Table I.

E. coli Proteins Used in This Study

Target	Accession #	Functional category	MW (kDa)	# TM predicted	C-term localization	No. of amino acids	Family	TC #
ArsB	P0AB93	Arsenic efflux pump	45	11	out	429	ITa	2.A.45
DsdX	P08555	D-serine transporter	47	12	out	445	ITa	2.A.8.1.5
GntP	P0AC94	High-affinity gluconate transporter	47	10	out	447	ITa	2.A.8
GntU	P0AC96	Low-affinity gluconate transporter	46	11	out	446	ITa	2.A.8
LldP	P33231	L-lactate permease	59	12	out	551	ITa	2.A.14.1.1
Mtr	P0AAD2	Tryptophan permease	44	11	out	414	HAAAPb	2.A.42.1.2
SdaC	P0AAD6	Serine transporter	47	11	out	429	HAAAPb	2.A.42.2.1
TdcC	P0AAD8	Threonine/serine transporter	49	11	out	443	HAAAPb	2.A.42.2.2
TyrP	P0AAD4	Tyrosine permease	43	11	out	403	HAAAPb	2.A.42.1.1
ChaA	P31801	Calcium/proton antiporter	39	11	out	366	CaCAc	2.A.19.1.1
YrbG	P45394	Putative calcium/proton antiporter	35	9	out	325	CaCAc	2.A.19.5.1
LacY	P02920	Lactose permease	47	10	in	417	MFSd	2.A.1.5.1

^aIon Transporter Superfamily.

^bHydroxy/Aromatic Amino Acid Permease Family.

^cCa²⁺:Cation Antiporter Family.

^dMajor Facilitator Superfamily.