[en] DNA-dependent RNA polymerase from E. coli is rapidly inhibited by preincubation with pyridoxal 5′-phosphate. The enzyme is not inhibited by pyridoxamine 5′-phosphate or pyridoxine. Pyridoxal is about 10 times less effective than pyridoxal 5′-phosphate. Nucleoside triphosphates but not DNA, protect the enzyme from inhibition. Spectral data from the reaction mixture and NaBH4 reduction products indicate the formation of a Schiff base between the aldehyde group of pyridoxal 5′-phosphate and amino group of the enzyme. The results show that the inhibitor is reacting with a critical amino group presumably at the nucleoside phosphate binding site of the active center of the enzyme.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Venegas, Alejandro; Universidad Católica de Chile
Martial, Joseph ; Université de Liège - ULiège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Valenzuela, Pablo; Universidad Católica de Chile
Language :
English
Title :
Active site-directed inhibition of E. coli DNA-dependent RNA polymerase by pyridoxal 5′-phosphate
Publication date :
19 December 1973
Journal title :
Biochemical and Biophysical Research Communications
ISSN :
0006-291X
eISSN :
1090-2104
Publisher :
Academic Press, San Diego, United States - California
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
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Richardson Proc. Natl. Acad. Sci. U.S.A. 1966, 55:1616.
Fischer, Forrey, Hedrick, Hughes, Kent, Krebs Chemical and Biological Aspects of Pyridoxal Catalysis , E.E. Snell, P.M. Fasella, A. Braunstein, A. Rossi-Fanelli, Pergamon, N. Y.; 1963, 554.
Burgess J. Biol. Chem. 1969, 244:6168.
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