An S/T-Q cluster domain census unveils new putative targets under Tel1/Mec1 control

Hannah C. Cheung, F. Anthony San Lucas, Stephanie Hicks, Kyle Chang, Alison A. Bertuch, Albert Ribes-Zamora

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The cellular response to DNA damage is immediate and highly coordinated in order to maintain genome integrity and proper cell division. During the DNA damage response (DDR), the sensor kinases Tel1 and Mec1 in Saccharomyces cerevisiae and ATM and ATR in human, phosphorylate multiple mediators which activate effector proteins to initiate cell cycle checkpoints and DNA repair. A subset of kinase substrates are recognized by the S/T-Q cluster domain (SCD), which contains motifs of serine (S) or threonine (T) followed by a glutamine (Q). However, the full repertoire of proteins and pathways controlled by Tel1 and Mec1 is unknown.Results: To identify all putative SCD-containing proteins, we analyzed the distribution of S/T-Q motifs within verified Tel1/Mec1 targets and arrived at a unifying SCD definition of at least 3 S/T-Q within a stretch of 50 residues. This new SCD definition was used in a custom bioinformatics pipeline to generate a census of SCD-containing proteins in both yeast and human. In yeast, 436 proteins were identified, a significantly larger number of hits than were expected by chance. These SCD-containing proteins did not distribute equally across GO-ontology terms, but were significantly enriched for those involved in processes related to the DDR. We also found a significant enrichment of proteins involved in telophase and cytokinesis, protein transport and endocytosis suggesting possible novel Tel1/Mec1 targets in these pathways. In the human proteome, a wide range of similar proteins were identified, including homologs of some SCD-containing proteins found in yeast. This list also included high concentrations of proteins in the Mediator, spindle pole body/centrosome and actin cytoskeleton complexes.Conclusions: Using a bioinformatic approach, we have generated a census of SCD-containing proteins that are involved not only in known DDR pathways but several other pathways under Tel1/Mec1 control suggesting new putative targets for these kinases.

Original languageEnglish (US)
Article number664
JournalBMC genomics
Volume13
Issue number1
DOIs
StatePublished - Nov 23 2012
Externally publishedYes

Keywords

  • ATM
  • ATR
  • DNA damage response
  • Phosphorylation
  • Proteome
  • Tel1/Mec1

ASJC Scopus subject areas

  • Biotechnology
  • Genetics

Fingerprint Dive into the research topics of 'An S/T-Q cluster domain census unveils new putative targets under Tel1/Mec1 control'. Together they form a unique fingerprint.

Cite this