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. 1999 Apr;43(4):969-71.
doi: 10.1128/AAC.43.4.969.

Sequences of the genes for the TEM-20, TEM-21, TEM-22, and TEM-29 extended-spectrum beta-lactamases

G Arlet  1 , S Goussard, P Courvalin, A Philippon
Affiliations

Sequences of the genes for the TEM-20, TEM-21, TEM-22, and TEM-29 extended-spectrum beta-lactamases

G Arlet et al. Antimicrob Agents Chemother. 1999 Apr.

Abstract

The sequences of the blaTEM genes encoding TEM-20, TEM-21, TEM-22, and TEM-29 extended-spectrum beta-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.

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Figures

FIG. 1
FIG. 1
Promoter sequence of the blaTEM-20 and blaTEM-22 genes. The differences in the promoter region of Tn2 are shown in bold and numbered according to Sutcliffe (26). The −35 and −10 regions of Pa, Pb, and P3 are boxed. The start codon is underlined. Deleted nucleotides are indicated by dashes.
See this image and copyright information in PMC

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