Heterogeneous nuclear ribonucleoproteins (hnRNPs) constitute a set of polypeptides that contribute to mRNA transcription and pre-mRNA processing as well as mature mRNA transport to the cytoplasm and translation. They also bind heterogeneous nuclear RNA (hnRNA), which are the transcripts produced by RNA Polymerase II. There are approximately 20 known hnRNP proteins, which range in size from 34 kDa to 120 kDa, and their complexes are the major constituents of the spliceosome. The majority of hnRNP proteins components are localized to the nucleus; however some shuttle between the nucleus and the cytoplasm, such as hnRNP K. hnRNP K, a 65 kDa protein, recruits a variety of molecular partners through two K homologous (KH) domains, which are required for protein-protein interactions. hnRNP K also contains several potential phosphorylation sites, including Ser 302, the major site of PKCd phosphorylation, which are thought to regulate various cellular functions, including sequence-specific DNA binding, transcription, RNA binding and nucleocytoplasmic shuttling.
Hybridoma produced by the fusion of splenocytes from BALB/c mice immunized with a synthetic peptide derived from the C-terminal of the hnRNP-K protein and mouse myeloma Ag8563 cells. Sequence common in human, mouse, rat, rabbit and chicken
Colorectal cancer tissue, Calu6 and HT29 cell lysates
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Left and Center: Immunohistochemical staining of normal colon (left) and colon carninoma (center) using hnRNP-K antibody (Cat. No. X2068M).Right: Western blot using hnRNP-K antibody on Calu6 (1) and HT29 (2) cell lysates.
1. Wei, C.C., et al. (2006). Heterogeneous nuclear ribonucleoprotein K modulates angiotensinogen gene expression in kidney cells. J. Biol. Chem. 281(35):25344-253552. Dzwonek, A., et al. (2006). The diverse involvement of heterogeneous nuclear ribonucleoprotein K in mitochondrial response to insulin. FEBS Lett. 580(7):1839-18453. Carpenter, B., et al. (2006). Heterogeneous nuclear ribonucleoprotein K is over expressed, aberrantly localised and is associated with poor prognosis in colorectal cancer. Br. J. Cancer. 95(7):921-927