Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Shawn R. Yoshida; Shasha Chong

doi:10.3791/66169

JoVE Journal
Biology

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JoVE Journal Biology

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

생체 분자 응축물 내 단백질 상호 작용 역학의 단일 분자 측정

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06:48 min

January 5, 2024

DOI: 10.3791/66169-v

Shawn R. Yoshida^1,2, Shasha Chong¹

¹Division of Chemistry and Chemical Engineering,California Institute of Technology, ²Division of Biology and Biological Engineering,California Institute of Technology

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Overview

This study investigates the dynamics of intrinsically disordered proteins in the formation of biomolecular condensates, which play crucial roles in cellular processes. By employing advanced single-molecule imaging techniques, the research quantifies how proteins interact within condensates in live human cells.

Key Study Components

Research Area

Intrinsically disordered proteins
Biomolecular condensates
Single-molecule imaging

Background

Importance of protein interactions in cellular regulation
Role of disordered proteins in phase separation
Novel methods for studying cellular dynamics

Methods Used

Single-molecule microscopy
Halo-tagged protein expression in human cells
Live-cell imaging techniques

Main Results

Quantification of protein interactions in condensates
Measurement of mean residence times of proteins
Distinction in binding dynamics between different protein constructs

Conclusions

This study elucidates the interaction dynamics of disordered proteins in cellular condensates.
Findings have implications for understanding transcriptional regulation in health and disease.

Frequently Asked Questions

What are biomolecular condensates?

Biomolecular condensates are assemblies of biomolecules that form through liquid-liquid phase separation, influencing various cellular functions.

How does single-molecule imaging work?

Single-molecule imaging allows for the observation of individual molecules in live cells, providing insights into their dynamics and interactions.

What role do intrinsically disordered proteins play?

They are involved in cellular regulation by facilitating interactions within biomolecular condensates.

Why is understanding protein interactions important?

Understanding protein interactions is crucial for elucidating the mechanisms of diseases and developing targeted therapies.

What is the significance of mean residence time?

Mean residence time indicates how long proteins stay bound to condensates, which is important for their functional roles in cells.

Can this method be applied to other proteins?

Yes, the method can be adapted to study the dynamics of various proteins involved in biomolecular condensates.

What are potential applications of this research?

This research may inform drug design and therapeutic strategies targeting disordered protein interactions in diseases.

많은 본질적으로 무질서한 단백질은 수많은 세포 과정에 중요한 행동인 매우 역동적인 생체 분자 응축물의 형성에 관여하는 것으로 나타났습니다. 여기에서, 우리는 살아있는 세포에 있는 생체 분자 응축물에서 단백질이 서로 상호 작용하는 동역학을 정량화하기 위한 단 하나 분자 화상 진찰 근거한 방법을 제시합니다.

1 우리 연구실은본질적으로 무질서한 단백질 영역3의 상호 작용 행동2을 이해하고 건강한 인간 세포와 병든 인간 세포에서 전사 조절4에 어떤 역할을 하는지 이해하는 것을 목표로 합니다. 5 우리 연구실에서는 분자 생물학, 8 생화학 및 단백질체학 접근법 9과 함께 새로운 6 단일 분자 현미경 기술 7을 개발하고 사용하여 생체 분자 응축물을 연구합니다. 10 이 프로토콜은 역학 11의 정량화를 가능하게 하며, 이를 통해 특정 단백질(12)은 살아있는 인간 세포에서 특정 유형의 응축물(13)에 결합하고(14) 액체-액체 상 분리에 참여하는 모든 단백질(16)의 상호 작용 역학을 측정하는 데 광범위하게 적용 가능하다(15).

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