1EX1

BETA-D-GLUCAN EXOHYDROLASE FROM BARLEY

External Resource: Annotation


Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1ex1a1 Alpha and beta proteins (a/b) TIM beta/alpha-barrel (Trans)glycosidases NagZ-like Beta-D-glucan exohydrolase, N-terminal domain (Hordeum vulgare ) [TaxId: 4513 ], SCOPe (2.08)
Ad1ex1a2 Alpha and beta proteins (a/b) Flavodoxin-like Beta-D-glucan exohydrolase, C-terminal domain-like Beta-D-glucan exohydrolase, C-terminal domain-like Beta-D-glucan exohydrolase, C-terminal domain (Hordeum vulgare ) [TaxId: 4513 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B Superfamily(Trans)glycosidases 8033575 3000313 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyBeta-D-glucan exohydrolase, C-terminal domain 8033576 3001349 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AGlyco_hydro_3e1ex1A1 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: Glyco_hydro_3ECOD (1.6)
AGlyco_hydro_3_Ce1ex1A2 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Beta-D-glucan exohydrolase, C-terminal domain (From Topology)T: Beta-D-glucan exohydrolase, C-terminal domainF: Glyco_hydro_3_CECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.20.20.300 Alpha Beta Alpha-Beta Barrel TIM Barrel Glycoside hydrolase, family 3, N-terminal domainCATH (4.3.0)
A3.40.50.1700 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold Glycoside hydrolase family 3 C-terminal domainCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF00933Glycosyl hydrolase family 3 N terminal domain (Glyco_hydro_3)Glycosyl hydrolase family 3 N terminal domain- Domain
PF01915Glycosyl hydrolase family 3 C-terminal domain (Glyco_hydro_3_C)Glycosyl hydrolase family 3 C-terminal domainThis domain is involved in catalysis and may be involved in binding beta-glucan [1]. This domain is found associated with Pfam:PF00933.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
PROTEIN (BETA-D-GLUCAN EXOHYDROLASE ISOENZYME EXO1)

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
IPR001764Glycoside hydrolase, family 3, N-terminalDomain
IPR036962Glycoside hydrolase, family 3, N-terminal domain superfamilyHomologous Superfamily
IPR017853Glycoside hydrolase superfamilyHomologous Superfamily
IPR051915Cellulose Degradation Glycosyl Hydrolase 3Family
IPR036881Glycoside hydrolase family 3 C-terminal domain superfamilyHomologous Superfamily
IPR002772Glycoside hydrolase family 3 C-terminal domainDomain

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
glucan 1,3-beta-glucosidase  M-CSA #790

Barley beta-D-glucan exohydrolasesbelong to family 3 of glucosyl hydrolases. ExoI is one of two beta-D-glucan exohydrolase isoenzymes that hydrolyse a broad range of substrates with (1-2)-, (1-3)-, (1-4)-, and (1-6)-beta-D-glucosidic linkages. The enzyme removes single glucose units from the non-reducing termini of polymeric and oligomeric substrates with the retention of anomeric configuration. The selective hydrolysis of glycosidic bonds is crucial for key processes of plant development and growth, such as cell wall expansion and degradation, and turnover of signalling molecules.

Defined by 2 residues: ASP:A-285GLU:A-491
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Explore in 3D: M-CSA Motif Definition
Search M-CSA Motif
EC: 3.2.1.58 (PDB Primary Data)
EC: 3.2.1.21 (UniProt)