标题: Bcl-w buries its tail, lets cell die [打印本页] 作者: 杨柳 时间: 2009-3-6 00:52 标题: Bcl-w buries its tail, lets cell die
Cells contemplate suicide by monitoring the opposing signals of pro-apoptotic and pro-survival members of the Bcl-2 protein family, but how are the pro-survival signals turned off when a cell initiates apoptosis? On page 877, Wilson-Annan et al. report that one pro-apoptotic signal causes Bcl-w, a pro-survival Bcl-2 protein, to stick itself into a membrane and become inert.Bcl-2 is an integral membrane protein, so it has long been assumed that its close relatives are also membrane integrated. However, the authors found that in healthy cells Bcl-w only associates loosely with membranes. Inducing apoptosis, however, causes Bcl-w to integrate into the mitochondrial membrane, an effect that is mimicked in cell lysates treated with a peptide from a BH3-only pro-apoptotic protein. Chimeric proteins with a BH3 domain attached to the NH2 terminus of Bcl-w also integrate into membranes. Membrane-bound Bcl-w does not become pro-apoptotic, but it loses its pro-survival activity.( n2 w' c& n' q3 \7 u8 o
% n6 M" Y1 h0 z7 r; NThese results, and the recently solved structure of Bcl-w, suggest that Bcl-w normally keeps its hydrophobic COOH terminus folded into a groove on its surface. Binding to a BH3-only protein releases the COOH terminus, which then inserts into a membrane and neutralizes the pro-survival activity of Bcl-w. Unpublished data support a similar type of regulation for the pro-apoptotic protein Bcl-xL.(Bcl-w in dying cells buries its tail, pe)作者: haha3245 时间: 2015-5-30 12:10
干细胞之家是国内最好的干细胞网站了 作者: yukun 时间: 2015-6-6 10:55
干细胞与动物克隆 作者: MIYAGI 时间: 2015-6-14 15:18
呵呵,明白了 作者: 张佳 时间: 2015-7-9 17:09
我等你哟! 作者: 昕昕 时间: 2015-7-13 19:19
希望大家都有好运 作者: 兔兔 时间: 2015-7-24 13:35
呵呵 大家好奇嘛 来观看下~~~~ 作者: sky蓝 时间: 2015-7-24 14:55
一定要回贴,因为我是文明人哦 作者: 兔兔 时间: 2015-8-3 08:01
勤奋真能造就财富吗? 作者: nauticus 时间: 2015-8-11 21:00
人之所以能,是相信能。 作者: 依旧随遇而安 时间: 2015-8-16 22:08
呵呵 大家好奇嘛 来观看下~~~~ 作者: 陈晴 时间: 2015-8-17 00:14
佩服佩服啊. 作者: 泡泡鱼 时间: 2015-8-17 09:01
HOHO~~~~~~ 作者: txxxtyq 时间: 2015-8-18 08:15
谁都不容易啊 ~~ 作者: 依旧随遇而安 时间: 2015-9-9 19:10
加油啊!偶一定会追随你左右,偶坚定此贴必然会起到抛砖引玉的作用~ 作者: tempo 时间: 2015-9-17 17:41