Molecular cloning and structure of the gene for 7 beta-(4-carboxybutanamido)cephalosporanic acid acylase from a Pseudomonas strain.

Abstract:

:A Pseudomonas strain produced an enzyme capable of deacylating 7 beta-(4-carboxybutanamido)cephalosporanic acid to 7-aminocephalosporanic acid in response to glutaric acid. The gene for the enzyme was cloned within the PstI site of pBR325 as a 7.35-kilobase-pair DNA segment from a mutant of this strain whose enzyme is produced constitutively. The gene expression in the primary clone appeared to be low in Escherichia coli but was significantly enhanced by reducing the size of the initial segment coupled with E. coli promoters. Subsequent subcloning resulted in localization of the gene to a 2.45-kilobase-pair fragment. Three clone-specific polypeptides with molecular weights of ca. 16,000, 54,000, and 70,000 were shown by maxicell analysis. The former two corresponded to the small and large subunits of the purified enzyme from the Pseudomonas strain, and the third polypeptide was suggested to be their precursor. This was supported by DNA sequence study together with amino acid sequencing of the amino terminus of both subunits: the sequences for the small and large subunits were localized contiguously in this order on the structural gene without termination codons between them. The nucleotide sequence also disclosed the presence of a signallike sequence preceding that for the small subunit, consistent with the previous observation that the enzyme might be periplasmic in the Pseudomonas strain. Those results suggest a process for the formation of an active enzyme complex from a precursor through two steps of processing.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Matsuda A,Komatsu KI

doi

10.1128/JB.163.3.1222-1228.1985

subject

Has Abstract

pub_date

1985-09-01 00:00:00

pages

1222-8

issue

3

eissn

0021-9193

issn

1098-5530

journal_volume

163

pub_type

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