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

Eukaryotic initiation factor 4D. Purification from human red blood cells and the sequence of amino acids around its single hypusine residue.

Eukaryotic initiation factor 4D (eIF-4D) was purified from human red blood cells by a simple 5-step procedure. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that most of the preparations of eIF-4D were composed of variable amounts of two closely migrating forms of the factor, each of which contained a single residue of the unique amino acid hypusine. The structural similarity of the two forms of human eIF-4D was evidenced by the indistinguishable patterns of radioactivity on peptide maps of tryptic digests prepared from radioiodinated samples. A peptide containing the single hypusine residue was readily isolated from a tryptic digest of human eIF-4D by virtue of its high positive charge and hydrophilic character. Amino acid sequence determination on this peptide revealed the following primary structure around hypusine: Thr-Gly-hypusine-His-Gly-His-Ala-Lys.[1]


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