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Characterization of the complete genomic structure of human thromboxane synthase gene and functional analysis of its promoter.

Abstract：

:Thromboxane A2 (TXA) is a potent vasoconstrictor and mediator of platelet aggregation. Thromboxane synthase (TXAS), which catalyzes the biosynthesis of TXA, is a member of the cytochrome P450 superfamily. We report here the complete genomic structure of the human TXAS gene. The gene contains 13 exons and is 193 kb long, the largest P450 gene ever isolated. The physical localization of the TXAS gene on the genetic map of human chromosome 7 was established. A major transcription start site is located at a motif similar to the initiator element where the transcription factor TFII-I binds. We have sequenced up to 1.6 kb of the 5'-flanking region of the TXAS gene and characterized the promoter activity in a human megakaryocyte cell line and endothelial cells. Our results demonstrated that the nucleotides -248/+137 relative to the major transcription start site conferred a full promoter activity of the TXAS gene. This region was regulated negatively by cis-elements located between -1562 and -248. Moreover, the regions outside -1562/+137 might control tissue-specific TXAS expression.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Tazawa R,Green ED,Ohashi K,Wu KK,Wang LH

doi

10.1006/abbi.1996.0464

subject

Has Abstract

pub_date

1996-10-15 00:00:00

pages

349-56

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(96)90464-6

journal_volume

334

pub_type

杂志文章

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