MS Compatible Yeast and Human Protein Extracts
Literature # TM410
The complexity of biological samples places high demand on mass spec analytical capability. Adequate monitoring of instrument performance for proteomics studies requires equally complex reference material such as whole-cell extracts. However, whole-cell extracts available commercially are developed for general research (e.g., enzymatic or Western blot analysis) and contain detergents and salts that interfere with reverse phase liquid chromatography and mass spectrometry. Even after clean up, the extracts need to be digested, requiring time, labor and experience to generate samples for use in mass spectrometry.
To address the need for complex protein material, we have developed whole-cell protein extracts from yeast and human cells. The yeast extract offers the convenience of a relatively small and well annotated proteome, whereas the human extract provides a complex proteome with large dynamic range. The human extract also serves as reference material for studies targeting the human proteome. The extracts are free of compounds that interfere with reverse phase liquid chromatography-mass spectrometry (LC-MS), and have been reduced with DTT and alkylated with iodoacetamide then digested with Trypsin/Lys-C Mix and lyophilized. These digested extracts (tryptic peptides) can be readily reconstituted in trifluoroacetic acid (TFA) or formic acid and injected into an instrument.
The same human and yeast whole-cell extracts also are provided in an intact (undigested) form for users who would like to develop an independent method for preparing protein mass spectrometry samples. For convenience, the intact extracts are provided as a frozen solution.
Printed in the USA 5/14.