Different binding sites for entry and exit of amino acids in whole cells of Mycobacterium phlei

Abstract

Mutual inhibition of uptake with different amino acids in whole cells of M. phlei showed that the binding site of proline was different from those of all other amino acids studied. Other groups of amino acids share a common binding site: lysine, histidine and arginine; valine, leucine and isolecuine; tryptophan, tyrosine and phenylalanine; glutamic acid and aspartic acid. The exit and entry processes were studied for proline, glutamine and glutamic acid. In each case the entry and exit processes were mediated by different membrane sites.