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Rat urinary renin was purified by a procedure involving ammonium sulfate fractionation, pepstatin-aminohexyl-Sepharose 4B chromatography, ion exchange chromatography and gel filtration. The resulting preparation was essentially homogeneous, as assessed by polyacrylamide gel electrophoresis. The molecular weight of the preparation was estimated to be 39000 by SDS-gel electrophoresis and 40000 by gel filtration. The optimum pH determined with rat angiotensinogen was 7.0, and the Km was 3.6 microM. These properties agreed well with those of purified rat renal renin. The activity of urinary renin was specifically inhibited by anti-renin antibody. These results suggest that urinary renin may originate in the kidney.
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