RPP30 is a highly conserved protein component of two essential ribonucleoprotein complexes involved in RNA processing. As part of ribonuclease P, RPP30 generates mature tRNA molecules by cleaving their 5'-ends, and it also functions within the MRP ribonuclease complex to cleave pre-rRNA sequences 1. Mechanistically, RPP30 forms a heterotetramer with Pop5 proteins that strongly interacts with specific stem-loop structures in RNase P RNA, with RPP30 assisting Pop5 in attaining functionally active conformations by shielding hydrophobic surfaces 1. The protein exhibits high structural conservation across species, as demonstrated by functional interchangeability between archaeal homologs 2. Beyond its RNA processing functions, RPP30 shows clinical significance as a stable reference gene for molecular assays due to its consistent expression levels across tissues 345. However, altered RPP30 expression has been implicated in glioblastoma pathogenesis, where decreased expression in older patients may contribute to cancer development through effects on RNA modifications and drug metabolism pathways 6. This dual role as both a fundamental cellular component and potential disease biomarker highlights RPP30's importance in both normal cellular function and pathological conditions 7.