Intracellular protein breakdown in non-growing cells of Escherichia coli.
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| Abstract |
1. When Escherichia coli leu(-) was incubated at 35 degrees in a medium based on minimal medium, but with the omission of phosphate ions, or glucose, or NH(4) (+) ions and leucine, intracellular protein was degraded at a rate of about 5%/hr. in each case. If Mg(2+) ions were omitted, however, the rate of degradation was 2.9%/hr. 2. Under certain conditions of incubation, protein degradation was inhibited. The inhibitor was neither NH(4) (+) ions nor amino acids, and its properties were not those of a protein, but it might be an unstable species of RNA. 3. Although a large part of the cell protein was degraded at about 5%/hr. during starvation of NH(4) (+) ions and leucine, some proteins were lost at more rapid rates, whereas others were lost at lower rates or not at all. 4. In particular, beta-galactosidase activity was lost at about 8%/hr. during starvation of NH(4) (+) ions and leucine, whereas d-serine-deaminase and alkaline-phosphatase activities were stable. During starvation of Mg(2+) ions, all three enzyme activities were stable.
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| Authors | N S Willetts |
| Journal | The Biochemical journal (Biochem J) Vol. 103 Issue 2 Pg. 453-61 (May 1967) ISSN: 0264-6021 [Print] England |
| PMID | 5340366 (Publication Type: Journal Article) |
| Chemical References |
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