Vitamin C is the co-enzyme for the following hydroxylases EXCEPT
-Vitamin C plays the role of a coenzyme in hydroxylation of proline and lysine while protocollagen is converted to collagen  (i.e.  post-translational modification). The hydroxylation reaction is catalysed by lysyl hydroxylase  (for  lysine)  and prolyl  hydroxylase (for  proline).
-Hydroxylation of  glycine  is  carried  out  by peptidylglycine  hydroxylase which  requires vitamin C.
-Ascorbic acid  is required  for  the  oxidation  of  p-hydroxy phenylpyruvate (enzyme hydroxylase) to homogentisic acid in tyrosine metabolism.
Peptidyl glycine hydroxylase
Dopamine betahydroxylase
Prolyl/ lysyl hydroxylase
Aspartate betahydroxylase