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External IDsGeneCards: [1]
RefSeq (mRNA)



RefSeq (protein)



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Epiregulin (EPR) is a protein that in humans is encoded by the EREG gene.[1][2]


Epiregulin consists of 46 amino acid residues. Its secondary structure contains approximately 30 percent of β-sheet in the strand.[3] Some of the residues form loops and turns due to the hydrogen bonding.[3] The percentage of β-sheet in epiregulin depends on the domain and the secondary structures that they occupy. The polymeric molecules of epiregulin has the formula weight of 5280.1 g/mol with a polypeptide(L), a polymer type.[3]

Structural motifs in most proteins have typical connections in an all β motif. Meaning that the polypeptide chains do not make a crossover connection or in so far as this type of connection has not been observed. Epiregulin is one of the proteins that occupies a typical connection in all β motif. Furthermore, as the structure of epiregulin forms a chain in an all β motif, it also forms β hairpin structural motif. A β hairpin is when the two adjacent anti-parallel β strands connected by a β-turn.


Epiregulin is a member of the epidermal growth factor family. Epiregulin can function as a ligand of epidermal growth factor receptor (EGFR), as well as a ligand of most members of the ERBB (v-erb-b2 oncogene homolog) family of tyrosine-kinase receptors.[2] The secondary structure at the C-terminus epiregulin is different from other epidermal growth factor family ligands because of the lack of hydrogen bonds. The structural difference at the C-terminus may provide an explanation for the reduced binding affinity of epiregulin to the ERBB receptors.[3]


  1. Toyoda H, Komurasaki T, Uchida D, Morimoto S (August 1997). "Distribution of mRNA for human epiregulin, a differentially expressed member of the epidermal growth factor family". Biochem. J. 326 (1): 69–75. PMC 1218638. PMID 9337852.
  2. 2.0 2.1 "Entrez Gene: epiregulin".
  3. 3.0 3.1 3.2 3.3 Sato K, Nakamura T, Mizuguchi M, Miura K, Tada M, Aizawa T, Gomi T, Miyamoto K, Kawano K (October 2003). "Solution structure of epiregulin and the effect of its C-terminal domain for receptor binding affinity". FEBS Lett. 553 (3): 232–8. doi:10.1016/s0014-5793(03)01005-6. PMID 14572630.

Further reading

This article incorporates text from the United States National Library of Medicine, which is in the public domain.