Function 
Mandelate racemase/muconate lactonizing enzyme (MRMLP) is an enolase family dipeptide epimerase.  Other members of th family are D-mannonate dehydratase, L-talarate dehydratase, L-rhamnonate dehydratase, D-glucarate dehydratase, Galacturonate dehydratase, Tartarate dehydratase, L-fuconate dehydratase and N-succinyl Arg/Lys racemate.  The D-mannonate dehydratase catalyzes the syn-hydration of D-mannonate.
  Structural highlights 
The D-mannonate dehydratase has : the  and a . The  of the enzyme is found between these two domains[1]. Water molecules are shown as red spheres. .