Posts Tagged ‘Enzymes of unknown structure’

What is Zeatin reductase

Friday, December 19th, 2008

In enzymology, a zeatin reductase (EC 1.3.1.69) is an enzyme that catalyzes the chemical reaction
dihydrozeatin + NADP+ zeatin + NADPH + H+

Thus, the two substrates of this enzyme are dihydrozeatin and NADP+, whereas its 3 products are zeatin, NADPH, and H+.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is dihydrozeatin:NADP+ oxidoreductase.

What is Zeatin O-beta-D-xylosyltransferase

Friday, December 19th, 2008

In enzymology, a zeatin O-beta-D-xylosyltransferase (EC 2.4.2.40) is an enzyme that catalyzes the chemical reaction
UDP-D-xylose + zeatin UDP + O-beta-D-xylosylzeatin

Thus, the two substrates of this enzyme are UDP-D-xylose and zeatin, whereas its two products are UDP and O-beta-D-xylosylzeatin.

This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases. The systematic name of this enzyme class is UDP-D-xylose:zeatin O-beta-D-xylosyltransferase. Other names in common use include uridine diphosphoxylose-zeatin xylosyltransferase, and zeatin O-xylosyltransferase.

What is Zeatin 9-aminocarboxyethyltransferase

Friday, December 19th, 2008

In enzymology, a zeatin 9-aminocarboxyethyltransferase (EC 2.5.1.50) is an enzyme that catalyzes the chemical reaction
O-acetyl-L-serine + zeatin lupinate + acetate

Thus, the two substrates of this enzyme are O-acetyl-L-serine and zeatin, whereas its two products are lupinate and acetate.

This enzyme belongs to the family of transferases, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is O3-acetyl-L-serine:zeatin 2-amino-2-carboxyethyltransferase. Other names in common use include beta-(9-cytokinin)-alanine synthase, beta-(9-cytokinin)alanine synthase, O-acetyl-L-serine acetate-lyase (adding N6-substituted adenine), lupinate synthetase, lupinic acid synthase, lupinic acid synthetase, and 3-O-acetyl-L-serine:zeatin 2-amino-2-carboxyethyltransferase.

What is Z-farnesyl diphosphate synthase

Friday, December 19th, 2008

In enzymology, a Z-farnesyl diphosphate synthase (EC 2.5.1.68) is an enzyme that catalyzes the chemical reaction
geranyl diphosphate + isopentenyl diphosphate diphosphate + (2Z,6E)-farnesyl diphosphate

Thus, the two substrates of this enzyme are geranyl diphosphate and isopentenyl diphosphate, whereas its two products are diphosphate and (2Z,6E)-farnesyl diphosphate.

This enzyme belongs to the family of transferases, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is geranyl-diphosphate:isopentenyl-diphosphate geranylcistransferase. This enzyme is also called (Z)-farnesyl diphosphate synthase

What is Xylono-1,4-lactonase

Friday, December 19th, 2008

In enzymology, a xylono-1,4-lactonase (EC 3.1.1.68) is an enzyme that catalyzes the chemical reaction
D-xylono-1,4-lactone + H2O D-xylonate

Thus, the two substrates of this enzyme are D-xylono-1,4-lactone and H2O, whereas its product is D-xylonate.

This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name of this enzyme class is D-xylono-1,4-lactone lactonohydrolase. Other names in common use include xylono-g-lactonase, and xylonolactonase. This enzyme participates in pentose and glucuronate interconversions.

What is Xylonate dehydratase

Friday, December 19th, 2008

In enzymology, a xylonate dehydratase (EC 4.2.1.82) is an enzyme that catalyzes the chemical reaction
D-xylonate 2-dehydro-3-deoxy-D-xylonate + H2O

Hence, this enzyme has one substrate, D-xylonate, and two products, 2-dehydro-3-deoxy-D-xylonate and H2O.

This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is D-xylonate hydro-lyase (2-dehydro-3-deoxy-D-xylonate-forming). Other names in common use include D-xylo-aldonate dehydratase, D-xylonate dehydratase, and D-xylonate hydro-lyase. This enzyme participates in pentose and glucuronate interconversions.

What is Xyloglucan-specific exo-beta-1,4-glucanase

Friday, December 19th, 2008

In enzymology, a xyloglucan-specific exo-beta-1,4-glucanase (EC 3.2.1.155) is an enzyme that catalyzes the chemical reaction
xyloglucan + H2O xyloglucan oligosaccharides (exohydrolysis of 1,4-beta-D-glucosidic linkages in xyloglucan)

Thus, the two substrates of this enzyme are xyloglucan and H2O, and its products are xyloglucan oligosaccharides (exohydrolysis of 1,4-beta-D-glucosidic linkages in xyloglucan).

This enzyme belongs to the family of hydrolases, specifically those glycosidases that hydrolyse O- and S-glycosyl compounds. The systematic name of this enzyme class is [(1->6)-alpha-D-xylo]-(1->4)-beta-D-glucan exo-glucohydrolase. This enzyme is also called Cel74A.

What is Xyloglucan 6-xylosyltransferase

Friday, December 19th, 2008

In enzymology, a xyloglucan 6-xylosyltransferase (EC 2.4.2.39) is an enzyme that catalyzes the chemical reaction in which an alpha-D-xylosyl residue is transferred from UDP-D-xylose to a glucose residue in xyloglucan, being attached by an alpha-1,6-D-xylosyl-D-glucose bond.

This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases. The systematic name of this enzyme class is UDP-D-xylose:xyloglucan 1,6-alpha-D-xylosyltransferase. Other names in common use include uridine diphosphoxylose-xyloglucan 6alpha-xylosyltransferase, and xyloglucan 6-alpha-D-xylosyltransferase.

What is Xyloglucan 4-glucosyltransferase

Friday, December 19th, 2008

In enzymology, a xyloglucan 4-glucosyltransferase (EC 2.4.1.168) is an enzyme that catalyzes the chemical reaction in which a beta-D-glucosyl residue is transferred from UDP-glucose to another glucose residue in xyloglucan, linked by a beta-1,4-D-glucosyl-D-glucose bond.

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-glucose:xyloglucan 1,4-beta-D-glucosyltransferase. Other names in common use include uridine diphosphoglucose-xyloglucan 4beta-glucosyltransferase, xyloglucan 4beta-D-glucosyltransferase, and xyloglucan glucosyltransferase

What is Xylitol oxidase

Friday, December 19th, 2008

In enzymology, a xylitol oxidase (EC 1.1.3.41) is an enzyme that catalyzes the chemical reaction
xylitol + O2 xylose + H2O2

Thus, the two substrates of this enzyme are xylitol and O2, whereas its two products are xylose and H2O2.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with oxygen as acceptor. The systematic name of this enzyme class is xylitol:oxygen oxidoreductase.