Table I. List of the identified protein. For GAPDH and RihC in table are reported the results obtained from spot 8 and 10 respectively. Number of peptides, Peptide sequences and Individual ion scores are reported in supplementary Table S1.

Spot	Protein	NCBI ID	MW (Da)	pI	Score	Seq. cov. (%)	Peptide sequence	Obs. mass	Theo. mass	Δm (ppm)
1	Phosphoketolase	gi 148544892	91346	5.09	2888	39	NQEUINLFVTSK	750,8326	750,8334	1,0655
2	Pyruvate kinase	gi 148543982	51793	5.06	4077	72	ELVUHVLNHGVLGS	869,4182	869,4185	0,3451
							UNELGKPVITATQMLDSMQENPRPTR	759,3545	759,3552	0,9218
3	Arginine deiminase	gi 148543680	46214	5.39	1803	73	UMoxSCPIVR	543,7015	543,7023	1,4714
							UMSCPIVR	535,7056	535,7049	−1,3067
							DQQAUIGDGITINHMTFK	699,6362	699,6373	1,5722
4	6-Phosphogluconate dehydrogenase	gi 184154309	53498	5.56	2005	56	AGUIIR	369,1643	369,1640	−0,8126
							AEEDGKPUVAYIGPNGAGHYVK	794,0203	794,0206	0,3778
5,7,8	Glyceraldehyde 3-phosphate dehydrogenase	gi 184153036	35971	5.41	2913	71	DDIIVSAGSUTTSCLAPMAK	1072,9598	1072,9589	−0,8388
							NDGVDFVLEUTGFYTSAEK	1100,4534	1100,4528	−0,5452
6	Ornithine carbamoyltransferase	gi 148543661	37536	5.21	1791	58	USFEVGAK	473,1824	473,1826	0,4227
							USFEVGAKDEGAHVTYLGPSGSHIGHK	963,4326	963,4337	1,1417
							ATENPNVLFEHULPAFHNLDTEVGK	725,8341	725,8334	−0,9644
9,10	Ribonucleoside hydrolase RihC	gi 148543341	32552	4.70	1211	60	VULDIDAEYFNK	767,8191	767,8200	1,1721