Table 2. Changes of differentially expressed proteins of E. coli TG1 following exposure to cadmium.

Protein	Up(+)/Down(−) regulation (fold)
	TG1 carrying pUC19 plasmid	TG1 expressing GFP	TG1 expressing His6GFP	TG1expressing OmpA	TG1 expressing His-OmpA
Energy metabolism
Glycolysis
Glyceraldehyde-3-phosphate dehydrogenase (1)	−2.02	−1.84	Absence	+2.69	Absence
Glyceraldehyde-3-phosphate dehydrogenase (2)	+1.75	+1.65	−1.06	−2.29	+1.63
Tricarboxylic acid cycle
Aconitase	−1.20	No change	Absence	No change	Absence
Glycerol uptake and lipolysis
Glycerol kinase	−1.60	+1.73	+1.92	+1.43	+1.33
Protein biosynthesis machinery
Translation elongation factor-Ts	+2.12	+1.84	+1.35	−0.39	+1.37
Transporters
Oligopeptide-binding protein	−1.65	+1.37	−1.34	+1.22	+1.21
Amino acid ABC transporter substrate-binding protein	−1.42	+1.37	+1.29	Not detectable	+1.24
H+-transporting ATPase	+2.69	−1.09	+1.30	−2.64	No change
ATP synthase F1, beta subunit	+1.32	+1.26	+1.08	+1.86	−1.44
Stress defense mechanism
MnSOD	+2.20	+1.29	−1.65	Not detectable	+2.08
Alkyl hydroperoxide reductase	−1.15	+1.71	−1.10	+1.52	−1.01
DNA starvation/stationary phase protection protein; Dps	−3.29	Low amount	−1.35	Low amount	−1.05
Others
Ribosomal protein L9	+2.08	+1.33	−1.29	+1.42	+1.57
GFP	Not detectable	−1.45	Not detectable	Not detectable	Not detectable
His6GFP	Not detectable	Not detectable	−2.24	Not detectable	Not detectable
Disulfide isomerase I	−1.71	Not determined	−1.85	Not determined	−1.36
OmpA (1)	−1.68	−1.26	−1.40	−1.35	Absence
OmpC precursor	−1.15	−1.31	−1.56	+1.32	+2.11
OmpF	−1.18	Absence	Absence	No change	Absence