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Profiling of Methyltransferases and Other S-adenosyl-L-homocysteine-binding Proteins by Capture Compound Mass Spectrometry CCMS

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CtIP/Ctp1/Sae2, molecular form fit for function.

Sara N Andres¹, R Scott Williams¹

¹Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, US National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, United States.

|June 18, 2017

Summary

This summary is machine-generated.

CtIP proteins regulate DNA double-strand break repair by interacting with the MRN complex. These intrinsically unstructured proteins coordinate DNA strands and influence repair pathway choice through binding and modification.

Keywords:

CtIP/Ctp1/Sae2 DNA bridging Homologous recombination Intrinsically disordered proteins Resection

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Published on: May 13, 2020

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

CtIP and its orthologs (Ctp1, Sae2, Com1) are crucial regulators of DNA double-strand break (DSB) responses.
These proteins modulate the Mre11/Rad50/Nbs1 (MRN) complex's nucleolytic activity, guiding DSBs towards homologous recombination (HR) repair.
Recent research is elucidating the molecular mechanisms underlying CtIP's regulatory functions in DSB repair.

Purpose of the Study:

To define the molecular underpinnings of CtIP's regulatory activities in DNA double-strand break repair.
To explore the structural and functional roles of CtIP homologs in processing and signaling DSBs.
To understand how CtIP influences the choice of DNA repair pathways, particularly homologous recombination.

Main Methods:

Structural biology studies (e.g., X-ray crystallography, NMR) to determine the architecture of CtIP homologs.
Biophysical techniques (e.g., SPR, ITC) to analyze DNA binding and protein-protein interactions.
Biological assays to assess the in vivo functions of CtIP in DNA repair and cell cycle regulation.

Main Results:

CtIP homologs are intrinsically unstructured proteins with a conserved N-terminal tetrameric helical dimer of dimers (THDD) region and a C-terminal Sae2-homology domain.
The THDD region mediates CtIP oligomerization, while the C-terminal domain binds DNA and interacts with the MRN complex.
CtIP functions in dynamic DNA strand coordination, MRN nuclease cofactor activity, and as a hub for cell cycle regulatory factors.

Conclusions:

CtIP plays multifaceted roles in DSB repair, including direct DNA interaction, modulation of MRN nuclease activity, and integration of cell cycle signals.
Its unique structure, characterized by intrinsically disordered regions and specific conserved domains, underlies its diverse functions.
Understanding CtIP's mechanisms provides insights into maintaining genome stability and DSB repair pathway fidelity.