5.1.99.3: allantoin racemase
This is an abbreviated version!
For detailed information about allantoin racemase, go to the full flat file.
Word Map on EC 5.1.99.3
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5.1.99.3
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racemization
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allantoinase
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purine
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allantoate
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urate
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sephadex
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nonenzymatic
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uric
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enantiomer
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klebsiella
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deae-cellulose
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utilis
- 5.1.99.3
-
racemization
- allantoinase
- purine
- allantoate
- urate
- sephadex
-
nonenzymatic
-
uric
-
enantiomer
-
klebsiella
- deae-cellulose
- utilis
Reaction
Synonyms
allantoin racemase, AllR, BFW91_04965, HpxA, HpxA enzyme, KPN_01788, Racemase, allantoin
ECTree
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Substrates Products
Substrates Products on EC 5.1.99.3 - allantoin racemase
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REACTION DIAGRAM
(R)-allantoin
(S)-allantoin
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r
(S)-allantoin
(R)-allantoin
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r
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stepwise reaction mechanism via a planar unprotonated intermediate. A pair of cysteine residues promotes the stereoinversion of a carbon atom of the ligand without the assistance of cofactors, quantum mechanics/molecular mechanics calculations
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additional information
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stepwise reaction mechanism via a planar unprotonated intermediate. A pair of cysteine residues promotes the stereoinversion of a carbon atom of the ligand without the assistance of cofactors, quantum mechanics/molecular mechanics calculations
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-
?
additional information
?
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Allantoin can undergo racemization through formation of a bicyclic intermediate (faster) or proton exchange at the chiral center (slower). The velocity of the reaction via a bicyclic intermediate is unaffected by the enzyme, whereas the velocity of the reaction via the chiral center is increased by 7 orders of magnitude
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additional information
?
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Allantoin can undergo racemization through formation of a bicyclic intermediate (faster) or proton exchange at the chiral center (slower). The velocity of the reaction via a bicyclic intermediate is unaffected by the enzyme, whereas the velocity of the reaction via the chiral center is increased by 7 orders of magnitude
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