Protein: mRNA-capping enzyme catalytic subunit (Virus termination factor large subunit) (VTF large subunit) (mRNA-capping enzyme 97 kDa subunit) (mRNA-capping enzyme D1 subunit) (mRNA-capping enzyme large subunit) [Includes: Polynucleotide 5'-triphosphatase (EC 3.6.1.74) (mRNA 5'-triphosphatase) (TPase); mRNA guanylyltransferase (EC 2.7.7.50) (GTP--RNA guanylyltransferase) (GTase); mRNA (guanine-N(7))-methyltransferase (EC 2.1.1.56) (mRNA cap methyltransferase)] (P04298)
Organism: Vaccinia virus (strain Western Reserve) (VACV) (Vaccinia virus (strain WR))
Function: Catalytic subunit of the mRNA capping enzyme which catalyzes three enzymatic reactions: the 5' triphosphate end of the pre-mRNA is hydrolyzed to a diphosphate by RNA 5' triphosphatase; the diphosphate RNA end is capped with GMP by RNA guanylyltransferase and the GpppN cap is methylated by RNA (guanine-N7) methyltransferase. Heterodimeric mRNA capping enzyme catalyzes the linkage of a N7-methyl-guanosine moiety to the first transcribed nucleotide (cap 0 structure), whereas the methyltransferase OPG102 is responsible for a second methylation at the 2'-O position of the ribose (cap 1 structure). Also involved in early viral gene transcription termination and intermediate viral gene transcription initiation. Early gene transcription termination requires the termination factor VTF, the DNA-dependent ATPase NPH-I/OPG123 and the RAP94/OPG109 subunit of the viral RNA polymerase, as well as the presence of a specific termination motif. Binds, together with RAP94/OPG109, to the termination motif 5'-UUUUUNU-3' in the nascent early mRNA.
Subcellular location: Virion {ECO:0000305}. Note=All the enzymes and other proteins required to synthesize early mRNAs are packaged within the virion core along with the DNA genome.
Sequence: MDANVVSSSTIATYIDALAKNASELEQRSTAYEINNELELVFIKPPLITLTNVVNISTIQESFIRFTVTNKEGVKIRTKIPLSKVHGLDVKNVQLVDAIDNIVWEKKSLVTENRLHKECLLRLSTEERHIFLDYKKYGSSIRLELVNLIQAKTKNFTIDFKLKYFLGSGAQSKSSLLHAINHPKSRPNTSLEIEFTPRDNETVPYDELIKELTTLSRHIFMASPENVILSPPINAPIKTFMLPKQDIVGLDLENLYAVTKTDGIPITIRVTSNGLYCYFTHLGYIIRYPVKRIIDSEVVVFGEAVKDKNWTVYLIKLIEPVNAINDRLEESKYVESKLVDICDRIVFKSKKYEGPFTTTSEVVDMLSTYLPKQPEGVILFYSKGPKSNIDFKIKKENTIDQTANVVFRYMSSEPIIFGESSIFVEYKKFSNDKGFPKEYGSGKIVLYNGVNYLNNIYCLEYINTHNEVGIKSVVVPIKFIAEFLVNGEILKPRIDKTMKYINSEDYYGNQHNIIVEHLRDQSIKIGDIFNEDKLSDVGHQYANNDKFRLNPEVSYFTNKRTRGPLGILSNYVKTLLISMYCSKTFLDDSNKRKVLAIDFGNGADLEKYFYGEIALLVATDPDADAIARGNERYNKLNSGIKTKYYKFDYIQETIRSDTFVSSVREVFYFGKFNIIDWQFAIHYSFHPRHYATVMNNLSELTASGGKVLITTMDGDKLSKLTDKKTFIIHKNLPSSENYMSVEKIADDRIVVYNPSTMSTPMTEYIIKKNDIVRVFNEYGFVLVDNVDFATIIERSKKFINGASTMEDRPSTRNFFELNRGAIKCEGLDVEDLLSYYVVYVFSKR
InterPro domains: - IPR004971: mRNA (guanine-N(7))-methyltransferase domain (domain) [560-844]
- IPR048425: mRNA capping enzyme catalytic subunit, GTase, NTPase domain (domain) [225-338]
- IPR048426: mRNA-capping enzyme catalytic subunit, GTase, OB fold (domain) [397-534]
- IPR039753: mRNA cap guanine-N7 methyltransferase (family) [565-843]
- IPR046429: mRNA-capping enzyme catalytic subunit, nucleotidyltransferase domain superfamily (homologous_superfamily) [218-394]
- IPR029063: S-adenosyl-L-methionine-dependent methyltransferase superfamily (homologous_superfamily) [543-844]
- IPR046428: mRNA-capping enzyme catalytic subunit, OB fold domain superfamily (homologous_superfamily) [395-528]
- IPR019602: mRNA capping enzyme catalytic subunit, RNA triphosphatase domain, virus (domain) [29-222]
- IPR046430: mRNA-capping enzyme catalytic subunit, RNA triphosphatase domain superfamily (homologous_superfamily) [11-217]
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0005515 (protein binding)
Biological Process (BP): GO:0008150 (biological process), GO:0016032 (viral process), GO:0019080 (viral gene expression), GO:0019083 (viral transcription), GO:0039695 (DNA-templated viral transcription)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0018995 (host cellular component), GO:0033643 (host cell part), GO:0043657 (host cell), GO:0033646 (host intracellular part), GO:0043656 (host intracellular region), GO:0033647 (host intracellular organelle), GO:0030430 (host cell cytoplasm), GO:0033648 (host intracellular membrane-bounded organelle), GO:0042025 (host cell nucleus)