Proteomics

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Maximizing Confidence and Sensitivity in quantitative Phosphoproteomics - Targets of Mec1 kinase


ABSTRACT: Proteome-wide analysis of phosphorylation events is a challenging, yet essential, task for the comprehensive and unbiased investigation of kinase action. Here we developed a phosphoproteomic approach in which quantitation consistency among reversed isotopically labeled samples is used as a central filtering rule for achieving reliability with minimal loss of data content. Exclusion of non-reverting data-points from the dataset not only reduces quantitation error and variation, but also reduces false positive identifications. Application of our approach identified new substrates of the Mec1 kinase.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Saccharomyces Cerevisiae (ncbitaxon:4932)

SUBMITTER: Marcus Smolka  

PROVIDER: MSV000084875 | MassIVE | Thu Jan 30 18:19:00 GMT 2020

SECONDARY ACCESSION(S): PXD017339

REPOSITORIES: MassIVE

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Publications

Maximized quantitative phosphoproteomics allows high confidence dissection of the DNA damage signaling network.

Faca Vitor Marcel VM   Sanford Ethan J EJ   Tieu Jennifer J   Comstock William W   Gupta Shagun S   Marshall Shannon S   Yu Haiyuan H   Smolka Marcus B MB  

Scientific reports 20201022 1


The maintenance of genomic stability relies on DNA damage sensor kinases that detect DNA lesions and phosphorylate an extensive network of substrates. The Mec1/ATR kinase is one of the primary sensor kinases responsible for orchestrating DNA damage responses. Despite the importance of Mec1/ATR, the current network of its identified substrates remains incomplete due, in part, to limitations in mass spectrometry-based quantitative phosphoproteomics. Phosphoproteomics suffers from lack of redundanc  ...[more]

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