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Lactase (EC 3.2.1.108) is an enzyme produced by many organisms and is essential to the complete digestion of whole milk. It breaks down the sugar lactose into its component parts, galactose and glucose. Lactase is found in the brush border of the small intestine of humans and other mammals.
The Enzyme Commission number (EC number) is a numerical classification scheme for enzymes, based on the chemical reactions they catalyze. [1] As a system of enzyme nomenclature, every EC number is associated with a recommended name for the corresponding enzyme-catalyzed reaction. EC numbers do not specify enzymes but enzyme-catalyzed reactions.
Function: lactase is located in the small digestives system of people and other creatures such as mammals. Lactase is the bases of the total absorption of milk. Clinical Significance: People who are lactose intolerant have medicine that can help with the digestion. When you are lactose intolerant you might experience gas, bloating, and pain ...
[24] [25] and, as a result, the mutant enzyme is able to replace the lacZ β-galactosidase. [26] EbgA and LacZ are 50% identical on the DNA level and 33% identical on the amino acid level. [27] The active ebg enzyme is an aggregate of ebgA -gene and ebgC-gene products in a 1:1 ratio with the active form of ebg enzymes being an α4 β4 hetero ...
The enzyme lactase is required for degradation of the milk sugar lactose and is ... A classification system for glycosyl hydrolases, based on sequence similarity, has ...
The lactose operon (lac operon) is an operon required for the transport and metabolism of lactose in E. coli and many other enteric bacteria.Although glucose is the preferred carbon source for most enteric bacteria, the lac operon allows for the effective digestion of lactose when glucose is not available through the activity of β-galactosidase. [1]
Lactose synthase is an enzyme that generates lactose from glucose and UDP-galactose.. It is classified under EC 2.4.1.22.. It consists of N-acetyllactosamine synthase and alpha-lactalbumin.
A classification system for glycoside hydrolases, based on sequence similarity, has led to the definition of over 100 different families. [1] [2] [3] This classification is available on the CAZy web site, [4] [5] and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes. [6] [7]