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J. Biol. Chem., Vol. 255, Issue 8, 3498-3502, Apr, 1980

Human renal renin. Complete purification and characterization

H Yokosawa, LA Holladay, T Inagami, E Haas and K Murakami

Complete purification of human renin from noncancerous, autopsied kidneys is reported. A 480,000-fold purification was achieved to yield renin with a specific activity of 950 Goldblatt units/mg. This preparation satisfied multiple criteria of purity as tested by polyacrylamide gel electrophoresis, isoelectric focusing, specific activity, analytical ultracentrifugation, and immunodouble diffusion. The molecular weight of the pure enzyme determined by sedimentation equilibrium is 40,000. The apparent molecular weight estimated by gel filtration is 41,000. The enzyme has an isoelectric point of pH 5.7. Human renin shows an affinity for concanavalin A, suggesting the presence of carbohydrates. These properties and the amino acid composition of human renin are different from those of renin obtained from other mammalian species. Human renin antibodies prepared with the pure enzyme preparation showed negligible cross-reactivity with renin from other mammalian species. The activity with homologous human renin substrate has a pH optimum of 6, whereas with substrates from other mammalian species the optima were in higher or lower pH ranges.
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