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Literature summary for 3.1.8.2 extracted from

  • Blum, M.M.; Loehr, F.; Richardt, A.; Rueterjans, H.; Chen, J.C.
    Binding of a designed substrate analogue to diisopropyl fluorophosphatase: implications for the phosphotriesterase mechanism (2006), J. Am. Chem. Soc., 128, 12750-12757.
    View publication on PubMed

Crystallization (Commentary)

Crystallization (Comment) Organism
in complex with inhibitor O,O-dicyclopentylphosphoroamidate. Phosphoryl oxygen of inhibitor is directly coordinated to the catalytic calcium ion Loligo vulgaris

Protein Variants

Protein Variants Comment Organism
D229N/N120D catalytically inactive, no change in the calcium coordinating environment Loligo vulgaris
D229N/N175D catalytically inactive, no change in the calcium coordinating environment Loligo vulgaris
E21Q/N120D catalytically inactive Loligo vulgaris
E21Q/N175D catalytically inactive Loligo vulgaris

Inhibitors

Inhibitors Comment Organism Structure
O,O-dicyclopentylphosphoroamidate crystallization data, phosphoryl oxygen of inhibitor is directly coordinated to the catalytic calcium ion Loligo vulgaris

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
2.72
-
diisopropyl fluorophosphate wild-type, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris
23.36
-
diisopropyl fluorophosphate wild-type, presence of 1 mM O,O-dicyclopentylphosphoroamidate, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris
65.45
-
diisopropyl fluorophosphate wild-type, presence of 3 mM O,O-dicyclopentylphosphoroamidate, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris

Organism

Organism UniProt Comment Textmining
Loligo vulgaris Q7SIG4
-
-

Reaction

Reaction Comment Organism Reaction ID
diisopropyl fluorophosphate + H2O = diisopropyl phosphate + fluoride calcium coordinating residue D229, in concert with direct substrate activation by the metal ion, renders the phosphorus atom of the substrate susceptible for attack of water, through generation of a phosphoenzyme intermediate Loligo vulgaris

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
diisopropyl fluorophosphate + H2O
-
Loligo vulgaris diisopropyl phosphate + fluoride
-
?

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
2091
-
diisopropyl fluorophosphate wild-type, presence of 3 mM O,O-dicyclopentylphosphoroamidate, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris
2107
-
diisopropyl fluorophosphate wild-type, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris
2111
-
diisopropyl fluorophosphate wild-type, presence of 1 mM O,O-dicyclopentylphosphoroamidate, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris

Ki Value [mM]

Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
0.125
-
O,O-dicyclopentylphosphoroamidate wild-type, pH 7.5, 25┬░C, in nitrogen atmosphere Loligo vulgaris