SMD simulations of shear loading induced dissociation of P-selectin/PSGL-1 complex

	SMD simulations of shear loading induced dissociation of P-selectin/PSGL-1 complex
	Ren P; Lv SQ(吕守芹); Kang YY(康英永); Huo B(霍波); Long M(龙勉)
	2009
会议名称	3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009
会议日期	June 11, 2009 - June 13, 2009
会议地点	Beijing, China
关键词	Atomic levels Blood cells Dissociation process Flow direction Functional units Inclination angles Induced dissociation LEC Molecular complexes Molecular mechanism Rolling process Selectin Selectins Shear fields Shear loadings Shear velocities Simulation result Structural basis Water molecule
通讯作者	Long, M. (mlong@imech.ac.cn)
中文摘要	Selectin/ligand interactions mediate the tethering and rolling processes of blood cells on vascular surfaces. It has been demonstrated that flow is required during this adhesion process. But the molecular mechanism, e.g. how the shear loading from the hydrodynamic environment of the circulation influences the rupture of selectin/ligand complex, is still unclear. In this study, we simulated the dissociation process of P-selectin/PSGL-1 complex under shear loading at the atomic level. The shear field was established by stretching the top layer of water molecules using SMD method. The dynamic evolvement of microstructure of P-LE/SGP-3 complex, the minimal functional unit of P-selectin/ PSGL-1 complex, for different shear velocity was studied. The simulation results indicated that the extension in PLE occurred before the dissociation of P-LE/SGP-3 complex. During the dissociation process, two anti-parallel β-sheets in EGF and hydrogen bonds at the interface of EGF-Lec domains were broken, but the structure of Lec domain remained unchanged. Under the same initial inclination angle of molecular complex relative to flow direction, structural destruction time decreased but dissociation speed of the complex increased along with the increase of shear velocity. For the same shear velocity, the dissociation of the complex was speeded up when decreasing the initial inclination angle. This work provide a insight into understand the structural bases for the rupture of P-selectin/ PSGL-1 bond at atomic level. ©2009 IEEE.
收录类别	CPCI-S ; EI
会议网址	10.1109/ICBBE.2009.5163407
会议录	3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009
语种	英语
ISBN号	9781424429028
WOS记录号	WOS:000286342800183
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/60473]
专题	力学研究所_国家微重力实验室
推荐引用方式 GB/T 7714	Ren P,Lv SQ,Kang YY,et al. SMD simulations of shear loading induced dissociation of P-selectin/PSGL-1 complex[C]. 见:3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009. Beijing, China. June 11, 2009 - June 13, 2009.10.1109/ICBBE.2009.5163407.