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Immunochemical Comparison of -Lactoglobulins

Department of Biochemistry, University of Minnesota, St. Paul, Minnesota and Eastern Utilization Research and Development Division, United States Department of Agriculture, Philadelphia, Pennsylvania

Abstract

The genetic variants of cow -lactoglobulin are indistinguishable by Ouchterlony double diffusion and the quantitative precipitin test. They are distinguishable from each other by complement and micro-complement fixation tests.

Goat and sheep -lactoglobulins are identical to the cow -lactoglobulin variants by the Ouchterlony test, but are distinguishable by quantitative precipitation, complement and micro-complement fixation.

Chemical modification of cow -lactoglobulin, such as cleavage of the -His-Ile C-terminal sequence of the B variant, crystallization of the A variant with 2 moles of SDS and blocking of the -SH groups of the B variant with DTNB, do not produce molecules which are immunologically distinguishable from the parent molecule.

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