Based on this information, what type of enzyme would ornithine decarboxylase be? I searched it up on Google and sources say it is a lyase because it catalyzes cleavage without H2O, but in equation 1, isn't water part of the reaction? Is decarboxylase still a lyase because water is a reactant, not a catalyst?

Human Anatomy & Physiology (11th Edition)
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Based on this information, what type of enzyme would ornithine decarboxylase be? I searched it up on Google and sources say it is a lyase because it catalyzes cleavage without H2O, but in equation 1, isn't water part of the reaction? Is decarboxylase still a lyase because water is a reactant, not a catalyst?

Ornithine (R = -CH₂CH₂CH₂NH₂) is an amino acid that is found in cells, but not incorporated into
proteins. In mammals and many other organisms, it can be converted to diaminobutane via the ornithine
decarboxylase reaction, an early event in cell division. (See Equation 1.)
ornithine + H₂O
H₂NCH₂CH₂CH₂CH₂NH₂ + HCO3
Equation 1
Transcribed Image Text:Ornithine (R = -CH₂CH₂CH₂NH₂) is an amino acid that is found in cells, but not incorporated into proteins. In mammals and many other organisms, it can be converted to diaminobutane via the ornithine decarboxylase reaction, an early event in cell division. (See Equation 1.) ornithine + H₂O H₂NCH₂CH₂CH₂CH₂NH₂ + HCO3 Equation 1
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