Post-acquisition ETD spectral processing for increased peptide identifications.
Post-acquisition ETD spectral processing for increased peptide identifications.
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DOI:
10.1016/j.jasms.2009.03.006
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发表时间:
2009-08
影响因子:
3.2
通讯作者:
Coon JJ
中科院分区:
文献类型:
--
作者:
Good DM;Wenger CD;McAlister GC;Bai DL;Hunt DF;Coon JJ
Tandem mass spectra (MS/MS) produced using electron transfer dissociation (ETD) differ from those derived from collision-activated dissociation (CAD) in several important ways. Foremost, the predominant fragment ion series are different: c-and z•-type ions are favored in ETD spectra while b-and y-type ions comprise the bulk of the CAD spectra. Additionally, ETD spectra possess specific neutral losses and charge-reduced precursors . Most database search algorithms were designed to analyze CAD spectra, and have only recently been adapted to accomodate c-and z•-ions; however, inclusion of these additional spectral features can hinder identification, leading to lower confidence scores and decreased sensitivity. Therefore, it is important to pre-process spectral data prior to submission to a database search to remove those features which cause complications. Here, we demonstrate the effect of removing these features on the number of identifications at a 1% false discovery rate (FDR) using the open mass spectrometry search algorithm (OMSSA). When analyzing two biological replicates of a yeast protein extract in three total analyses, the number of identifications with a ~1% FDR increased from ~4611 to ~5931 upon spectral pre-processing – an increase of ~28.6%. We outline the most effective pre-processing methods, and provide free software containing these algorithms.
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影响因子:
4.4
作者:
McAlister, Graeme C.;Berggren, W. Travis;Griep-Raming, Jens;Horning, Stevan;Makarov, Alexander;Phanstiel, Doug;Stafford, George;Swaney, Danielle L.;Syka, John E. P.;Zabrouskov, Vlad;Coon, Joshua J.
通讯作者:
Coon, Joshua J.
DOI:
10.1073/pnas.0607084104
发表时间:
2007-02-13
影响因子:
11.1
作者:
Chi, An;Huttenhower, Curtis;Hunt, Donald F.
通讯作者:
Hunt, Donald F.
DOI:
10.1073/pnas.0611217104
发表时间:
2007-02-13
影响因子:
11.1
作者:
Molina, Henrik;Horn, David M.;Pandey, Akhilesh
通讯作者:
Pandey, Akhilesh
DOI:
10.1016/s1044-0305(01)00357-9
发表时间:
2002-03-01
影响因子:
3.2
作者:
Cooper, HJ;Hudgins, RR;Marshall, AG
通讯作者:
Marshall, AG
影响因子:
7.4
作者:
Martin, SE;Shabanowitz, J;Marto, JA
通讯作者:
Marto, JA