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Literature summary extracted from

  • Kanamori, M.; Wixom, R.L.
    Studies in valine biosynthesis. V. Characteristics of the purified dihydroxyacid dehydratase from spinach leaves (1963), J. Biol. Chem., 238, 998-1005.
    View publication on PubMed

General Stability

EC Number General Stability Organism
4.2.1.9 enzyme in crude extract is labile to heat and acid Spinacia oleracea

Inhibitors

EC Number Inhibitors Comment Organism Structure
4.2.1.9 Ag+
-
Spinacia oleracea
4.2.1.9 Cu2+ weak Spinacia oleracea
4.2.1.9 Cys
-
Spinacia oleracea
4.2.1.9 EDTA
-
Spinacia oleracea
4.2.1.9 Hg2+
-
Spinacia oleracea
4.2.1.9 NaF
-
Spinacia oleracea
4.2.1.9 NEM
-
Spinacia oleracea
4.2.1.9 PCMB
-
Spinacia oleracea

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
4.2.1.9 2
-
2,3-dihydroxyisovalerate
-
Spinacia oleracea
4.2.1.9 6.3
-
2,3-dihydroxy-3-methylpentanoate
-
Spinacia oleracea

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
4.2.1.9 mitochondrion
-
Spinacia oleracea 5739
-
4.2.1.9 soluble
-
Spinacia oleracea
-
-

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
4.2.1.9 Co2+ activates Spinacia oleracea
4.2.1.9 Mg2+ required for maximal activity, maximal activity at 0.01 M Spinacia oleracea
4.2.1.9 Mn2+ activates Spinacia oleracea

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
4.2.1.9 2,3-dihydroxy-3-methylpentanoate Spinacia oleracea involved in synthesis of Ile ?
-
?
4.2.1.9 2,3-dihydroxyisovalerate Spinacia oleracea involved in biosynthesis of Val ?
-
?

Organism

EC Number Organism UniProt Comment Textmining
4.2.1.9 Spinacia oleracea
-
-
-

Purification (Commentary)

EC Number Purification (Comment) Organism
4.2.1.9
-
Spinacia oleracea

Source Tissue

EC Number Source Tissue Comment Organism Textmining
4.2.1.9 leaf
-
Spinacia oleracea
-

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
4.2.1.9 2,3-dihydroxy-3-methylbutanoate
-
Spinacia oleracea 2-oxoisovalerate + H2O
-
?
4.2.1.9 2,3-dihydroxy-3-methylpentanoate
-
Spinacia oleracea 3-methyl-2-oxopentanoate + H2O
-
?
4.2.1.9 2,3-dihydroxy-3-methylpentanoate involved in synthesis of Ile Spinacia oleracea ?
-
?
4.2.1.9 2,3-dihydroxyisovalerate involved in biosynthesis of Val Spinacia oleracea ?
-
?

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
4.2.1.9 8 8.2 2,3-dihydroxy-3-methylpentanoate, 2,3-dihydroxyisovalerate Spinacia oleracea