TABLE 2.

Molecular masses obtained by MALDI-TOF mass spectrometry of tryptic digests of bands CotC, CotU, and CotC-CotU^b

Peptide	Sequence positionsa	Theoretical Mr (M+H)+	Experimental Mr (M+H)+ of band:
			CotC	CotU	CotC-CotC	CotC-CotU
1	40-54	1,869.83		1,869.78		1,869.78
2	45-66	2,964.42	2,964.43		2,964.46	2,964.46
3	68-86	2,539.04		2,539.01		2,538.91

^aRefers to the amino acid sequence of CotC (peptide 2) and CotU (peptides 1 and 3) as reported in Fig. 3C.

^bTheoretical and experimental masses together with peptide sequence positions are reported (Da).