Terminal oxidases of Bacillus subtilis strain 168: one quinol oxidase, cytochrome aa(3) or cytochrome bd, is required for aerobic growth.
The gram-positive endospore-forming bacterium Bacillus subtilis has, under aerobic conditions, a branched respiratory system comprising one quinol oxidase branch and one cytochrome oxidase branch. The system terminates in one of four alternative terminal oxidases. Cytochrome caa(3) is a cytochrome c oxidase, whereas cytochrome bd and cytochrome aa(3) are quinol oxidases. A fourth terminal oxidase, YthAB, is a putative quinol oxidase predicted from DNA sequence analysis. None of the terminal oxidases are, by themselves, essential for growth. However, one quinol oxidase (cytochrome aa(3) or cytochrome bd) is required for aerobic growth of B. subtilis strain 168. Data indicating that cytochrome aa(3) is the major oxidase used by exponentially growing cells in minimal and rich medium are presented. We show that one of the two heme-copper oxidases, cytochrome caa(3) or cytochrome aa(3), is required for efficient sporulation of B. subtilis strain 168 and that deletion of YthAB in a strain lacking cytochrome aa(3) makes the strain sporulation deficient.
Winstedt
L
L
Department of Microbiology, Lund University, Lund, Sweden.
von Wachenfeldt
C
C
D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000502:physiology; D000332:Aerobiosis; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D003573:Cytochrome b Group; D003580:Cytochromes / Q000235:genetics / Q000378:metabolism*; D045222:Electron Transport Chain Complex Proteins; D003576:Electron Transport Complex IV / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D007544:Isopropyl Thiogalactoside / Q000494:pharmacology; D016296:Mutagenesis; D009876:Operon; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000187:drug effects; D013171:Spores, Bacterial / Q000502:physiology
D018528:ATP-Binding Cassette Transporters; C089838:CydC protein, E coli; C089839:CydD protein, E coli; D003573:Cytochrome b Group; D003580:Cytochromes; D045222:Electron Transport Chain Complex Proteins; D029968:Escherichia coli Proteins; D007544:Isopropyl Thiogalactoside; D010088:Oxidoreductases; C020094:duroquinol oxidase; C040077:cytochrome bd terminal oxidase complex, E coli; D003576:Electron Transport Complex IV