Salt bridge interactions within the beta(2) integrin alpha(7) helix mediate force-induced binding and shear resistance ability

doi:10.1111/febs.14335

	Salt bridge interactions within the beta(2) integrin alpha(7) helix mediate force-induced binding and shear resistance ability
	Zhang X(张潇); Li LD ; Li N(李宁); Shu XY ; Zhou LW(周吕文); Lv SQ(吕守芹); Chen SB ; Mao DB; Long M(龙勉)
刊名	FEBS JOURNAL
	2018
卷号	285 期号:2 页码:261-274
关键词	beta(2) integrin allostery conformational stability force salt bridge interaction
ISSN号	1742-464X
DOI	10.1111/febs.14335
英文摘要	The functional performance of the alpha I domain alpha(7) helix in beta(2) integrin activation depends on the allostery of the alpha(7) helix, which axially slides down; therefore, it is critical to elucidate what factors regulate the allostery. In this study, we determined that there were two conservative salt bridge interaction pairs that constrain both the upper and bottom ends of the alpha(7) helix. Molecular dynamics (MD) simulations for three beta(2) integrin members, lymphocyte function-associated antigen-1 (LFA-1; alpha(L)beta(2)), macrophage-1 antigen (Mac-1; alpha(M)beta(2)) and alpha(x)beta(2), indicated that the magnitude of the salt bridge interaction is related to the stability of the alpha I domain and the strength of the corresponding force-induced allostery. The disruption of the salt bridge interaction, especially with double mutations in both salt bridges, significantly reduced the force-induced allostery time for all three members. The effects of salt bridge interactions of the alpha I domain alpha(7) helix on beta(2) integrin conformational stability and allostery were experimentally validated using Mac-1 constructs. The results demonstrated that salt bridge mutations did not alter the conformational state of Mac-1, but they did increase the force-induced ligand binding and shear resistance ability, which was consistent with MD simulations. This study offers new insight into the importance of salt bridge interaction constraints of the alpha I domain alpha(7) helix and external force for beta(2) integrin function.
分类号	二类/Q1
URL标识	查看原文
WOS关键词	I-DOMAIN ; A-DOMAIN ; LEUKOCYTE INTEGRIN ; CRYSTAL-STRUCTURE ; OUTSIDE-IN ; ACTIVATION ; LIGAND ; CONFORMATION ; ADHESION ; AFFINITY
WOS研究方向	Biochemistry & Molecular Biology
语种	英语
WOS记录号	WOS:000423416700005
资助机构	National Natural Science Foundation of China [31230027, 91642203, 11372332] ; National Key Research and Development Program of China [2016YFA0501601] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDB22040101]
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/77890]
专题	力学研究所_国家微重力实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Ctr Biomech & Bioengn, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Key Lab Micrograv, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Mech, Beijing Key Lab Engn Construct & Mechanobiol, Beijing, Peoples R China 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China 5.Chongqing Univ, Coll Bioengn, Chongqing, Peoples R China
推荐引用方式 GB/T 7714	Zhang X,Li LD,Li N,et al. Salt bridge interactions within the beta(2) integrin alpha(7) helix mediate force-induced binding and shear resistance ability[J]. FEBS JOURNAL,2018,285(2):261-274.
APA	张潇.,Li LD.,李宁.,Shu XY.,周吕文.,...&龙勉.(2018).Salt bridge interactions within the beta(2) integrin alpha(7) helix mediate force-induced binding and shear resistance ability.FEBS JOURNAL,285(2),261-274.
MLA	张潇,et al."Salt bridge interactions within the beta(2) integrin alpha(7) helix mediate force-induced binding and shear resistance ability".FEBS JOURNAL 285.2(2018):261-274.