# In E. coli , the expression of mechanosensitive channels depends on environmental conditions

## TL;DR

This study shows that in E. coli, the expression of mechanosensitive channels varies with environmental conditions, and the most expressed genes match the most observed channels in experiments.

## Contribution

The study provides the first comprehensive qPCR-based analysis of mechanosensitive channel gene expression in E. coli under various conditions.

## Key findings

- MscS, MscM, and MscL are the most highly expressed mechanosensitive channel genes in E. coli.
- Gene expression levels correlate with the frequency of channel observation in electrophysiology experiments.
- Environmental conditions significantly influence the relative expression of mechanosensitive channel genes.

## Abstract

Bacterial mechanosensitive ion channels are essential for cell survival in response to osmotic downshock, these channels rescue bacteria from lethal pressure changes. In
Escherichia coli
(
E. coli
), the genome encodes for a single copy of MscL and six MscS superfamily members (MscS, MscK, MscM, YnaI, YbdG, and YbiO). The majority of these have been shown to gate in response to tension. Here, we determined the relative expression using qPCR of all seven genes in non-modified
E. coli
cultured in a variety of different conditions. In all conditions, the highest expressed genes directly correlate with the most frequently observed channels in patch clamp electrophysiology: MscS, MscM, and MscL.