ZitB (YbgR), a Member of the Cation Diffusion Facilitator Family, Is an Additional Zinc Transporter in Escherichia coli

Abstract
The Escherichia coli zitB gene encodes a Zn(II) transporter belonging to the cation diffusion facilitator family. ZitB is specifically induced by zinc. ZitB expression on a plasmid rendered zntA -disrupted E. coli cells more resistant to zinc, and the cells exhibited reduced accumulation of 65 Zn, suggesting ZitB-mediated efflux of zinc.