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Rpp20 subunit of nuclear RNase MRP and P The nuclear RNase P of Saccharomyces cerevisiae is made up of at least nine protein subunits; Pop1, Pop3, Pop4, Pop5, Pop6, Pop7, Pop8, Rpr2 and Rpp1. Many of these subunits seem to be present also in the RNase MRP, with the exception of Rpr2 (Rpp21) which is unique to RNase P. Human nuclear RNase P and MRP appear to contain at least 10 protein subunits, Rpp14, Rpp20, Rpp21, Rpp25, Rpp29, Rpp30, Rpp38, Rpp40, hPop1 and hPop5, although there is recent evidence that not all of these subunits are shared between P and MRP. Archaeal RNase P has at least four protein subunits homologous to eukaryotic RNase P/MRP proteins. In the yeast RNase P, Pop6 and Pop7 (the Rpp20 homolog) interact with each other and they are both interaction partners of Pop4; in the human MRP Rpp25 and Rpp20 interact with each other and Rpp25 binds to Rpp29 (Pop4).
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Jiyao W et al.(2023). "The conserved domain database in 2023.",