Selective dye and ionic permeability of gap junction channels formed by connexin45.

Selective dye and ionic permeability of gap junction channels formed by connexin45.
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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
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发表时间:
1994
影响因子:
20.1
通讯作者:
Brink,PR
Brink,PR
中科院分区:
医学1区
文献类型:
--
作者:
Veenstra,RD;Wang,HZ;Beyer,EC;Brink,PR

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缝隙连接被认为通过门控可渗透直径高达1 kD或8至14 A的离子和分子的水孔来介导相邻细胞的直接细胞间偶联。我们进行了离子取代和染料转移实验,以确定相对Cl-/K+电导和染料渗透性的阴离子荧光素衍生物在鸡连接蛋白45(Cx45)通道。我们证明,Cx45形成了一个26 +/- 6-pS(pS)通道,最大可检测的Cl-渗透性为0.2相对于K+或Cs+。虽然在多通道记录中观察到均匀通道电导,但开放概率估计值表明非均匀门控行为和偶尔的协同性。19 +/-4 pS的第二电导状态在较高电压下开始占主导地位。Cx45间隙连接对2 ',7'-二氯荧光素是可渗透的,但对极性更大的6-羧基荧光素染料是不可渗透的。这些观察结果表明,Cx45孔径约为10 A,并与连接通道内的固定负电荷相关。
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.
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
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发表时间: 1993
影响因子: 3.4
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DOI: 10.1007/bf00232672
发表时间: 1994
期刊: The Journal of membrane biology
影响因子: --
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DOI: 10.1016/s0006-3495(91)82159-2
发表时间: 1991
影响因子: 3.4
作者:
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通讯作者: Spray,DC