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Transposon Tn5 insertions causing anaerobic cysteine auxotrophy were isolated from a Salmonella typhimurium cysI parent (auxotrophic under aerobic but not anaerobic conditions). Insertions in one mutant group appeared to be in cysG. A second group of insertions, designated asr (anaerobic sulfite reduction), were located near map unit 53 on the S. typhimurium chromosome. They did not cause aerobic or anaerobic auxotrophy in a cys1+ background but did prevent dissimilatory sulfite reduction. Plasmids containing asr DNA cloned from wild-type S. typhimurium conferred anaerobic prototrophy and the ability to produce hydrogen sulfide from sulfite on an Escherichia coli cys1 mutant.

Identification and cloning of genes involved in anaerobic sulfite reduction by Salmonella typhimurium