Importin subunit alpha-2 (KPNA2) (KPNA2)

Importin subunit alpha-2 (KPNA2) is a critical adapter protein in the classical nuclear import pathway, responsible for the translocation of proteins from the cytoplasm into the nucleus [UniProt: P52294]. It functions by recognizing and binding to the nuclear localization signal (NLS) of cargo proteins, subsequently forming a heterodimer with importin beta-1 to facilitate passage through the nuclear pore complex [PubMed: 28656247]. Beyond its fundamental transport role, KPNA2 is a key regulator of the cell cycle, DNA damage response, and cellular proliferation by controlling the nuclear availability of essential transcription factors and signaling molecules [PubMed: 30106424]. In many human malignancies, including breast, lung, and liver cancers, KPNA2 is significantly overexpressed and serves as a robust biomarker for poor prognosis, high histological grade, and increased metastatic potential [PubMed: 22545130]. Therapeutic strategies targeting KPNA2 mRNA, such as small interfering RNAs (siRNA) or antisense oligonucleotides (ASOs), aim to deplete protein levels and thereby disrupt the nuclear entry of oncogenic drivers [PubMed: 25605104]. However, because KPNA2 is involved in essential physiological processes, achieving high selectivity for tumor cells while minimizing systemic toxicity remains a primary challenge in its clinical development [PubMed: 28213505].

Other names

Karyopherin subunit alpha 2RCH1SRP1-alphaQIP2IPOA2PendulinAntigen identified by monoclonal antibody 13-2-2

Reduction of KPNA2 protein levels via RNA interference or antisense-mediated mRNA degradation, or competitive inhibition of the NLS-binding site to block nuclear import of oncogenic cargo [PubMed: 25605104, PubMed: 22417684].