Regulation of flagellar assembly.

Area of Science:

• Microbiology
• Molecular Biology
• Biochemistry

Background:

• Bacterial flagellar assembly is a complex, multi-step process.
• Historically, research focused on transcriptional regulation of flagellar genes.
• Recent studies highlight the importance of translational and post-translational control.

Purpose of the Study:

• To elucidate the molecular mechanisms governing bacterial flagellar assembly.
• To investigate the roles of translational and post-translational regulation in this process.
• To utilize the flagellum as a model for understanding complex molecular assembly and type III secretion systems.

Main Methods:

• Analysis of gene transcription patterns during flagellar assembly.
• Investigation of translational control mechanisms affecting key flagellar proteins.
• Study of post-translational modifications influencing flagellar structure and function.
• Comparative studies in model organisms like Salmonella and Caulobacter crescentus.

Main Results:

• Confirmed coupling between flagellar gene transcription and assembly.
• Identified translational regulation of anti-sigma(28) factor FlgM in Salmonella.
• Demonstrated translational control of flagellin fljK in Caulobacter crescentus.
• Revealed post-translational control over hook length and substrate discrimination in type III secretion.

Conclusions:

• Bacterial flagellar assembly relies on intricate regulatory networks involving transcription, translation, and post-translational modifications.
• These regulatory layers ensure the precise and efficient construction of the flagellum.
• The flagellum serves as a valuable model for understanding fundamental biological processes, including type III secretion.