acetoacetyl-CoA → 6-oxocyclohex-1-ene-1-carboxyl-CoA

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Alternative routes for producing a cyclic compound from 3-hydroxypimeloyl-CoA that do not proceed through pimeloyl-CoA are shown in FIG. 3. This route is found in Geobacter metallireducens and Thauera aromatica, among others, in the direction of beta-oxidation. In the route, the biosynthesis of 3-hydroxypimelyl-CoA proceeds from acetoacetyl-CoA, as described above. 3-Hydroxypimeloyl-CoA is dehydrated to form a cyclic product, 6-oxocylohex-1-ene-1-carboxyl-CoA (6-KCH-CoA). 6-KCH-CoA is then converted to cyclohexanone in three enzymatic steps: removal of the CoA moiety, decarboxylation and reduction. With a reversible PEP carboxykinase, this pathway is predicted to achieve a theoretical yield of cyclohexanone (0.75 mol/mol) and is able to achieve an ATP yield of 0.56 mol/mol if a transferase or ATP synthase is utilized in step 2.

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