PuSH - Publication Server of Helmholtz Zentrum München: PAS-cal: A repetitive peptide sequence calibration standard for MALDI mass spectrometry.

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Maier, S.K. ; Bashkueva, K.* ; Rösli, C.* ; Skerra, A.* ; Kuster, B.*

PAS-cal: A repetitive peptide sequence calibration standard for MALDI mass spectrometry.

Proteomics 14, 2427-2431 (2014)

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Open Access Green as soon as Postprint is submitted to ZB.

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Mass spectrometers equipped with matrix-assisted laser desorption/ionization (MALDI-MS) require frequent multi-point calibration to obtain good mass accuracy over a wide mass range and across large numbers of samples. In this study, we introduce a new synthetic peptide mass calibration standard termed PAS-cal tailored for MALDI-MS based bottom-up proteomics. This standard consists of 30 peptides between 8 and 37 amino acids long and each constructed to contain repetitive sequences of Pro, Ala and Ser as well as one C-terminal Arg residue. MALDI spectra thus cover a mass range between 750 and 3200 m/z in MS mode and between 100 and 3200 m/z in MS/MS mode. Our results show that multi-point calibration of MS spectra using PAS-cal peptides compares well to current commercial reagents for protein identification by peptide mass finger printing. Calibration of tandem mass spectra from LC-MALDI experiments using the longest peptide, PAS-cal37, resulted in smaller fragment ion mass errors, more matching fragment ions and more protein and peptide identifications compared to commercial standards, making the PAS-cal standard generically useful for bottom-up proteomics.

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