Abstract

Sample-matrix preparation procedures are shown to greatly influence the quality of the matrix-assisted laser desorption/ionization (MALDI) mass spectra of peptides and proteins. In particular, dramatic mass discrimination effects are observed when using the matrix 4-hydroxy-a-cyanocinnamic acids for analyzing complex mixtures of peptides and proteins. The discrimination effects are found to be strongly dependent on the sample-matrix solution composition, pH, and the rates at which the sample-matrix co-crystals are grown. These findings demonstrate the need to exercise great care in performing and interpreting MALDI analysis of biological samples. The results also indicate that there is a chromatographic-like behavior in the sample-matrix preparation procedures that can be exploited to optimize the analysis. The present work describes the conditions under which the majority of components of a complex mixture of peptides and proteins can be successfully measured. A paper describing these results is in press in Anal. Chem.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR000862-23
Application #
5221592
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
23
Fiscal Year
1996
Total Cost
Indirect Cost

  Publications

Manning, Lois R; Popowicz, Anthony M; Padovan, Julio C et al. (2017) Gel filtration of dilute human embryonic hemoglobins reveals basis for their increased oxygen binding. Anal Biochem 519:38-41
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Krutchinsky, Andrew N; Padovan, Júlio C; Cohen, Herbert et al. (2015) Optimizing electrospray interfaces using slowly diverging conical duct (ConDuct) electrodes. J Am Soc Mass Spectrom 26:659-67
Oricchio, Elisa; Papapetrou, Eirini P; Lafaille, Fabien et al. (2014) A cell engineering strategy to enhance the safety of stem cell therapies. Cell Rep 8:1677-1685
Zhong, Yu; Morris, Deanna H; Jin, Lin et al. (2014) Nrbf2 protein suppresses autophagy by modulating Atg14L protein-containing Beclin 1-Vps34 complex architecture and reducing intracellular phosphatidylinositol-3 phosphate levels. J Biol Chem 289:26021-37
Xue, John Z; Woo, Eileen M; Postow, Lisa et al. (2013) Chromatin-bound Xenopus Dppa2 shapes the nucleus by locally inhibiting microtubule assembly. Dev Cell 27:47-59
Indiani, Chiara; O'Donnell, Mike (2013) A proposal: Source of single strand DNA that elicits the SOS response. Front Biosci (Landmark Ed) 18:312-23

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