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. 1990 Aug 25;18(16):4843–4849. doi: 10.1093/nar/18.16.4843

A heteromeric transcription factor required for mammalian RNA polymerase II.

S Kitajima 1, Y Tanaka 1, T Kawaguchi 1, T Nagaoka 1, S M Weissman 1, Y Yasukochi 1
PMCID: PMC331960  PMID: 2395645

Abstract

A general transcription factor, FC, essential for specific initiation of in vitro transcription by mammalian RNA polymerase II was identified and a procedure developed to purify it to near homogeneity from HeLa cell nuclei. Purified FC is composed of two polypeptides of apparent molecular masses 80 kDa and 30 kDa, on SDS-PAGE, and has a native size of 280 kDa estimated by gel filtration column. Both polypeptides were shown to be essential for reconstituting in vitro transcription activity. Biochemical analysis showed that the 80 kDa and 30 kDa components were present in a 1:1 molar ratio. FC was also demonstrated to interact directly or indirectly with purified RNA polymerase II. Similarities between FC and transcription factors reported by others from human, rat or Drosophila cells are discussed.

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