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. 1978 Jun;134(3):1074–1080. doi: 10.1128/jb.134.3.1074-1080.1978

Relationship between cellular autolytic activity, peptidoglycan synthesis, septation, and the cell cycle in synchronized populations of Streptococcus faecium.

R P Hinks, L Daneo-Moore, G D Shockman
PMCID: PMC222357  PMID: 96095

Abstract

Synchronized, slowly growing (TD = 70 to 80 min) cultures were used to study several wall-associated parameters during the cell cycle: rate of peptidoglycan synthesis, septation, and cellular autolytic activity. The rate of peptidoglycan synthesis per cell declined during most of the period of chromosome replication (C), but increased during the latter part of C and into the period between chromosome termination and cell division (D). An increase in cellular septation was correlated with the increased rate of peptidoglycan synthesis. Cellular autolytic capacity increased during the early portion of C, reached a maximum late in C or early in D, and declined during D. Inhibition of DNA synthesis during C prevented the decline in autolytic capacity at the end of the cell cycle, caused a slight reduction in the rate of peptidoglycan synthesis, delayed but did not prevent septation, and prevented the impending cell division by inhibiting cell separation. Inhibition of DNA synthesis during D did not prevent the increase in autolytic capacity during the next C phase, but, once again, prevented the decline at the end of the subsequent cycle. Thus, increased autolytic capacity at the beginning of the cell cycle did not seem to be related to chromosome initiation, whereas decreased autolytic capacity at the end of the cell cycle seemed to be related to chromosome termination. The data presented are consistent with the role of autolytic enzyme activity in the previously proposed model for cell division of S. faecium (G.D. Shockman et al., Ann. N.Y Acad. Sci. 235:161-197, 1974).

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Selected References

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