UniProt functional annotation for P62826

UniProt code: P62826.

Organism: Homo sapiens (Human).
Taxonomy: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.
 
Function: GTP-binding protein involved in nucleocytoplasmic transport. Required for the import of protein into the nucleus and also for RNA export. Involved in chromatin condensation and control of cell cycle (By similarity). The complex with BIRC5/ survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2.
 
Function: Enhances AR-mediated transactivation. Transactivation decreases as the poly-Gln length within AR increases.
 
Subunit: Monomer. Also forms a complex with CHC1 and interacts with the AR N-terminal poly-Gln region. The interaction with AR is inversely correlated with the poly-Gln length. Part of a complex consisting of RANBP9, Ran, DYRK1B and COPS5. Found in a nuclear export complex with RANBP3 and XPO1. Component of a nuclear export receptor complex composed of KPNB1, Ran, SNUPN and XPO1. Found in a trimeric export complex with SNUPN, Ran and XPO1. Interacts with RANBP10. In case of HIV-1 infection, found in a complex with HIV-1 Rev, RNAs containing a Rev response element (RRE) and XPO1. Found in a complex with HTLV-1 Rex, RANBP3 and XPO1. Interacts in its GTP-bound form with BIRC5/survivin at S and M phases of the cell cycle. Interacts with TERT; the interaction requires hydrogen peroxide-mediated phosphorylation of TERT and transports TERT to the nucleus. Interacts with MAD2L2. Interacts with RANBP10 (By similarity). Interacts with VRK1 and VRK3. Interacts with isoform 1 and isoform 2 of VRK2.
Subcellular location: Nucleus. Cytoplasm. Melanosome. Note=Predominantly nuclear during interphase (By similarity). Becomes dispersed throughout the cytoplasm during mitosis. Identified by mass spectrometry in melanosome fractions from stage I to stage IV.
Tissue specificity: Expressed in a variety of tissues.
Similarity: Belongs to the small GTPase superfamily. Ran family.
Sequence caution: Sequence=BAB93486.1; Type=Erroneous initiation; Note=Translation N-terminally extended;

Annotations taken from UniProtKB at the EBI.