Characterization of green fluorescent proteins by 193 nm ultraviolet photodissociation mass spectrometry.

Characterization of green fluorescent proteins by 193 nm ultraviolet photodissociation mass spectrometry.
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DOI:
10.1002/pmic.201300364
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发表时间:
2014-05
期刊:
影响因子:
3.4
通讯作者:
Brodbelt, Jennifer S.
Brodbelt, Jennifer S.
中科院分区:
生物学3区
文献类型:
--
作者:
Cannon, Joe R.;Kluwe, Christien;Ellington, Andrew;Brodbelt, Jennifer S.

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我们研究了193 nm紫外光解离(UVPD)的实用性相比,碰撞诱导解离(CID),更高的能量CID(HCD),和电子转移解离(ETD)的自上而下的高度同源的绿色荧光蛋白(GFP)在气相中的碎片。通过将表面残基突变为带电部分构建了几种GFP变体,证明了不同的等电点,并提出了质谱鉴定的挑战。提出的是一个比较的碎片化技术用于自上而下的表征四种变体与不同水平的表面电荷。相对于其他串联质谱(MS/MS)方法,UVPD始终导致更多碎片离子的鉴定,从而允许更高的置信度鉴定。除了大量的碎片离子之外,碎片化的位点更均匀地分布在整个蛋白质骨架中,这被证明是定位点突变的关键。
We investigate the utility of 193 nm ultraviolet photodissociation (UVPD) in comparison to collision induced dissociation (CID), higher energy CID (HCD), and electron transfer dissociation (ETD) for top down fragmentation of highly homologous green fluorescent proteins (GFP) in the gas phase. Several GFP variants were constructed via mutation of surface residues to charged moieties, demonstrating different isoelectric points and presenting a challenge for identification by mass spectroscopy. Presented is a comparison of fragmentation techniques utilized for top down characterization of four variants with varying levels of surface charge. UVPD consistently resulted in identification of more fragment ions relative to other tandem mass spectrometry (MS/MS) methods, allowing higher confidence identification. In addition to the high number of fragment ions, the sites of fragmentation were more evenly spread throughout the protein backbone, which proved key for localizing the point mutations.
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