1UYP
The three-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima
Replaces: 1UTWSummary for 1UYP
| Entry DOI | 10.2210/pdb1uyp/pdb |
| Descriptor | BETA-FRUCTOSIDASE, SULFATE ION, CITRIC ACID, ... (6 entities in total) |
| Functional Keywords | invertase, glycosyl hydrolase family 32, sucrose degradation, beta-propeller, hydrolase |
| Biological source | THERMOTOGA MARITIMA |
| Total number of polymer chains | 6 |
| Total formula weight | 301429.71 |
| Authors | Alberto, F.,Bignon, C.,Sulzenbacher, G.,Henrissat, B.,Czjzek, M. (deposition date: 2004-03-02, release date: 2004-03-22, Last modification date: 2018-06-13) |
| Primary citation | Alberto, F.,Bignon, C.,Sulzenbacher, G.,Henrissat, B.,Czjzek, M. The three-dimensional structure of invertase (beta-fructosidase) from Thermotoga maritima reveals a bimodular arrangement and an evolutionary relationship between retaining and inverting glycosidases. J. Biol. Chem., 279:18903-18910, 2004 Cited by PubMed Abstract: Thermotoga maritima invertase (beta-fructosidase) hydrolyzes sucrose to release fructose and glucose, which are major carbon and energy sources for both prokaryotes and eukaryotes. The name "invertase" was given to this enzyme over a century ago, because the 1:1 mixture of glucose and fructose that it produces was named "invert sugar." Despite its name, the enzyme operates with a mechanism leading to the retention of the anomeric configuration at the site of cleavage. The enzyme belongs to family GH32 of the sequence-based classification of glycosidases. The crystal structure, determined at 2-A resolution, reveals two modules, namely a five-bladed beta-propeller with structural similarity to the beta-propeller structures of glycosidase from families GH43 and GH68 connected to a beta-sandwich module. Three carboxylates at the bottom of a deep, negatively charged funnel-shaped depression of the beta-propeller are essential for catalysis and function as nucleophile, general acid, and transition state stabilizer, respectively. The catalytic machinery of invertase is perfectly superimposable to that of the enzymes of families GH43 and GH68. The variation in the position of the furanose ring at the site of cleavage explains the different mechanisms evident in families GH32 and GH68 (retaining) and GH43 (inverting) furanosidases. PubMed: 14973124DOI: 10.1074/jbc.M313911200 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.9 Å) |
Structure validation
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