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. 1973 Oct;116(1):271–278. doi: 10.1128/jb.116.1.271-278.1973

Abolition of Crypticity of Arthrobacter pyridinolis Toward Glucose and α-Glucosides by Tricarboxylic Acid Cycle Intermediates

Mark E Sobel 1, Ellen B Wolfson 1, Terry A Krulwich 1
PMCID: PMC246418  PMID: 4745416

Abstract

Arthrobacter pyridinolis cannot grow on glucose as sole carbon source, although the cells possess catabolic enzymes of the Embden-Meyerhof and pentose phosphate pathways as well as a complete tricarboxylic acid cycle. Crypticity toward glucose is abolished by a period of growth in a medium containing malate, succinate, citrate, or fumarate in addition to glucose. Other carbon sources, which support as rapid growth as does malate (e.g. asparagine), do not enable the cells to use glucose. Malate, succinate, citrate, and fumarate abolish crypticity toward glucose only in the second phase of diauxic growth after the tricarboxylic acid cycle intermediate has been depleted. This sequence of events, first observed in growth curves, has been verified by experiments in which the incorporation of radioactive substrates into trichloroacetic acid-insoluble cellular material was followed. The tricarboxylic acid cycle intermediates which confer the ability to utilize glucose also enhance the utilization of the αglucosides sucrose and maltose. The mechanism whereby growth on certain tricarboxylic acid cycle intermediates confers the subsequent ability to grow on glucose is related to a transport system for glucose and α-glucosides. This transport system has been assayed by measuring the uptake of [1-14C]-2-deoxyglucose. Cells grown for varying periods of time in asparagine, asparagine plus glucose, or malate do not transport 2-deoxyglucose. Cells from malate-glucose cultures that are in the exponential phase of growth on glucose can transport 2-deoxyglucose. Transport of 2-deoxyglucose shows Michaelis-Menten kinetics with a Km of 2.9 × 10−4 M. It is competitively inhibited by glucose, α-methylglucopyranoside, and maltose. The transport of 2-deoxyglucose is inhibited by cyanide, dinitrophenol, azide, and N-ethylmaleimide, but not by malonate or fluoride. No phosphoenolpyruvate: d-glucose phosphotransferase activity has been detected, and the 2-deoxyglucose transported into the cell is not phosphorylated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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