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. 1985 Jul;163(1):305-10.
doi: 10.1128/jb.163.1.305-310.1985.

Recycling of murein by Escherichia coli

E W Goodell

Recycling of murein by Escherichia coli

E W Goodell. J Bacteriol. 1985 Jul.

Abstract

The tripeptide (L-Ala-D-Glu-meso-diaminopimelic acid [A2pm]), tetrapeptide (L-Ala-D-Glu-A2pm-D-Ala), and dipeptide (A2pm-D-Ala) which are shed by Escherichia coli from the murein sacculus were found to be reused by the cells to synthesize murein. The tripeptide was used directly, without degradation, to form UDP-N-acetylmuramyl-L-Ala-D-Glu-A2pm. The tetrapeptide lost its carboxy-terminal D-Ala, apparently in the periplasm, before being used. The dipeptide was degraded to D-Ala and A2pm before uptake.

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