Mapping of Rpb3 and Rpb5 contact sites on two large subunits, Rpb1 and Rpb2, of the RNA polymerase II from fission yeast.
[Rpb1 and Rpb2] Mapping of the contact sites on two large subunits of the fission yeast Schizosaccharomyces pombe RNA polymerase II with two small subunits, Rpb3 and Rpb5, was carried out using the two-hybrid screening system in the budding yeast Saccharomyces cerevisiae. Rpb5 was found to interact with any fragment of Rpb1 that contained the region H, which is conserved among the subunit 1 homologues of all RNA polymerases, including the beta' subunit of prokaryotic RNA polymerases. In agreement with the fact that Rpb5 is shared among all three forms of eukaryotic RNA polymerases, the region H of RNA polymerase I subunit 1 (Rpa190) was also found to interact with Rpb5. On the other hand, two-hybrid screening of Rpb2 fragments from RNA polymerase II indicated the presence of an Rpb3 contact site in the region H which is conserved among the subunit 2 homologues of all RNA polymerases, including the beta subunit of prokaryotic RNA polymerases. Possible functions of the regions H in the subunits 1 and 2 are discussed.
Miyao
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National Institute of Genetics, Department of Molecular Genetics, Mishima, Shizuoka, Japan.
Honda
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Ishihama
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D001665:Binding Sites / Q000235:genetics; D015153:Blotting, Western; D002999:Clone Cells; D018076:DNA, Complementary / Q000737:chemistry; D004268:DNA-Binding Proteins / Q000378:metabolism; D009097:Multienzyme Complexes / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding / Q000235:genetics; D012318:RNA Polymerase I / Q000378:metabolism; D012319:RNA Polymerase II / Q000235:genetics* / Q000378:metabolism*; D051716:Replication Protein A; D012441:Saccharomyces cerevisiae / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D012568:Schizosaccharomyces / Q000235:genetics*; D029702:Schizosaccharomyces pombe Proteins; D017422:Sequence Analysis, DNA
D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D009097:Multienzyme Complexes; D051716:Replication Protein A; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D012319:RNA Polymerase II; C112110:RPB3 protein, S cerevisiae; C491782:rpb3 protein, S pombe; D012318:RNA Polymerase I