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Related Experiment Videos

Pure Renin. Isolation from hog kidney and characterization.

T Inagami, K Murakami

    The Journal of Biological Chemistry
    |May 10, 1977
    PubMed
    Summary

    Hog kidney renin was purified using affinity chromatography, revealing it as a stable glycoprotein. This pure renin enzyme exhibits broad pH optimum and characterized kinetic properties, crucial for understanding its pressor activity.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Renal Physiology

    Background:

    • Renin (EC 3.4.99.19) is a key pressor enzyme in the renin-angiotensin system.
    • Previous studies reported difficulties in isolating pure and stable renin due to protease activity.
    • Understanding renin's properties is vital for research into blood pressure regulation.

    Purpose of the Study:

    • To isolate pure and stable hog kidney renin.
    • To characterize the biochemical and physical properties of purified renin.
    • To investigate renin's stability and enzyme kinetics.

    Main Methods:

    • Affinity chromatography using pepstatin/agarose gel for initial purification.
    • Additional conventional chromatography steps.
    • Chemical elimination of proteases to prevent enzyme degradation.
    • Characterization techniques including equilibrium ultracentrifugation and enzyme activity assays.

    Main Results:

    • Pure hog kidney renin was successfully isolated and found to be a stable glycoprotein containing glucosamine.
    • The enzyme demonstrated stability at neutral pH (4°C or -20°C for 3-8 weeks), contrary to prior reports.
    • Characterization revealed a molecular weight of 36,400 Da, an isoelectric point of 5.2, and a broad pH optimum (5.5-7.0).

    Conclusions:

    • The developed purification method yields pure, stable hog kidney renin, overcoming previous isolation challenges.
    • The characterized properties, including stability and broad pH optimum, provide a reliable basis for further renin research.
    • This pure renin preparation is suitable for detailed studies of its enzymatic activity and role in the renin-angiotensin system.

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