Abstract
Amino-acid compositional and sequence analyses as well as mass spectrometric determinations of purified rat urine proteins, previously termed prealbumin and α 2-euglobulin, have revealed a high homology between the two forms which have now been identified as α 2-globulin species. The ‘prealbumin’ fraction was found to correspond to α 2u-globulin originating from salivary gland and the ‘ α 2-euglobulin’ fraction was identical with the major urinary protein (MUP) or α 2u-globulin. The results indicate that the two major protein fractions of rat urine constitute different forms of the same parent protein, α 2u-globulin, having no amino-acid sequence resemblance to prealbumin (transthyretin) of rat serum.
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