Method for screening peptide fragment ion mass spectra prior to database searching.
A methodology is described for screening fragment ion spectra of peptides prior to database searching for protein identification. A software routine written in the Perl programming language was used to analyze data from previous Sequest database searches and develop a set of statistical descriptors that could be used to identify spectra not likely to yield useful results in a database search. A second Perl program used an evolutionary algorithm to optimize the criteria for each statistical descriptor and generate a formula for determining spectral quality. This formula was used by a third Perl program to screen data sets from four independent liquid chromatography tandem mass spectrometry runs. On the average, use of the screening program reduced the time required for a database search by 1/2 with little loss of useful information from the database search results.
Moore
R E
RE
Beckman Research Institute of the City of Hope, Duarte, California 91010, USA.
Young
M K
MK
Lee
T D
TD
D000465:Algorithms; D016208:Databases, Factual; D010450:Endopeptidases; D006868:Hydrolysis; D013058:Mass Spectrometry; D019151:Peptide Library; D010455:Peptides / Q000737:chemistry*; D012984:Software; D014357:Trypsin
D019151:Peptide Library; D010455:Peptides; D010450:Endopeptidases; D014357:Trypsin