisms. One mutation impairs Snf-Swi assembly and, consequently, its stable association with
a target promoter. The other blocks a postrecruitment catalytic remodeling step. These findings suggest that Snf5p coordinates the
assembly and nucleosome-remodeling activities of Snf-Swi.
*
Corresponding author. Mailing address: Department of
Microbiology and Immunology, Morse Institute of Moleular Biology and Genetics, S.U.N.Y., 450 Clarkson Ave., Box 44, Brooklyn, NY 11203-2098. Phone: (718) 270-3755. Fax: (718) 270-2656. E-mail:
blaurent{at}netmail.hscbklyn.edu.

Present address: Department of Pharmacology, University of
California, San Diego, CA
92093.
Molecular and Cellular Biology, July 2001, p. 4311-4320, Vol. 21, No. 13
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.13.4311-4320.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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