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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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