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Protein Science, Vol 1, Issue 12 1642-1651, Copyright © 1992 by Cold Spring Harbor Laboratory Press

ARTICLE

Functional mapping of the surface of Escherichia coli ribose-binding protein: Mutations that affect chemotaxis and transport

R. A. BINNIE, H. ZHANG, S. MOWBRAY and M. A. HERMODSON
Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907-1153

Ribose-binding protein is a bifunctional soluble receptor found in the periplasm of Escherichia coli. Interaction of liganded binding protein with the ribose high affinity transport complex results in the transfer of ribose across the cytoplasmic membrane. Alternatively, interaction of liganded binding protein with a chemotactic signal transducer, Trg, initiates taxis toward ribose. We have generated a functional map of the surface of ribose-binding protein by creating and analyzing directed mutations of exposed residues. Residues in an area on the cleft side of the molecule including both domains have effects on transport. A portion of the area involved in transport is also essential to chemotactic function. On the opposite face of the protein, mutations in residues near the hinge are shown to affect chemotaxis specifically.
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