Recombinant Bovine Heterogeneous nuclear ribonucleoproteins A2/B1 (HNRNPA2B1)

Function

Heterogeneous nuclear ribonucleoprotein (hnRNP) that associates with nascent pre-mRNAs, packaging them into hnRNP particles. The hnRNP particle arrangement on nascent hnRNA is non-random and sequence-dependent and serves to condense and stabilize the transcripts and minimize tangling and knotting. Packaging plays a role in various processes such as transcription, pre-mRNA processing, RNA nuclear export, subcellular location, mRNA translation and stability of mature mRNAs. Forms hnRNP particles with at least 20 other different hnRNP and heterogeneous nuclear RNA in the nucleus. Involved in transport of specific mRNAs to the cytoplasm in oligodendrocytes and neurons: acts by specifically recognizing and binding the A2RE (21 nucleotide hnRNP A2 response element) or the A2RE11 (derivative 11 nucleotide oligonucleotide) sequence motifs present on some mRNAs, and promotes their transport to the cytoplasm (By similarity). Specifically binds single-stranded telomeric DNA sequences, protecting telomeric DNA repeat against endonuclease digestion (By similarity). Also binds other RNA molecules, such as primary miRNA (pri-miRNAs): acts as a nuclear 'reader' of the N6-methyladenosine (m6A) mark by specifically recognizing and binding a subset of nuclear m6A-containing pri-miRNAs. Binding to m6A-containing pri-miRNAs promotes pri-miRNA processing by enhancing binding of DGCR8 to pri-miRNA transcripts. Involved in miRNA sorting into exosomes following sumoylation, possibly by binding (m6A)-containing pre-miRNAs. Acts as a regulator of efficiency of mRNA splicing, possibly by binding to m6A-containing pre-mRNAs (By similarity). Plays a role in the splicing of pyruvate kinase PKM by binding repressively to sequences flanking PKM exon 9, inhibiting exon 9 inclusion and resulting in exon 10 inclusion and production of the PKM M2 isoform (By similarity)

Subcellular Location

Nucleus, nucleoplasm; Cytoplasmic granule; Secreted, extracellular exosome

Subunit

Identified in the spliceosome C complex. Identified in a IGF2BP1-dependent mRNP granule complex containing untranslated mRNAs. Interacts with IGF2BP1. Interacts with C9orf72. Interacts with DGCR8. Interacts with TARDBP. Interacts with CKAP5 (By similarity). Interacts with PPIA/CYPA (By similarity). Interacts (via C-terminus) with FAM76B; the interaction results in retention of HNRNPA2B1 in the nucleus and inhibition of the NF-kappa-B-mediated inflammatory pathway (By similarity). Interacts with NF-kappa-B inhibitors NFKBIA and NFKBIE; the interaction may be mediated by the RRM2 domain of HNRNPA2B1, and HNRNPA2B1 may interact simultaneously with FAM76B and either NFKBIA or NFKBIE to form a complex (By similarity). Interacts with CEP112 (By similarity)

• PubMed: CI-1L3IC7RQC1O17 (FEB-)