RapiGest Precipitation Depends on Peptide Concentration

ABSTRACT: The mass spectrometry-compatible surfactant RapiGest promotes the enzymatic digestion of proteins by facilitating their unfolding while retaining enzymatic activity. RapiGest consists of a hydrophilic head and a hydrophobic tail, which can be separated by acid hydrolysis. This allows for removal of RapiGest prior to mass spectrometric analysis via precipitation and solid phase extraction. During in-solution digestion experiments with RapiGest, we noticed a high variability in the formation of precipitates after acid hydrolysis, implying that RapiGest precipitation is sample-dependent. We show that RapiGest hydrolyzes efficiently under acidic conditions and that differences in precipitation are solely due to protein/peptide concentration. Furthermore, we demonstrate that RapiGest precipitation can be triggered by the addition of intact proteins, providing a strategy for its efficient removal from highly diluted samples.

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human) Bos Taurus (bovine) Gallus Gallus (chicken)

TISSUE(S): Epithelial Cell Of Cervix

SUBMITTER: Robert Hardt  

LAB HEAD: Dominic Winter

PROVIDER: PXD025982 | Pride | 2021-09-07

REPOSITORIES: Pride