Component of the telomerase ribonucleoprotein complex that is essential for the replication of chromosome termini (PubMed:19179534). Also a component of the ribonucleoprotein vaults particle, a multi-subunit structure involved in nucleo-cytoplasmic transport (By similarity). Responsible for the localizing and stabilizing vault RNA (vRNA) association in the vault ribonucleoprotein particle. Binds to TERC (By similarity). Associated component of the telomerase holoenzyme complex (PubMed:19179534). Component of the vault ribonucleoprotein particle, at least composed of MVP, PARP4 and one or more vault RNAs (vRNAs) (By similarity). Binds to VAULTRC1, VAULTRC2 and VAULTRC4/hvg4 vRNAs (By similarity). Ubiquitous. May be due to an exon inclusion.