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Elongation factor 2. Amino acid sequence at the site of adenosine diphosphate ribosylation.

Abstract Tryptic digestion of [14C]ADP-ribosylated elongation factor 2 (EF-2), purified from rat liver, yielded a single radioactive peptide. The pure peptide (62% yield) consists of 15 amino acid residues whose sequence is Phe-Asp-Val-His-Asp-Val-Thr-Leu-His-Ala-Asp-Ala-Ile-X-Arg; the ADP ribose is linked to the unknown residue, X. X is a weakly basic residue which does not correspond to any amino acid commonly occurring in proteins but which is present in unmodified EF-2, possibly to the extent of only 1 residue per mole of EF-2.