來(lái)自美國(guó)克里普斯研究院(The Scripps Research Institute,,TSRI)Skaggs生物化學(xué)與化學(xué)生理學(xué)研究所(Skaggs Institute for Chemical Biology and Department of Chemical Physiology)的研究人員不僅在世界上率先展開了蛋白質(zhì)活性表達(dá)譜(activity-based protein profiling, ABPP)的繪制工作,而且在最新的一期(8月22日)的Cell雜志上公布了一個(gè)全面的,,有效的蛋白質(zhì)組學(xué)研究平臺(tái),,可以直接觀察到蛋白水解全部過(guò)程,,研究人員利用這一技術(shù)獲得了由天然細(xì)胞凋亡途徑誘導(dǎo)的蛋白質(zhì)組范圍內(nèi)的蛋白水解事件的圖譜。
領(lǐng)導(dǎo)這一研究的是Skaggs生物化學(xué)與化學(xué)生理學(xué)研究所的Benjamin F.Cravatt,,他曾獲得2005年美國(guó)化學(xué)會(huì)國(guó)家獎(jiǎng),,是一位著名的蛋白研究專家,其研究小組在世界上率先開展了蛋白質(zhì)活性表達(dá)譜的繪制工作,,這一工作的完成將對(duì)蛋白酶作用底物的尋找起到巨大的推動(dòng)作用,。
蛋白水解(Proteolysis)即蛋白質(zhì)的肋鍵水解,,是指蛋白質(zhì)在酶等催化劑作用下可以水解,,生成氨基酸的過(guò)程,。這個(gè)過(guò)程對(duì)于蛋白的激活(失活),轉(zhuǎn)移,, 以及降解意義重點(diǎn),,是一個(gè)關(guān)鍵的調(diào)控過(guò)程。
目前在尋找能全面描述生物系統(tǒng)中蛋白水解途徑的方法方面是一個(gè)研究熱點(diǎn),,在這篇文章中,,研究人員發(fā)展了一種有效全面的蛋白質(zhì)組學(xué)研究平臺(tái),利用這一方法能直接的,,從全局上觀察蛋白水解事件,。并且研究人員也利用這一技術(shù)獲得了由天然細(xì)胞凋亡途徑誘導(dǎo)的蛋白質(zhì)組范圍內(nèi)的蛋白水解事件的圖譜。
這張圖譜包含了91個(gè)caspase底物,,170個(gè)之前未知的細(xì)胞凋亡過(guò)程中分解的蛋白,,而且令人驚訝的是,蛋白水解蛋白中的大部分,,盡管已經(jīng)進(jìn)行了分解,,仍然存在一些離散的蛋白結(jié)構(gòu)域,這說(shuō)明活性效應(yīng)蛋白的生成也許是凋亡蛋白水解級(jí)聯(lián)(apoptotic proteolytic cascades)的一個(gè)主要功能,。(生物谷Bioon.com)
生物谷推薦原始出處:
Cell, Vol 134, 679-691, 22 August 2008
Global Mapping of the Topography and Magnitude of Proteolytic Events in Apoptosisp679
Melissa M. Dix, Gabriel M. Simon, and Benjamin F. Cravatt
The Skaggs Institute for Chemical Biology and Department of Chemical Physiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
Proteolysis is a key regulatory process that promotes the (in)activation, translocation, and/or degradation of proteins. As such, there is considerable interest in methods to comprehensively characterize proteolytic pathways in biological systems. Here, we describe a robust and versatile proteomic platform that enables direct visualization of the topography and magnitude of proteolytic events on a global scale. We use this method to generate a proteome-wide map of proteolytic events induced by the intrinsic apoptotic pathway. This profile contained 91 characterized caspase substrates as well as 170 additional proteins not previously known to be cleaved during apoptosis. Surprisingly, the vast majority of proteolyzed proteins, regardless of the extent of cleavage, yielded persistent fragments that correspond to discrete protein domains, suggesting that the generation of active effector proteins may be a principal function of apoptotic proteolytic cascades.