Pulsed electron spin resonance resolves the coordination site of Cu²(+) ions in α1-glycine receptor.
Pulsed electron spin resonance resolves the coordination site of Cu²(+) ions in α1-glycine receptor.
复制标题
脉冲电子自旋共振解决了α1-甘氨酸受体中Cu 2( ) 离子的配位位点。
DOI:
10.1016/j.bpj.2010.08.050
复制
发表时间:
2010
影响因子:
3.4
通讯作者:
Saxena,Sunil
中科院分区:
文献类型:
--
作者:
Ruthstein,Sharon;Stone,KatherineM;Cunningham,TimothyF;Ji,Ming;Cascio,Michael;Saxena,Sunil
Herein, we identify the coordination environment of Cu2+in the humanα1-glycine receptor (GlyR). GlyRs are members of the pentameric ligand-gated ion channel superfamily (pLGIC) that mediate fast signaling at synapses. Metal ions like Zn2+and Cu2+significantly modulate the activity of pLGICs, and metal ion coordination is essential for proper physiological postsynaptic inhibition by GlyR in vivo. Zn2+can either potentiate or inhibit GlyR activity depending on its concentration, while Cu2+is inhibitory. To better understand the molecular basis of the inhibitory effect we have used electron spin resonance to directly examine Cu2+coordination and stoichiometry. We show that Cu2+has one binding site perα1 subunit, and that five Cu2+can be coordinated per GlyR. Cu2+binds to E192 and H215 in each subunit of GlyR with a 40μM apparent dissociation constant, consistent with earlier functional measurements. However, the coordination site does not include several residues of the agonist/antagonist binding site that were previously suggested to have roles in Cu2+coordination by functional measurements. Intriguingly, the E192/H215 site has been proposed as the potentiating Zn2+site. The opposing modulatory actions of these cations at a shared binding site highlight the sensitive allosteric nature of GlyR.
登录
查看更多内容
影响因子:
2.9
作者:
Mills,DeniseA;Xu,Shujuan;Geren,Lois;Hiser,Carrie;Qin,Ling;Sharpe,MartynA;McCracken,John;Durham,Bill;Millett,Francis;Ferguson-Miller,Shelagh
通讯作者:
Ferguson-Miller,Shelagh
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
J. Fauth;A. Schweiger;L. Braunschweiler;J. Forrer;R. R. Ernst
通讯作者:
R. R. Ernst
影响因子:
2.9
作者:
Liu,Zhenyu;Ramanoudjame,Gomathi;Liu,Deqian;Fox,RobertO;Jayaraman,Vasanthi;Kurnikova,Maria;Cascio,Michael
通讯作者:
Cascio,Michael
影响因子:
2.9
作者:
Burns, CS;Aronoff-Spencer, E;Millhauser, GL
通讯作者:
Millhauser, GL
影响因子:
4.8
作者:
Nevin, ST;Cromer, BA;Lynch, JW
通讯作者:
Lynch, JW