4.1.99.1: tryptophanase
This is an abbreviated version!
For detailed information about tryptophanase, go to the full flat file.
Word Map on EC 4.1.99.1
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4.1.99.1
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quinonoid
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transposase
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aldimine
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proteus
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phenol-lyase
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thermonuclease
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beta-elimination
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l-trp
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tryptophan-induced
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antitermination
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pyridoxal-p
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rho-dependent
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rapid-scanning
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phillips
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alvei
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analysis
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food industry
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biotechnology
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drug development
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medicine
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synthesis
- 4.1.99.1
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quinonoid
- transposase
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aldimine
- proteus
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phenol-lyase
- thermonuclease
-
beta-elimination
- l-trp
-
tryptophan-induced
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antitermination
-
pyridoxal-p
-
rho-dependent
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rapid-scanning
-
phillips
- alvei
- analysis
- food industry
- biotechnology
- drug development
- medicine
- synthesis
Reaction
Synonyms
L-tryptophan indole-lyase, L-tryptophanase, TIL, tna2, TnaA, tnaA2, TNase, Tpase, Trpase, tryptophan indole lyase, tryptophan indole-lyase, tryptophan-indole lyase, tryptophanase, tryptophanase 2, VcTrpase
ECTree
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Reaction
Reaction on EC 4.1.99.1 - tryptophanase
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L-tryptophan + H2O = indole + pyruvate + NH3
in the reverse direction NH4+ interacts with bound pyridoxal 5'-phosphate to form an imine. Pyruvate is the second substrate, indole the third. alpha-Aminoacrylate functions as a common enzyme-bound intermediate in both synthetic and degradative reactions
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L-tryptophan + H2O = indole + pyruvate + NH3
mechanism that requires two catalytic bases
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L-tryptophan + H2O = indole + pyruvate + NH3
quinonoid intermediate formation involving Tyr71 and Cys298, mechanism, active site preorganization, overview
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L-tryptophan + H2O = indole + pyruvate + NH3
an active site base is essential for activity, and alpha-deuterated substrate exhibits modest primary isotope effects on kcat and kcat/Km, suggesting that substrate deprotonation is partially rate-limiting. Pre-steady state kinetics with enzyme TIL show rapid formation of an external aldimine intermediate, followed by deprotonation to give a quinonoid intermediate absorbing at about 500 nm. The mechanism of TIL requires both substrate strain and acid/base catalysis, and substrate strain is probably responsible for the very high substrate specificity of TIL. Acid-base catalysis mechanism of TIL, overview. The indole ring is preorganized into the active conformation before alpha-deprotonation occurs
L-tryptophan + H2O = indole + pyruvate + NH3
an active site base is essential for activity, and alpha-deuterated substrate exhibits modest primary isotope effects on kcat and kcat/Km, suggesting that substrate deprotonation is partially rate-limiting. Pre-steady state kinetics with enzyme TIL show rapid formation of external an aldimine intermediate, followed by deprotonation to give a quinonoid intermediate absorbing at about 500 nm. The mechanism of TIL requires both substrate strain and acid/base catalysis, and substrate strain is probably responsible for the very high substrate specificity of TIL. Acid-base catalysis mechanism of TIL, overview. The indole ring is preorganized into the active conformation before alpha-deprotonation occurs
L-tryptophan + H2O = indole + pyruvate + NH3
catalyses the reaction in which L-tryptophan is degraded to indole, pyruvate and ammonia via alpha,beta-elimination and beta-replacement mechanisms
L-tryptophan + H2O = indole + pyruvate + NH3
proposed mechanism of tryptophan indole-lyase, overview
L-tryptophan + H2O = indole + pyruvate + NH3
reaction via formation of quinonoid intermediate
L-tryptophan + H2O = indole + pyruvate + NH3
reaction mechanism, overview
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