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The main aim of this thesis work was to elucidate the catalytic mechanism of several enzyme complexes on the basis of their three-dimensional structure. All investigated enzyme complexes occur in the anaerobic energy metabolism and have an essential function by the challenging degradation of aromatic compounds and the flavin-based electron bifurcation (FBEB)/confurcation, an energy-coupling mechanism. More specifically, I studied the phthaloyl-CoA decarboxylase of Thauera chlorobenzoica (Pcd) involved in phthalate ester decomposition, the FBEB protein complexes lactate dehydrogenase/electron-transfer flavoprotein (Ldh/EtfAB) of Acetobacterium woodii, the heterodisulfide-related subunit HdrA of the sulfur- oxidizing bacteria Hyphomicrobium denitrificans (sHdrA). In addition, I contributed to the structure determination of the caffeyl-CoA reductase- EtfAB complex of A. woodii and the naphthoyl-CoA reductase of the sulfate-respiring enrichment culture N47 (mentioned in the Appendix E and F).