Abstract
Superresolution imaging technology has contributed to our understanding of the subnucleoid organization in E. coli cells. Multicolor superresolution images revealing "bacterial nucleolus-like structure or organization," "nucleolus-like compartmentalization of the transcription factories," and "spatial segregation of the transcription and replication machineries" have enhanced our understanding of the dynamic landscape of the bacterial chromatin. This chapter provides a brief introduction into multicolor three-dimensional superresolution structured illumination microscopy (3D-SIM) used to study the spatial organization of the transcription machinery and its spatial relationship with replisomes from a microbiological research perspective. In addition to a detailed protocol, practical considerations are discussed in relation to (1) sampling and treatment of cells containing fluorescent fusion proteins, (2) imaging the transcription and replication machineries at single-cell levels, (3) performing imaging experiments to capture the spatial organization of the transcription machinery and the nucleoid, and (4) image acquisition and analysis.
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