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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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beta-Hydroxyaspartic acid or beta-hydroxyasparagine in bovine low density lipoprotein receptor and in bovine thrombomodulin.

All of the vitamin K-dependent plasma proteins with domains that are homologous to the epidermal growth factor ( EGF) precursor have 1 hydroxylated aspartic acid residue in the NH2-terminal EGF-homology region. In addition, protein S has 1 hydroxylated asparagine residue in each of the three COOH-terminal EGF-homology regions. All of these proteins have been found to have the amino acid sequence, CX(D or N)XXXX(F or Y)XCXC (corresponding to residues 20 to 33 in EGF), where the Asp or Asn residue is hydroxylated. This sequence also appears in two of the three EGF-homology regions of the human low density lipoprotein receptor and in two of the six EGF-homology regions of bovine thrombomodulin so far identified, suggesting that they may have the modified amino acid. We have now identified beta-hydroxyaspartic acid in acid hydrolysates of both these proteins.[1]

References

  1. beta-Hydroxyaspartic acid or beta-hydroxyasparagine in bovine low density lipoprotein receptor and in bovine thrombomodulin. Stenflo, J., Ohlin, A.K., Owen, W.G., Schneider, W.J. J. Biol. Chem. (1988) [Pubmed]
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