Protein
DNA-directed RNA polymerase I subunit 1
Organism
Arabidopsis thaliana
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 NRPA1 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.
Similarity
Belongs to the RNA polymerase beta' chain family.
Sequence
MAHAQTTEVCLSFHRSLLFPMGASQVVESVRFSFMTEQDVRKHSFLKVTSPILHDNVGNPFPGGLYDLKLGPKDDKQACNSCGQLKLACPGHCGHIELVFPIYHPLLFNLLFNFLQRACFFCHHFMAKPEDVERAVSQLKLIIKGDIVSAKQLESNTPTKSKSSDESCESVVTTDSSEECEDSDVEDQRWTSLQFAEVTAVLKNFMRLSSKSCSRCKGINPKLEKPMFGWVRMRAMKDSDVGANVIRGLKLKKSTSSVENPDGFDDSGIDALSEVEDGDKETREKSTEVAAEFEEHNSKRDLLPSEVRNILKHLWQNEHEFCSFIGDLWQSGSEKIDYSMFFLESVLVPPTKFRPPTTGGDSVMEHPQTVGLNKVIESNNILGNACTNKLDQSKVIFRWRNLQESVNVLFDSKTATVQSQRDSSGICQLLEKKEGLFRQKMMGKRVNHACRSVISPDPYIAVNDIGIPPCFALKLTYPERVTPWNVEKLREAIINGPDIHPGATHYSDKSSTMKLPSTEKARRAIARKLLSSRGATTELGKTCDINFEGKTVHRHMRDGDIVLVNRQPTLHKPSLMAHKVRVLKGEKTLRLHYANCSTYNADFDGDEMNVHFPQDEISRAEAYNIVNANNQYARPSNGEPLRALIQDHIVSSVLLTKRDTFLDKDHFNQLLFSSGVTDMVLSTFSGRSGKKVMVSASDAELLTVTPAILKPVPLWTGKQVITAVLNQITKGHPPFTVEKATKLPVDFFKCRSREVKPNSGDLTKKKEIDESWKQNLNEDKLHIRKNEFVCGVIDKAQFADYGLVHTVHELYGSNAAGNLLSVFSRLFTVFLQTHGFTCGVDDLIILKDMDEERTKQLQECENVGERVLRKTFGIDVDVQIDPQDMRSRIERILYEDGESALASLDRSIVNYLNQCSSKGVMNDLLSDGLLKTPGRNCISLMTISGAKGSKVNFQQISSHLGQQDLEGKRVPRMVSGKTLPCFHPWDWSPRAGGFISDRFLSGLRPQEYYFHCMAGREGLVDTAVKTSRSGYLQRCLMKNLESLKVNYDCTVRDADGSIIQFQYGEDGVDVHRSSFIEKFKELTINQDMVLQKCSEDMLSGASSYISDLPISLKKGAEKFVEAMPMNERIASKFVRQEELLKLVKSKFFASLAQPGEPVGVLAAQSVGEPSTQMTLNTFHLAGRGEMNVTLGIPRLQEILMTAAANIKTPIMTCPLLKGKTKEDANDITDRLRKITVADIIKSMELSVVPYTVYENEVCSIHKLKINLYKPEHYPKHTDITEEDWEETMRAVFLRKLEDAIETHMKMLHRIRGIHNDVTGPIAGNETDNDDSVSGKQNEDDGDDDGEGTEVDDLGSDAQKQKKQETDEMDYEENSEDETNEPSSISGVEDPEMDSENEDTEVSKEDTPEPQEESMEPQKEVKGVKNVKEQSKKKRRKFVRAKSDRHIFVKGEGEKFEVHFKFATDDPHILLAQIAQQTAQKVYIQNSGKIERCTVANCGDPQVIYHGDNPKERREISNDEKKASPALHASGVDFPALWEFQDKLDVRYLYSNSIHDMLNIFGVEAARETIIREINHVFKSYGISVSIRHLNLIADYMTFSGGYRPMSRMGGIAESTSPFCRMTFETATKFIVQAATYGEKDTLETPSARICLGLPALSGTGCFDLMQRVEL