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Related Experiment Videos

Discrimination between closed and open forms of lipases using electrophoretic techniques.

N Miled1, M Riviere, J F Cavalier

  • 1UPR 9025 du CNRS, Laboratoire de Lipolyse Enzymatique, 31 Chemin Joseph-Aiguier, 13402 Marseille Cedex 20, France.

Analytical Biochemistry
|March 5, 2005
PubMed
Summary

Lipase inhibition causes structural changes, shifting them from closed to open forms. Electrophoretic analysis can easily distinguish between these closed (native) and open (inhibited) lipase conformations.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Enzyme activity, particularly catalytic activity of lipases, is often linked to structural conformation changes.
  • Covalently inhibited lipases adopt open conformations, differing from their native closed forms.

Purpose of the Study:

  • To investigate the structural and electrostatic differences between native (closed) and inhibited (open) conformations of various lipases.
  • To explore the utility of electrophoretic mobility and isoelectric point analysis for differentiating lipase conformations.

Main Methods:

  • Studied the inhibition of human gastric lipase, dog gastric lipase, human pancreatic lipase, and Humicola lanuginosa lipase using an octyl-undecyl phosphonate inhibitor.
  • Measured electrophoretic mobility and determined isoelectric points (pI) for both native (closed) and inhibited (open) lipase forms.

Related Experiment Videos

  • Compared experimental pI values with theoretical calculations based on electrostatic potential.

    • Main Results:

    • Inhibited lipases consistently exhibited open conformations, while native lipases were in closed conformations.
    • Significant differences in isoelectric points were observed between the closed (native) and open (inhibited) states for all four lipases studied.
    • Experimental pI values correlated well with theoretical electrostatic potential calculations.

    Conclusions:

    • Lipase inhibition induces a conformational transition from closed to open states.
    • Electrophoretic pattern analysis provides a straightforward method for distinguishing between closed and open lipase forms.
    • Isoelectric point differences are a key indicator of conformational changes in lipases.