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. 1972 Jan;109(1):391–398. doi: 10.1128/jb.109.1.391-398.1972

Release of the β-Galactosidase-Synthesizing System from Ultraviolet Catabolite Repression by Cyclic 3′,5′-Adenosine Monophosphate, Dark Repair, Photoreactivation, and Cold Treatment

P A Swenson 1
PMCID: PMC247290  PMID: 4333380

Abstract

Recovery from the inhibitory effect of ultraviolet irradiation on the induced synthesis of β-galactosidase was studied in Escherichia coli B/r. When irradiated cells (520 ergs/mm2 at 254 nm) were induced and incubated in minimal medium supplemented with Casamino Acids (conditions of catabolite repression), the ability to form enzyme was greatly reduced for about 100 min and then recovery began. The inhibition observed immediately after ultraviolet irradiation was partially reversed by cyclic 3′,5′-adenosine monophosphate (cyclic AMP) or by photoreactivation treatment. Inhibition was reduced if the cells were given cold treatment (5 C) before or during irradiation; the kinetics of induced enzyme formation in each case were similar to those of irradiated cells receiving cyclic AMP. These kinetics suggest that the cold treatments, like cyclic AMP, cause the release of the β-galactosidase-synthesizing system from catabolite repression. When irradiated cells were incubated for various times before cyclic AMP or photoreactivation treatment, some reversal of the inhibition of induced enzyme formation was obtained, but by 100 min the treatments were ineffective. Because 100 min was also the time at which dark recovery of enzyme formation began, the recovery process was interpreted to be the result of completion of DNA repair, which, in turn, released the β-galactosidase-synthesizing system from catabolite repression.

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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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