Isoelectric focusing of rabbit transcobalamin from serum and cerebrospinal fluid

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Abstract
Isoelectric focusing in agarose gel separated rabbit transcobalamin into five to eight isopeptides with isoelectric point (pi) 5.4-6.8. Three different sets of patterns were observed in serum samples from 34 rabbits and in cerebrospinal fluid samples from 10 rabbits as a given pattern in serum corresponded to a given pattern in cerebrospinal fluid. Serum contained higher substance concentrations of acidic isopeptides than cerebrospinal fluid. No correlation was found between the isopeptide patterns and the unsaturated cobalamin-binding capacity. The unsaturated cobalamin-binding capacity of cerebrospinal fluid was high in relation to the protein concentration (0.5-1.3 nmol/1) compared to that of serum (6.6-22.8 nmol/1). The data sμggest synthesis of transcobalamin into the cerebrospinal fluid.