Apigenin (4′,5,7-trihydroxyflavone), found in many plants, is a natural product belonging to the flavone class that is the aglycone of several naturally occurring glycosides. It is a yellow crystalline solid that has been used to dye wool.
Carbamoyl phosphate synthetase catalyzes the ATP-dependent synthesis of carbamoyl phosphate from glutamine or ammonia and bicarbonate. This enzyme catalyzes the reaction of ATP and bicarbonate to produce carboxy phosphate and ADP. Carboxy phosphate reacts with ammonia to give carbamic acid. In turn, carbamic acid reacts with a second ATP to give carbamoyl phosphate plus ADP.
Biopterins are pterin derivatives which function as endogenous enzyme cofactors in many species of animals and in some bacteria and fungi. The prototypical compound of the class is biopterin, as shown in the infobox. Biopterins act as cofactors for aromatic amino acid hydroxylases (AAAH), which are involved in synthesizing a number of neurotransmitters including dopamine, norepinephrine, epinepherine, and serotonin, along with several trace amines. Nitric oxide synthesis also uses biopterin derivatives as cofactors. In humans, tetrahydrobiopterin (BH4) is the endogenous cofactor for AAAH enzymes.
In enzymology, a 6-pyruvoyltetrahydropterin 2'-reductase (EC 1.1.1.220) is an enzyme that catalyzes the chemical reaction
In enzymology, a diphthine synthase is an enzyme that catalyzes the chemical reaction
In enzymology, a preQ1 synthase (EC 1.7.1.13) is an enzyme that catalyzes the chemical reaction
In enzymology, a pteridine reductase (EC 1.5.1.33) is an enzyme that catalyzes the chemical reaction
Isochorismate synthase ( EC 5.4.4.2) is an isomerase enzyme that catalyzes the first step in the biosynthesis of vitamin K2 (menaquinone) in Escherichia coli.
In enzymology, a putrescine carbamoyltransferase is an enzyme that catalyzes the chemical reaction
The enzyme indole-3-glycerol-phosphate synthase (IGPS) (EC 4.1.1.48) catalyzes the chemical reaction
The enzyme 6-pyruvoyltetrahydropterin synthase catalyzes the following chemical reaction:
In enzymology, a 2-isopropylmalate synthase (EC 2.3.3.13) is an enzyme that catalyzes the chemical reaction
In enzymology, a N-acylneuraminate-9-phosphate synthase (EC 2.5.1.57) is an enzyme that catalyzes the chemical reaction
Sepiapterin reductase (L-threo-7,8-dihydrobiopterin forming) (EC 1.1.1.325) is an enzyme with systematic name L-threo-7,8-dihydrobiopterin:NADP+ oxidoreductase. This enzyme catalyses the following chemical reaction
Archaeosine synthase is an enzyme with systematic name L-glutamine:7-cyano-7-carbaguanine aminotransferase. This enzyme catalyses the following chemical reaction
6-carboxytetrahydropterin synthase (EC 4.1.2.50, CPH4 synthase, queD (gene), ToyB, ykvK (gene)) is an enzyme with systematic name 7,8-dihydroneopterin 3'-triphosphate acetaldehyde-lyase (6-carboxy-5,6,7,8-tetrahydropterin and triphosphate-forming). This enzyme catalyses the following reversible chemical reaction.
Methylornithine synthase is an enzyme with systematic name L-lysine carboxy-aminomethylmutase. This enzyme catalyses the conversion of L-lysine into (3R)-3-methyl-D-ornithine.
Tetrahydrosarcinapterin synthase is an enzyme with systematic name tetrahydromethanopterin:alpha-L-glutamate ligase (ADP-forming). This enzyme catalyses the following chemical reaction
7-cyano-7-deazaguanine synthase (EC 6.3.4.20, preQ0 synthase, 7-cyano-7-carbaguanine synthase, queC (gene)) is an enzyme with systematic name 7-carboxy-7-carbaguanine:ammonia ligase (ADP-forming). This enzyme catalyses the following chemical reaction
