Na+-Dependent Active Transport Systems for Organic Solutes in an Alkalophilic Bacillus

Summary: Transport of nutrients (glutamate, glucose and acetate) into membrane vesicles of Bacillus sp. A-007 was specifically dependent on the Na+ gradient (outside high). The nutrients were co-transported with Na+, the process being stimulated by alkaline pH. In addition to the transport process, binding of glutamate to membrane vesicles was also pH- and Na+-dependent.