Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Shawn R. Yoshida; Shasha Chong

doi:10.3791/66169

Einzelmolekülmessung der Proteininteraktionsdynamik in biomolekularen Kondensaten

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Biology

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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Einzelmolekülmessung der Proteininteraktionsdynamik in biomolekularen Kondensaten

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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.

Es wurde gezeigt, dass viele intrinsisch ungeordnete Proteine an der Bildung hochdynamischer biomolekularer Kondensate beteiligt sind, ein Verhalten, das für zahlreiche zelluläre Prozesse wichtig ist. Hier stellen wir eine auf Einzelmolekül-Bildgebung basierende Methode zur Quantifizierung der Dynamik vor, mit der Proteine in biomolekularen Kondensaten in lebenden Zellen miteinander interagieren.

1 Unser Labor zielt darauf ab, das Interaktionsverhalten2 von intrinsisch ungeordneten Proteinregionen 3 zu verstehen und zu verstehen, wie sie eine Rolle bei der transkriptionellen Regulation 4 in gesunden und kranken menschlichen Zellen spielen. 5 In unserem Labor entwickeln und verwenden wir neuartige 6 Einzelmolekül-Mikroskopietechniken 7 in Kombination mit Molekularbiologie, 8 biochemischen und proteomischen Ansätzen 9, um biomolekulare Kondensate zu untersuchen. 10 Dieses Protokoll ermöglicht die Quantifizierung der Dynamik 11, durch die ein spezifisches Protein 12 bindet an eine bestimmte Art von Kondensat 13 in lebenden menschlichen Zellen 14 und ist breit anwendbar 15 zur Messung der Interaktionsdynamik eines Proteins 16, das an der Flüssig-Flüssig-Phasentrennung beteiligt ist.

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Biologie Ausgabe 203 Intrinsisch ungeordnete Proteine Proteinbindungsdynamik biomolekulare Kondensate Flüssig-Flüssig-Phasentrennung Einzelpartikelverfolgung Fluoreszenzmikroskopie