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(Received for publication, July 9, 1996, and in revised form, August 30, 1996)
From the Tyrosinase, tyrosinase-related protein-1 (TRP-1),
and TRP-2 are the enzymes involved in melanin biosynthesis and are
preferentially expressed in pigment cells. Their human gene promoters
share the 11-base pair M box containing a CATGTG motif, which was shown here to be bound in vitro by microphthalmia-associated
transcription factor (MITF). Transient cotransfection analysis showed
that MITF overexpression increased the expression of a reporter gene
under the control of the human tyrosinase or TRP-1 gene promoter but not the TRP-2 promoter. The promoter activation caused by MITF is
dependent on each CATGTG motif of the distal enhancer element, the M
box, and the initiator E box of the tyrosinase gene and the TRP-1 M
box. Furthermore, a truncated MITF lacking the carboxyl-terminal 125 amino acid residues transactivated the tyrosinase promoter less
efficiently than did MITF, suggesting that MITF's carboxyl terminus
contains a transcriptional activation domain, but unexpectedly such a
truncated MITF remarkably transactivated the TRP-2 gene promoter. These
results suggest that MITF is sufficient to direct pigment cell-specific
transcription of the tyrosinase and TRP-1 genes but not the TRP-2
gene.
Volume 272, Number 1,
Issue of January 3, 1997
pp. 503-509
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
,
,
,
Department of Applied Physiology and
Molecular Biology, Tohoku University School of Medicine, Aoba-ku,
Sendai, Miyagi 980-77 and the § Department of Dermatology,
Akita University School of Medicine, Akita 010, Japan
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