Trans-cinnamate 4-monooxygenase
Encyclopedia
In enzymology, a trans-cinnamate 4-monooxygenase is an enzyme
that catalyzes
the chemical reaction
The 4 substrates
of this enzyme are trans-cinnamate, NADPH
, H+
, and O2
, whereas its 3 products
are 4-hydroxycinnamate, NADP+
, and H2O
.
This enzyme belongs to the family of oxidoreductase
s, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with NADH or NADPH as one donor, and incorporation of one atom o oxygen into the other donor. The systematic name of this enzyme class is trans-cinnamate,NADPH:oxygen oxidoreductase (4-hydroxylating). Other names in common use include cinnamic acid 4-hydroxylase, oxygenase, cinnamate 4-mono-, CA4H, cytochrome P450 cinnamate 4-hydroxylase, cinnamate 4-hydroxylase, cinnamate 4-monooxygenase, cinnamate hydroxylase, cinnamic 4-hydroxylase, cinnamic acid 4-monooxygenase, cinnamic acid p-hydroxylase, hydroxylase, cinnamate 4-, t-cinnamic acid hydroxylase, trans-cinnamate 4-hydroxylase, and trans-cinnamic acid 4-hydroxylase. This enzyme participates in phenylalanine metabolism and phenylpropanoid biosynthesis. It employs one cofactor
, heme
.
Enzyme
Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical reactions in a biological cell need enzymes in order to occur at rates...
that catalyzes
Catalysis
Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in multiple chemical transformations....
the chemical reaction
Chemical reaction
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity...
- trans-cinnamate + NADPH + H+ + O2
4-hydroxycinnamate + NADP+ + H2O
The 4 substrates
Substrate (biochemistry)
In biochemistry, a substrate is a molecule upon which an enzyme acts. Enzymes catalyze chemical reactions involving the substrate. In the case of a single substrate, the substrate binds with the enzyme active site, and an enzyme-substrate complex is formed. The substrate is transformed into one or...
of this enzyme are trans-cinnamate, NADPH
Nicotinamide adenine dinucleotide phosphate
Nicotinamide adenine dinucleotide phosphate, abbreviated NADP or TPN in older notation , is a coenzyme used in anabolic reactions, such as lipid and nucleic acid synthesis, which require NADPH as a reducing agent....
, H+
Hydrogen ion
Hydrogen ion is recommended by IUPAC as a general term for all ions of hydrogen and its isotopes.Depending on the charge of the ion, two different classes can be distinguished: positively charged ions and negatively charged ions....
, and O2
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...
, whereas its 3 products
Product (chemistry)
Product are formed during chemical reactions as reagents are consumed. Products have lower energy than the reagents and are produced during the reaction according to the second law of thermodynamics. The released energy comes from changes in chemical bonds between atoms in reagent molecules and...
are 4-hydroxycinnamate, NADP+
Nicotinamide adenine dinucleotide phosphate
Nicotinamide adenine dinucleotide phosphate, abbreviated NADP or TPN in older notation , is a coenzyme used in anabolic reactions, such as lipid and nucleic acid synthesis, which require NADPH as a reducing agent....
, and H2O
Water
Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...
.
This enzyme belongs to the family of oxidoreductase
Oxidoreductase
In biochemistry, an oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule to another...
s, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with NADH or NADPH as one donor, and incorporation of one atom o oxygen into the other donor. The systematic name of this enzyme class is trans-cinnamate,NADPH:oxygen oxidoreductase (4-hydroxylating). Other names in common use include cinnamic acid 4-hydroxylase, oxygenase, cinnamate 4-mono-, CA4H, cytochrome P450 cinnamate 4-hydroxylase, cinnamate 4-hydroxylase, cinnamate 4-monooxygenase, cinnamate hydroxylase, cinnamic 4-hydroxylase, cinnamic acid 4-monooxygenase, cinnamic acid p-hydroxylase, hydroxylase, cinnamate 4-, t-cinnamic acid hydroxylase, trans-cinnamate 4-hydroxylase, and trans-cinnamic acid 4-hydroxylase. This enzyme participates in phenylalanine metabolism and phenylpropanoid biosynthesis. It employs one cofactor
Cofactor (biochemistry)
A cofactor is a non-protein chemical compound that is bound to a protein and is required for the protein's biological activity. These proteins are commonly enzymes, and cofactors can be considered "helper molecules" that assist in biochemical transformations....
, heme
Heme
A heme or haem is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin. Not all porphyrins contain iron, but a substantial fraction of porphyrin-containing metalloproteins have heme as their prosthetic group; these are...
.