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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The fission yeast Schizosaccharomyces pombe rpb6 gene encodes the common phosphorylated subunit of RNA polymerase and complements a mutation in the corresponding gene of Saccharomyces cerevisiae.

A single-copy gene, homologous to the RPB6 gene from Saccharomyces cerevisiae, encoding a small phosphorylated subunit common to all three forms of nuclear DNA-dependent RNA polymerase was isolated from the fission yeast Schizosaccharomyces pombe. Its cDNA copy consists of an open reading frame of 142 codons and encodes an acidic protein (predicted pI 4.1) with a M(r) of 15,730. The genomic copy of Sz. pombe rpb6 contains an intron (219 nucleotides) located at codon 92, a position which does not correspond to the single intron of the S. cerevisiae gene. The sequencing of both genomic and cDNA copies of rpb6 allowed us to determine the probable positions of the start and stop of rpb6 transcription and to identify a putative TATA box. The primary structures of the Sz. pombe and S. cerevisiae Rpb6 proteins have 60.7% identity, with the same general organization: a highly acidic N-terminal region followed by a short basic region and a C terminus featuring a putative heptad Leu repeat. The C-terminal half of the sequence is particularly well conserved and, therefore, probably contains the most important functional domain. Moreover, a heterospecific complementation test showed that rpb6 from Sz. pombe fully complements a complete deletion of its S. cerevisiae homologue.[1]


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