1DBP

IDENTICAL MUTATIONS AT CORRESPONDING POSITIONS IN TWO HOMOLOGOUS PROTEINS WITH NON-IDENTICAL EFFECTS

Summary for 1DBP

• Entry DOI: 10.2210/pdb1dbp/pdb
• Descriptor: D-RIBOSE-BINDING PROTEIN, beta-D-ribopyranose (3 entities in total)
• Functional Keywords: binding protein
• Biological source: Escherichia coli
• Cellular location: Periplasm : P02925
• Total number of polymer chains: 1
• Total formula weight: 28715.59

Authors

Mowbray, S.L.,Joakim Bjorkman, A.J. (deposition date: 1994-01-31, release date: 1994-05-31, Last modification date: 2024-02-07)

Primary citation

Bjorkman, A.J.,Binnie, R.A.,Cole, L.B.,Zhang, H.,Hermodson, M.A.,Mowbray, S.L.
Identical mutations at corresponding positions in two homologous proteins with nonidentical effects.
J.Biol.Chem., 269:11196-11200, 1994

PubMed Abstract: The x-ray structure of a mutant (Gly72 to Asp) of the Escherichia coli ribose-binding protein with altered transport function has been solved and refined to 2.2-A resolution with a conventional R-factor (R-factor = [formula: see text]) of 16.0% and good stereochemistry. Comparison with the wild type ribose-binding protein shows that the structure is disturbed little at the actual mutation site, but quite appreciably in a neighboring loop. Changes in the surface of the protein at the site of mutation, however, seem to explain the functional effects. A corresponding mutation of the related glucose/galactose-binding protein has different structural and functional effects due to the different structural context of the mutation site in that protein. These results are consistent with the concept that these proteins have slightly different ways of interacting with the membrane components in transport and chemotaxis.

PubMed: 8157648

Experimental method

X-RAY DIFFRACTION (2.2 Å)