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Chromatographic and electrophoretic studies have shown that the subunits of the crystalloid protein, isolated from mature castor bean (Ricinus communis L. cv Hale) seed endosperm protein bodies, are heterogeneous with molecular weights in the range 49 to 53.5 kilodaltons (kD), and are quantitatively in unequal amounts. Each subunit comprises an alphabeta polypeptide pair which are reduced by 2-mercaptoethanol in two subgroups with molecular weights in the 29 to 34 kD and 20.5 to 23.5 kD ranges. Subunits and corresponding polypeptide pairs are also seen to be heterogeneous in pI following isoelectric focusing. In general, large polypeptides are acidic (pI 4.8-6.2) and small polypeptides basic (pI 7.4-9.4), although overlap of some isoelectric isomers does occur, notably in polypeptides derived from subunits which are quantitatively present in smaller amounts.

An Analysis of the Subunit Structure of the Crystalloid Protein Complex from Castor Bean Endosperm