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Okazaki, Tuneko (Washington University School of Medicine, St. Louis, Mo.),Jack L. Stominger, and Reiji Okazaki . Thymidine diphosphate-l -rhamnose metabolism in smooth and rough strains ofEscherichia coli andSalmonella weslaco . J. Bacteriol.86: 118–124. 1963.—Logarithmic-phase cells ofEscherichia coli O18, which have rhamnose in their lipopolysaccharide, contained only traces of thymidine diphosphate (TDP)-l -rhamnose. Extracts of this organism, however, catalyzed the synthesis of TDP-l -rhamnose from TDP-d -glucose. On the other hand, cells ofE. coli R44, a rough variant of this strain which contains no rhamnose in its lipopolysaccharide, contained a large amount of TDP-l -rhamnose. Like the smooth form, this organism was able to synthesize TDP-l -rhamnose. The rough variant is apparently a mutant blocked in some manner in utilization of TDP-l -rhamnose for lipopolysaccharide synthesis. Similar studies of smooth (rhamnose-containing) and rough (rhamnose-lacking) forms ofSalmonella weslaco showed that both organisms can synthesize TDP-l -rhamnose from TDP-d -glucose. In contrast to the smooth and rough forms ofE. coli O18, only traces of TDP-l -rhamnose were detected in extracts of both forms. A second thymidine diphosphosugar compound isolated fromE. coli R44 is similar or identical to TDP-X, previously isolated fromE. coli Y-10.

THYMIDINE DIPHOSPHATE- l -RHAMNOSE METABOLISM IN SMOOTH AND ROUGH STRAINS OF ESCHERICHIA COLI AND SALMONELLA WESLACO