Abstract
The molecular architecture of the Class II E. coli fructose 1,6-bisphosphate aldolase dimer was determined to 1.6 Å resolution. The subunit fold corresponds to a singly wound α/β-barrel with an active site located on the β-barrel carboxyl side of each subunit. In each subunit there are two mutually exclusive zinc metal ion binding sites, 3.2 Å apart; the exclusivity is mediated by a conformational transition involving side-chain rotations by chelating histidine residues. A binding site for K+ and NH4+ activators was found near the β-barrel centre. Although Class I and Class II aldolases catalyse identical reactions, their active sites do not share common amino acid residues, are structurally dissimilar, and from sequence comparisons appear to be evolutionary distinct.
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Blom, N., Tétreault, S., Coulombe, R. et al. Novel active site in Escherichia coli fructose 1,6-bisphosphate aldolase. Nat Struct Mol Biol 3, 856–862 (1996). https://doi.org/10.1038/nsb1096-856
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DOI: https://doi.org/10.1038/nsb1096-856
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