Note: Sequences of the Genes for the TEM-20 TEM-21 TEM-22 and TEM-29 Extended-Spectrum β-Lactamases

摘要

The sequences of the blaTEM genes encoding TEM-20, TEM-21, TEM-22, and TEM-29 extended-spectrum β-lactamases were determined. Analysis of the deduced amino acid sequences indicated that TEM-20 and TEM-29 were derived from TEM-1 and that TEM-21 and TEM-22 were derived from TEM-2. The substitutions involved were Ser-238 and Thr-182 for TEM-20; His-164 for TEM-29; Lys-104, Arg-153, and Ser-238 for TEM-21; and Lys-104, Gly-237, and Ser-238 for TEM-22. The promoter region of the blaTEM-22 gene was identical to that of blaTEM-3. High-level production of TEM-20 could result from a 135-bp deletion which combined the −35 region of the Pa promoter with the −10 region of the P3 promoter and a G→T transition in the latter motif.