KPNB1

Nucleocytoplasmic transport, a signal- and energy-dependent process, takes place through nuclear pore complexes embedded in the nuclear envelope. The import of proteins containing a nuclear localization signal (NLS) requires the NLS import receptor, a heterodimer of importin alpha and beta subunits also known as karyopherins. Importin alpha binds the NLS-containing cargo in the cytoplasm and importin beta docks the complex at the cytoplasmic side of the nuclear pore complex. In the presence of nucleoside triphosphates and the small GTP binding protein Ran, the complex moves into the nuclear pore complex and the importin subunits dissociate. Importin alpha enters the nucleoplasm with its passenger protein and importin beta remains at the pore. Interactions between importin beta and the FG repeats of nucleoporins are essential in translocation through the pore complex. The protein encoded by this gene is a member of the importin beta family. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2013]

Description

Karyopherin subunit beta 1

Tissue specificity

Low tissue specificity

Subcell location

Nucleoplasm, Nuclear membrane, Cytosol

Predicted location

Intracellular

Protein family

Mapped to neXtProt
Mapped to UniProt SWISS-PROT
Plasma proteins
Predicted intracellular proteins
Protein evidence (Ezkurdia et al 2014)
Protein evidence (Kim et al 2014)
Transporters

Chromosome

17 (47649476 - 47685505)

Ensembl ID

ENSG00000108424  (ver. 103.38)

Orthologs

Mouse Kpnb1: ENSMUSG00000001440

UniProt

Q14974

neXtProt

NX_Q14974

Human splice variants
Mouse splice variants

Protein structure