Sequencing and expression of aadA, bla, and tnpR from the multiresistance transposon Tn1331 - PubMed (original) (raw)

Comparative Study

Sequencing and expression of aadA, bla, and tnpR from the multiresistance transposon Tn1331

M E Tolmasky. Plasmid. 1990 Nov.

Abstract

A fragment of Tn1331 including tnpR, aac, aadA, and a bla gene which encodes lower levels of resistance to ampicillin and carbenicillin as compared to those mediated by the TEM beta-lactamase was sequenced. The polypeptide encoded by the bla gene has homology with the OXA-1, PSE-2, and OXA-2 proteins. Genes aac and bla are upstream and downstream respectively of aadA, and are both flanked by recombinational hot spots. Tn1331 has 520-bp direct repeats which include parts of the tnpR and TEM bla genes. Evolutionary models for the genesis of Tn1331 are proposed.

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