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Updated: Jul 23, 2025

Biomimetic Materials to Characterize Bacteria-host Interactions

Biomimetic Materials to Characterize Bacteria-host Interactions

Published on: November 16, 2015

BamE directly interacts with BamA and BamD coordinating their functions.

Santosh Kumar¹, Anna Konovalova¹

¹Department of Microbiology and Molecular Genetics, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, Texas, USA.

Molecular Microbiology

|July 17, 2023

Summary

The bacterial outer membrane protein assembly machinery (Bam) complex includes BamE, which directly interacts with BamA and BamD. This interaction stabilizes the complex and is crucial for bacterial outer membrane protein assembly.

Keywords:

bacterial cell envelope membrane proteins outer membrane biogenesis

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Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

The β-barrel assembly machinery (Bam) complex is essential for outer membrane protein (OMP) assembly in gram-negative bacteria.
The Bam complex comprises five subunits (BamA-E), with BamA being the transmembrane component and BamD being the only essential regulatory subunit.

Purpose of the Study:

To investigate the specific molecular functions of BamE within the Bam complex.
To elucidate the role of BamE in the assembly of outer membrane proteins, particularly in the context of the Regulator of Capsule Synthesis (Rcs) stress response.

Main Methods:

Utilized RcsF/OmpA as a model substrate for studying BamE function.
Employed genetic and biochemical analyses to assess protein interactions and complex stability.

Main Results:

Demonstrated that BamE directly interacts with BamA, challenging the previous view of BamE solely as a BamD regulator.
Showed that BamE's interaction with both BamA and BamD is critical for its function.
Found that BamE stabilizes the Bam complex and facilitates bidirectional signaling between BamA and BamD.

Conclusions:

BamE plays a direct and essential role in modulating the Bam complex's activity, beyond its previously proposed regulatory function.
BamE's ability to bridge BamA and BamD is vital for efficient OMP assembly, especially when direct BamA-BamD communication is impaired.