Alpha oxidation


Pathway

Alpha-oxidation of phytanic acid is believed to take place entirely within peroxisomes.

  • Phytanic acid is first attached to CoA to form phytanoyl-CoA.
  • Phytanoyl-CoA is oxidized by phytanoyl-CoA dioxygenase, in a process using Fe2+ and O2, to yield 2-hydroxyphytanoyl-CoA.
  • 2-hydroxyphytanoyl-CoA is cleaved by 2-hydroxyphytanoyl-CoA lyase in a TPP-dependent reaction to form pristanal and formyl-CoA (in turn later broken down into formate and eventually CO2).
  • Pristanal is oxidized by aldehyde dehydrogenase to form pristanic acid (which can then undergo beta-oxidation).

    • (Propionyl-CoA is released as a result of beta oxidation when the beta carbon is substituted)

    Deficiency

    Enzymatic deficiency in alpha-oxidation (most frequently in phytanoyl-CoA dioxygenase) leads to Refsum's disease, in which the accumulation of phytanic acid and its derivatives leads to neurological damage. Other disorders of peroxisome biogenesis also prevent alpha-oxidation from occurring.

    References

  • , Patti A.; Eaton Simon, eds. (1999), Current views of fatty acid oxidation and ketogenesis : from organelles to point mutations 466 (2nd ed.), New York, NY: Kluwer Acad./Plenum Publ., pp. 292–295, ISBN 0-306-46200-1 
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Alpha_oxidation

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