Atomic Force Microscopy Imaging and Analysis of Prokaryotic Genome Organization

Area of Science:

• Microscopy and Structural Biology
• Molecular and Cellular Biology
• Genomics and Proteomics

Background:

• Understanding the structural organization of nucleoids is crucial for comprehending cellular processes in prokaryotes and organelles.
• Existing methods may not provide sufficient resolution or functional insights into nucleoid architecture.
• Atomic Force Microscopy (AFM) offers high-resolution imaging capabilities for biological samples.

Purpose of the Study:

• To present a detailed protocol for applying AFM to study nucleoid structure.
• To enable stepwise dissection and analysis of nucleoid organization from fundamental units to higher-order structures.
• To demonstrate the combined use of AFM with molecular-genetic and biochemical techniques for functional analysis of nucleoid factors.

Main Methods:

• Development of a cell manipulation protocol involving on-substrate lysis and enzyme treatment.
• Application of Atomic Force Microscopy (AFM) for high-resolution imaging of dissected nucleoids.
• Integration of molecular-genetic and biochemical assays for functional characterization of nucleoid-associated proteins.

Main Results:

• Successful application of AFM for detailed structural analysis of prokaryotic and organellar nucleoids.
• Demonstration of stepwise nucleoid dissection, revealing organizational levels from DNA to higher-order structures.
• Case studies illustrating the functional roles of specific nucleoid factors (Dps in E. coli, TrmBL2 in T. kodakarensis) in structural reorganization.

Conclusions:

• The described AFM protocol is effective for elucidating nucleoid structural organization and dynamics.
• This methodology facilitates the investigation of how key factors influence nucleoid architecture and function.
• The protocol provides a framework for quantitative analysis of AFM data related to nucleoid structure.