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. 1988 May;170(5):2185–2191. doi: 10.1128/jb.170.5.2185-2191.1988

Analysis of lipopolysaccharide biosynthesis in Salmonella typhimurium and Escherichia coli by using agents which specifically block incorporation of 3-deoxy-D-manno-octulosonate.

R C Goldman 1, C C Doran 1, J O Capobianco 1
PMCID: PMC211104  PMID: 2834331

Abstract

Antibacterial agents which specifically inhibit CTP:CMP-3-deoxy-D-manno-octulosonate cytidylyltransferase activity were used to block the incorporation of 3-deoxy-D-manno-octulosonate (KDO) into lipopolysaccharide. Lipopolysaccharide synthesis ceased, molecules similar in structure to lipid A accumulated, and bacterial growth ceased following addition of such agents to cultures of Salmonella typhimurium and Escherichia coli. Although four major species of lipid A accumulated in S. typhimurium, their kinetics of accumulation were different. The least polar of the major species was IVA [O-(2-amino-2-deoxy-beta-D-glucopyranosyl)-(1----6)-2-amino-2-deoxy-a lph a- D-glucose, acylated at positions 2, 3, 2', and 3' with beta-hydroxymyristoyl groups and bearing phosphates at positions 1 and 4'], a molecule previously isolated from bacteria containing a kdsA mutation (C. R. H. Raetz, S. Purcell, M. V. Meyer, N. Qureshi, and K. Takayama, J. Biol. Chem. 260:16080-16088, 1985). Species IVA accumulated first and to the greatest extent following addition of the inhibitor, with other more polar derivatives appearing only after IVA attained half its maximal level. In contrast, only two major species of precursor accumulated in E. coli following addition of the inhibitor. One of these species was identical to IVA from S. typhimurium on the basis of chemical composition, fast atom bombardment mass spectroscopy, and comigration on Silica Gel H, and it also accumulated prior to a more polar species of related structure. We conclude that the addition of KDO to precursor species IVA is the major pathway of lipid A-KDO formation in both S. typhimurium LT2 and E. coli and that accumulation of the more polar species lacking KDO only occurs in response to accumulation of species IVA following inhibition of the normal pathway.

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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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