Protein: DNA-directed RNA polymerase I subunit rpa1 (EC 2.7.7.6) (DNA-directed RNA polymerase I 190 kDa polypeptide) (DNA-directed RNA polymerase I largest subunit) (P15398)
Organism: Schizosaccharomyces pombe (strain 972 / ATCC 24843) (Fission yeast)
Function: DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Largest and catalytic core component of RNA polymerase I which synthesizes ribosomal RNA precursors. Forms the polymerase active center together with the second largest subunit. A single stranded DNA template strand of the promoter is positioned within the central active site cleft of Pol I. A bridging helix emanates from RPA1 and crosses the cleft near the catalytic site and is thought to promote translocation of Pol I by acting as a ratchet that moves the RNA-DNA hybrid through the active site by switching from straight to bent conformations at each step of nucleotide addition (By similarity).
Subcellular location: Nucleus, nucleolus {ECO:0000269|PubMed:2537310}.
Interaction partners:
- DNA-directed RNA polymerases I and III subunit RPAC2
- Probable DNA-directed RNA polymerase I subunit RPA2
- DNA-directed RNA polymerases I and III subunit RPAC1
- DNA-directed RNA polymerases I, II, and III subunit RPABC1
- DNA-directed RNA polymerases I, II, and III subunit RPABC3
- DNA-directed RNA polymerases I, II, and III subunit RPABC4
- DNA-directed RNA polymerase I subunit rpa49
- DNA-directed RNA polymerase I subunit RPA12
- DNA-directed RNA polymerase I subunit rpa43
- DNA-directed RNA polymerases I, II, and III subunit RPABC2
Sequence:
MNIAQPVSSEIKSVKFGIYDVDDVEKISVKQIVNPVLLDNLNHPTNGGLYDLALGPYLKNSVCATCHLDERYCPGHFGHIVLPIPAYHPLFFSQMYNLLRSTCLYCHHFKLSKVKVHLFFCRLKLLDYGLLNESEMVENVSLTEAIIKNSNGTPLEDGSDSEDSGLGHDDIAKDAATLMRIRDEFVAKSIADSRQNAHIDAQLTTLLLHERKKVVRAFYHAISSRKQCDNCQSFSPNFRKEGFAKIFEIPLSGKNLQFMEQTGKIRSDVLRDTSKKHHEDEGYDGDSDSSNESEVEGIDLFEEDPNPLKNKSKSPIAHGAKYMTSTEVRNHLRRLFVKENVVLSRLYAHKRGKPASADMFFLQNIAVPPTRFRPASKMGDEVHENIQNELLTRILQSSIQIASLSKDSTVEVNPDEKEGLERRSRAFELLINAFVQLQHDVNSLIDSNRNPSSGGQSRTVPPGIKQILEKKEGLFRKHMMGKRVNYAARSVISPDPNIETNEIGVPPVFATKLTYPEPVTLYNFNEMRNAVINGPHKWPGASHIQNEDGTLISLMPLTIEQRTALANQLLTPQSNLISSPYSYSRLINTNKKVYRHVRNGDMLILNRQPTLHKPSMMAHKARILPGEKTIRMHYANCNSYNADFDGDEMNMHFPQSTNARSEAQFIANTDSQYLVPTSGDPLRGLIQDHVVMGVWLTCKDTFYTRDEYQQLLFQALKPDETGMYGRIKTLPPAIQRPGIYWTGKQIISSVLLNLKPSDRPGLNLKSKAKVPGKYWSPDSEEGSVLFDDGELLCGILDKSSFGASAFGLVHSVHELYGPDIAGRLLSVLSRLFTAYAQMRGFTCRMDDLRLDEQGDNWRRQLLENGKSFGLEAASEYVGLSTDSPIALLNANLEEVYRDDEKLQGLDAAMKGKMNGLTSSIINKCIPDGLLTKFPYNHMQTMTVSGAKGSNVNVSQISCLLGQQELEGRRVPLMVSGKSLPSFVPYETSAKSGGFIASRFLTGIAPQEYYFHCMAGREGLIDTAVKTSRSGYLQRCLMKHLEGLCVQYDHTVRDSDGSIVQFHYGEDSLDVTKQKHLTQFEFSAKNYKSLIQKYKVKSVLSAVDSETASSYAKKALKKPYKYDPVLDKYPPSRYLGSVSEKFQRAVDEYTQKNPDKLIASKKESKLDDSLLNESKFKALMQLRYQQSLVDPGESVGVLASQSIGEPSTQMTLNTFHFAGFGAKNVTLGIPRLREIIMTASANIQTPTMTLRLNDGVSDKRASAFCKEVNKLVLSEVVRQVRVTEKISGQGSDEQSKTYAIRLDLYSRDEYQDEYGVLQEEIESTFSNRFLKILNRIIKSYLAKSKQRKSGGKDDTVPEVGQALKPLEDIDEAPIEGRAQEALEDEDNDATNEKMVSRSKQHASYEGPDEADKVALRQLKGSNKVEDVNMDEEEDEGFKSDESVSDFKERKLLEKQNTVSISERRELQLKTAKEILSNCKHLDFDYVNGEWATVELVFPINTEKLLMVSLVEKACSETVIHEIPGITRCFSKPPDSALDTVPKVITEGVNLKAIWEFYNEISMNDIYTNDIAAILRIYGVEAARNAIVHEVSSVFGVYGIAVDPRHLSLIADYMTFEGGYKAFNRMGIEYNTSPFAKMSFETTCHFLTEAALRGDVDDLSNPSSRLVVGRVGNFGTGSFDIFTPVVDSPAN