title: Cysteine reactivity in sorbitol and aldehyde dehydrogenases. Differences towards the pattern in alcohol dehydrogenase.
abstract: In sorbitol dehydrogenase only one cysteine residue, Cys-43, is reactive in both anionic buffer (phosphate) and zinc-liganding buffer (imidazole) upon carboxymethylation. This is in contrast to the situation in the structurally related liver alcohol dehydrogenase, with either of two alternative Cys residues being reactive, and is compatible with differences in zinc-binding and active site relationships between these two metalloenzymes. Unrelated aldehyde dehydrogenase, upon carboxamidomethylation, shows a third pattern, now less well defined but confirming the presence of a thiol function of Cys-302 close to the active site.
authors.affiliation: Department of Chemistry I, Karolinska Institutet, Stockholm, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Johansson
authors.forename: L
authors.initials: L
authors.lastname: Fleetwood
authors.forename: H
authors.initials: H
authors.lastname: Jörnvall
mesh_terms: D000426:Alcohol Dehydrogenase / Q000378:metabolism*; D000444:Aldehyde Dehydrogenase / Q000378:metabolism*; D000818:Animals; D001665:Binding Sites; D003545:Cysteine / Q000378:metabolism*; D007064:L-Iditol 2-Dehydrogenase / Q000037:antagonists & inhibitors / Q000378:metabolism*; D012756:Sheep
chemical_list: D000426:Alcohol Dehydrogenase; D007064:L-Iditol 2-Dehydrogenase; D000444:Aldehyde Dehydrogenase; D003545:Cysteine