PHAX — Phosphorylated adaptor for RNA export
PHAX 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.
PHAX'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 Processing Mixed RNA processing & translation | AUP1, B3GAT3, CFDP1, CMTM3, DENR, EIF4H, FBXW5, FUCA1 +13 more | View in SCUBA |
About the gene
| Synonyms | FLJ13193, RNUXA |
|---|---|
| Chromosome | 5: 126600925-126627252 |
| Predicted location | Intracellular |
| Essential gene | Yes |
| Protein class | Essential proteins, Predicted intracellular proteins, Transporters |
| Molecular function | RNA-binding |
| Biological process | Protein transport, Transport |
Function
A phosphoprotein adapter involved in the XPO1-mediated U snRNA export from the nucleus. Bridge components required for U snRNA export, the cap binding complex (CBC)-bound snRNA on the one hand and the GTPase Ran in its active GTP-bound form together with the export receptor XPO1 on the other. Its phosphorylation in the nucleus is required for U snRNA export complex assembly and export, while its dephosphorylation in the cytoplasm causes export complex disassembly. It is recycled back to the nucleus via the importin alpha/beta heterodimeric import receptor. The directionality of nuclear export is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Its compartmentalized phosphorylation cycle may also contribute to the directionality of export. Binds strongly to m7G-capped U1 and U5 small nuclear RNAs (snRNAs) in a sequence- unspecific manner and phosphorylation-independent manner (By similarity). Also plays a role in the biogenesis of U3 small nucleolar RNA (snoRNA). Involved in the U3 snoRNA transport from nucleoplasm to Cajal bodies. Binds strongly to m7G-capped U3, U8 and U13 precursor snoRNAs and weakly to trimethylated (TMG)-capped U3, U8 and U13 snoRNAs. Also binds to telomerase RNA.
Human Protein Atlas · Open Targets · UniProt
Gene annotation from the Human Protein Atlas and UniProt; see sources & licences.