Deciphering mechanism of actions of novel compounds by bioactive thermal proteome profiling

ABSTRACT: Exploring the therapeutic effects of bioactive compounds has been traditionally approaching by phenotypic screenings followed by functional validation by in vitro assays. The thermal proteome profiling (TPP) has been successfully applied to study drug targets and off-target. We applied a modified protocol based on TPP to elucidate the mechanism of actions (MOA)s of novel bioactives compounds from marine biodiscovery. We have modified the method to gain the specificity for its application to compounds with limited chemical or structural characterization. Method implementation includes increasing the centrifugation force to precipitate the microsomal fraction previous to the thermal shift assay. The range of temperatures has been reduced to optimize the analysis without compromising resolution. Finally, the mass spectrometry analysis was based on label-free quantitative proteomics. Comparison of the targets among methodologies confirmed that the precipitation of the microsomal membranes before TPP is an essential step to discriminate between true targets from proteins precipitates after subcellular fractionation by centrifugation force. As a probe of concept, a novel marine bioactive compound has been analyzed on the hepatic cell line HepG2. We found that 2 targets proteins, aldehyde dehydrogenase and isocitrate dehydoregenase, can be related with beneficial properties towards obesity and obesity-related comorbidities. Identification of targets is key to decipher the MOAs of bioactive compound, predict the mode of action as well as possible harmful effects.

INSTRUMENT(S): LTQ XL ETD

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Hepatocyte, Cell Culture

SUBMITTER: Ana Maria Carrasco del Amor  

LAB HEAD: Susana Cristobal

PROVIDER: PXD013227 | Pride | 2019-06-28

REPOSITORIES: Pride