Molecular cloning and nucleotide sequence of cDNA of microsomal carboxyesterase E1 of rat liver

Yasumitsu Takagi, Ken Ichirou Morohashi, Shun Ichiro Kawabata, Mitiko Go, Tsuneo Omura

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

cDNA clones of the mRNA for rat liver carboxyesterase E1, one of the carboxyesterases exclusively located on the luminal side of microsomal vesicles, were isolated. Sequence analysis of 2 kbp long cDNA revealed the primary structure of carboxyesterase E1, which consisted of 549 amino acids (Mr 60,171.71) and contained an extra peptide of 18 amino acids at the NH2-terminus of the mature enzyme. Comparison of the deduced primary structure and sequences of some proteolytic fragments of the purified enzyme indicated the multiplicity of the enzyme. The extra peptide at the NH2-terminal had features in common with the signal peptides of most secretory proteins. However, no polar amino acid residues existed before the hydrophobic core of the signal peptide. A new interpretation is proposed to explain how the signal peptide without the NH2 polar residues works. A tetrapeptide (KDEL) which was shown to keep a few microsomal proteins in the lumen of the endoplasmic reticulum was not found in the primary structure of carboxyesterase E1, which suggested the existence of another mechanism for retention of proteins in the lumen of endoplasmic reticulum. Carboxyesterase E1 showed significant homology with the COOH-terminal portion of thyroglobulin.

Original languageEnglish
Pages (from-to)801-806
Number of pages6
JournalJournal of biochemistry
Volume104
Issue number5
DOIs
Publication statusPublished - Nov 1988

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology

Fingerprint Dive into the research topics of 'Molecular cloning and nucleotide sequence of cDNA of microsomal carboxyesterase E1 of rat liver'. Together they form a unique fingerprint.

  • Cite this