Cloning, expression, and chromosomal localization of the mouse meprin β subunit

C. M. Gorbea, P. Marchand, W. Jiang, N. G. Copeland, D. J. Gilbert, N. A. Jenkins, J. S. Bond

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

Meprins are plasma membrane homo- or hetero-oligomeric metalloendopeptidases that contain glycosylated α and/or β subunits. This paper reports the cloning and sequencing of the mouse kidney β subunit. The primary translation product is composed of 704 amino acids which includes a transient signal sequence of 20 amino acids at the NH2 terminus. The protease domain (Asn-63 to Leu-260) contains the putative zinc-binding motif characteristic of metalloendopeptidases of the "astacin family." The COOH terminus contains an epidermal growth factor-like domain, a potential membrane-spanning domain, and an additional 26 amino acids. The β subunit has an overall 42% identity to the α subunit, however, a 56-amino acid segment near the COOH terminus of α is missing in β, and the putative transmembrane and cytoplasmic domains of the subunits share no significant sequence similarity. NH2-terminal analyses of detergent-solubilized mature forms revealed that, unlike α, the prosequence (Leu-21 to Lys-62) is not removed from the β subunit. Northern blot analysis revealed a 2.5-kilobase message for the β subunit in the kidney and intestine of C57BL/6 and C3H/He mice. The gene for the β subunit was localized to mouse chromosome 18. These studies indicate that α and β probably derived from a common ancestral gene, but have evolved so that their genes are on two different chromosomes, and their tissue-specific expression and post-translational processing differ.

Original languageEnglish (US)
Pages (from-to)21035-21043
Number of pages9
JournalJournal of Biological Chemistry
Volume268
Issue number28
StatePublished - 1993

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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