Bassoon, a novel zinc-finger CAG/glutamine-repeat protein selectively localized at the active zone of presynaptic nerve terminals.

Bassoon, a novel zinc-finger CAG/glutamine-repeat protein selectively localized at the active zone of presynaptic nerve terminals.
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巴松管是一种新型的锌指CAG/谷氨酰胺重复蛋白,选择性地定位于突触前神经末端的活性区域。

DOI:
10.1083/jcb.142.2.499
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发表时间:
1998-07-27
影响因子:
7.8
通讯作者:
Gundelfinger, ED
Gundelfinger, ED
中科院分区:
生物学1区
文献类型:
--
作者:
Dieck, ST;Sanmartí-Vila, L;Langnaese, K;Richter, K;Kindler, S;Soyke, A;Wex, H;Smalla, KH;Kämpf, U;Fränzer, JT;Stumm, M;Garner, CC;Gundelfinger, ED

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突触前神经末梢的细胞线的分子结构知之甚少。在这里,我们展示了一种新的蛋白质Bason,它是一种新的突触前细胞骨架成分。小鼠巴松管基因定位于染色体9F。与相应的大鼠cDNA进行比较,确定了其蛋白编码区的10个外显子。据预测,Bason蛋白含有两个双锌指,几个卷曲的结构域,以及一段多谷氨酰胺(在大鼠和小鼠中分别为24和11个残基)。在一些人类蛋白质中,例如亨廷顿蛋白,这种多谷氨酰胺区域的异常放大会导致迟发性神经变性。巴松管富含突触蛋白。在培养的海马神经元中,巴松管与突触小泡蛋白突触素和突触前细胞基质成分Piccolo共定位。在超微结构水平上,在海马神经元的轴突终末检测到巴松管,它高度集中在活动区附近。突触小体的免疫金标记法显示,Bason与穿插在透明突触小泡之间的物质有关,生化研究表明与细胞骨架结构密切相关。这些数据表明,Bason是一个很有可能参与神经递质释放部位的细胞基质组织的候选基因。
The molecular architecture of the cytomatrix of presynaptic nerve terminals is poorly understood. Here we show that Bassoon, a novel protein of >400,000 M r, is a new component of the presynaptic cytoskeleton. The murine bassoon gene maps to chromosome 9F. A comparison with the corresponding rat cDNA identified 10 exons within its protein-coding region. The Bassoon protein is predicted to contain two double-zinc fingers, several coiled-coil domains, and a stretch of polyglutamines (24 and 11 residues in rat and mouse, respectively). In some human proteins, e.g., Huntingtin, abnormal amplification of such poly-glutamine regions causes late-onset neurodegeneration. Bassoon is highly enriched in synaptic protein preparations. In cultured hippocampal neurons, Bassoon colocalizes with the synaptic vesicle protein synaptophysin and Piccolo, a presynaptic cytomatrix component. At the ultrastructural level, Bassoon is detected in axon terminals of hippocampal neurons where it is highly concentrated in the vicinity of the active zone. Immunogold labeling of synaptosomes revealed that Bassoon is associated with material interspersed between clear synaptic vesicles, and biochemical studies suggest a tight association with cytoskeletal structures. These data indicate that Bassoon is a strong candidate to be involved in cytomatrix organization at the site of neurotransmitter release.
RBSEC1A和B与语法1和SNAP-25共同定位,但在整个轴突中都不是与语法素一起稳定的复合物。
DOI: 10.1083/jcb.129.1.105
发表时间: 1995-04
期刊: The Journal of cell biology
影响因子: --
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