POLRMT

DNA-directed RNA polymerase, mitochondrial is an enzyme that in humans is encoded by the POLRMT gene.^[5][6]

POLRMT
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3SPA, 4BOC
Identifiers
Aliases	POLRMT, APOLMT, MTRNAP, MTRPOL, h-mtRPOL, polymerase (RNA) mitochondrial, RNA polymerase mitochondrial, COXPD55
External IDs	OMIM: 601778; MGI: 1915843; HomoloGene: 37996; GeneCards: POLRMT; OMA:POLRMT - orthologs
Gene location (Human) Chr. Chromosome 19 (human)[1] Band 19p13.3 Start 617,221 bp[1] End 633,537 bp[1]
Gene location (Mouse) Chr. Chromosome 10 (mouse)[2] Band 10|10 C1 Start 79,571,957 bp[2] End 79,582,415 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in left testis right testis apex of heart testicle mucosa of transverse colon gonad muscle of thigh right lobe of liver gastrocnemius muscle anterior pituitary Top expressed in right ventricle internal carotid artery external carotid artery temporal muscle primary oocyte sternocleidomastoid muscle triceps brachii muscle muscle of thigh motor neuron digastric muscle More reference expression data BioGPS More reference expression data
Gene ontology Molecular function DNA-directed 5'-3' RNA polymerase activity transferase activity DNA binding nucleotidyltransferase activity protein binding RNA binding mitochondrial promoter sequence-specific DNA binding sequence-specific DNA binding Cellular component mitochondrial matrix mitochondrial nucleoid mitochondrion mitochondrial DNA-directed RNA polymerase complex protein-containing complex Biological process mitochondrial transcription transcription initiation from mitochondrial promoter mitochondrion organization transcription, DNA-templated Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 5442 216151 Ensembl ENSG00000099821 ENSMUSG00000020329 UniProt O00411 Q8BKF1 RefSeq (mRNA) NM_005035 NM_172551 RefSeq (protein) NP_005026 NP_766139 NP_001394721 NP_001394722 NP_001394723 NP_001394724 NP_001394725 NP_001394726 NP_001394727 NP_001394728 Location (UCSC) Chr 19: 0.62 – 0.63 Mb Chr 10: 79.57 – 79.58 Mb PubMed search [3] [4]
Wikidata
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Function

This gene encodes a mitochondrial DNA-directed RNA polymerase. The gene product is responsible for mitochondrial gene expression as well as for providing RNA primers for initiation of replication of the mitochondrial genome. Although this polypeptide has the same function as the three nuclear DNA-directed RNA polymerases, it is more closely related to RNA polymerases of bacteriophage (including T7 RNA polymerase), mitochondrial polymerases of lower eukaryotes as well as chloroplastic RpoT polymerases.^[6]

Structure

The structure of the enzyme has been solved. It exhibits an overall structure similar to that of phage RNAP, but the initiation mechanism is different in that it requires initiation factors TFAM (only in mammals) and TFB2M.^[7] Elongation requires the elongation factor TEFM.^[8] The exact termination process is less understood, but MTERF1 is thought to play a role.^[9]