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 1M53 | pdb_00001m53

CRYSTAL STRUCTURE OF ISOMALTULOSE SYNTHASE (PALI) FROM KLEBSIELLA SP. LX3

External Resource: Annotation


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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1m53a1 All beta proteins Glycosyl hydrolase domain Glycosyl hydrolase domain alpha-Amylases, C-terminal beta-sheet domain Isomaltulose synthase PalI (Klebsiella variicola ) [TaxId: 244366 ], SCOPe (2.08)
Ad1m53a2 Alpha and beta proteins (a/b) TIM beta/alpha-barrel (Trans)glycosidases Amylase, catalytic domain Isomaltulose synthase PalI (Klebsiella variicola ) [TaxId: 244366 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 Familyalpha-Amylases, C-terminal beta-sheet domain 8020301 4002636 SCOP2 (2022-06-29)
ASCOP2 FamilyAmylase, catalytic domain 8020305 4003138 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyGlycosyl hydrolase domain-like 8032681 3001528 SCOP2 (2022-06-29)
ASCOP2 Superfamily(Trans)glycosidases 8032685 3000313 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ASusG_Ce1m53A1 A: beta sandwichesX: Glycosyl hydrolase domain-likeH: Glycosyl hydrolase domainT: Glycosyl hydrolase domainF: SusG_CECOD (v295.2)
AAlpha-amylasee1m53A2 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrelsT: TIM barrelsF: Alpha-amylaseECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.20.20.80 Alpha Beta Alpha-Beta Barrel TIM Barrel GlycosidasesCATH (4.3.0)
A3.90.400.10 Alpha Beta Alpha-Beta Complex Oligo-1,6-glucosidase domain 2CATH (4.3.0)
A2.60.40.1180 Mainly Beta Sandwich Immunoglobulin-like Golgi alpha-mannosidase IICATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
Isomaltulose Synthase

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
IPR056300Alpha-amylase SusG-like, C-terminal domainDomain
IPR045857Oligo-1,6-glucosidase, domain 2Homologous Superfamily
IPR006047Glycosyl hydrolase family 13, catalytic domainDomain
IPR017853Glycoside hydrolase superfamilyHomologous Superfamily
IPR013780Glycosyl hydrolase, all-betaHomologous Superfamily

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

ChainsEnzyme NameDescriptionCatalytic Residues
isomaltulose synthase  M-CSA #582

Isomaltulose synthase (PalI), also known as sucrose isomerase, catalyses the isomerisation of sucrose to produce isomaltulose (alpha-D-glucosylpyranosyl-1,6-D-fructofuranose) and trehalulose (alpha-D-glucosylpyranosyl-1,1-D-fructofuranose) as the main products with residual amounts of glucose and fructose isomaltulose and trehalulose, two functional isomers of sucrose, have been suggested as non-cariogenic alternatives to sucrose and are widely used in health products and the food industry.

Defined by 2 residues: ASP:A-213 [auth A-241]GLU:A-267 [auth A-295]
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Explore in 3D: M-CSA Motif Definition
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EC: 5.4.99.11 (PDB Primary Data)