TEM-4, a New Plasmid-mediated Beta-lactamase That Hydrolyzes Broad-spectrum Cephalosporins in a Clinical Isolate of Escherichia Coli
Overview
Affiliations
A clinical isolate of Escherichia coli, strain CB-134, recovered in 1986 from an abdominal abscess, exhibited resistance to penams, oxyimino-beta-lactams including broad-spectrum cephalosporins (cefotaxime, ceftriaxone, ceftazidime), and aztreonam but remained susceptible to cephamycins (cefoxitin, cefotetan) and to moxalactam and imipenem. Clavulanate (2 micrograms/ml) restored the susceptibility of the strain to broad-spectrum cephalosporins and aztreonam. A beta-lactamase with an isoelectric point (pI) of 5.9 was detected in strain CB-134, and the corresponding gene was transferred by conjugation to E. coli together with the associated aminoglycoside resistance determinant [AAC(3)-II] and tetracycline, trimethoprim, and sulfonamide resistance. The beta-lactamase efficiently hydrolyzed cefotaxime and ceftriaxone but only moderately hydrolyzed ceftazidime and was inhibited by clavulanate and sulbactam (1 microM) and by anti-TEM-1 and anti-TEM-2 sera. This extended-spectrum beta-lactamase, conferring resistance to cefotaxime, ceftriaxone, ceftazidime, and aztreonam, was comparable to CTX-1 (TEM-3) but differed from it by pI. Agarose gel electrophoresis of the plasmid DNA indicated that this new enzyme was coded by pUD16, a plasmid of 220 kilobases which belongs to the Inc6 incompatibility group. Hybridization with an intragenic probe for TEM-1 revealed that this beta-lactamase derives from TEM-type beta-lactamases and hence it was named TEM-4.
Noone J, Helmersen K, Leegaard T, Skramm I, Aamot H Microorganisms. 2021; 9(1).
PMID: 33406597 PMC: 7823515. DOI: 10.3390/microorganisms9010097.
ESBL-producing and Its Rapid Rise among Healthy People.
Kawamura K, Nagano N, Suzuki M, Wachino J, Kimura K, Arakawa Y Food Saf (Tokyo). 2020; 5(4):122-150.
PMID: 32231938 PMC: 6989193. DOI: 10.14252/foodsafetyfscj.2017011.
Winkler M, Papp-Wallace K, Bonomo R J Antimicrob Chemother. 2015; 70(8):2279-86.
PMID: 25957381 PMC: 4500773. DOI: 10.1093/jac/dkv094.
Rodriguez I, Novais A, Lira F, Valverde A, Curiao T, Luis Martinez J Antimicrob Agents Chemother. 2015; 59(5):2904-8.
PMID: 25691645 PMC: 4394812. DOI: 10.1128/AAC.00296-15.
Quantifying nonspecific TEM beta-lactamase (blaTEM) genes in a wastewater stream.
Lachmayr K, Kerkhof L, DiRienzo A, Cavanaugh C, Ford T Appl Environ Microbiol. 2008; 75(1):203-11.
PMID: 18997031 PMC: 2612200. DOI: 10.1128/AEM.01254-08.