1GHS
THE THREE-DIMENSIONAL STRUCTURES OF TWO PLANT BETA-GLUCAN ENDOHYDROLASES WITH DISTINCT SUBSTRATE SPECIFICITIES
External Resource: Annotation
Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage
Chains | Domain Info | Class | Fold | Superfamily | Family | Domain | Species | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | d1ghsa_ | Alpha and beta proteins (a/b) | TIM beta/alpha-barrel | (Trans)glycosidases | beta-glycanases | Plant beta-glucanases | (Hordeum vulgare ) [TaxId: 4513 ], | SCOPe (2.08) |
B | d1ghsb_ | Alpha and beta proteins (a/b) | TIM beta/alpha-barrel | (Trans)glycosidases | beta-glycanases | Plant beta-glucanases | (Hordeum vulgare ) [TaxId: 4513 ], | SCOPe (2.08) |
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
Domain Annotation: ECOD Classification ECOD Database Homepage
Chains | Family Name | Domain Identifier | Architecture | Possible Homology | Homology | Topology | Family | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | Glyco_hydro_17 | e1ghsA1 | A: a/b barrels | X: TIM beta/alpha-barrel | H: TIM barrels (From Topology) | T: TIM barrels | F: Glyco_hydro_17 | ECOD (1.6) |
B | Glyco_hydro_17 | e1ghsB1 | A: a/b barrels | X: TIM beta/alpha-barrel | H: TIM barrels (From Topology) | T: TIM barrels | F: Glyco_hydro_17 | ECOD (1.6) |
Domain Annotation: CATH CATH Database Homepage
Chain | Domain | Class | Architecture | Topology | Homology | Provenance Source (Version) |
---|---|---|---|---|---|---|
A | 3.20.20.80 | Alpha Beta | Alpha-Beta Barrel | TIM Barrel | Glycosidases | CATH (4.3.0) |
B | 3.20.20.80 | Alpha Beta | Alpha-Beta Barrel | TIM Barrel | Glycosidases | CATH (4.3.0) |
Protein Family Annotation Pfam Database Homepage
Chains | Accession | Name | Description | Comments | Source |
---|---|---|---|---|---|
PF00332 | Glycosyl hydrolases family 17 (Glyco_hydro_17) | Glycosyl hydrolases family 17 | - | Domain |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
Chains | Accession | Name | Type |
---|---|---|---|
IPR044965 | Glycoside hydrolase family 17, plant | Family | |
IPR000490 | Glycoside hydrolase family 17 | Family | |
IPR017853 | Glycoside hydrolase superfamily | Homologous Superfamily |
Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage
Chains | Enzyme Name | Description | Catalytic Residues |
---|---|---|---|
glucan endo-1,3-beta-D-glucosidase M-CSA #580 | Two plant beta-glucan endohydrolases with distinct substrate specificities, thought to have evolved from the same higher enzyme, which both hydrolyse 1,3-beta-D-glucosidic linkages in 1,3-beta-D-glucans. Chain A is the isoenzyme GII, (1->3)-beta-glucanase with EC:3.2.1.39 and chain B is the isoenzyme EII (1->3, 1->4)- beta glucanase with EC:3.2.1.73. Isoenzyme GII can hydrolyse beta-glucans of fungal cell walls and may therefore contribute to plant defence strategies, whereas isoenzyme GII function in plant cell wall hydrolysis during mobilisation of the endosperm or in germinating grain during the growth of vegetative tissue. Both glucanases have essentially identical alpha/beta barrel folds, with a recognisable cleft where the active site is located in the same position with identical catalytic residues, however beyond the conserved patch that surrounds the catalytic amino acid residues, there are different amino acid substitutions along the substrate-binding cleft leading to different substrate specificities. This protein is a member of glycoside hydrolase family 17. | EC: 3.2.1.39 (PDB Primary Data) |