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Appl. Environ. Microbiol., Mar 1997, 1139-1142, Vol 63, No. 3
Copyright © 1997, American Society for Microbiology

Characterization of an insertion sequence, IS12528, from Gluconobacter suboxydans

K Kondo and S Horinouchi
Department of Biotechnology, Graduate School of Agriculture and Life Sciences, University of Tokyo, Japan.

A novel insertion sequence element, IS12528, was found to be associated with inactivation of the alcohol dehydrogenase by insertion in the adhA gene, which encodes the primary dehydrogenase subunit of the three- component membrane-bound alcohol dehydrogenase complex in Gluconobacter suboxydans. Cloning and sequencing analyses revealed that IS12528 was 905 bp in length and had a terminal inverted repeat of 18 bp. In addition, IS12528 was found to generate a 3-bp duplication (TMA, where M represents C or A) at the inserted site upon transposition. IS12528 encoded one long product of 274 amino acids that was rich in basic amino acids. This protein showed significant homology with putative transposases of the IS1031 family isolated from Acetobacter xylinum, which belongs to another genus of acetic acid bacteria. IS12528-like sequences were distributed in a wide variety of acetic acid bacteria, as determined by Southern hybridization and PCR. These observations suggest that IS12528 is one of the insertion sequences that are responsible for genetic instability leading to deficiencies in various physiological properties in a variety of acetic acid bacteria.

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