Action of α-Amanitin during Pyrophosphorolysis and Elongation by RNA Polymerase II
نویسندگان
چکیده
منابع مشابه
Specific Inhibition of Nuclear RNA Polymerase II by α-Amanitin Author(s):
a-Amanitin, a toxic substance from the mushroom Amanita phalloides, is a potent inhibitor of DNA-dependent RNA polymerase II (the nucleoplasmic form) from sea urchin, rat liver, and calf thymus. This compound exerts no effect on the activity of polymerase I (nucleolar form) or polymerase III (also nucleoplasmic). The inhibition is due to a specific interaction with polymerase II or with a compl...
متن کاملAlpha-amanitin blocks translocation by human RNA polymerase II.
Our laboratory has developed methods for transient state kinetic analysis of human RNA polymerase II elongation. In these studies, multiple conformations of the RNA polymerase II elongation complex were revealed by their distinct elongation potential and differing dependence on nucleoside triphosphate substrate. Among these are conformations that appear to correspond to different translocation ...
متن کاملAffinity isolation of RNA polymerase II on amanitin-Sepharose.
We report here the first case of an affinity isolation of eukaryotic RNA polymerase II. The procedure employs an affinity matrix composed of alpha-amanitin coupled to Sepharose 4B via a ten atom spacer. RNA polymerase II from either calf thymus or wheat germ binds to the amanitin-Sepharose, as indicated by subsequent elution with sodium dodecylsulfate-containing buffer and analysis by polyacryl...
متن کاملControl of Transcriptional Elongation by RNA Polymerase II: A Retrospective
The origins of our current understanding of control of transcription elongation lie in pioneering experiments that mapped RNA polymerase II on viral and cellular genes. These studies first uncovered the surprising excess of polymerase molecules that we now know to be situated at the at the 5' ends of most genes in multicellular organisms. The pileup of pol II near transcription start sites refl...
متن کاملRegulation of RNA Polymerase II Elongation by c-Myc
The genome-wide mapping presented in this issue by Rahl et al. (2010) demonstrates how the transcription factor c-Myc interfaces with the machinery that controls RNA polymerase II elongation. These findings account for the ability of c-Myc to activate the expression of a large number of genes that promote rapid proliferation.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1995
ISSN: 0021-9258
DOI: 10.1074/jbc.270.32.19114