8YK2

Experimental Data Snapshot

wwPDB Validation 3D Report Full Report

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

Literature

(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

1 Department of Biotechnology, The University of Tokyo.

Macromolecule Content

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha-galactosidase	A [auth B], B [auth A]	700	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% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	L8B3G2
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
SO4 Query on SO4 Download Ideal Coordinates CCD File SDF format, chain F [auth A] MOL2 format, chain F [auth A] mmCIF format, chain F [auth A]	F [auth A]	SULFATE ION O₄ S QAOWNCQODCNURD-UHFFFAOYSA-L		Interactions Focus chain F [auth A] Interactions & Density Focus chain F [auth A]
GOL Query on GOL Download Ideal Coordinates CCD File SDF format, chain C [auth B] SDF format, chain D [auth B] SDF format, chain E [auth B] MOL2 format, chain C [auth B] MOL2 format, chain D [auth B] MOL2 format, chain E [auth B] mmCIF format, chain C [auth B] mmCIF format, chain D [auth B] mmCIF format, chain E [auth B]	C [auth B], D [auth B], E [auth B]	GLYCEROL C₃ H₈ O₃ PEDCQBHIVMGVHV-UHFFFAOYSA-N		Interactions Focus chain C [auth B] Focus chain D [auth B] Focus chain E [auth B] Interactions & Density Focus chain C [auth B] Focus chain D [auth B] Focus chain E [auth B]
NA Query on NA Download Ideal Coordinates CCD File SDF format, chain G [auth A] MOL2 format, chain G [auth A] mmCIF format, chain G [auth A]	G [auth A]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N		Interactions Focus chain G [auth A] Interactions & Density Focus chain G [auth A]