TABLE 1.

Comparison of core subunits of RNA polymerase and annotated sigma factors^a

Subunit name	Species	Global alignment score	CLUSTAL W alignment score	% Identity
				E. coli		M. smegmatis
				SIMb	LALIGNc	SIMb	LALIGNc
α	M. tuberculosis	2,035	1,916			90.9	90.9
β		7,943	6,663			91.7	91.4
β′		7,943	7,463			91.4	91.4
ω		539	485			83.0	79.1
σA		1,697	2,217	60.3	32.8	79.8	76.7
σB		1,475	1,790	43.7	33.7	93.7	92.3
σF		972	1,237	29.7	27.8	83.8	80.4
σH		202	391	27.5	14.1	38.8	32.6

^aσ^J, σ^L, σ^M, σ^C, σ^D, σ^K, σ^I, σ^G, and σ^E were found to be putative in the mc²155 genome; hence, sequence homology couldnot be performed.

^bhttp://www.expasy.ch/tools/sim-prot.html.

^chttp://www.ch.embnet.org/software/LALIGN_form.html.