Non-catalytic component of the H/ACA small nucleolar ribonucleoprotein (H/ACA snoRNP), which catalyzes pseudouridylation of rRNA and is required for ribosome biogenesis (PubMed:9303321, PubMed:9843512). This involves the isomerization of uridine such that the ribose is subsequently attached to C5, instead of the normal N1 (PubMed:9303321, PubMed:9843512). Pseudouridine ('psi') residues may serve to stabilize the conformation of rRNAs (PubMed:9843512). The H/ACA snoRNP complex also mediates pseudouridylation of other types of RNAs (PubMed:21131909). The H/ACA snoRNP complex mediates pseudouridylation at position 93 in U2 snRNA (PubMed:21131909). Essential for growth (PubMed:9303321). Component of the small nucleolar ribonucleoprotein particles containing H/ACA-type snoRNAs (H/ACA snoRNPs) (PubMed:9556561, PubMed:9843512, PubMed:21131909). The protein component of the H/ACA snoRNP contains CBF5, GAR1, NHP2 and NOP10 (PubMed:9556561, PubMed:9843512, PubMed:21131909). The complex contains a stable core composed of CBF5 and NOP10, to which GAR1 and NHP2 subsequently bind. Interacts with snoRNAs (PubMed:9556561, PubMed:9843512). Methylated by HMT1, forming asymmetric dimethylarginines (DMA) within a domain referred to as an RGG box, made up of repeated Gly-Gly dipeptides interspersed with Arg and aromatic residues. Present with 5730 molecules/cell in log phase SD medium. Belongs to the GAR1 family.