Heterogeneous nuclear ribonucleoprotein E1 (hnRNP E1)/poly(rC)-binding protein 1 (PCBP1) has five major isoforms, hnRNP-E1-E4 and hnRNP-E2-KL (a splice variant of hnRNP-E2). It is a member of the PCBP family or the triple K homology (KH) domain containing protein family. All isoforms of hnRNPE contain three repeats of the ribonucleoprotein KH domain, designated KH1, KH2 and KH3. hnRNP-E1 and hnRNP-E2 are predominantly nuclear with specific enrichment of hnRNP-E1 in nuclear speckles. Among the hnRNPE family, hnRNP-E1 and hnRNP-E2 share the highest amino acid sequence similarity. PCBP1 is ubiquitously expressed and is located on human chromosome 2p13.3.

Anti-hnRNP-E1 (C-terminal) (also known as PCBP1/2 and αCP1) specifically recognizes human, mouse, and rat hnRNP-E1.

Anti-hnRNP-E1 (C-terminal) antibody produced in rabbit may be used in immunoblotting and immunoprecipitation.

Heterogeneous nuclear ribonucleoproteins (hnRNPs) are important in biological activities such as transcription, pre-mRNA processing, mRNA translation and turnover. hnRNPE proteins are also implicated in mRNA stabilization, translation enhancement and translation silencing. Heterogeneous nuclear ribonucleoprotein E1 (hnRNP E1)/poly(rC)-binding protein 1 (PCBP1) acts as a tumor-suppressive splicing factor. Upregulation of this gene can repress the tumorigenicity of ovarian cancer, prostate cancer, gastric cancer, colon cancer and thyroid carcinoma cells.

Solution in 0.01 M phos­phate buffered saline, pH 7.4, containing 15 mM sodium azide.

For continuous use, store at 2–8 °C for up to one month. For extended storage, freeze in working aliquots. Repeated freezing and thawing, or storage in “frost-free” freezers, is not recommended. If slight turbidity occurs upon prolonged storage, clarify the solution by centrifugation before use. Working dilutions should be discarded if not used within 12 hours.

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