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J Bacteriol. 1991 August; 173(15): 4751-4756

research-article

Autoradiographic analysis of diaminopimelic acid incorporation in filamentous cells of Escherichia coli: repression of peptidoglycan synthesis around the nucleoid.

E Mulder and C L Woldringh

Department of Molecular Cell Biology, University of Amsterdam, The Netherlands.

ABSTRACT

Peptidoglycan synthesis rate in nonconstricting filaments of Escherichia coli dnaX(Ts) has been studied by autoradiography of incorporated [3H]diaminopimelic acid. Analysis of autoradiograms of whole cells and sacculi showed that peptidoglycan is synthesized at a reduced rate in the nucleoid-containing parts of these filaments. The lower rate of peptidoglycan synthesis in the cell center coincides with a higher local rate of protein synthesis. DNA-less cell formation in dnaX(Ts), dnaX(Ts) sfiA, and the minB minicell-forming mutant is accompanied by a local increase in peptidoglycan synthesis at the constriction site.

J Bacteriol. 1991 August; 173(15): 4751-4756




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