Suggested inositol catabolic pathway in S. meliloti. Compounds: [I], d-chiro-inositol; [II], myo-inositol; [III], scyllo-inositol; [IV], 2-keto-myo-inositol; [V], 3-d-(3,4/5)-trihydroxycyclohexane-1,2-dione; [VI], 5-deoxy glucuronic acid; [VII] 2-deoxy-5-keto-d-gluconic acid; [VIII] 2-deoxy-5-keto-d-gluconic acid 6-phosphate; [IX] dihydroxyacetone phosphate; [X], malonate semialdehyde (MSA); [XI], acetyl coenzyme A. Enzymes: IdhA, myo-inositol dehydrogenase; IolY, scyllo-inositol dehydrogenase; IolE, 2KMI dehydratase; IolD, 3-d-(3,5/4)-trihydroxycyclohexane-1,2-dione hydrolase; IolB, 5-deoxy-glucuronate isomerase; IolC, 2-deoxy-5-keto-d-gluconic acid kinase; IolA (MmsA), methylmalonate semialdehyde dehydrogenase.