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Volume 271, Number 23, Issue of June 7, 1996 pp. 13542-13548
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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Regulatory Function of Delta/YY-1 on the Locus Control Region-like Sequence of Mouse Glycophorin Gene in Erythroleukemia Cells

(Received for publication, October 20, 1995, and in revised form, February 27, 1996)

From the Department of Cell Biology, Institute of Development, Aging and Cancer, Tohoku University, Seiryomachi 4-1, Aoba-ku, Sendai 980-77, Japan

The far upstream region (1.2-0.9 kilobase pairs) of the mouse glycophorin gene contains the locus control region (LCR)-like region, which acts as an erythroid-specific enhancer dependent on chromosomal integration in murine erythroleukemia (MEL) cells. In the present study, we demonstrated that this region binds six nuclear factors. The binding of GATA-1 to corresponding sites did not show any change before or after induction with dimethyl sulfoxide, but the binding of Spi-1/PU.l and an unidentified factor called glycophorin regulatory element binding factor (GRBF) showed a change during induction. While binding activity of Spi-l/PU.l dropped soon after induction, the GRBF activity increased after induction when expression of the glycophorin gene began. After identification of the consensus binding site of GRBF, we cloned cDNA for that factor by Southwestern method, and it was identified as a previously reported transcription factor, delta, a murine form of YY-l which is a versatile transcription factor. Mutation analysis in the delta/YY-1 binding site within the LCR-like region indicated that delta/YY-1 acts as a regulatory protein in combination with the E-box-binding protein that binds to the neighboring sequence.

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