Alpha oxidation

Enzymatic steps of alpha oxidation


Pathway

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

  1. Phytanic acid is first attached to CoA to form phytanoyl-CoA.
  2. Phytanoyl-CoA is oxidized by phytanoyl-CoA dioxygenase, in a process using Fe2+ and O2, to yield 2-hydroxyphytanoyl-CoA.
  3. 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).
  4. 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 hydroxylase) 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.

gollark: * yür
gollark: 1, 2, 3, 4, 7, 8, 9, 0 and derivatives.
gollark: 3 is not permissible.
gollark: On each diagram show clearly the coordinates of the maximum and minimum points.The graph of y = f(x) + a has a minimum at (3, 0), where a is a constant. you.
gollark: Quarantine initiated. None are safe.

References
  1. , 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
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.