1.1.1.86: ketol-acid reductoisomerase (NADP+)

This is an abbreviated version, for detailed information about ketol-acid reductoisomerase (NADP+), go to the full flat file.

Reaction

(2R)-2,3-dihydroxy-3-methylbutanoate
+
NADP+
=
(2S)-2-hydroxy-2-methyl-3-oxobutanoate
+
NADPH
+
H+

Synonyms

2-hydroxy-3-keto acid reductoisomerase, acetohydroxy acid isomeroreductase, acetohydroxy acid reductoisomerase, acetohydroxy-acid isomeroreductase , acetohydroxy-acid reductoisomerase , acetohydroxyacid isomeroreductase, acetolactate reductoisomerase, AHAIR, AHIR, alpha-keto-beta-hydroxylacil reductoisomerase, alpha-keto-beta-hydroxylacyl reductoisomerase, class II ketol-acid reductoisomerase, dehydrogenase, dihydroxyisovalerate (isomerizing), dihydroxyisovalerate dehydrogenase (isomerizing), Icl1p, Ilv5p, ilvC, IlvC-PanE, IlvC1, IlvC2, isomerase, ketol acid reducto-, isomeroreductase, KARI, ketol-acid reductoisomerase, reductoisomerase

ECTree

     1 Oxidoreductases
         1.1 Acting on the CH-OH group of donors
             1.1.1 With NAD+ or NADP+ as acceptor
                1.1.1.86 ketol-acid reductoisomerase (NADP+)

Crystallization

Crystallization on EC 1.1.1.86 - ketol-acid reductoisomerase (NADP+)

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Crystallization/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
hanging drop vapor diffusion method, using 1 M sodium potassium tartrate, 200 mM sodium chloride, 100 mM imidazole pH 8.0
-
hanging drop vapor diffusion method, using 0.25 M NaCl, 28% (w/v) polyethylene glycol 3350 and 0.1 M bis-Tris, pH 5.5
in complex with Mg2+ and NADPH at 2.3 A resolution. The binding of Mg2+ increases structural disorder while the binding of NADPH increases the structural rigidity of the enzyme. The binding of Mg2+ and NADPH opens the interface between the N- and C-domains, thereby allowing access for the substrates to bind
purified recombinant His-tagged enzyme, 9 mg/ml protein in 20 mM sodium HEPES, pH 7.5, and NADPH in a ratio of 10 mol NADPH per mol of enzyme, hanging drop vapour diffusion method, equal volumes of 0.003 ml of protein and reservoir solution, the latter containing 1.6 M ammonium sulfate, and 0.1 M sodium bicine, pH 9.0, 17C, 6 months, X-ray diffraction structure determination and analysis at 2.6 A resolution
-
the enzyme is remarkably easy to crystallize
-
hanging drop vapor diffusion method, using 0.1 M bis-Tris, pH 6.0, 22% (w/v) polyethylene glycol monomethylether 5000; in complex with NADPH and the transition state analogue N-isopropyloxamate and apo-form. The enzyme has a seven-residue specificity loop
native enzyme with two magnesium ions bound in the active site, hanging drop vapor diffusion method, using 250 mM MgCl2, 20% (w/v) PEG 3350, 100 mM Tris/HCl, pH 8.0
enzyme KARI in complex with Mg2+ or with Mg2+ and NADPH, hanging-drop method by vaporphase diffusion at 18C, 0.003 ml of protein solution containing 6 mg/ml enzyme, 50 mM Hepes, pH 7.5, 5 mM NADPH, and 5 mM MgCl2, is mixed with 0.001 ml of reservoir solution containing 0.2 M magnesium chloride hexahydrate, 0.1 M Tris-HCl, pH 8.5, and 15% w/v PEG 4000, a few days to 3 months, X-ray diffraction structure determination and analysis at 1.55 A and 2.80 A resolution, respectively, molecular replacement
-
The dodecamer architecture of 23 point group symmetry is assembly of six dimeric units and dimerization is essential for the formation of the active site
-
X-ray, structure analysis
-
ammonium sulfate precipitation, crystal structure of the enzyme complexed with NADPH, two magnesium ions and N-hydroxy-N-isopropyloxamate, a herbicidal transition state analog determined at 1.65 A resolution, recombinant enzyme overexpressed in Escherichia coli
-
crystallized with 2-aceto-2-hydroxybutanoate, Mn2+ and NADPH
-
hanging drop vapor diffusion method, using 0.1 M bis-Tris, pH 5.0, 20% (w/v) w/v polyethylene glycol 1500