8YK3 | pdb_00008yk3

Experimental Data Snapshot

Starting Model: experimental
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Ligand Structure Quality Assessment

This is version 1.1 of the entry. See complete history.

(2024) J Appl Glycosci (1999) 71: 81-90

PubMed Abstract:
To overcome incompatibility issues and increase the possibility of blood transfusion, technologies that enable efficient conversion of A- and B-type red blood cells to the universal donor O-type is desirable. Although several blood type-converting enzymes have been identified, detailed understanding about their molecular functions is limited. α-Galactosidase from Bifidobacterium bifidum JCM 1254 (AgaBb), belonging to glycoside hydrolase (GH) 110 subfamily A, specifically acts on blood group B antigen. Here we present the crystal structure of AgaBb, including the catalytic GH110 domain and part of the C-terminal uncharacterized regions. Based on this structure, we deduced a possible binding mechanism of blood group B antigen to the active site. Site-directed mutagenesis confirmed that R270 and E380 recognize the fucose moiety in the B antigen. Thermal shift assay revealed that the C-terminal uncharacterized region significantly contributes to protein stability. This region is shared only among GH110 enzymes from B. bifidum and some Ruminococcus species. The elucidation of the molecular basis for the specific recognition of blood group B antigen is expected to lead to the practical application of blood group conversion enzymes in the future.

Organizational Affiliation

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha-galactosidase	A, B	673	Bifidobacterium bifidum JCM 1254	Mutation(s): 0 Gene Names: agabb, GBA83_07165 EC: 3.2.1
UniProt
Find proteins for L8B3G2 (Bifidobacterium bifidum) Explore L8B3G2 Go to UniProtKB: L8B3G2
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	L8B3G2
Sequence Annotations Expand
Reference Sequence

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
MES Query on MES Download:Ideal Coordinates CCD File SDF format, chain G [auth B] MOL2 format, chain G [auth B] mmCIF format, chain G [auth B]	G [auth B]	2-(N-MORPHOLINO)-ETHANESULFONIC ACID C₆ H₁₃ N O₄ S SXGZJKUKBWWHRA-UHFFFAOYSA-N		Interactions Focus chain G [auth B] Interactions & Density Focus chain G [auth B]
GLA (Subject of Investigation/LOI) Query on GLA Download:Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain H [auth B] MOL2 format, chain C [auth A] MOL2 format, chain H [auth B] mmCIF format, chain C [auth A] mmCIF format, chain H [auth B]	C [auth A], H [auth B]	alpha-D-galactopyranose C₆ H₁₂ O₆ WQZGKKKJIJFFOK-PHYPRBDBSA-N		Interactions Focus chain C [auth A] Focus chain H [auth B] Interactions & Density Focus chain C [auth A] Focus chain H [auth B]
EDO Query on EDO Download:Ideal Coordinates CCD File SDF format, chain F [auth A] SDF format, chain E [auth A] SDF format, chain D [auth A] MOL2 format, chain F [auth A] MOL2 format, chain E [auth A] MOL2 format, chain D [auth A] mmCIF format, chain F [auth A] mmCIF format, chain E [auth A] mmCIF format, chain D [auth A]	D [auth A], E [auth A], F [auth A]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Interactions & Density Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A]