Cell adhesion on a supported lipid bilayer(SLB) functionalized with ligand proteins is a widely-used cell-mimetic model for the study of the trans receptor-ligand interaction that mediates the adhesion, and has been s...Cell adhesion on a supported lipid bilayer(SLB) functionalized with ligand proteins is a widely-used cell-mimetic model for the study of the trans receptor-ligand interaction that mediates the adhesion, and has been shown to play an important role in unravelling the molecular players in cell adhesion. Experimental studies of such cell-SLB adhesion systems often assume that there is no cis interactions between the ligands. An important question remains whether the cis-interaction afects the trans receptor-ligand interaction. Using a statistical-mechanical model and Monte Carlo simulations with biologically relevant parameters, we find that the attractive cis-interaction of strength 1 kBT between adjacent ligands on the SLB can lead to an amplification of both the affinity and cooperativity of the receptor-ligand binding, thereby facilitating the phase separation within the adhering cell membrane. In contrast, the adhesion system is less sensitive to the repulsive cis-interaction between adjacent ligands on the SLB.Our results suggest that the ligand-ligand cis-interaction should be carefully considered in the cell-SLB adhesion experiments.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 11902327, 21973040, and 11972041)Youth Innovation Promotion Association of Chinese Academy of Sciences,Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB22040102)+1 种基金Fundamental Research Funds for the Central Universities (Grant No. 14380228)Shenzhen Science and Technology Innovation Committee (Grant Nos. JCYJ20200109150656717, and JCYJ20170818110613113)。
文摘Cell adhesion on a supported lipid bilayer(SLB) functionalized with ligand proteins is a widely-used cell-mimetic model for the study of the trans receptor-ligand interaction that mediates the adhesion, and has been shown to play an important role in unravelling the molecular players in cell adhesion. Experimental studies of such cell-SLB adhesion systems often assume that there is no cis interactions between the ligands. An important question remains whether the cis-interaction afects the trans receptor-ligand interaction. Using a statistical-mechanical model and Monte Carlo simulations with biologically relevant parameters, we find that the attractive cis-interaction of strength 1 kBT between adjacent ligands on the SLB can lead to an amplification of both the affinity and cooperativity of the receptor-ligand binding, thereby facilitating the phase separation within the adhering cell membrane. In contrast, the adhesion system is less sensitive to the repulsive cis-interaction between adjacent ligands on the SLB.Our results suggest that the ligand-ligand cis-interaction should be carefully considered in the cell-SLB adhesion experiments.
