Molecular cloning and characterization of the translationally controlled tumor protein gene in Bombyx mori

Jae Man Lee, Takahiro Kusakabe, Yutaka Kawaguchi, Yoshitaka Miyagawa, Masateru Takahashi, Hiroaki Mon, Si Kab Nho, Katsumi Koga

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Translationally controlled tumor protein (Tctp/p23) is known to be synthesized preferentially in cells during the early growth phase of tumors, but is also expressed in normal cells. To elucidate its molecular basis of the expression and physiological significance, a cDNA encoding for the Bombyx mori Tctp (BmTctp) was deduced by editing the partial cDNA sequences registered in a Bombyx EST database. RT-PCR analyses indicated that the BmTCTP mRNA was transcribed in all larval organs examined and was present constantly during the cell cycle of BmN4 cells. A genomic clone of 4255 nucloetide residues produced by inverse PCR contained the 5′-flanking region, two introns and three exons of the BmTCTP gene. Sequence analysis of the 5′-flanking region indicated that a putative promoter region contains several canonical transcription elements such as GATA box, CCAAT motif, MEF2, E4BP4.01 and AP-1, but lacks a TATA box element. Luciferase reporter assay of the deletion constructs of the 5′-flanking region revealed that the -676 to +66 region enhanced the promoter activity the most markedly. In addition to this, there were at least two enhancer-like elements and several repressor elements.

Original languageEnglish (US)
Pages (from-to)35-43
Number of pages9
JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
Volume139
Issue number1
DOIs
StatePublished - Sep 1 2004

Keywords

  • 5′-flanking region
  • BmN4 cells
  • BmTCTP gene
  • Bombyx EST database
  • Bombyx mori
  • Inverse PCR
  • Luciferase reporter assay
  • Transcription elements

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology

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