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Literature summary for 1.1.1.85 extracted from

  • Nango, E.; Yamamoto, T.; Kumasaka, T.; Eguchi, T.
    Crystal structure of 3-isopropylmalate dehydrogenase in complex with NAD(+) and a designed inhibitor (2009), Bioorg. Med. Chem., 17, 7789-7794.
    View publication on PubMed

Crystallization (Commentary)

Crystallization (Comment) Organism
crystal structure of Thermus thermophilus IPMDH in a ternary complex with NAD+ and the inhibitor ((2S,3S)-3-methylmercaptomalate) is determined at 2.8 A resolution. The inhibitor exists as a decarboxylated product with an enol/enolate form in the active site. The product interacts with Arg94, Asn102, Ser259, Glu270, and a water molecule hydrogen-bonding with Arg132. All interactions between the product and the enzyme are observed in the position associated with keto-enol tautomerization Thermus thermophilus

Inhibitors

Inhibitors Comment Organism Structure
(2S,3S)-3-methylmercaptomalate strong competitive inhibitor Thermus thermophilus

Metals/Ions

Metals/Ions Comment Organism Structure
Mg2+
-
Thermus thermophilus

Organism

Organism UniProt Comment Textmining
Thermus thermophilus Q5SIY4
-
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
(2R,3S)-3-isopropylmalate + NAD+
-
Thermus thermophilus (2S)-2-isopropyl-3-oxosuccinate + NADH + H+
-
?

Synonyms

Synonyms Comment Organism
3-isopropylmalate dehydrogenase
-
Thermus thermophilus
IPMDH
-
Thermus thermophilus

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
60
-
assay at Thermus thermophilus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7.8
-
assay at Thermus thermophilus

Cofactor

Cofactor Comment Organism Structure
NADH
-
Thermus thermophilus

Ki Value [mM]

Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
0.000062
-
(2S,3S)-3-methylmercaptomalate pH 7.8, 60°C Thermus thermophilus