Dehydration of propanediol

Figure 14, Proposed mechanism of the enzymatic dehydration of propanediol...

It was observed that for methylmalonyl-CoA (reaction 6-2), the X group (—COSCoA) is transferred intramolecularly and the hydrogen which is transferred does not exchange with water during the process. The same observation applies for the dehydration of propanediol (reaction 6-4) and the conversion of glutamic acid to methylaspartic acid (reaction 6-1). However,... 

---