Results presented here and in a previous paper (Tanabe et al. (1979) Biochemistry 18, 3401-3406) indicate that mouse β-polymerase is a single polypeptide with an apparent molecular weight of 40,000. This polypeptide has now been analyzed by tryptic peptide mapping. comparison of the results with identical analysis of mouse α-polymerase reveals that the tryptic peptides derived from the two enzymes are different. These results indicate that β-polymerase is neither a subunit of α-polymerase nor a proteolytic degradation product of α-polymerase.
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