Abstract
The specific interaction of ganglioside GM1 with the homodimeric (prototype) endogenous lectin galectin-1 triggers growth regulation in tumor and activated effector T cells. This proven biorelevance directed interest to studying association of the lectin to a model surface, i.e. a 1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine/ganglioside GM1 (80: 20 mol%) monolayer, at a bioeffective concentration. Surface expansion by the lectin insertion was detected at a surface pressure of 20 mN/m. On combining the methods of grazing incidence X-ray diffraction and X-ray reflectivity, a transient decrease in lipid-ordered phase of the monolayer was observed. The measured electron density distribution indicated that galectin-1 is oriented with its long axis in the surface plane, ideal for cis-crosslinking. The data reveal a conspicuous difference to the way the pentameric lectin part of the cholera toxin, another GM1-specific lectin, is bound to the monolayer. They also encourage further efforts to monitor effects of structurally different members of the galectin family such as the functionally antagonistic chimera-type galectin-3.
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Abbreviations
- Ctx:
-
cholera toxin pentamer
- DPPE:
-
1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine
- Gal:
-
galectin
- GIXD:
-
grazing incidence X-ray diffraction
- LC phase:
-
lipid-condensed phase
- PSD:
-
position-sensitive detector
- XR:
-
X-ray reflectivity
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Published in Russian in Biokhimiya, 2015, Vol. 80, No. 7, pp. 1119-1134.
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Majewski, J., André, S., Jones, E. et al. X-ray reflectivity and grazing incidence diffraction studies of interaction between human adhesion/growth-regulatory galectin-1 and DPPE—GM1 lipid monolayer at an air/water interface. Biochemistry Moscow 80, 943–956 (2015). https://doi.org/10.1134/S0006297915070135
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DOI: https://doi.org/10.1134/S0006297915070135