TABLE 1.

SMR family members identified in B. subtilis and  E. coli^a

Abbreviation	Description in database	Organism	No. of residues	Database and accession no.	NCBI (gi) no.
YkkC Bsu	Hypothetical protein	B. subtilis	112	spP49856	2632029
YkkD Bsu	Hypothetical protein	B. subtilis	105	gbAJ002571	2632030
EbrA Bsu	MDR protein	B. subtilis	105	gbZ99113	2634114
EbrB Bsu	MDR protein	B. subtilis	117	gbZ99113	2634113
YvdR Bsu	Hypothetical protein	B. subtilis	106	gbZ94043	1945677
YvdS Bsu	Hypothetical protein	B. subtilis	114	gbZ94043	1945678
YvaE Bsu	Similar to multidrug-efflux transporter	B. subtilis	119	gbZ99121	2635870
Ebr Eco	Putative ethidium bromide resistance protein; plasmid encoded	E. coli	115	spP14502	119115
SugE Eco	SugE protein	E. coli	105	spP30743	3915875
b1599 Eco	Putative ethidium bromide resistance protein	E. coli	109	gbD90802	1742633
b1600 Eco	Putative ethidium bromide resistance protein	E. coli	121	gbD90802	1742634
EmrE Eco	Ethidium bromide-methyl viologen resistance protein	E. coli	110	spP23895	127565

^aThis table lists SMR family homologues identified in the completely sequenced genomes of B. subtilis and E. coli. Homologues in archaea and eukaryotes, as well as numerous bacteria, have also been identified (D. L. Jack and M. H. Saier, Jr., unpublished results).