title: Model studies of 6,7-indolequinone cofactors of quinoprotein amine dehydrogenases.
abstract: The electronic effects of the C-4 substituent on the physicochemical properties and reactivity of the 6,7-inodolequinone cofactors (CTQ and TTQ) have extensively been investigated with use of a series of C-4 substituted 6,7-inodolequinone derivatives (1-4). The one-electron reduction potentials of the 6,7-inodolequinone derivatives decrease with increasing the electron donating ability of the C-4 substituent (with the following order of E degrees': 4>1>2>3). The reaction of indolequinones 1-3 with benzylamine proceeds stepwise through the iminoquinone and the product-imine intermediates to give aminophenol as the final product as the case of TTQ model compound 4. The rate constants of each step have been determined by the detailed kinetic analysis, and the kinetic deuterium isotope effects have also been examined to confirm the rate-determining step. The reactivity of CTQ model compound 1 toward the amines is by one order of magnitude lower than that of TTQ model compound 4. The reactivity of indolequinones 2 and 3 is further decreased due to their stronger electron-donating substituents at C-4. A more important difference between CTQ model compound 1 and TTQ model compound 4 is the reactivity of the iminoquinone intermediate: the reaction of the CTQ model compound with amines stops at the iminoquinone formation stage at room temperature, whereas the reaction of the TTQ model compound with amines proceeds up to the aminophenol formation. Thus, the energy barrier for the rearrangement of the iminoquinone to the product-imine is higher in the CTQ model system than in the TTQ model system.
authors: Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
authors: Yoko
authors: Y
authors: Murakami
authors: Noriyuki
authors: N
authors: Yoshimoto
authors: Nobutaka
authors: N
authors: Fujieda
authors: Kei
authors: K
authors: Ohkubo
authors: Tatsuhiko
authors: T
authors: Hasegawa
authors: Kenji
authors: K
authors: Kano
authors: Shunichi
authors: S
authors: Fukuzumi
authors: Shinobu
authors: S
authors: Itoh
mesh_terms: D000429:Alcohol Oxidoreductases / Q000737:chemistry / Q000378:metabolism*; D000588:Amines / Q000737:chemistry; D000627:Aminophenols / Q000737:chemistry / Q000378:metabolism; D003067:Coenzymes / Q000737:chemistry* / Q000378:metabolism; D018360:Crystallography, X-Ray; D004151:Dipeptides / Q000737:chemistry / Q000378:metabolism; D004563:Electrochemistry / Q000379:methods; D007097:Imines / Q000737:chemistry; D045563:Indolequinones / Q000737:chemistry* / Q000378:metabolism*; D015394:Molecular Structure; D011809:Quinones / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013329:Structure-Activity Relationship; D014364:Tryptophan / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism
chemical_list: D000588:Amines; D000627:Aminophenols; D003067:Coenzymes; D004151:Dipeptides; D007097:Imines; D045563:Indolequinones; D011809:Quinones; C447619:cysteine tryptophylquinone; C116897:iminoquinone; C070569:tryptophan tryptophylquinone; D014364:Tryptophan; D000429:Alcohol Oxidoreductases; C019641:alcohol dehydrogenase (acceptor)