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Cloning and sequence analysis of cDNA for bovine carboxypeptidase E | | L D Fricker
; C J Evans
; F S Esch
; E Herbert
; | | Date: |
2 Oct 1986 | | Journal: | Nature, 323 (6087), 461-4 | | Abstract: | Carboxypeptidase E (enkephalin convertase) was first identified as the carboxypeptidase B-like enzyme involved in the biosynthesis of enkephalin in bovine adrenal chromaffin granules. A similar enzyme is present in many brain regions and in purified secretory granules from rat pituitary and rat insulinoma. Within the secretory granules, carboxypeptidase E (CPE) activity is found in both a soluble and a membrane-bound form, which differ slightly in relative molecular mass (Mr). Here, to investigate whether the CPE activities in the various tissues are produced from a single gene, purified CPE was partially sequenced and oligonucleotide probes were used to isolate a clone encoding CPE from a bovine pituitary complementary DNA library. This cDNA hybridizes to bovine pituitary poly(A)+ RNAs of approximately 3.3, 2.6 and 2.1 kilobases (kb), with the 3.3-kb messenger RNA the predominant species. The predicted amino-acid sequence of the cDNA clone contains the partially determined sequences of CPE, several pairs of basic amino acids and displays some homology with both carboxypeptidases A and B. Restriction analysis of bovine genomic DNA suggests only one gene for CPE. This is consistent with a broad role for CPE in the biosynthesis of many neuropeptides. | | Source: | PubMed, pmid3020433 doi: 10.1038/323461a0 | | Services: | Forum | Review | Favorites | |
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