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A peptide spectral library is a curated, annotated and non-redundant collection/database of LC-MS/MS peptide spectra. One essential utility of a peptide spectral library is to serve as consensus templates supporting the identification of peptides and proteins based on the correlation between the templates with experimental spectra.[citation needed]
One potential application of peptide spectral libraries is the identification of new, currently unknown mass spectra. Here, the spectra from the library are compared to the new spectra and if a match is found, the unknown spectra can be assigned the identity of the known peptide in the library.
Spectral libraries have been used in the small molecules mass spectra identification since the 1980s.[1] In the early years of shotgun proteomics, pioneer investigations suggested that a similar approach might be applicable in shotgun proteomics for peptide/protein identification.[2]
^Domokos, L., Hennberg, D., and Weimann, B. 1984. Computer-aided identification of compounds by comparison of mass spectra. Anal. Chim. Acta 165:61-74.
^Yates, J.R., 3rd, Morgan, S.F., Gatlin, C.L., Griffin, P.R., and Eng, J.K. 1998. Method to compare collision-induced dissociation spectra of peptides: Potential for library searching and subtractvie analysis. Anal. Chem., 70:3557-3565.
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