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NHP2

This gene is a member of the H/ACA snoRNPs (small nucleolar ribonucleoproteins) gene family. snoRNPs are involved in various aspects of rRNA processing and modification and have been classified into two families: C/D and H/ACA. The H/ACA snoRNPs also include the DKC1, NOLA1 and NOLA3 proteins. These four H/ACA snoRNP proteins localize to the dense fibrillar components of nucleoli and to coiled (Cajal) bodies in the nucleus. Both 18S rRNA production and rRNA pseudouridylation are impaired if any one of the four proteins is depleted. The four H/ACA snoRNP proteins are also components of the telomerase complex. This gene encodes a protein related to Saccharomyces cerevisiae Nhp2p. Alternative splicing results in multiple transcript variants.
Protein class

Disease related genes, Human disease related genes, Ribosomal proteins

Predicted location

Intracellular

Single cell type specificity

Low cell type specificity

Immune cell specificity

Low immune cell specificity

Cell line specificity

Cell line enhanced (MCF7)

Interaction

Part of the H/ACA small nucleolar ribonucleoprotein (H/ACA snoRNP) complex, which contains NHP2/NOLA2, GAR1/NOLA1, NOP10/NOLA3, and DKC1/NOLA4, which is presumed to be the catalytic subunit (PubMed:11074001). The complex contains a stable core formed by binding of one or two NOP10-DKC1 heterodimers to NHP2; GAR1 subsequently binds to this core via DKC1 (PubMed:11074001). The complex binds a box H/ACA small nucleolar RNA (snoRNA), which may target the specific site of modification within the RNA substrate (PubMed:11074001). During assembly, the complex contains NAF1 instead of GAR1/NOLA1 (PubMed:11074001). The complex also interacts with TERC, which contains a 3'-terminal domain related to the box H/ACA snoRNAs (PubMed:11074001). Specific interactions with snoRNAs or TERC are mediated by GAR1 and NHP2. Associates with NOLC1/NOPP140 (PubMed:11074001). H/ACA snoRNPs interact with the SMN complex, consisting of SMN1 or SMN2, GEMIN2/SIP1, DDX20/GEMIN3, and GEMIN4. This is mediated by interaction between GAR1 and SMN1 or SMN2 (PubMed:11074001). The SMN complex may be required for correct assembly of the H/ACA snoRNP complex (PubMed:11074001). Component of the telomerase holoenzyme complex composed of one molecule of TERT, one molecule of WRAP53/TCAB1, two molecules of H/ACA ribonucleoprotein complex subunits DKC1, NOP10, NHP2 and GAR1, and a telomerase RNA template component (TERC) (PubMed:19179534, PubMed:20351177, PubMed:29695869). The telomerase holoenzyme complex is associated with TEP1, SMG6/EST1A and POT1 (PubMed:19179534).

Molecular function

Ribonucleoprotein, RNA-binding

More Types Infomation

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