7ZYA
Structure of Chit33 from Trichoderma harzianum.
Summary for 7ZYA
| Entry DOI | 10.2210/pdb7zya/pdb |
| Related | 7ZY9 |
| Descriptor | Endochitinase 33, 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL, DI(HYDROXYETHYL)ETHER, ... (5 entities in total) |
| Functional Keywords | chitinase, endo-chitinase, glycoside hydrolase, fungal chitinase, thichoderma harzianum, gh18 family, chitooligosaccharide, oligosaccharide, cos, chitin, chitosan, chitintetraose., hydrolase., hydrolase |
| Biological source | Trichoderma harzianum |
| Total number of polymer chains | 1 |
| Total formula weight | 33026.40 |
| Authors | Jimenez-Ortega, E.,Sanz-Aparicio, J. (deposition date: 2022-05-24, release date: 2022-08-31, Last modification date: 2024-11-13) |
| Primary citation | Jimenez-Ortega, E.,Kidibule, P.E.,Fernandez-Lobato, M.,Sanz-Aparicio, J. Structure-Function Insights into the Fungal Endo -Chitinase Chit33 Depict its Mechanism on Chitinous Material. Int J Mol Sci, 23:-, 2022 Cited by PubMed Abstract: Chitin is the most widespread amino renewable carbohydrate polymer in nature and the second most abundant polysaccharide. Therefore, chitin and chitinolytic enzymes are becoming more importance for biotechnological applications in food, health and agricultural fields, the design of effective enzymes being a paramount issue. We report the crystal structure of the plant-type -chitinase Chit33 from and its D165A/E167A-Chit33-(NAG) complex, which showed an extended catalytic cleft with six binding subsites lined with many polar interactions. The major trait of Chit33 is the location of the non-conserved Asp117 and Arg274 acting as a clamp, fixing the distorted conformation of the sugar at subsite -1 and the bent shape of the substrate, which occupies the full catalytic groove. Relevant residues were selected for mutagenesis experiments, the variants being biochemically characterized through their hydrolytic activity against colloidal chitin and other polymeric substrates with different molecular weights and deacetylation percentages. The mutant S118Y stands out, showing a superior performance in all the substrates tested, as well as detectable transglycosylation capacity, with this variant providing a promising platform for generation of novel Chit33 variants with adjusted performance by further design of rational mutants'. The putative role of Tyr in binding was extrapolated from molecular dynamics simulation. PubMed: 35886948DOI: 10.3390/ijms23147599 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.12 Å) |
Structure validation
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