title: Archaeal aldehyde dehydrogenase ST0064 from Sulfolobus tokodaii, a paralog of non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase, is a succinate semialdehyde dehydrogenase.
abstract: Aldehyde dehydrogenase ST0064, the closest paralog of previously characterized allosteric non-phosphorylating glyceraldehyde-3-phosphate (GAP) dehydrogenase (GAPN, ST2477) from a thermoacidophilic archaeon, Sulfolobus tokodaii, was expressed heterologously and characterized in detail. ST0064 showed remarkable activity toward succinate semialdehyde (SSA) (Km of 0.0029 mM and kcat of 30.0 s(-1)) with no allosteric regulation. Activity toward GAP was lower (Km of 4.6 mM and kcat of 4.77 s(-1)), and previously predicted succinyl-CoA reductase activity was not detected, suggesting that the enzyme functions practically as succinate semialdehyde dehydrogenase (SSADH). Phylogenetic analysis indicated that archaeal SSADHs and GAPNs are closely related within the aldehyde dehydrogenase superfamily, suggesting that they are of the same origin.
authors.affiliation: Department of Biotechnology, The University of Tokyo, Tokyo, Japan.
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Ito
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Chishiki
authors.forename: Shinya
authors.initials: S
authors.lastname: Fushinobu
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Wakagi
mesh_terms: D000214:Acyl Coenzyme A / Q000235:genetics / Q000378:metabolism; D000444:Aldehyde Dehydrogenase / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D024581:Glyceraldehyde-3-Phosphate Dehydrogenase (Phosphorylating) / Q000235:genetics / Q000378:metabolism*; D007700:Kinetics; D010802:Phylogeny; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D050644:Succinate-Semialdehyde Dehydrogenase / Q000235:genetics* / Q000378:metabolism; D016944:Sulfolobus / Q000201:enzymology*
chemical_list: D000214:Acyl Coenzyme A; C012046:succinyl-coenzyme A; D024581:Glyceraldehyde-3-Phosphate Dehydrogenase (Phosphorylating); D050644:Succinate-Semialdehyde Dehydrogenase; D000444:Aldehyde Dehydrogenase