TABLE 1.

Drug transporter genes in E. coli being considered as l-cysteine exporter candidates

Drug transporter family	Gene	Known function (reference)
MF	bcr	Resistance to bicyclomycin, tetracycline, fosfomycin, sulfathiazole, etc. (3, 25, 37)
	emrAB	Resistance to deoxycholate, CCCP, etc. (20, 25)
	emrKY	Resistance to deoxycholate (25)
RND	cusA	Efflux of copper ion (14)
	acrD	Resistance to deoxycholate, SDS, novobiocin, etc. (25, 29)
	acrEF	Resistance to acriflavine, ethidium bromide, rhodamine 6G, deoxycholate, etc. (18, 25)
ABC	ybjYZ	Resistance to erythromycin (25)
	yojIH	Putative transporter