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Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
Published on: October 31, 2015
The specificity of frutalin lectin using biomembrane models.
Thatyane M Nobre1, Felippe J Pavinatto, Márcia R Cominetti
1Grupo de Biofísica Molecular Sérgio Mascarenhas, IFSC, Universidade de São Paulo, São Carlos, SP, Brazil. thatty@ursa.ifsc.usp.br
Biochimica Et Biophysica Acta
|April 1, 2010
Summary
Frutalin lectin specifically binds to galactose on cell surfaces. This interaction causes lipid rearrangements and domain formation, potentially revealing how lectins interact with cell membranes.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- Lectins are proteins that bind carbohydrates.
- Frutalin is a lectin that binds alpha-d-galactose (d-Gal).
- Lectins stimulate lymphocytes and leukocyte migration, but their cell surface interaction mechanisms require further elucidation.
Purpose of the Study:
- To investigate the interaction of frutalin with specific membrane lipids.
- To model biomembrane interactions using Langmuir monolayers.
- To understand the molecular mechanisms of lectin-cell surface interactions.
Main Methods:
- Utilized Langmuir monolayers as biomembrane models.
- Studied the adsorption of frutalin onto various phospho- and glycolipid monolayers.
- Analyzed lipid monolayer rearrangements and domain formation in the presence of frutalin.
Main Results:
- Confirmed frutalin's specific binding to d-Gal on biomembranes.
- Observed efficient frutalin adsorption to galactose polar head lipids, with a lag time for sulfated galactose.
- Demonstrated frutalin-induced lipid clusterization and domain formation in galactocerebroside mixtures.
Conclusions:
- Frutalin exhibits specificity for d-Gal on cell surfaces.
- Lectin-induced lipid domain formation may be linked to receptor internalization.
- Provides novel insights into the molecular mechanisms of lectin-cell surface interactions.
