Genetic regulatory mechanisms in the synthesis of proteins

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The synthesis of enzymes in bacteria follows a double genetic control. The socalled structural genes determine the molecular organization of the proteins. Other, functionally specialized, genetic determinants, called regulator and operator genes, control the rate of protein synthesis through the intermediacy of cytoplasmic components or repressors. The repressors can be either inactivated (induction) or activated (repression) by certain specific metabolites. This system of regulation appears to operate directly at the level of the synthesis by the gene of a shortlived intermediate, or messenger, which becomes associated with the ribosomes where protein synthesis takes place.

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    This work has been aided by grants from the National Science Foundation, the Jane Coffin Childs Memorial Fund for Medical Research and the Commissariat à l’Energie Atomique.

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