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Related Experiment Video

Updated: Jan 30, 2026

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Colicin E3: a unique endoribonuclease.

B Meyhack, I Meyhack, D Apirion

Proceedings of the National Academy of Sciences of the United States of America

|January 1, 1973

Summary

This summary is machine-generated.

Colicin E3 cleaves 16S ribosomal RNA independently of cellular ribonucleases. Experiments using modified ribosomes confirm colicin E3 acts as a unique endoribonuclease, not relying on host enzymes for RNA cleavage.

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Area of Science:

Molecular Biology
Microbiology
Biochemistry

Background:

Colicin E3 is a bacteriocin known to inhibit protein synthesis by cleaving 16S ribosomal RNA (rRNA).
The precise mechanism of colicin E3-mediated rRNA cleavage and whether host cellular ribonucleases are involved remain areas of investigation.

Purpose of the Study:

To investigate the role of cellular ribonucleases in the cleavage of 16S rRNA by colicin E3.
To determine if colicin E3 functions as a unique endoribonuclease or requires host factors for its activity.

Main Methods:

Utilized ribosomes from bacterial strains deficient in specific ribonucleases.
Employed ribosomes with inactivated ribonucleases (heat treatment) and extensively washed ribosomes to remove associated enzymes.
Performed colicin E3 reactions using these modified ribosome preparations.

Main Results:

Colicin E3 effectively cleaved 16S rRNA in all tested ribosome preparations, including those devoid of or treated to inactivate cellular ribonucleases.
Extensively washed ribosomes, lacking significant endogenous ribonuclease activity, were still susceptible to colicin E3-mediated cleavage.
These findings indicate that host cellular ribonucleases are not essential for colicin E3's RNA processing activity.

Conclusions:

Cellular ribonucleases are not involved in the cleavage of 16S rRNA by colicin E3.
Colicin E3 functions as a distinct and unique endoribonuclease, directly mediating rRNA cleavage without relying on host enzymatic machinery.