Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThermotoga maritima invertase (beta-fructosidase), a member of the glycoside hydrolase family GH-32, readily releases beta-D-fructose from sucrose, raffinose and fructan polymers such as inulin. These carbohydrates represent major carbon and energy sources for prokaryotes and eukaryotes. The invertase cleaves beta-fructopyranosidic linkages by a double-displacement mechanism, which involves a nucleophilic aspartate and a catalytic glutamic acid acting as a general acid/base. The three-dimensional structure of invertase shows a bimodular enzyme with a five bladed beta-propeller catalytic domain linked to a beta-sandwich of unknown function. In the present study we report the crystal structure of the inactivated invertase in interaction with the natural substrate molecule alpha-D-galactopyranosyl-(1,6)-alpha-D-glucopyranosyl-beta-D-fructofuranos ide (raffinose) at 1.87 A (1 A=0.1 nm) resolution. The structural analysis of the complex reveals the presence of three binding-subsites, which explains why T. maritima invertase exhibits a higher affinity for raffinose than sucrose, but a lower catalytic efficiency with raffinose as substrate than with sucrose. Crystal structure of inactivated Thermotoga maritima invertase in complex with the trisaccharide substrate raffinose.,Alberto F, Jordi E, Henrissat B, Czjzek M Biochem J. 2006 May 1;395(3):457-62. PMID:16411890[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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