Evidence for acetylated amino-terminal residues in hemocyanins.
The NH2 amino acid terminals of hemocyanin from Carcinus maenas determined by the cyanate and by the dansyl-chloride methods gave very low yields. This gave values for the molecular weight which were abnormally high compared to those determined by physical methods. Assuming that the NH2 terminals are acetylated, the number of acetyl groups (determined spectrofluorimetrically) accounts for all the amino sugars present in hemocyanin and for the NH2 terminals assuming that the molecular weight of the polypeptide chains was 25,000 daltons.
D000595:Amino Acid Sequence; D000818:Animals; D003386:Brachyura; D002855:Chromatography, Thin Layer; D006433:Hemocyanins / Q000032:analysis*; D008970:Molecular Weight; D013050:Spectrometry, Fluorescence
D006433:Hemocyanins