Dataset Information

Crosslinking/mass spectrometry analysis of Fanconi anemia (FA) pathway FANCD2-FANCI complexes

ABSTRACT: DNA interstrand crosslinks (ICLs) are repaired by the Fanconi anemia (FA) pathway. The FA pathway is activated by phosphorylation of FANCI in FANCD2-FANCI complex. To investigate how phosphorylation regulates FA pathway activation and function, recombinant FANCD2-FANCI complexes prepared using either the wild-type FANCI or the phosphomimetic FANCI, were comparied using crosslinking/mass spectrometry.

ORGANISM(S): Cellular Organisms

SUBMITTER: Juri Rappsilber

PROVIDER: PXD031632 | JPOST Repository | Fri Nov 18 00:00:00 GMT 2022

REPOSITORIES: jPOST

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Publications

The DNA-damage kinase ATR activates the FANCD2-FANCI clamp by priming it for ubiquitination.

Sijacki Tamara T Alcón Pablo P Chen Zhuo A ZA McLaughlin Stephen H SH Shakeel Shabih S Rappsilber Juri J Passmore Lori A LA

Nature structural & molecular biology 20220901 9

DNA interstrand cross-links are tumor-inducing lesions that block DNA replication and transcription. When cross-links are detected at stalled replication forks, ATR kinase phosphorylates FANCI, which stimulates monoubiquitination of the FANCD2-FANCI clamp by the Fanconi anemia core complex. Monoubiquitinated FANCD2-FANCI is locked onto DNA and recruits nucleases that mediate DNA repair. However, it remains unclear how phosphorylation activates this pathway. Here, we report structures of FANCD2-F ...[more]

PMID: 36050501

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Project description:Each protein within a regulatory complex associates with the genome by either binding DNA directly or by forming protein-protein interactions with DNA-bound proteins. In the chromatin immunoprecipitation (ChIP) assay, each protein’s unique mode of genomic association may be reflected by their patterns of formaldehyde-induced crosslinks to the DNA sequences that are in very close proximity. The ChIP-exo protocol precisely delineates protein-DNA crosslinking patterns by combining ChIP with 5' to 3' exonuclease digestion. Within a regulatory complex, the physical distance of a regulatory protein to the DNA affects crosslinking efficiencies. Therefore, the spatial organization of a protein-DNA complex could potentially be inferred by analyzing how crosslinking signatures vary between the subunits of a regulatory complex, and how they remain consistent over a set of coordinately regulated regions. Here, we present a computational framework that aligns ChIP-exo crosslinking patterns from multiple proteins across a set of regulatory regions, and which detects and quantifies protein-DNA crosslinking events within the aligned profiles. Our gapped multiple profile alignment approach does not rely on sequence motif features, but rather operates directly on the multi-protein, strand separated ChIP-exo tag patterns. The output of the alignment approach is a set of composite profiles that represent the crosslinking signatures of the complex across analyzed regulatory regions. We then use a probabilistic mixture model to deconvolve individual crosslinking events within the aligned ChIP-exo profiles, enabling consistent measurements of protein-DNA crosslinking strengths across multiple proteins. Lastly, we apply dimensionality reduction to visualize the relative organization of proteins within the regulatory complex. We demonstrate our approach by applying it to characterize regulatory complex organization in three biological settings. Firstly, we demonstrate that our alignment approach can recover the known organization of regulatory proteins at yeast ribosomal protein genes, without relying on any DNA sequence features. Secondly, we apply our gapped alignment and crosslinking quantification approaches to a novel set of ChIP-exo data to characterize the spatial organization of Pol III transcriptional machinery assembly at yeast tRNA genes. Finally, we demonstrate that our approach can be used to quantify changes in protein-DNA complex organization when applied to ChIP-nexus data from Drosophila Pol II transcriptional components in two experimental conditions. Our results suggest that principled analyses of ChIP-exo crosslinking patterns enable inference of spatial organization within protein-DNA complexes.

Dataset Information

Crosslinking/mass spectrometry analysis of Fanconi anemia (FA) pathway FANCD2-FANCI complexes

Publications

The DNA-damage kinase ATR activates the FANCD2-FANCI clamp by priming it for ubiquitination.

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