Figure 1. Structure of mitochondrial RNA polymerase (mtRNAP).
Ribbon depiction of human mitochondrial RNA polymerase (PDB ID: 3SPA) colored according to domains: PPR domain: deepteal; N-terminal domain: grey; Palm: green; Fingers: pink; intercalating hairpin: purple, Thumb: orange. Important structural elements are indicated. Below is a schematic depiction of mtRNAP and T7 RNAP domains and important structural elements. Structurally homologous regions between mtRNAP and T7 RNAP are aligned.