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. 1982 Sep;151(3):1109–1117. doi: 10.1128/jb.151.3.1109-1117.1982

Cytoplasmic steps of peptidoglycan synthesis in Escherichia coli.

D Mengin-Lecreulx, B Flouret, J van Heijenoort
PMCID: PMC220385  PMID: 6125497

Abstract

The cellular pool levels of most of the cytoplasmic precursors of peptidoglycan synthesis were determined for normally growing cells of Escherichia coli K-12. In particular, a convenient method for analyzing the uridine nucleotide precursor contents was developed by associating gel filtration and reverse-phase high-pressure liquid chromatography techniques. The enzymatic parameters of the four synthetases which catalyze the stepwise addition of L-alanine, D-glutamic acid, meso-diaminopimelic acid, and D-alanyl-D-alanine to uridine diphosphate-N-acetylmuramic acid were determined. It was noteworthy that the pool levels of L-alanine, D-glutamic acid, meso-diaminopimelic acid, and D-alanyl-D-alanine were much higher than the Km values determined for these substrates, whereas the molar concentrations of the uridine nucleotide precursors were lower than or about the same order of magnitude as the corresponding Km values. Taking into consideration the data obtained, an attempt was made to compare the in vitro activities of the D-glutamic acid, meso-diaminopimelic acid, and D-alanyl-D-alanine adding enzymes with their in vivo functioning, expressed by the amounts of peptidoglycan synthesized. The results also suggested that these adding activities were not in excess in the cell under normal growth conditions, but their amounts appeared adjusted to the requirements of peptidoglycan synthesis. Under the different in vitro conditions considered, only low levels of L-alanine adding activity were observed.

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Selected References

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