Abstract
Lactococcus lactis species can survive periods of carbohydrate starvation for relatively long periods of time. In the first hours of starvation, however, the maximal glycolytic and arginine deiminase (ADI) pathway activities decline rapidly. The rate of decrease of the pathway activities diminishes as soon as the cells become depleted of energy-rich intermediates. Loss of glycolytic activity is associated with loss of glyceraldehyde 3-phosphate dehydrogenase, phosphoglycerate mutase and pyruvate kinase activities. Upon addition of sugar to starved cultures these enzymatic, and thus the glycolytic, activities can be restored to 100% values. The recovery of enzymatic activities is inhibited by chloramphenicol, indicating that protein synthesis is involved. In contrast, restoration of ADI pathway activity does not require de novo synthesis of proteins. General protein degradation and synthesis have been studied in growing and starving cells using [35S]methionine-labeling of proteins and two-dimensional gel analysis. The breakdown of bulk proteins in exponentially growing cells shows first-order rate kinetics (t1/2 of approximately 5 h). Following an initial breakdown of proteins with a t1/2 of 5 h during the first hour(s) of starvation, bulk proteins are degraded very slowly in starving energy-depleted cells. The breakdown of proteins during starvation appears to be (largely) nonspecific. The rate of synthesis of proteins decreases rapidly in the first hour(s) of starvation. From the onset of starvation on at least 45 proteins are no longer synthesized. During starvation relative induction of fourteen to fifteen proteins can be observed.
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Abbreviations
- ADI:
-
Arginine deiminase
- ATP:
-
adenosine triphosphate
- PEP:
-
phosphoenolpyruvate
- ΔΨ:
-
membrane potential
- ΔpH:
-
pH gradient
- PTS:
-
sugar phosphotransferase system
- CDM:
-
chemically defined medium
- TCA:
-
trichloro-acetic acid
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Kunji, E.R.S., Ubbink, T., Matin, A. et al. Physiological responses of Lactococcus lactis ML3 to alternating conditions of growth and starvation. Arch. Microbiol. 159, 372–379 (1993). https://doi.org/10.1007/BF00290920
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DOI: https://doi.org/10.1007/BF00290920