Mutations in the Global Transcription Factor CRP/CAP: Insights from Experimental Evolution and Deep Sequencing

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• The cyclic AMP receptor protein (CRP), also known as catabolite activator protein (CAP), is a crucial transcription factor in *Escherichia coli*.
• CRP regulates bacterial gene expression in response to glucose levels and is extensively studied.
• Decades of research have utilized CRP mutants to understand its structure and function.

Purpose of the Study:

• To provide an overview of previously isolated CRP mutants.
• To present new findings from deep sequencing of bacterial populations under selective pressure for *crp* mutations.
• To identify novel CRP mutations for a deeper understanding of its regulatory role.

Main Methods:

• Review of existing literature on CRP mutant isolation.
• Deep sequencing of *crp* locus in evolved bacterial populations.
• Analysis of newly identified CRP mutations.

Main Results:

• Identification of over 100 new CRP mutations.
• Characterization of mutations arising under specific selective pressures.
• Expansion of the known mutational landscape of CRP.

Conclusions:

• The study expands the repertoire of known CRP mutations.
• New insights into CRP's regulatory mechanisms are gained through novel mutations.
• This work provides a foundation for further investigation into CRP's role as a master bacterial regulator.