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. 1970 Jul;103(1):89–96. doi: 10.1128/jb.103.1.89-96.1970

Control of Colanic Acid Synthesis

W D Grant a,1, I W Sutherland a, J F Wilkinson a
PMCID: PMC248042  PMID: 4912533

Abstract

The nucleotide pools of certain mucoid, colanic acid-synthesizing strains of Escherichia coli, Salmonella typhimurium, and Aerobacter cloacae were examined, and in all cases the nucleotide sugars uridine-5′-diphosphate glucose (UDPG), uridine-5′-diphosphate galactose (UDPGal), guanosine-5′-diphosphate fucose (GDPF), and uridine-5′-diphosphate glucuronic acid (UDPGA) were detected. It is postulated that these nucleotide sugars are precursors in the synthesis of colanic acid. The levels of these nucleotide sugars and of the enzymes involved in their synthesis were examined in a number of mucoid strains and compared with the levels found in certain strains which were repressed in the synthesis of colanic acid, only becoming mucoid when grown in the presence of p-fluorophenylalanine (PFA). The levels of UDPG and UDPGal and the enzymes involved in their synthesis were substantially the same in both mucoid and repressed types, but the levels of UDPGA and GDPF and of some of the enzymes involved in their synthesis were much higher in mucoid strains. When repressed strains were grown in the presence of PFA, the levels of UDPGA and GDPF approached those found in mucoid strains. The existence of an operon, containing genes coding for certain key enzymes involved in colanic acid synthesis has been suggested.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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