Abstract
Hydrated networks of glycans (polysaccharides)—in the form of cell walls, periplasms or gel-like matrices—are ubiquitously present adjacent to cellular plasma membranes1,2,3,4. Yet, despite their abundance, the function of glycans in the extracellular milieu is largely unknown5. Here we show that the spatial configuration of glycans controls the phase behaviour of multiphase model lipid membranes: inhomogeneous glycan networks stabilize large lipid domains at the characteristic length scale of the network, whereas homogeneous networks suppress macroscopic lipid phase separation. We also find that glycan-patterned phase separation is thermally reversible—thus indicating that the effect is thermodynamic rather than kinetic—and that phase patterning probably results from a preferential interaction of glycans with ordered lipid phases. These findings have implications for membrane-mediated transport processes6,7,8, potentially rationalize long-standing observations that differentiate the behaviour of native and model membranes9,10,11,12,13 and may indicate an intimate coupling between cellular lipidomes and glycomes.
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Acknowledgements
We thank the Harvard MRSEC (DMR-0820484), Harvard Center for Brain Science Imaging Facility, the Harvard Center for Nanoscale Systems, and Princeton University for partial support of this research. We also thank S. Lecuyer and M. Staykova for comments on the manuscript.
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A.B.S. made the initial observation of the effects of glycans on supported lipid membranes. H.A.S. and A.B.S. initiated research. A.B.S. designed and performed experiments and analysed data. A.B.S., G.G., V.N.M. and H.A.S. interpreted data and wrote the paper.
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Subramaniam, A., Guidotti, G., Manoharan, V. et al. Glycans pattern the phase behaviour of lipid membranes. Nature Mater 12, 128–133 (2013). https://doi.org/10.1038/nmat3492
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DOI: https://doi.org/10.1038/nmat3492