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J Bacteriol. 1994 October; 176(20): 6188-6191

research-article

Identification and sequence analysis of the soxB gene essential for sulfur oxidation of Paracoccus denitrificans GB17.

Lehrstuhl für Technische Mikrobiologie, Fachbereich Chemietechnik, Universität Dortmund, Germany.

ABSTRACT

The coding region for lithotrophic sulfur oxidation (Sox) in Paracoccus denitrificans GB17 was identified by isolation of a transposon Tn5-mob mutant with a Sox- phenotype (strain TP19). The corresponding wild-type region was cloned previously (G. Mittenhuber, K. Sonomoto, M. Egert, and C. G. Friedrich, J. Bacteriol. 173:7340-7344, 1991). Sequence analysis of a 2.5-kb subclone that complemented strain TP19 revealed that Tn5-mob was inserted into a coding region for a 553-amino-acid polypeptide named SoxB. This polypeptide had an M(r) of 60.573, including a possible signal peptide. The function of the SoxB protein of P. denitrificans GB17 appeared to be identical to that of enzyme B of the thiosulfate-oxidizing enzyme system of Thiobacillus versutus. The amino acid compositions of the two proteins were identical, and the amino acid sequences of three internal peptides of enzyme B as determined by Edman degradation were identical to corresponding sequences of the deduced SoxB protein of P. denitrificans GB17.

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