Selective dye and ionic permeability of gap junction channels formed by connexin45.
Selective dye and ionic permeability of gap junction channels formed by connexin45.
复制标题
Connexin45 形成的间隙连接通道的选择性染料和离子渗透性。
DOI:
10.1161/01.res.75.3.483
复制
发表时间:
1994
影响因子:
20.1
通讯作者:
Brink,PR
中科院分区:
文献类型:
--
作者:
Veenstra,RD;Wang,HZ;Beyer,EC;Brink,PR
Gap junctions are thought to mediate the direct intercellular coupling of adjacent cells by the gating of an aqueous pore permeable to ions and molecules of up to 1 kD or 8 to 14 A in diameter. We performed ion-substitution and dye-transfer experiments to determine the relative Cl-/K+ conductance and dye permeability of anionic fluorescein derivatives in chick connexin45 (Cx45) channels. We demonstrate that Cx45 forms a 26 +/- 6-picosiemen (pS) channel with a maximum detectable Cl- permeability of 0.2 relative to K+ or Cs+. Although homogeneous channel conductances were observed in multichannel recordings, the open probability estimates were indicative of nonhomogeneous gating behavior and occasional cooperativity. A second conductance state of 19 +/- 4 pS begins to predominate at higher voltages. Cx45 gap junctions are permeable to 2',7'-dichlorofluorescein but are not permeable to the more polar 6-carboxyfluorescein dye. These observations suggest that the Cx45 pore diameter is approximately 10 A and is associated with a fixed negative charge within the junctional channel.
登录
查看更多内容
DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Rup,DM;Veenstra,RD;Wang,HZ;Brink,PR;Beyer,EC
通讯作者:
Beyer,EC
影响因子:
3.4
作者:
Ramanan,SV;Brink,PR
通讯作者:
Brink,PR
DOI:
--
发表时间:
1989
影响因子:
11.1
作者:
R. Werner;ERic LEVINEt;C. Rabadán;Gerhard DAHLt
通讯作者:
Gerhard DAHLt
DOI:
10.1007/bf00232672
发表时间:
1994
期刊:
The Journal of membrane biology
影响因子:
--
作者:
Laing,JG;Westphale,EM;Engelmann,GL;Beyer,EC
通讯作者:
Beyer,EC
影响因子:
3.4
作者:
Moreno,AP;Eghbali,B;Spray,DC
通讯作者:
Spray,DC