Abstract：
:Rpc25 is a strongly conserved subunit of RNA polymerase III with homology to Rpa43 in RNA polymerase I, Rpb7 in RNA polymerase II and the archaeal RpoE subunit. A central domain of Rpc25 can replaced the corresponding region of Rpb7 with little or no growth defect, underscoring the functional relatedness of these proteins. Rpc25 forms a heterodimer with Rpc17, another conserved component of RNA polymerase III. A conditional mutant (rpc25-S100P) impairs this interaction. rpc25-S100P and another conditional mutant obtained by complementation with the Schizosaccharomyces pombe subunit (rpc25-Sp) were investigated for the properties of their purified RNA polymerase III. The mutant enzymes were defective in the specific synthesis of pre-tRNA transcripts but acted at a wild-type level on poly[d(A-T)] templates. They were also indistinguishable from wild type in transcript elongation, cleavage and termination. These data indicate that Rpc25 is needed for transcription initiation but is not critical for the elongating properties of RNA polymerase III.
journal_name
Mol Microbioljournal_title
Molecular microbiologyauthors
Zaros C,Thuriaux Pdoi
10.1111/j.1365-2958.2004.04375.xsubject
Has Abstractpub_date
2005-01-01 00:00:00pages
104-14issue
1eissn
0950-382Xissn
1365-2958pii
MMI4375journal_volume
55pub_type
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