Abstract
Gest and Mandelstam have reported1 that β-galactosidase from Escherichia coli is more heat labile in the presence of fructose-1,6-diphosphate (FDP) than in its absence. They found the effect to be quite specific: of the other sugars and phosphorylated esters tested, only glucose-6-phosphate (G6P) weakly, but significantly, increased the heat lability of the enzyme. These results support the possibility that β-galactosidase possesses a specific binding site for FDP. Gest and Mandelstam1 suggested that FDP, which is a key intermediate in carbohydrate metabolism, might be the repressor metabolite postulated by Vogel2 and Szilard3. If this were true, catabolite repression would be effected by the production of FDP, which would then combine with nascent β-galactosidase to prevent the enzyme from leaving the ribosomes on which it is being synthesized.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Gest, H., and Mandelstam, J., Nature, 211, 72 (1966).
Vogel, H. J., Proc. U.S. Nat. Acad. Sci., 43, 491 (1957).
Szilard, L., Proc. U.S. Nat. Acad. Sci., 46, 271 (1960).
Prevost, C., and Moses, V., Biochem. J. (in the press).
Moses, V., and Prevost, C., Biochem. J., 100, 336 (1966).
Jacob, F., and Monod, J., J. Mol. Biol., 3, 318 (1961).
Palmer, J., and Moses, V., Biochem. J. (in the press).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
BREWER, M., MOSES, V. Metabolite-promoted Heat Lability of β-Galactosidase and its Relation to Catabolite Repression. Nature 214, 272–273 (1967). https://doi.org/10.1038/214272a0
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1038/214272a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.