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Gene Review

rpb3  -  RNA polymerase II subunit 3

Schizosaccharomyces pombe 972h-

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High impact information on rpb3

  • Using the degenerated primers designed after amino acid micro-sequencing of the 40 kDa third-largest polypeptide (subunit 3), we cloned the subunit 3 gene (rpb3) and determined its DNA sequence [1].
  • Taken together with the sequence of parts of PCR-amplified cDNA, the predicted coding sequence of rpb3, interrupted by two introns, was found to encode a polypeptide of 297 amino acid residues in length with a molecular weight of 34 kDa [1].
  • The protein-to-mRNA ratio or the translation efficiency is low for the rpb1, rpb2, rpb3 and rpb11 genes, encoding the homologues of subunits beta', beta, alpha and alpha, respectively, of the prokaryotic RNA polymerase core enzyme [2].
  • To gain an insight into the roles of subunit 3, the eukaryotic homologue of alpha, temperature-sensitive mutants of the fission yeast, Schizosaccharomyces pombe, have been isolated after transformation of the mutagenized rpb3 gene encoding mutant subunit 3 of RNA polymerase II [3].
  • For the isolation of subunit complexes formed in the virus-infected cells, a glutathione S -transferase (GST) sequence was fused to the rpb3 cDNA to produce GST-Rpb3 fusion protein and a decahistidine-tag sequence was inserted into the rpb1 cDNA to produce Rpb1H protein [4].


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