Proximity Ligand Assay to Localize Proteins in DNA Damage Sites

Fernanda Luisa Basei; L&#237;via Alves dos Reis Moura; Victor da Cruz Ferreira; Andrey Fabricio Ziem Nascimento; J&#246;rg Kobarg

doi:10.3791/67072

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Biology

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JoVE Journal Biology

Proximity Ligand Assay to Localize Proteins in DNA Damage Sites

DNA損傷部位におけるタンパク質の局在化のための近接リガンドアッセイ

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09:39 min

August 2, 2024

DOI: 10.3791/67072-v

Fernanda Luisa Basei¹, Lívia Alves dos Reis Moura¹, Victor da Cruz Ferreira¹, Andrey Fabricio Ziem Nascimento², Jörg Kobarg¹

¹Faculty of Pharmaceutical Sciences,University of Campinas, ²Brazilian Synchrotron Light Laboratory (LNLS) Brazilian Center for Research in Energy and Materials (CNPEM)

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Overview

This study presents a protocol for detecting protein interactions at DNA damage sites, which is critical for understanding the cellular DNA damage response and identifying potential therapeutic targets.

Key Study Components

Research Area

DNA damage response
Cellular signaling
Protein interactions

Background

The DNA damage response is essential for maintaining genome integrity.
Deficiencies in this process are linked to diseases such as cancer and chronic inflammation.
Identifying protein interactions may provide insights into therapeutic strategies.

Methods Used

Proximity ligation assay (PLA) combined with Gamma-H2AX staining
U2OS cell line used for experimental procedures
Immunofluorescence and confocal microscopy

Main Results

Successful visualization of protein interactions in the context of DNA damage.
Enhanced localization information obtained through the combined assay.
A user-friendly macro for data analysis was developed and validated.

Conclusions

This study demonstrates a novel protocol for examining protein interactions at DNA damage sites.
The findings have significant implications for research in cell biology and therapeutic development.

Frequently Asked Questions

What is the primary goal of the study?

To identify and characterize protein interactions at DNA damage sites.

What cell line was used in the experiments?

The U2OS cell line was used for conducting the experiments.

How does the proximity ligation assay work?

It allows for the detection of protein interactions in close spatial proximity through ligation-mediated amplification.

What is the significance of Gamma-H2AX staining?

Gamma-H2AX serves as a marker for DNA double-strand breaks, indicating areas of DNA damage.

What technologies were characterized in this study?

The study characterizes immunofluorescence microscopy and proximity ligation assays.

Is the protocol suitable for high-throughput analysis?

Yes, the user-friendly macro facilitates analysis and can accommodate high-throughput screening.

What are the potential applications of this research?

The findings could be applied in cancer research and the development of interventions targeting DNA repair mechanisms.

ここでは、DNA損傷部位でのタンパク質相互作用を検出するためのシンプルで迅速なプロトコールを紹介します。

DNA損傷応答は、ゲノムの安定性と完全性を維持する細胞システムです。このプロセスの機能不全は、癌、加齢性疾患、慢性炎症などのいくつかの病気を引き起こします。私たちの目標は、このプロセスに協力するタンパク質を特定し、治療統合のための代替ターゲットの特定を可能にすることです。

DNA損傷応答へのタンパク質の関与を特徴付けるために、通常、DNA損傷のマーカーであるH2AXヒストンのリン酸化型を用いた免疫蛍光研究が適用されます。さらに、DNA損傷後に共免疫沈降などのタンパク質収集アッセイを実施して、シグナル伝達におけるタンパク質の役割を特定することができます。相互作用研究は通常、免疫沈降アッセイに基づいていますが、これらはin vitroであり、相互作用の位置に関する情報は提供されません。

免疫蛍光法は、タンパク質の細胞局在に関する情報を得ることができますが、相互作用の証明は困難であり、顕微鏡の分解能に依存します。ここでは、近接リガンドアッセイとGamma-H2AX染色を組み合わせたシンプルなプロトコルにより、DNA損傷の状況におけるタンパク質の相互作用の空間的および時間的特性評価が可能になることを示します。さらに、データ分析のためのユーザーフレンドリーなマクロを提供しています。

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