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Details on Person Extracellular lactose is hydrolyzed to yield molecules of gl...

Class:IdSummation:189031
_displayNameExtracellular lactose is hydrolyzed to yield molecules of gl...
_timestamp2015-02-15 17:43:43
created[InstanceEdit:189008] D'Eustachio, P, 2006-11-03 14:39:28
modified[InstanceEdit:191105] D'Eustachio, P, 2007-01-18 18:40:09
[InstanceEdit:5658057] D'Eustachio, Peter, 2014-12-16
[InstanceEdit:5675267] D'Eustachio, Peter, 2015-02-15
textExtracellular lactose is hydrolyzed to yield molecules of glucose and galactose, in a reaction catalyzed by the lactase activity of lactase-phlorizin hydrolase associated with the plasma membrane. In the body, lactase-phlorzin hydrolase is found on the external face of enterocytes in microvilli of the small intestine (Hauri et al. 1985). Expression of the enzyme is developmentally regulated and subject to a genetic polymorphism: enzyme levels fall after weaning but the extent of the fall varies sharply between human populations (Grand et al. 2003; Swallow 2003). The lactase-phlorizin hydrolase polypeptide undergoes dimerization and two rounds of proteolytic cleavage in the course of its maturation and transport to the cell surface (Grunberg and Sterchi 1995; Wuthrich et al. 1996; Behrendt et al. 2010).
(summation)[Reaction:189062] lactose + H2O => D-glucose + D-galactose [Homo sapiens]
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