Heterogeneous nuclear ribonucleoprotein K (hnRNP K)

Heterogeneous nuclear ribonucleoprotein K (hnRNP K) is a multifunctional RNA- and DNA-binding protein of approximately 66 kDa that is encoded by the HNRNPK gene in humans[6][1][3]. As a member of the hnRNP family, hnRNP K uniquely contains three K homology (KH) domains, a K-protein interactive (KI) region, and a protein kinase-binding domain, enabling interaction with both nucleic acids and numerous proteins[1][3][5]. It plays critical roles in gene expression regulation at multiple levels, including chromatin organization, transcription, pre-mRNA processing and splicing, mRNA transport, and translation[7][6][3]. hnRNP K acts as a platform integrating protein and nucleic acid signaling, and it regulates key genes involved in cell cycle, proliferation, apoptosis, and differentiation[1][3][7][8]. Dysregulation or mislocalization of hnRNP K has been implicated in various cancers (as a proto-oncogene regulator and metastasis promoter) and in neurodegenerative disorders such as FTLD[7][2]. While currently there are no approved drugs targeting hnRNP K, its essential and widespread cellular functions, along with its role in disease, make it a potential therapeutic target and a biomarker, though with notable safety challenges due to its importance in normal cell biology[6][8][2].

Other names

protein KHNRNPKhnRPKheterogeneous nuclear ribonucleoprotein K proteinprotein H16 (simian homolog)

Potential mechanisms in investigational or experimental settings include modulation of RNA binding, disruption of its interaction with nucleic acids or protein partners, inhibition of nuclear-cytoplasmic shuttling, or suppression of target gene expression[7][3].