Peptide photodissociation with 157 nm light in a commercial tandem time-of-flight mass spectrometer.

Peptide photodissociation with 157 nm light in a commercial tandem time-of-flight mass spectrometer.
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DOI:
10.1021/ac9012557
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发表时间:
2009-09-15
影响因子:
7.4
通讯作者:
Reilly, James P.
Reilly, James P.
中科院分区:
化学1区
文献类型:
--
作者:
Zhang, Liangyi;Reilly, James P.

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在ABI4700型基质辅助激光解吸电离(MALDI)串联飞行时间(TOF)质谱仪上实现了157 nm光解离。利用自制的计算机程序,根据每个前体离子的m/z来控制光的计时,光解设置与质谱仪无缝地自动进行。在这个装置中,多肽的光解产生了类似于以前用自制串列飞行时间质谱仪观察到的片段。C端含有精氨酸的多肽产生高能的x、v和w型片段,而N端含有精氨酸的多肽产生许多a和d型离子。还产生了丰富的免疫离子。获得了高质量的光解离光谱,其多肽含量仅为5fmoL。在各种胰多肽的分析中,光解提供了比传统的TOF-TOF CID更多的序列信息。因为有很高的碎裂效率,所以不会牺牲灵敏度。
Photodissociation with 157 nm light was implemented in an ABI model 4700 matrix-assisted laser desorption ionization (MALDI) tandem time-of-flight (TOF) mass spectrometer for peptide analysis. With a homemade computer program to control the light timing based on the m/z of each precursor ion, the photodissociation setup was seamlessly automated with the mass spectrometer. Peptide photodissociation in this apparatus yielded fragments similar to those observed in previous experiments with a homebuilt tandem-TOF mass spectrometer. Peptides having arginine at their C-termini yielded high-energy x-, v- and w- type fragments while peptides with N-terminal arginine produced many a- and d- type ions. Abundant immonium ions were also generated. High-quality photodissociation spectra were obtained with as little as 5 fmol of peptides. In the analysis of various tryptic peptides, photodissociation provided much more sequence information than the conventional TOF-TOF CID. Because of the high fragmentation efficiency, sensitivity was not sacrificed to achieve this.
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