α-Amanitin Blocks Translocation by Human RNA Polymerase II
نویسندگان
چکیده
منابع مشابه
Alpha-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 کاملSpecific 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 کاملNTP-driven translocation by human RNA polymerase II.
We report a "running start, two-bond" protocol to analyze elongation by human RNA polymerase II (RNAP II). In this procedure, the running start allowed us to measure rapid rates of elongation and provided detailed insight into the RNAP II mechanism. Formation of two bonds was tracked to ensure that at least one translocation event was analyzed. By using this method, RNAP II is stalled briefly a...
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 کاملGiardia lamblia RNA polymerase II: amanitin-resistant transcription.
Giardia lamblia is an early branching eukaryote, and although distinctly eukaryotic in its cell and molecular biology, transcription and translation in G. lamblia demonstrate important differences from these processes in higher eukaryotes. The cyclic octapeptide amanitin is a relatively selective inhibitor of eukaryotic RNA polymerase II (RNAP II) and is commonly used to study RNAP II transcrip...
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: 2004
ISSN: 0021-9258
DOI: 10.1074/jbc.m402163200