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Lens neutral endopeptidase (EC 3.4.24.5) was previously thought to be unique to the eye lens. We report here the finding of a neutral endopeptidase, in a variety of bovine and human tissues, which is very similar both biochemically and immunologically to the lens endopeptidase. SDS/polyacrylamide-gel electrophoresis of partially purified enzyme fractions from various bovine tissues shows the characteristic pattern of at least eight bands with Mr values ranging from 24,000 to 32,000 which was described for the bovine-lens neutral endopeptidase. The relative activity of the enzyme varies from tissue to tissue with lung having the highest activity. Partially purified enzyme fractions from these tissues cross-react with antiserum raised in rabbit against bovine lens endopeptidase showing apparent identity when examined side by side in Ouchterlony double-diffusion tests. The human enzyme also cross-reacts with the antiserum but when tested by double-diffusion against the bovine enzyme the precipitin lines show spurring at the joining edges indicating a structural difference between the human and the bovine enzymes. It was also found by Western blot experiments, after denaturing polyacrylamide-gel electrophoresis of the enzyme, that the polypeptide components of the human and bovine enzymes show somewhat different banding patterns.

Lens neutral endopeptidase occurs in other bovine and human tissues