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. 2019 Nov 21;8(12):533. doi: 10.3390/plants8120533

Figure 2.

Figure 2

Bacteriophage-type plant organellar RNA polymerases. (A) Domain organization of bacteriophage-related RNAP. These enzymes share a C-terminal or polymerization domain that is divided into three subdomains: Fingers, palm, and thumb, and a N-terminal domain involved in promoter opening and RNA binding. The N-terminal domain is colored orange and the subdomains of the fingers, thumb, and palm of blue, green, and red, respectively. mtHsRNAP associates with two accessory subunits (TFB2M and TFAM) to open double-stranded DNA and contains a N-terminal pentatricopeptide repeat (PPR)-domain and a tether helix not present in plant mitochondrial RNAPs. (B) Structural model of the mtAtRNAP compared to bacteriophage T7RNAP and human mtRNAP during transcription initiation [40,53].