6i5r

BlMnBP1 binding protein of an ABC transporter from Bifidobacterium animalis subsp. lactis ATCC27673 in complex with mannobiose

spinqualitylabelsall models 6i5r, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6i5r is a 1 chain structure with sequence from Bifidobacterium animalis subsp. animalis atcc 27673. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BMA, ZN Gene: blac_00780 (Bifidobacterium animalis subsp. animalis ATCC 27673) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Human gut bifidobacteria rely on ATP-binding cassette (ABC) transporters for oligosaccharide uptake. Multiple oligosaccharide-specific solute binding protein (SBP) genes are occasionally associated with a single ABC transporter, but the significance of this multiplicity remains unclear. Here, we characterize BlMnBP1 and BlMnBP2, the two SBPs associated to the beta-manno-oligosaccharide (MnOS) ABC transporter in Bifidobacterium animalis subsp. lactis. Despite similar overall specificity and preference to mannotriose (Kd approximately 80 nM), affinity of BlMnBP1 is up to 2570-fold higher for disaccharides than BlMnBP2. Structural analysis revealed a substitution of an asparagine that recognizes the mannosyl at position 2 in BlMnBP1, by a glycine in BlMnBP2, which affects substrate affinity. Both substitution-types occur in bifidobacterial SBPs, but BlMnBP1-like variants prevail in human-gut isolates. B. animalis subsp. lactis ATCC27673 showed growth on gluco- and galactomannans and was able to outcompete a mannan-degrading Bacteroides ovatus strain in co-cultures, attesting the efficiency of this ABC uptake system. By contrast, a strain that lacks this transporter failed to grow on mannan. This study highlights SBP diversification as a possible strategy to modulate oligosaccharide uptake preferences of bifidobacterial ABC-transporters during adaptation to specific ecological niches. Efficient metabolism of galactomannan by distinct bifidobacteria, merits evaluating this plant glycan as a potential prebiotic. This article is protected by copyright. All rights reserved. Two binding proteins of the ABC transporter that confers growth of Bifidobacterium animalis subsp. lactis ATCC27673 on beta-mannan possess distinct manno-oligosaccharide binding profiles.,Ejby M, Guskov A, Pichler MJ, Zanten GC, Schoof E, Saburi W, Slotboom DJ, Abou Hachem M Mol Microbiol. 2019 Apr 4. doi: 10.1111/mmi.14257. PMID:30947380 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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