Proteomics

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Single-copy locus proteomics of early- and late-firing DNA replication origins identifies a role of Ask1/DASH complex in replication timing control


ABSTRACT: The chromatin at origins of replication is thought to influence DNA replication initiation in eukaryotic genomes. However, it remains unclear how the chromatin composition controls the firing of early-efficient (EE) or late-inefficient (LI) origins. Here, we used site-specific recombination and single-locus chromatin isolation to purify EE and LI replication origins in Saccharomyces cerevisiae . Using mass spectrometry, we define the histone modification landscape and identify the protein composition of native chromatin regions surrounding the EE and LI replication start sites. In addition to the known origin interactors, we find novel origin-associated factors, such as the kinetochore-associated Ask1/DASH complex. Strikingly, we show that Ask1 regulates the replication timing control of specific origins in yeast. Thus, our unbiased approach identifies functionally-relevant proteomes at single-copy loci and would be widely applicable to provide an in-depth quantitative characterization of histone modification and protein interaction networks of chromatin at any genomic locus of interest.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)

TISSUE(S): Cell Suspension Culture

SUBMITTER: Ann-Christine König  

LAB HEAD: Dr Stephan Hamperl

PROVIDER: PXD032930 | Pride | 2023-02-16

REPOSITORIES: Pride

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Publications

Single-copy locus proteomics of early- and late-firing DNA replication origins identifies a role of Ask1/DASH complex in replication timing control.

Weiβ Matthias M   Chanou Anna A   Schauer Tamas T   Tvardovskiy Andrey A   Meiser Stefan S   König Ann-Christine AC   Schmidt Tobias T   Kruse Elisabeth E   Ummethum Henning H   Trauner Manuel M   Werner Marcel M   Lalonde Maxime M   Hauck Stefanie M SM   Scialdone Antonio A   Hamperl Stephan S  

Cell reports 20230125 2


The chromatin environment at origins of replication is thought to influence DNA replication initiation in eukaryotic genomes. However, it remains unclear how and which chromatin features control the firing of early-efficient (EE) or late-inefficient (LI) origins. Here, we use site-specific recombination and single-locus chromatin isolation to purify EE and LI replication origins in Saccharomyces cerevisiae. Using mass spectrometry, we define the protein composition of native chromatin regions su  ...[more]

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