OHIO-1 beta-lactamase is part of the SHV-1 family. Antimicrob Agents Chemother 1990 Aug;34(8):1570-6
Date
08/01/1990Pubmed ID
2121093Pubmed Central ID
PMC171875DOI
10.1128/AAC.34.8.1570Scopus ID
2-s2.0-0025030319 (requires institutional sign-in at Scopus site) 24 CitationsAbstract
The OHIO-1 beta-lactamase gene was subcloned in a 1.16-kilobase TaqI fragment in the 2.4-kilobase chimeric plasmid pSK04. After directional subcloning into M13, the DNA sequence of this fragment was determined. The results showed an open reading frame of 858 base pairs (bp) encoding a protein of 286 amino acids. The structural gene showed 95, 87, and 60% DNA sequence identity with SHV-1, LEN-1, and TEM-1, respectively, and 93, 85, and 62% predicted amino acid sequence identity, respectively. The 87 bp upstream of the OHIO-1 structural gene had 96% identity with the upstream flanking sequence of SHV-1, including the -35 and -10 consensus sequences and the putative ribosomal binding site. A 223-bp DNA probe derived from a PstI-HaeII fragment in the C-terminal sequence of OHIO-1 had predicted 96, 88, and 61% sequence identity with SHV-1, LEN-1, and TEM-1, respectively. This probe hybridized to SHV-1 and poorly to LEN-1, but not to TEM-1 or a variety of other plasmid-mediated beta-lactamase genes, under stringent conditions. Screening of plasmid DNA derived from 40 ampicillin-resistant clinical isolates by Southern hybridization with the 223-bp probe uncovered no strains encoding OHIO-1. Isoelectric focusing of the same collection did identify two strains producing enzymes resembling SHV-1, however. We have also performed a kinetic comparison of OHIO-1, SHV-1, and TEM-1. OHIO-1 and SHV-1 were indistinguishable from each other but could be distinguished from TEM-1. These data clearly place OHIO-1 within the SHV-1 family of beta-lactamases.
Author List
Shlaes DM, Currie-McCumber C, Hull A, Behlau I, Kron MAuthor
Michael Kron MD Director, Professor in the Medicine department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Amino Acid SequenceBase Sequence
Cloning, Molecular
DNA Probes
Escherichia coli
Genes, Bacterial
Isoelectric Focusing
Kinetics
Molecular Sequence Data
Pseudomonas aeruginosa
beta-Lactamases