Acetylcholinesterase clustering at the neuromuscular junction involves perlecan and dystroglycan.

Acetylcholinesterase clustering at the neuromuscular junction involves perlecan and dystroglycan.
复制标题

DOI:
10.1083/jcb.145.4.911
复制
发表时间:
1999-05-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rotundo RL
Rotundo RL
中科院分区:
其他
文献类型:
--
作者:
Peng HB;Xie H;Rossi SG;Rotundo RL

文献摘要

参考文献

被引文献

相似文献

脊椎动物神经肌肉接头处突触基底层的形成涉及许多专门的细胞外基质分子的积累,包括特定形式的乙酰胆碱酯酶(AChE),即胶原尾形式。负责其在神经肌肉接触部位定位的机制尚不清楚。为了了解突触 AChE 定位,我们合成了束蛋白 2 的荧光缀合物,束蛋白 2 是一种与催化亚基紧密结合的蛇 α-神经毒素。在非洲爪蟾肌肉细胞表面预标记 AChE 表明,预先存在的 AChE 分子可以被募集形成簇,与神经肌肉接触部位的乙酰胆碱受体共定位。同样,带有胶原蛋白样尾部的纯化禽类乙酰胆碱酯酶(AChE)在添加神经之前移植到非洲爪蟾肌肉细胞中时,也会在神经-肌肉接触部位积聚。使用外源禽 AChE 作为标记,我们发现该酶的胶原尾形式与硫酸乙酰肝素蛋白多糖基底膜聚糖结合,而基底膜聚糖又通过 α-肌营养不良聚糖与肌营养不良聚糖复合物结合。因此,肌营养不良聚糖-基底膜聚糖复合物充当 AChE 的细胞表面受体,使其能够通过膜平面内的横向迁移聚集在突触处。类似的机制可能是插入其他细胞类型之间的所有特化基底层的初始形成的基础。
Formation of the synaptic basal lamina at vertebrate neuromuscular junction involves the accumulation of numerous specialized extracellular matrix molecules including a specific form of acetylcholinesterase (AChE), the collagenic-tailed form. The mechanisms responsible for its localization at sites of nerve– muscle contact are not well understood. To understand synaptic AChE localization, we synthesized a fluorescent conjugate of fasciculin 2, a snake α-neurotoxin that tightly binds to the catalytic subunit. Prelabeling AChE on the surface of Xenopus muscle cells revealed that preexisting AChE molecules could be recruited to form clusters that colocalize with acetylcholine receptors at sites of nerve–muscle contact. Likewise, purified avian AChE with collagen-like tail, when transplanted to Xenopus muscle cells before the addition of nerves, also accumulated at sites of nerve–muscle contact. Using exogenous avian AChE as a marker, we show that the collagenic-tailed form of the enzyme binds to the heparan-sulfate proteoglycan perlecan, which in turn binds to the dystroglycan complex through α-dystroglycan. Therefore, the dystroglycan–perlecan complex serves as a cell surface acceptor for AChE, enabling it to be clustered at the synapse by lateral migration within the plane of the membrane. A similar mechanism may underlie the initial formation of all specialized basal lamina interposed between other cell types.
DOI: 10.1083/jcb.110.6.2061
发表时间: 1990-06
期刊: The Journal of cell biology
影响因子: --
作者:
Chen Q;Sealock R;Peng HB
通讯作者: Peng HB
DOI: 10.1113/jphysiol.1977.sp011880
发表时间: 1977-01-01
影响因子: 5.5
作者:
ANDERSON, MJ;COHEN, MW
通讯作者: COHEN, MW
DOI: 10.1016/s0092-8674(00)80533-4
发表时间: 1997-08-22
期刊: CELL
影响因子: 64.5
作者:
Grady, RM;Teng, HB;Sanes, JR
通讯作者: Sanes, JR
DOI: 10.1016/0092-8674(94)90051-5
发表时间: 1994-06-03
期刊: CELL
影响因子: 64.5
作者:
CAMPANELLI, JT;ROBERDS, SL;SCHELLER, RH
通讯作者: SCHELLER, RH
DOI: 10.1073/pnas.71.4.1376
发表时间: 1974-01-01
影响因子: 11.1
作者:
FERTUCK H C;SALPETER M M
通讯作者: SALPETER M M