Regulation of the gene encoding glutathione S-transferase M1 (GSTM1) by the Myb oncoprotein.
The identification of Myb 'target' genes will not only aid in the understanding of how overexpression of Myb, or expression of activated forms of Myb, leads to cellular transformation but will also shed light on its role in normal cells. Using a combination of an estrogen-regulated Myb-transformed cell line (ERMYB) and PCR-based subtractive hybridization, we have identified the gene (GSTM1) encoding the detoxification enzyme glutathione S-transferase M1 as being transcriptionally upregulated by Myb. Functional analysis of the GSTM1 promoter using reporter assays indicated that both the DNA binding and transactivation domains of Myb were required for transcriptional activation. Mutational ana-lysis of consensus Myb-binding sites (MBS) in the promoter and electrophoretic mobility gel shift analysis indicated that one of the three potential MBS can bind Myb protein, and is the primary site involved in the regulation of this promoter by Myb.
Hanson Institute and Division of Human Immunology, Institute of Medical and Veterinary Science, Adelaide 5000, Australia.
Paul A
PA
Bartley
Rebecca A
RA
Keough
Jodi K
JK
Lutwyche
Thomas J
TJ
Gonda
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004958:Estradiol / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D005982:Glutathione Transferase / Q000235:genetics*; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D020626:Oncogene Proteins v-myb / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011960:Receptors, Estrogen / Q000378:metabolism
D004958:Estradiol; D005982:Glutathione Transferase; D020626:Oncogene Proteins v-myb; D012333:RNA, Messenger; D011960:Receptors, Estrogen