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

Toru Togawa, Ken ichi Shofuda, Toshinobu Yaginuma, Shiro Tomino, Hiroshi Nakato, Susumu Izumi

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

BMCP182 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.

Original languageEnglish (US)
Pages (from-to)611-620
Number of pages10
JournalInsect Biochemistry and Molecular Biology
Volume31
Issue number6-7
DOIs
StatePublished - Apr 27 2001
Externally publishedYes

Keywords

  • Bm1 element
  • Bmsvp
  • Bombyx mori
  • Cuticle protein
  • Gene cloning
  • Transcription factor
  • Transcription initiation site

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