Characterization of the junctional face membrane from terminal cisternae of sarcoplasmic reticulum.

Characterization of the junctional face membrane from terminal cisternae of sarcoplasmic reticulum.
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肌质网的末端水箱的连接式面膜的表征。

DOI:
10.1083/jcb.103.3.741
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发表时间:
1986-09
影响因子:
7.8
通讯作者:
FLEISCHER, S
FLEISCHER, S
中科院分区:
生物学1区
文献类型:
--
作者:
COSTELLO, B;CHADWICK, C;SAITO, A;CHU, A;MAURER, A;FLEISCHER, S

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我们最近描述了从兔后腿快速骨骼肌中制备连接终末池(JTC)的方法。该级分与其他重肌浆网 (SR) 级分的不同之处在于,它含有大量的交界面膜 (JFM)(膜的 15-20%),具有形态学上明确的交界足结构。与其他重缓释制剂一样,它主要含有钙泵膜(膜的 80-85%)和区室内容物 (CC),主要由钙结合蛋白(钙螯合蛋白)组成。在本研究中,描述了从冷冻兔背部肌肉中制备 JTC 的改进程序。产量显着提高(肌肉重量的三倍),但保留了与新鲜后腿肌肉的 JTC 相似的特性。 JTC 的拆卸方法已经开发出来。这是通过在 1 mM CaCl2 存在下用 0.5% Triton X-100 选择性提取钙泵膜来实现的,以产生 JFM 与 CC 的复合物。然后,CC 在 EDTA 存在下溶解,生成 JFM。该部分包含从膜的细胞质面突出的单向排列的连接脚结构,其重复间距与 JTC 中观察到的相当。 JFM 每毫克蛋白质含有 0.16 微摩尔磷(脂质)。特征性蛋白质包括 340 和 79 kD 条带、28 kD 的双联体以及迁移速度稍慢于或相当于钙泵蛋白的组分。 EDTA 提取后,大约 10% 的钙结合蛋白仍与 JFM 结合,表明 JFM 中存在特定的结合成分。 JFM 参与与横管的连接关联,并且可能参与兴奋-收缩耦合中的 Ca2+ 释放过程,现已在试管中使用。
We have recently described a preparation of junctional terminal cisternae (JTC) from fast skeletal muscle of rabbit hind leg. The fraction differs from other heavy sarcoplasmic reticulum (SR) fractions in that it contains a substantial amount of junctional face membrane (JFM) (15-20% of the membrane) with morphologically well-defined junctional feet structures. In common with other heavy SR preparations, it contains predominantly the calcium pump membrane (80-85% of the membrane) and compartmental contents (CC), consisting mainly of calcium- binding protein (calsequestrin). In this study, a modified procedure for the preparation of JTC from frozen rabbit back muscle is described. The yield is substantially greater (threefold per weight of muscle), yet retaining characteristics similar to JTC from fresh hind leg muscles. Methodology has been developed for the disassembly of the JTC. This is achieved by selectively extracting the calcium pump membrane with 0.5% Triton X-100 in the presence of 1 mM CaCl2 to yield a complex of JFM with CC. The CC are then solubilized in the presence of EDTA to yield JFM. This fraction contains unidirectionally aligned junctional feet structures protruding from the cytoplasmic face of the membrane with repeat spacings comparable to that observed in JTC. The JFM contains 0.16 mumol phosphorus (lipid) per milligram protein. Characteristic proteins include 340 and 79-kD bands, a doublet at 28 kD, and a component that migrates somewhat slower than or equivalent to the calcium pump protein. Approximately 10% of the calcium-binding protein remains bound to the JFM after EDTA extraction, indicating the presence of a specific binding component in the JFM. The JFM, which is involved in junctional association with transverse tubule and likely in the Ca2+ release process in excitation-contraction coupling, is now available in the test tube.
DOI: 10.1007/bf01871994
发表时间: 1978-01-01
影响因子: 2.4
作者:
KOMETANI, T;KASAI, M
通讯作者: KASAI, M
DOI: 10.1083/jcb.96.4.1017
发表时间: 1983-04
期刊: The Journal of cell biology
影响因子: --
作者:
Mitchell RD;Saito A;Palade P;Fleischer S
通讯作者: Fleischer S
DOI: 10.1083/jcb.32.1.193
发表时间: 1967-01
期刊: The Journal of cell biology
影响因子: --
作者:
Fleischer S;Fleischer B;Stoeckenius W
通讯作者: Stoeckenius W
DOI: 10.1007/bf00712033
发表时间: 1983-01-01
影响因子: 2.7
作者:
FRANZINIARMSTRONG, C;NUNZI, G
通讯作者: NUNZI, G
DOI: 10.1073/pnas.82.12.4036
发表时间: 1985-01-01
影响因子: 11.1
作者:
MAURER, A;TANAKA, M;FLEISCHER, S
通讯作者: FLEISCHER, S