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Literature summary for 2.2.1.6 extracted from

  • Ochogavia, A.C.; Breccia, G.; Vega, T.; Felitti, S.A.; Picardi, L.A.; Nestares, G.
    Acetohydroxyacid synthase activity and transcripts profiling reveal tissue-specific regulation of ahas genes in sunflower (2014), Plant Sci., 224, 144-150.
    View publication on PubMed

Cloned(Commentary)

Cloned (Comment) Organism
gene ahas1 encoding the AHAS catalytic subunit, DNA and amino acid sequence determination and analysis, expression pattern of ahas genes family in sunflower Helianthus annuus
gene ahas2 encoding the AHAS catalytic subunit, DNA and amino acid sequence determination and analysis, expression pattern of ahas genes family in sunflower Helianthus annuus
gene ahas3 encoding the AHAS catalytic subunit, DNA and amino acid sequence determination and analysis, expression pattern of ahas genes family in sunflower Helianthus annuus

Metals/Ions

Metals/Ions Comment Organism Structure
Mg2+ required Helianthus annuus

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2 pyruvate Helianthus annuus
-
2-acetolactate + CO2
-
?
2 pyruvate Helianthus annuus HA89
-
2-acetolactate + CO2
-
?
pyruvate + 2-oxobutyrate Helianthus annuus
-
2-aceto-2-hydroxybutyrate + CO2
-
?
pyruvate + 2-oxobutyrate Helianthus annuus HA89
-
2-aceto-2-hydroxybutyrate + CO2
-
?

Organism

Organism UniProt Comment Textmining
Helianthus annuus
-
inbred line HA89
-
Helianthus annuus Q5VB42 isozyme AHAS3; gene ahas3 encoding the AHAS catalytic subunit
-
Helianthus annuus Q5VB44 isozyme AHAS2; gene ahas2 encoding the AHAS catalytic subunit
-
Helianthus annuus Q5VB49 isozyme AHAS1; gene ahas1 encoding the AHAS catalytic subunit
-
Helianthus annuus HA89 Q5VB42 isozyme AHAS3; gene ahas3 encoding the AHAS catalytic subunit
-
Helianthus annuus HA89 Q5VB44 isozyme AHAS2; gene ahas2 encoding the AHAS catalytic subunit
-
Helianthus annuus HA89 Q5VB49 isozyme AHAS1; gene ahas1 encoding the AHAS catalytic subunit
-

Source Tissue

Source Tissue Comment Organism Textmining
embryo
-
Helianthus annuus
-
embryo maximal expression of ahas2 in immature flowers and embryos Helianthus annuus
-
embryo maximal expression of ahas3 in immature flowers and embryos Helianthus annuus
-
embryo maximal expression of isoforms ahas2 and ahas3 in embryo Helianthus annuus
-
flower
-
Helianthus annuus
-
flower maximal expression of ahas2 in immature flowers and embryos Helianthus annuus
-
flower maximal expression of ahas3 in immature flowers and embryos Helianthus annuus
-
flower maximal expression of isoforms ahas2 and ahas3 in immature flowers Helianthus annuus
-
hypocotyl
-
Helianthus annuus
-
leaf
-
Helianthus annuus
-
leaf highest expression for gene ahas1 in leaves Helianthus annuus
-
leaf highest expression and activity of isoform ahas1 Helianthus annuus
-
additional information the conservation of multiple AHAS isoforms in sunflower seems to result from different expression requirements controlled by tissue-specific regulatory mechanisms at different developmental stages, tissue-specific localization and activity of AHAS isozymes evaluated at several developmental stages, transcriptional levels of ahas genes, overview Helianthus annuus
-
root
-
Helianthus annuus
-
seedling
-
Helianthus annuus
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2 pyruvate
-
Helianthus annuus 2-acetolactate + CO2
-
?
2 pyruvate
-
Helianthus annuus HA89 2-acetolactate + CO2
-
?
pyruvate + 2-oxobutyrate
-
Helianthus annuus 2-aceto-2-hydroxybutyrate + CO2
-
?
pyruvate + 2-oxobutyrate
-
Helianthus annuus HA89 2-aceto-2-hydroxybutyrate + CO2
-
?

Synonyms

Synonyms Comment Organism
acetohydroxyacid synthase
-
Helianthus annuus
AHAS
-
Helianthus annuus
AHAS1
-
Helianthus annuus
AHAS2
-
Helianthus annuus
AHAS3
-
Helianthus annuus
ALS
-
Helianthus annuus

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
37
-
assay at Helianthus annuus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
assay at Helianthus annuus

Cofactor

Cofactor Comment Organism Structure
thiamine diphosphate
-
Helianthus annuus
thiamine diphosphate dependent on Helianthus annuus

General Information

General Information Comment Organism
metabolism enzyme AHAS catalyses the condensation of either two molecules of pyruvate to form acetolactate in the leucine and valine pathway, or of one molecule of pyruvate with one molecule of 2-oxobutyrate toform 2-aceto-2-hydroxybutyrate as the first step in the isoleucine biosynthesis Helianthus annuus