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Structural Insight into Multivalent Galactoside Binding to Pseudomonas aeruginosa Lectin LecA
Ricardo Visini1, Xian Jin1, Myriam Bergmann1
1Department of Chemistry and Biochemistry, University of Berne , Freiestrasse 3, 3012 Berne, Switzerland.
ACS Chemical Biology
|August 22, 2015
Summary
Multivalent galactosides can inhibit Pseudomonas aeruginosa biofilms. Lectin aggregation, facilitated by multivalent glycoclusters like GalAG2, is crucial for effective biofilm inhibition, offering a novel control strategy.
Area of Science:
- Carbohydrate Chemistry
- Structural Biology
- Microbiology
Background:
- Pseudomonas aeruginosa biofilms pose significant challenges in healthcare settings.
- Lectin LecA is a key target for inhibiting P. aeruginosa.
- Multivalent galactosides are explored for their anti-biofilm potential.
Discussion:
- Crystal structures reveal diverse binding modes of galactosides to LecA.
- Chelate binding and lectin cross-linking are key interactions.
- Modeling provides insights into tight binding and aggregation mechanisms.
Key Insights:
- Tetravalent GalAG2 exhibits exceptionally tight LecA binding (KD = 2.5 nM).
- Lectin aggregation, induced by multivalent inhibitors, is essential for biofilm inhibition.
- Divalent inhibitors show weak biofilm inhibition, highlighting the importance of multivalency.
Outlook:
- Multivalent glycoclusters represent a promising strategy for controlling P. aeruginosa biofilms.
- Further research into structure-activity relationships can optimize inhibitor design.
- Targeting LecA through multivalent interactions offers a unique therapeutic avenue.
