NCBP2 — Nuclear cap binding protein subunit 2
NCBP2 belongs to a gene co-expression module in 2 of 28 SCUBA cell types. Each module groups genes that rise and fall together in that cell type; the genes it shares a module with are its closest co-expression partners there.
NCBP2's module in each cell type
| Cell type | Module | Shares the module with | |
|---|---|---|---|
| CD4⁺ T cells | Vesicular trafficking Housekeeping | ACSL4, ARL8B, BLOC1S2, C3orf38, DTX3L, EFCAB14, GGA2, HMGXB3 +17 more | View in SCUBA |
| Innate lymphoid cells | RNA Splicing Processing RNA processing & translation | ATP5F1C, CHMP2A, CHMP4A, CYBA, DSTN, DYNC1I2, DYNLRB1, FKBP3 +16 more | View in SCUBA |
About the gene
| Synonyms | Cbc2, CBP20, NIP1 |
|---|---|
| Chromosome | 3: 196935402-196942594 |
| Predicted location | Intracellular |
| Essential gene | Yes |
| Protein class | Essential proteins, Predicted intracellular proteins, Transporters |
| Molecular function | RNA-binding |
| Biological process | mRNA processing, mRNA splicing, mRNA transport, Nonsense-mediated mRNA decay, RNA-mediated gene silencing, Translation regulation, Transport |
Function
Component of the cap-binding complex (CBC), which binds co- transcriptionally to the 5' cap of pre-mRNAs and is involved in various processes such as pre-mRNA splicing, translation regulation, nonsense- mediated mRNA decay, RNA-mediated gene silencing (RNAi) by microRNAs (miRNAs) and mRNA export. The CBC complex is involved in mRNA export from the nucleus via its interaction with ALYREF/THOC4/ALY, leading to the recruitment of the mRNA export machinery to the 5' end of mRNA and to mRNA export in a 5' to 3' direction through the nuclear pore. The CBC complex is also involved in mediating U snRNA and intronless mRNAs export from the nucleus. The CBC complex is essential for a pioneer round of mRNA translation, before steady state translation when the CBC complex is replaced by cytoplasmic cap-binding protein eIF4E. The pioneer round of mRNA translation mediated by the CBC complex plays a central role in nonsense-mediated mRNA decay (NMD), NMD only taking place in mRNAs bound to the CBC complex, but not on eIF4E-bound mRNAs. The CBC complex enhances NMD in mRNAs containing at least one exon- junction complex (EJC) via its interaction with UPF1, promoting the interaction between UPF1 and UPF2. The CBC complex is also involved in 'failsafe' NMD, which is independent of the EJC complex, while it does not participate in Staufen-mediated mRNA decay (SMD). During cell proliferation, the CBC complex is also involved in microRNAs (miRNAs) biogenesis via its interaction with SRRT/ARS2, thereby being required for miRNA-mediated RNA interference. The CBC complex also acts as a negative regulator of PARN, thereby acting as an inhibitor of mRNA deadenylation. In the CBC complex, NCBP2/CBP20 recognizes and binds capped RNAs (m7GpppG-capped RNA) but requires NCBP1/CBP80 to stabilize the movement of its N-terminal loop and lock the CBC into a high affinity cap-binding state with the cap structure. The conventional cap-binding complex with NCBP2 binds both small nuclear RNA (snRNA) and messenger (mRNA) and is involved in their export from the nucleus.
Human Protein Atlas · Open Targets · UniProt
Gene annotation from the Human Protein Atlas and UniProt; see sources & licences.