Active site structure of methylamine dehydrogenase: hydrazines identify C6 as the reactive site of the tryptophan-derived quinone cofactor.Huizinga, E.G., van Zanten, B.A., Duine, J.A., Jongejan, J.A., Huitema, F., Wilson, K.S., Hol, W.G.
(1992) Biochemistry 31: 9789-9795
- PubMed: 1390754
- Primary Citation of Related Structures:
- PubMed Abstract:
- Purification, Crystallization and Preliminary X-Ray Investigation of Quinoprotein Methylamine Dehydrogenase from Thiobacillius Versutus
Vellieux, F.M.D.,Frank, J.,Swarte, M.B.A.,Groendijk, H.,Duine, J.A.,Drenth, J.,Hol, W.G.J.
(1986) Eur.J.Biochem. 154: 383
- Crystallographic Investigations of the Tryptophan-Derived Cofactor in the Quinoprotein Methylamine Dehydrogenase
Chen, L.,Mathews, F.S.,Davidson, V.L.,Huizinga, E.G.,Vellieux, F.M.D.,Duine, J.A.,Hol, W.G.J.
(1991) FEBS Lett. 287: 163
- Structure of Quinoprotein Methylamine Dehydrogenase at 2.25 Angstroms Resolution
Vellieux, F.M.D.,Huitema, F.,Groendijk, H.,Kalk, K.H.,Frank, J.,Jongejan, J.A.,Duine, J.A.,Petratos, K.,Drenth, J.,Hol, W.G.J.
(1989) Embo J. 8: 2171
To identify the reactive part of the orthoquinone function of the tryptophan-derived cofactor found in methylamine dehydrogenase (MADH), we have determined the crystal structures of MADH from Thiobacillus versutus inhibited by methylhydrazine and (2, ...
To identify the reactive part of the orthoquinone function of the tryptophan-derived cofactor found in methylamine dehydrogenase (MADH), we have determined the crystal structures of MADH from Thiobacillus versutus inhibited by methylhydrazine and (2,2,2-trifluoroethyl)hydrazine. Extra electron density attached to C6 of the tryptophyl tryptophanquinone cofactor shows that this atom and not C7 is the reactive part of the ortho-quinone moiety. The density retained after hydrazine inhibition is much less extensive than expected, however, suggesting that partial breakdown of the inhibitors after reaction with the cofactor may take place. A detailed description is presented of the cofactor environment in an improved model of MADH which now includes information from the recently determined gene sequence of the cofactor-containing subunit [Ubbink, M., van Kleef, M.A.G., Kleinjan, D., Hoitink, C.W.G., Huitema, F., Beintema, J.J., Duine, J.A., & Canters, G.W. (1991) Eur. J. Biochem. 202, 1003-1012]. We hypothesize that Asp76 is responsible for proton abstraction from the alpha-carbon of the substrate during catalysis.
Department of Chemistry, Groningen University, The Netherlands.