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Structural analysis of gene encoding cuticle protein BMCP18, and characterization of its putative transcription factor in the silkworm, Bombyx mori.

Abstract：

:BMCP18(2) is one of the major cuticle proteins identified in the larval cuticle of the silkworm, Bombyx mori. A genomic clone coding for BMCP18 was isolated from a B. mori genomic library, and its structure was analyzed. The BMCP18 gene consists of three exons interspersed by two introns. Bm1 element-like sequences were identified around this gene, suggesting possible involvement of this retroposon in the duplication of B. mori cuticle protein genes during evolution. A structural comparison of the BMCP18 gene and related cuticle protein genes of other lepidopteran species (MSCP14.6 and HCCP12) showed that the 5' upstream region of the BMCP18, MSCP14.6, and HCCP12 genes has a 12-bp identical sequence matching the recognition sequence for transcription factors COUP-TF and HNF-4. This implies that molecular mechanisms regulating expression of these cuticle protein genes are also conserved. mRNAs coding for Bmsvp, the B. mori homolog of Drosophila Seven-up, which is known as a homolog of vertebrate COUP-TF, and BmHNF-4, a homolog of vertebrate HNF-4, were detected in the larval epidermis. Bmsvp bound to the 12-bp sequence in vitro, suggesting that Bmsvp regulates the BMCP18 gene expression.

journal_name

Insect Biochem Mol Biol

journal_title

Insect biochemistry and molecular biology

authors

Togawa T,Shofuda K,Yaginuma T,Tomino S,Nakato H,Izumi S

doi

10.1016/s0965-1748(00)00166-1

subject

Has Abstract

pub_date

2001-04-27 00:00:00

pages

611-20

issue

6-7

eissn

0965-1748

issn

1879-0240

pii

S0965174800001661

journal_volume

31

pub_type

杂志文章

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