Rhamnogalacturonan rhamnohydrolase

Rhamnogalacturonan rhamnohydrolase (EC 3.2.1.174, RG-rhamnohydrolase, RG alpha-L-rhamnopyranohydrolase) is an enzyme with systematic name rhamnogalacturonan oligosaccharide alpha-L-Rha-(1->4)-alpha-D-GalA rhamnohydrolase.^[1]^[2] This enzyme catalyses the following chemical reaction

Exohydrolysis of the alpha-L-Rha-(1->4)-alpha-D-GalA bond in rhamnogalacturonan oligosaccharides with initial inversion of configuration releasing beta-L-rhamnose from the non-reducing end of rhamnogalacturonan oligosaccharides.

The enzyme is part of the degradation system for rhamnogalacturonan I in Aspergillus aculeatus.

References

↑ Pitson, S.M., Mutter, M., van den Broek, L.A., Voragen, A.G. and Beldman, G. (1998). "Stereochemical course of hydrolysis catalysed by α-L-rhamnosyl and α-D-galacturonosyl hydrolases from Aspergillus aculeatus". Biochem. Biophys. Res. Commun. 242: 552–559. doi:10.1006/bbrc.1997.8009. PMID 9464254.
↑ Mutter, M., Beldman, G., Schols, H.A. and Voragen, A.G. (1994). "Rhamnogalacturonan α-L-rhamnopyranohydrolase. A novel enzyme specific for the terminal nonreducing rhamnosyl unit in rhamnogalacturonan regions of pectin". Plant Physiol. 106: 241–250. doi:10.1104/pp.106.1.241. PMID 7972516.

External links

Rhamnogalacturonan rhamnohydrolase at the US National Library of Medicine Medical Subject Headings (MeSH)

Hydrolase: sugar hydrolases (EC 3.2)

3.2.1: Glycoside hydrolases

Disaccharidase	Sucrase/Sucrase-isomaltase/Invertase Maltase Trehalase Lactase

Glucosidases	Cellulase Alpha-glucosidase Acid Neutral AB Neutral C Beta-glucosidase cytosolic Debranching enzyme

Other	Amylase Alpha-amylase Chitinase Lysozyme Neuraminidase NEU1 NEU2 NEU3 NEU4 Bacterial neuraminidase Viral neuraminidase Galactosidases Alpha Beta alpha-Mannosidase Glucuronidase Hyaluronidase Pullulanase Glucosylceramidase lysosomal non-lysosomal Galactosylceramidase Alpha-N-acetylgalactosaminidase NAGA Alpha-N-acetylglucosaminidase Fucosidase Hexosaminidase HEXA HEXB Iduronidase Maltase-glucoamylase Heparanase HPSE2

3.2.2: Hydrolysing
N-Glycosyl compounds

DNA glycosylases: Oxoguanine glycosylase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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