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Related Experiment Videos

[Function of angiotensin-converting enzyme on matrices].

N A Lamzina, O A Kost, K V Piotukh

    Biokhimiia (Moscow, Russia)
    |October 1, 1990
    PubMed
    Summary

    Immobilizing bovine lung angiotensin-converting enzyme on Sepharose matrices alters its microenvironment. This interaction enhances substrate hydrolysis and modifies chloride ion activation, shifting optimal concentrations.

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    Biochemistry. Biokhimiia·2011

    Area of Science:

    • Biochemistry
    • Enzymology
    • Protein Chemistry

    Context:

    • Angiotensin-converting enzyme (ACE) plays a crucial role in the renin-angiotensin system.
    • Enzyme immobilization is a common technique to study enzyme properties and improve stability.
    • Understanding ACE microenvironment modulation is key to its physiological function.

    Purpose:

    • To investigate the effect of immobilizing bovine lung angiotensin-converting enzyme (ACE) on different Sepharose matrices.
    • To determine how enzyme binding to carbohydrate matrices influences its catalytic activity and substrate hydrolysis.
    • To analyze the impact of immobilization on ACE activation by chloride ions.

    Summary:

    • Bovine lung ACE was immobilized on BrCN-activated Sepharose, CH-Sepharose, and AH-Sepharose, including binding via the carbohydrate fragment.

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  • Immobilization on these matrices modulated the enzyme's microenvironment, leading to increased catalytic constants for certain substrates.
  • The binding significantly altered ACE activation by chloride ions, shifting optimal activator concentrations to lower values.

    • Impact:

    • This study provides insights into how the enzyme's local environment affects its catalytic efficiency and regulatory properties.
    • Findings suggest that ACE immobilization can be used to fine-tune its activity and response to activators.
    • The research contributes to a better understanding of ACE function in biological systems and potential applications in biotechnology.