Infrared Spectroscopy of Fragments from Doubly Protonated Tryptic Peptides
Infrared Spectroscopy of Fragments from Doubly Protonated Tryptic Peptides
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DOI:
10.1002/cphc.200800804
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发表时间:
2009-04-14
期刊:
影响因子:
2.9
通讯作者:
Maitre, Philippe
中科院分区:
文献类型:
--
作者:
Bythell, Benjamin J.;Erlekam, Undine;Maitre, Philippe
Most proteins in proteomicsare identified from tandem mass spectra of doubly protonated tryptic peptides. Statistical studies indicate that these spectra fall into two distinct classes. IR spectroscopy experiments and DFT calculations performed on modelb2ions show that peptides producing Class I spectra form protonated oxazolone ions (see figure) and not protonated diketopiperazines as proposed elsewhere.