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Related Experiment Video

Updated: Jun 5, 2026

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

Nuclear shield: a multi-enzyme task-force for nucleus protection.

Raffaele Fabrini¹, Alessio Bocedi, Valentina Pallottini

¹Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy.

|December 21, 2010

Summary

Eukaryotic cells possess a novel "nuclear shield" composed of cationic enzymes and proteins that protects DNA from damage. This protective layer, found in all rat tissues, enhances cellular defense mechanisms against oxidative stress.

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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

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Published on: July 29, 2018

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Eukaryotic cells protect DNA within the nucleus using the nuclear envelope and protective molecules.
Accumulation of detoxifying enzymes like glutathione transferase near the nucleus suggests additional protective mechanisms.
The study investigates a previously unrecognized enzyme machinery safeguarding the nuclear membrane.

Purpose of the Study:

To identify and characterize a novel enzyme machinery protecting the nuclear envelope.
To understand the composition and function of this
nuclear shield".
To determine the role of this shield in protecting DNA from damage.

Main Methods:

Electron spectroscopic imaging and zeta potential measurements were used to analyze the structure.
Isoelectric focusing, comet assay, and mass spectrometry characterized the shield's components and function.
Enzyme activity and chromosomal sensitivity to oxidative stress were assessed before and after shield removal.

Main Results:

A ~300 nm thick
nuclear shield" of hyper-crowded cationic enzymes and proteins was identified around the nuclear membrane in all rat tissues examined.
Key protective enzymes (glutathione transferase, catalase, glutathione peroxidase) showed up to seven-fold higher concentrations within the shield compared to the cytosol, with retained catalytic activity.
Removal of the shield increased chromosome sensitivity to oxidative stress, indicating its protective role.

Conclusions:

The discovery of this nuclear shield reveals a new safeguard mechanism in eukaryotic cells, distinct from adaptive responses based on enzyme expression.
This localized accumulation of protection enzymes near the nucleus represents a novel modality for cellular defense.
The findings open new avenues for understanding physiological and protection processes in eukaryotes.