Galactinol—sucrose galactosyltransferase

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galactinol-sucrose galactosyltransferase
Identifiers
EC no. 2.4.1.82
CAS no. 62213-45-0
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BRENDA BRENDA entry
ExPASy NiceZyme view
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MetaCyc metabolic pathway
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In enzymology, a galactinol-sucrose galactosyltransferase (EC 2.4.1.82) is an enzyme that catalyzes the chemical reaction

alpha-D-galactosyl-(1->3)-1D-myo-inositol + sucrose myo-inositol + raffinose

Thus, the two substrates of this enzyme are alpha-D-galactosyl-(1->3)-1D-myo-inositol and sucrose, whereas its two products are myo-inositol and raffinose.

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is alpha-D-galactosyl-(1->3)-myo-inositol:sucrose 6-alpha-D-galactosyltransferase. Other names in common use include 1-alpha-D-galactosyl-myo-inositol:sucrose, and 6-alpha-D-galactosyltransferase. This enzyme participates in galactose metabolism.

Related Research Articles

<span class="mw-page-title-main">Raffinose</span> Chemical compound

Raffinose is a trisaccharide composed of galactose, glucose, and fructose. It can be found in beans, cabbage, brussels sprouts, broccoli, asparagus, other vegetables, and whole grains. Raffinose can be hydrolyzed to D-galactose and sucrose by the enzyme α-galactosidase (α-GAL), an enzyme which in the lumen of the human digestive tract is only produced by bacteria in the large intestine. α-GAL also hydrolyzes other α-galactosides such as stachyose, verbascose, and galactinol, if present. The enzyme does not cleave β-linked galactose, as in lactose.

<span class="mw-page-title-main">Inositol-3-phosphate synthase</span>

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L-cysteine:1D-myo-inositol 2-amino-2-deoxy-alpha-D-glucopyranoside ligase is an enzyme with systematic name L-cysteine:1-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-1D-myo-inositol ligase (AMP-forming). This enzyme catalyses the following chemical reaction

References


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