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Molecular and Cellular Biology, December 1998, p. 7176-7184, Vol. 18, No. 12
Department of Biochemistry1 and
Vanderbilt Cancer Center,2 Vanderbilt
University School of Medicine, Nashville, Tennessee 37232;
Department of Biochemistry and Molecular Biology, University of
Manitoba, Winnipeg, Manitoba R3E 0W3, Canada3;
Biochemistry,
Received 16 July 1998/Returned for modification 18 August
1998/Accepted 27 August 1998
t(8;21) is one of the most frequent translocations associated with
acute myeloid leukemia. It produces a chimeric protein, acute myeloid
leukemia-1 (AML-1)-eight-twenty-one (ETO), that contains the
amino-terminal DNA binding domain of the AML-1 transcriptional regulator fused to nearly all of ETO. Here we demonstrate that ETO
interacts with the nuclear receptor corepressor N-CoR, the mSin3
corepressors, and histone deacetylases. Endogenous ETO also cosediments
on sucrose gradients with mSin3A, N-CoR, and histone deacetylases,
suggesting that it is a component of one or more corepressor complexes.
Deletion mutagenesis indicates that ETO interacts with mSin3A
independently of its association with N-CoR. Single amino acid
mutations that impair the ability of ETO to interact with the central
portion of N-CoR affect the ability of the t(8;21) fusion protein to
repress transcription. Finally, AML-1/ETO associates with histone
deacetylase activity and a histone deacetylase inhibitor impairs the
ability of the fusion protein to repress transcription. Thus, t(8;21)
fuses a component of a corepressor complex to AML-1 to repress transcription.
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
ETO, a Target of t(8;21) in Acute Leukemia,
Interacts with the N-CoR and mSin3 Corepressors
*
Corresponding author. Mailing address: Department of
Biochemistry, Vanderbilt Cancer Center, Vanderbilt University School of
Medicine, Medical Research Building II, Rm. 512, 23rd and Pierce, Nashville, TN 37232. Phone: (615) 936-3582. Fax: (615) 936-1790. E-mail: scott.hiebert{at}mcmail.vanderbilt.edu.
Molecular and Cellular Biology, December 1998, p. 7176-7184, Vol. 18, No. 12
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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