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Protein PABPN1 PDB 3B4D.png
Available structures
PDBOrtholog search: PDBe RCSB
AliasesPABPN1, OPMD, PAB2, PABII, PABP-2, PABP2, poly(A) binding protein nuclear 1
External IDsOMIM: 602279 MGI: 1859158 HomoloGene: 3412 GeneCards: PABPN1
Gene location (Human)
Chromosome 14 (human)
Chr.Chromosome 14 (human)[1]
Chromosome 14 (human)
Genomic location for PABPN1
Genomic location for PABPN1
Band14q11.2Start23,321,289 bp[1]
End23,326,185 bp[1]
RNA expression pattern
PBB GE PABPN1 201544 x at fs.png

PBB GE PABPN1 201545 s at fs.png
More reference expression data
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr 14: 23.32 – 23.33 MbChr 14: 54.89 – 54.9 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

Polyadenylate-binding protein 2 (PABP-2) also known as polyadenylate-binding nuclear protein 1 (PABPN1) is a protein that in humans is encoded by the PABPN1 gene.[5][6]


This gene encodes an abundant nuclear protein that binds with high affinity to nascent poly(A) tails. The protein is required for progressive and efficient polymerization of poly(A) tails on the 3' ends of eukaryotic genes and controls the size of the poly(A) tail to about 250 nt. At steady-state, this protein is localized in the nucleus whereas a different poly(A) binding protein is localized in the cytoplasm. An expansion of the trinucleotide (GCN) repeat from normal 10 to 11-17 at the 5' end of the coding region of this gene leads to autosomal dominant oculopharyngeal muscular dystrophy (OPMD) disease.[7] Multiple splice variants have been described but their full-length nature is not known. One splice variant includes introns 1 and 6 but no protein is formed.[6]


PABPN1 has been shown to interact with SNW1.[8]


  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000100836 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000022194 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:".
  4. ^ "Mouse PubMed Reference:".
  5. ^ Brais B, Xie YG, Sanson M, Morgan K, Weissenbach J, Korczyn AD, Blumen SC, Fardeau M, Tomé FM, Bouchard JP (Aug 1995). "The oculopharyngeal muscular dystrophy locus maps to the region of the cardiac alpha and beta myosin heavy chain genes on chromosome 14q11.2-q13". Hum Mol Genet. 4 (3): 429–34. doi:10.1093/hmg/4.3.429. PMID 7795598.
  6. ^ a b "Entrez Gene: PABPN1 poly(A) binding protein, nuclear 1".
  7. ^ Brais B (January 2009). "Oculopharyngeal muscular dystrophy: a polyalanine myopathy". Current Neurology and Neuroscience Reports. 9 (1): 76–82. doi:10.1007/s11910-009-0012-y. PMID 19080757.
  8. ^ Kim YJ, Noguchi S, Hayashi YK, Tsukahara T, Shimizu T, Arahata K (May 2001). "The product of an oculopharyngeal muscular dystrophy gene, poly(A)-binding protein 2, interacts with SKIP and stimulates muscle-specific gene expression". Hum. Mol. Genet. England. 10 (11): 1129–39. doi:10.1093/hmg/10.11.1129. ISSN 0964-6906. PMID 11371506.

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