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The relation between ARK and HSD shadirjb 09/01/06
    I have a question about enzymes please.
    I read it in several sources that HSDs, (Hydroxysteroid Dehydrogenases) are a family of ARKs (Aldo-keto Reductases).
    This makes no sense to me because a dehydrogenase is an enzyme that catalyzes the removal of hydrogen from a substrate, and therefore oxidizes it, while an ARK is an enzyme that catalyzes the addition of hydrogen to a keton carbon-oxygen bond and therefore its reduction.
    How can these be within the same family?

      Clarification/Follow-up by Toms777 on 09/02/06 11:43 am:
      This may not be the best board for an answer to that question. You may want to try posting this to the chemistry board here:

      Answerway - Chemistry

 
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