TABLE 2.

NanoESI-QTOF MS analysis of the S-layer glycopeptide ATLTSADVIRVD of G. stearothermophilus NRS 2004/3a^a

RUb	Mass
	M theorc	M exptl
13	7,428.44	NDd
13 + Rha	7,574.59	ND
14	7,866.87	7,866.25
14 + Rha	8,013.01	8,013.41
15	8,305.30	8,305.05
15 + Rha	8,451.44	8,450.85
16	8,743.73	8,743.57
16 + Rha	8,889.87	8,890.21
17	9,182.16	9,181.53
17 + Rha	9,328.30	ND

^aData show the theoretical (Theor) and experimentally determined (Exptl) average molecular masses.

^bRU designates the number of trisaccharide repeating units, with the terminal rhamnose of the repeating unit at the nonreducing end being O-methylated. The core structure consists of two rhamnoses and one galactose. An additional rhamnose in the core is indicated by “+ Rha.”

^cTheoretical molecular masses were calculated using average masses.

^dND, not determined.