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Literature summary for 4.2.1.20 extracted from

  • Hur, O.; Niks, D.; Casino, P.; Dunn, M.F.
    Proton transfers in the beta-reaction catalyzed by tryptophan synthase (2002), Biochemistry, 41, 9991-10001.
    View publication on PubMed
Search for more literature for 4.2.1.20

Inhibitors

Inhibitors Comment Organism Structure
aniline nucleophilic analogue used in place of indole leads to formation of intermediate, but no amino acid formation Salmonella enterica subsp. enterica serovar Typhimurium

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
 additional information kinetics of proton release during beta-reaction, thermodynamic cycle of the interconversion of L-serine and alpha-aminoacrylate intermediate structures Salmonella enterica subsp. enterica serovar Typhimurium

Metals/Ions

Metals/Ions Comment Organism Structure
additional information effects of Na+ and Cs+ in the intermediate formation between L-serine and aniline Salmonella enterica subsp. enterica serovar Typhimurium

Organism

Organism UniProt Comment Textmining
Salmonella enterica subsp. enterica serovar Typhimurium
-
-
-

Reaction

Reaction Comment Organism Reaction ID
L-serine + 1-C-(indol-3-yl)glycerol 3-phosphate = L-tryptophan + D-glyceraldehyde 3-phosphate + H2O also catalyses the conversion of serine and indole into tryptophan and water, and of indoleglycerol phosphate into indole and glyceraldehyde phosphate (the latter reaction was listed formerly as EC 4.2.1.8), catalytic mechanism of beta-reaction Salmonella enterica subsp. enterica serovar Typhimurium
a

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1-(indol-3-yl)glycerol 3-phosphate alpha-subunit of the bienzyme complex, alpha-reaction Salmonella enterica subsp. enterica serovar Typhimurium D-glyceraldehyde 3-phosphate + indole
-
 ?
L-serine + indole beta-subunit of the bienzyme complex, beta-reaction, involves multiple covalent transformations facilitated by proton transfer between the cofactor, the reacting substrates, and acid-base catalytic groups of the enzyme Salmonella enterica subsp. enterica serovar Typhimurium L-tryptophan + H2O
-
 ?

Subunits

Subunits Comment Organism
tetramer alpha2beta2 enzyme complex Salmonella enterica subsp. enterica serovar Typhimurium

Cofactor

Cofactor Comment Organism Structure
pyridoxal 5'-phosphate forms an alpha-aminoacrylate Schiffbase intermediate with L-serine Salmonella enterica subsp. enterica serovar Typhimurium