Glycoside hydrolase family 48
Encyclopedia
In molecular biology, glycoside hydrolase family 48 is a family
of glycoside hydrolases
.
Glycoside hydrolases are a widespread group of enzymes that hydrolyse the glycosidic bond
between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A classification system for glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families. This classification is available on the CAZy(http://www.cazy.org/GH1.html) web site, and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.
Glycoside hydrolase family 48 CAZY GH_48 comprises enzymes with several known activities; endoglucanase ; cellobiohydrolase .
An example of an enzyme containing a domain belonging to this family is one of the cellulases (celA) from the genome of the thermophilic anaerobic bacterium Caldocellum saccharolyticum. The celA gene product is a polypeptide of 1751 amino acids; this has a multidomain structure comprising two catalytic domains and two cellulose-binding domains, linked by Pro-Thr-rich regions. The N-terminal domain encodes an endoglucanase activity on carboxymethylcellulose, consistent with its similarity to several endo-1, 4-beta-D-glucanase sequences, and is a member of the glycoside hydrolase family 9
. The C-terminal domain belongs to this family shows similarity to a cellulase from Clostridium thermocellum
(CelS), which acts synergistically with a second component to hydrolyse crystalline cellulose.
Protein family
A protein family is a group of evolutionarily-related proteins, and is often nearly synonymous with gene family. The term protein family should not be confused with family as it is used in taxonomy....
of glycoside hydrolases
Glycoside hydrolase
Glycoside hydrolases catalyze the hydrolysis of the glycosidic linkage to release smaller sugars...
.
Glycoside hydrolases are a widespread group of enzymes that hydrolyse the glycosidic bond
Glycosidic bond
In chemistry, a glycosidic bond is a type of covalent bond that joins a carbohydrate molecule to another group, which may or may not be another carbohydrate....
between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A classification system for glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families. This classification is available on the CAZy(http://www.cazy.org/GH1.html) web site, and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.
Glycoside hydrolase family 48 CAZY GH_48 comprises enzymes with several known activities; endoglucanase ; cellobiohydrolase .
An example of an enzyme containing a domain belonging to this family is one of the cellulases (celA) from the genome of the thermophilic anaerobic bacterium Caldocellum saccharolyticum. The celA gene product is a polypeptide of 1751 amino acids; this has a multidomain structure comprising two catalytic domains and two cellulose-binding domains, linked by Pro-Thr-rich regions. The N-terminal domain encodes an endoglucanase activity on carboxymethylcellulose, consistent with its similarity to several endo-1, 4-beta-D-glucanase sequences, and is a member of the glycoside hydrolase family 9
Glycoside hydrolase family 9
In molecular biology, glycoside hydrolase family 9 is a family of glycoside hydrolases.Glycoside hydrolases are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety...
. The C-terminal domain belongs to this family shows similarity to a cellulase from Clostridium thermocellum
Clostridium thermocellum
Clostridium thermocellum is an anaerobic, thermophilic bacterium. C. thermocellum has garnered research interest due to its cellulolytic and ethanologenic abilities, being capable of directly converting a cellulosic substrate into ethanol. This makes it useful in converting biomass into a usable...
(CelS), which acts synergistically with a second component to hydrolyse crystalline cellulose.