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Related Experiment Video

Updated: Apr 7, 2026

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells

Published on: January 5, 2024

Quantifying Protein-mRNA Interactions in Single Live Cells.

Bin Wu¹, Adina R Buxbaum¹, Zachary B Katz²

¹Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

|July 4, 2015

Summary

This summary is machine-generated.

Researchers developed a new method to track RNA-protein interactions in living cells. This study reveals zipcode binding protein 1 (ZBP1) binding to mRNA occurs outside the nucleus, impacting translation regulation.

Keywords:

ZBP1 beta-actin mRNA fluorescence fluctuation spectroscopy ribosomes translational regulation

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Area of Science:

Molecular Biology
Cell Biology
Biophysics

Background:

Specific binding proteins are essential for regulating mRNA spatiotemporal expression.
Understanding RNA-protein interactions within living cells at a subcellular level is crucial for deciphering gene expression control.

Purpose of the Study:

To develop and apply a method for characterizing RNA-protein interactions in single living cells with subcellular resolution.
To quantify the binding of zipcode binding protein 1 (ZBP1) and ribosomes to β-actin mRNA in primary fibroblasts and neurons.

Main Methods:

Combined endogenous single RNA and protein detection.
Utilized two-photon fluorescence fluctuation analysis to measure protein binding to mRNA.
Analyzed binding within subcellular compartments of primary fibroblasts and neurons.

Main Results:

Quantified ZBP1 and ribosome binding to β-actin mRNA in live cells.
Found ZBP1-mRNA binding did not occur in nuclei, contradicting previous findings.
Observed enhanced perinuclear ZBP1-mRNA interaction in neurons versus fibroblasts and anti-correlated cytoplasmic ZBP1 and ribosome binding.

Conclusions:

The study provides a novel method for in vivo RNA-protein interaction analysis.
ZBP1 binding to β-actin mRNA is primarily cytoplasmic, not nuclear.
Findings support a model where ZBP1 inhibits mRNA translation until released peripherally, enabling ribosome binding.