Multifunctional RNA-binding protein that recognizes the K-turn motif in ribosomal RNA, box H/ACA, box C/D and box C'/D' sRNAs (By similarity). When added to reconstituted ribonuclease P (RNase P) it increases the optimum temperature to that of the partially purified enzyme and causes a 5-fold increase in apparent Vmax. Binds the RNase P catalytic RNA. Optimum temperature is 72-76 degrees Celsius for RNase P reconstituted with this protein as well as protein subunits Rnp1-4. Part of the 50S ribosomal subunit (By similarity). May be part of the RNase P complex. Reconstituted enzyme missing individual protein subunits is suboptimally active, showing each subunit contributes to optimization of activity. Belongs to the eukaryotic ribosomal protein eL8 family. Extended N-terminus.