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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1990 Mar;87(5):1927–1931. doi: 10.1073/pnas.87.5.1927

Identification of an enzyme in human kidney that correctly processes prorenin.

T Shinagawa 1, Y S Do 1, J D Baxter 1, C Carilli 1, J Schilling 1, W A Hsueh 1
PMCID: PMC53597  PMID: 2408045

Abstract

Using pure recombinant human prorenin as a substrate, we have identified an enzyme in human kidney that accurately processes prorenin to active renin (EC 3.4.23.15). In the crude homogenate, the predominant activity of this potential renin-processing enzyme (RPE) converted the Mr 47,000 inactive prorenin to Mr 44,000 active renin and had a pH optimum of approximately 6. The activity was blocked by cysteine protease inhibitors, but not by pepstatin, EDTA, or serine protease inhibitors. This RPE activity was not detected in a similarly prepared homogenate of human chorion decidua tissue, which produces primarily prorenin, or in human plasma. The activity was purified 100-fold by ammonium sulfate precipitation, p-chloromercuribenzoate affinity chromatography, and chromatofocusing. The partially purified enzyme has a Mr of approximately 27,000 and an isoelectric point in the pH 4.8-5.6 range. The activity in the purified RPE preparation had the same pH optimum as that in crude homogenate, cleaved the prosegment at the same site used by the kidney in vivo based on amino-terminal sequencing of the processed renin, and did not degrade prorenin or renin. These data suggest that the cysteine protease we have isolated is a candidate for authentic renal RPE.

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Selected References

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