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Expression and characterization of CYP4V2 as a fatty acid omega-hydroxylase

Mariko Nakano1, Edward J Kelly, Allan E Rettie

  • 1Department of Medicinal Chemistry, School of Pharmacy, University of Washington, Seattle, WA 98195-7610, USA.

Drug Metabolism and Disposition: the Biological Fate of Chemicals
|August 8, 2009
PubMed

Insights

Bietti's crystalline dystrophy is linked to the CYP4V2 gene. This study reveals CYP4V2 functions as a specific omega-hydroxylase, suggesting its defect causes this ocular disease.

Area of Science:

  • Biochemistry
  • Genetics
  • Ophthalmology

Background:

  • Bietti's crystalline dystrophy is an inherited ocular disease.
  • Genetic variations in the CYP4V2 gene are strongly associated with this condition.
  • Abnormal lipid metabolism is observed in patients' cells.

Purpose of the Study:

  • To clone and functionally characterize the CYP4V2 gene product.
  • To investigate the enzymatic activity and substrate specificity of CYP4V2.
  • To elucidate the role of CYP4V2 in the pathogenesis of Bietti's crystalline dystrophy.

Main Methods:

  • CYP4V2 gene cloning and expression in a suitable system.
  • Enzymatic assays to determine substrate specificity and catalytic efficiency.
  • Inhibition studies using specific enzyme inhibitors like HET0016.

Main Results:

  • CYP4V2 was identified as a selective omega-hydroxylase for saturated, medium-chain fatty acids.
  • The enzyme exhibits high catalytic efficiency, particularly towards myristic acid.
  • HET0016 was found to be a potent nanomolar inhibitor of CYP4V2 activity.

Conclusions:

  • CYP4V2 possesses unique omega-hydroxylase activity with distinct chain-length selectivity.
  • Defective omega-oxidation of ocular lipids due to CYP4V2 mutations is a likely cause of Bietti's crystalline dystrophy.
  • This research provides a molecular basis for understanding the disease mechanism.

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