NDLI: Mechanism of growth delay induced in Escherichia coli by near ultraviolet radiation.

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Mechanism of growth delay induced in Escherichia coli by near ultraviolet radiation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ramabhadran, T. V. Jagger, J.
Abstract	Continuously growing cultures of E. coli B/r were irradiated with a fluence of broad-band near-ultraviolet radiation (315-405 nm) sufficient to cause extensive growth delay and complete cessation of net RNA synthesis. Chloramphenicol treatment was found to stimulate resumption of RNA synthesis, similar to that observed with chloramphenicol treatment after amino-acid starvation. E. coli strains in which amino-acid starvation does not result in cessation of RNA synthesis ('relaxed' or rel- strains) show no cessation of growth and only a slight effect on the rate of growth or of RNA synthesis. These findings show that such near-UV fluences do not inactivate the RNA synthetic machinery but affect the regulation of RNA synthesis, in a manner similat to that produced by amino-acid starvation. Such regulation is believed to be mediated through alterations in concentration of guanosine tetraphosphate (ppGpp), and our estimations of ppGpp after near-UV irradiation are consistent with such an interpretation. These data, combined with earlier published data, strongly suggest that the mechanism of near-UV-induced growth delay in E. coli involves partial inactivation of certain tRNA species, which is interpreted by the cell in a manner similar to that of amino-acid starvation, causing a rise in ppGpp levels, a shut-off of net RNA synthesis, and the induction of a growth delay.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	1
Volume Number	73
Language	English
Publisher	National Academy of Sciences
Publisher Date	1976-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	RNA, Bacterial Biosynthesis RNA, Transfer Radiation Effects Amino Acids Metabolism Cell Division Chloramphenicol Pharmacology Escherichia Coli Guanine Nucleotides Models, Biological Mutation Thiouracil Ultraviolet Rays Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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