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Information on EC 3.5.99.7 - 1-aminocyclopropane-1-carboxylate deaminase

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IUBMB Comments
A pyridoxal 5'-phosphate enzyme. The enzyme, found in certain soil bacteria and fungi, catalyses the ring opening of 1-aminocyclopropane-1-carboxylate, the immediate precursor to ethylene, an important plant hormone that regulates fruit ripening and other processes. The enzyme releases an unstable enamine product that tautomerizes to an imine form, which undergoes a hydrolytic deamination. The latter reaction, which can occur spontaneously, can also be catalysed by EC 3.5.99.10, 2-iminobutanoate/2-iminopropanoate deaminase. The enzyme has been used to make fruit ripening dependent on externally added ethylene, as it removes the substrate for endogenous ethylene formation.
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Word Map
The enzyme appears in viruses and cellular organisms
Reaction Schemes
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Synonyms
acc deaminase, acc-deaminase, 1-aminocyclopropane-1-carboxylic acid deaminase, 1-aminocyclopropane-1-carboxylic acid-deaminase, acpc deaminase, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
1-aminocyclopropane-1-carboxylate + H2O = 2-oxobutanoate + NH3
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1-aminocyclopropane-1-carboxylate = 2-aminobut-2-enoate
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(1a)
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2-aminobut-2-enoate = 2-iminobutanoate
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spontaneous
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2-iminobutanoate + H2O = 2-oxobutanoate + NH3
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spontaneous
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PATHWAY SOURCE
PATHWAYS