FEATURES

FAMILY

DESCRIPTION

Also known as IMA1_HUMAN, KPNA2, RCH1, SRP1. Functions in nuclear protein import as an adapter protein for nuclear receptor KPNB1. Binds specifically and directly to substrates containing either a simple or bipartite NLS motif. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Heterodimer; with KPNB1 (PubMed:17596301). Interacts with ANP32E (By similarity). Component of a complex containing CSE1L, RAN and KPNA2. Interacts directly with CSE1L. Interacts with PLAG1. Interacts with APEX1 (via N-terminus). Interacts with FRG1 (via N-terminus). Interacts with ARL4A, CTNNBL1 and NBN. Interacts with SNAI1 (via zinc fingers) and SNAI2 (via zinc fingers). Interacts with BAG6 (PubMed:29042515). Interacts with AIFM2; this interaction likely mediates the translocation of AIFM2 into the nucleus upon oxidative stress.

EXTERNAL LINKS

KPNA2

Mutations

Mutation(s) distribution

Mutations table