Wright K A, Cain R B
Biochem J. 1972 Jul;128(3):561-8. doi: 10.1042/bj1280561.
Extracts of Achromobacter D formed CO(2), methylamine, succinate and formate as metabolic end-products from N-methylisonicotinic acid (4-carboxy-1-methylpyridinium chloride). The origin of the CO(2) in the 4-carboxyl group and of the methylamine in the N-methyl group of N-methylisonicotinate was demonstrated with carboxyl-(14)C- and N-Me-(14)C-labelled substrates respectively. The carbon skeletons of formate and succinate were shown to arise from the C-2 and the C-3-C-6 atoms of the heterocyclic ring respectively by using N-methyl[2,3-(14)C(2)]isonicotinate. This result is consistent with ring cleavage by the organism between C-2 and C-3.
无色杆菌D的提取物将N-甲基异烟酸(4-羧基-1-甲基吡啶鎓氯化物)代谢生成二氧化碳、甲胺、琥珀酸和甲酸作为代谢终产物。分别用羧基-(14)C和N-甲基-(14)C标记的底物证明了N-甲基异烟酸酯4-羧基中的二氧化碳和N-甲基中的甲胺的来源。通过使用N-甲基[2,3-(14)C₂]异烟酸酯,表明甲酸和琥珀酸的碳骨架分别来自杂环的C-2和C-3-C-6原子。该结果与该生物体在C-2和C-3之间的环裂解一致。