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Mitochondrial creatine kinase interaction with phospholipid vesicles

M J Vacheron1, E Clottes, C Chautard

  • 1UPRESA 5013 CNRS-LYON I Biomembranes et Enzymes Associés, Université Claude Bernard Lyon I, Villeurbanne, France. Vacheron@univ-lyon1.fr

Archives of Biochemistry and Biophysics
|August 15, 1997
PubMed
Summary

Mitochondrial creatine kinase (mt-CK) binds to negatively charged phospholipid vesicles through electrostatic interactions. This binding is influenced by pH and ionic strength, and can be disrupted by certain compounds like adriamycin.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biophysics

Background:

  • Mitochondrial creatine kinase (mt-CK) is crucial for cellular energy buffering.
  • Understanding mt-CK's interaction with membranes is key to its function and regulation.

Purpose of the Study:

  • To characterize the interaction between mt-CK and phospholipid vesicles.
  • To investigate the electrostatic nature and factors influencing mt-CK binding to membranes.

Main Methods:

  • Liposome binding assays were used to study mt-CK interaction.
  • Varying phospholipid charge, ionic strength, and pH were employed.
  • Differential scanning calorimetry (DSC) analyzed membrane perturbation.

Main Results:

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  • Significant mt-CK binding requires negatively charged phospholipids.
  • Binding is electrostatic, sensitive to ionic strength and pH.
  • Adriamycin and parahydroxymercuribenzoate affect mt-CK binding; ATP/ADP do not.
  • mt-CK induces vesicle aggregation and partial phospholipid bilayer disorganization.

Conclusions:

  • mt-CK interaction with membranes is primarily electrostatic.
  • Specific effectors modulate mt-CK membrane association.
  • mt-CK binding leads to membrane structural changes, impacting function.