Caffeate 3,4-dioxygenase () is an
enzyme that
catalyzes
Catalysis () is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (). Catalysts are not consumed in the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recyc ...
the
chemical reaction
:3,4-dihydroxy-''trans''-
cinnamate + O
2 3-(2-carboxyethenyl)-''cis'',''cis''-
muconate
Muconic acid is a dicarboxylic acid. There are three isomeric forms designated ''trans,trans''-muconic acid, ''cis,trans''-muconic acid, and ''cis,cis''-muconic acid which differ by the geometry around the double bonds. Its name is derived from ...
Thus, the two
substrates of this enzyme are
3,4-dihydroxy-trans-cinnamate
Caffeic acid is an organic compound that is classified as a hydroxycinnamic acid. This yellow solid consists of both phenolic and acrylic functional groups. It is found in all plants because it is an intermediate in the biosynthesis of lignin, one ...
(caffeic acid) and
oxygen, whereas its
product is
3-(2-carboxyethenyl)-cis,cis-muconate.
This enzyme belongs to the family of
oxidoreductases, specifically those acting on single donors with O
2 as oxidant and incorporation of two atoms of oxygen into the substrate (oxygenases). The oxygen incorporated need not be derived from O
2. The
systematic name of this enzyme class is 3,4-dihydroxy-trans-cinnamate:oxygen 3,4-oxidoreductase (decyclizing). This enzyme participates in
phenylpropanoid biodegradation.
References
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{{Portal bar, Biology, border=no
EC 1.13.11
Enzymes of unknown structure
Hydroxycinnamic acids metabolism