FIG. 7.

Proposed aerobic respiratory pathways in M. smegmatis and related organisms. The pathways in B. subtilis were adapted from references 41 and 64. The M. tuberculosis pathways were deduced from its genome sequence (7), and those of M. smegmatis are based on this study and analysis of the preliminary genome sequence data obtained from The Institute for Genomic Research website (http://www.tigr.org). Solid arrows denote confirmed pathways, and dashed arrows denote putative pathways. The mycobacterial cytochrome reductase complex (QcrCAB) is denoted as “bcc” in accordance with the designation of QcrC as cytochrome cc (54).