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Prokaryotic cytoskeletons: in situ and ex situ structures and cellular locations

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Abstract

Cytoskeletons have long been perceived to be present only in eukaryotes. However, this notion changed drastically in the 1990s, with observations of cytoskeleton-like structures in several prokaryotes. Homologs of the main components of eukaryotic cytoskeletons, such as microtubules, microfilaments, and intermediate filaments, have been identified in bacteria and archaea. Tubulin homologs include filamenting temperature-sensitive mutant Z (FtsZ), bacterial tubulin A/B (BtubA/B), and tubulin/FtsZ-like protein (TubZ), whereas actin homologs comprise murein region B (MreB) and crenactin. Unlike other proteins, crescentin (CreS) is a homolog of intermediate filaments. Recent findings elucidated their localization, structural organization, and helical properties in prokaryotes, thus revising traditional models. FtsZ is involved in cell division, forming a bundle of overlapping filaments that cover the entire division plane. Cryogenic transmission electron microscopy identified tubular structures of BtubA/B that were not previously identified using conventional ultrathin plastic sections. TubZ generates two joint filaments to form a quadruplex structure. After a long debate, MreB, a cell shape determinant, was shown to form filament stretches that move circumferentially around rod-shaped bacteria. Initially characterized as single-stranded, crenactin was eventually identified as right-handed double-stranded helical filaments. CreS, another cell shape determinant, forms filament bundles located inside the inner membrane of the concave side of cells. These observations suggest that the use of in situ or ex situ microscopy in combination with structural analysis techniques will enable the elucidation and further understanding of the current models of prokaryotic cytoskeletons.

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  1. School of Ecology and Environmental System, Kyungpook National University, Sangju, 37224, Korea

    Ki Woo Kim

  2. Tree Diagnostic Center, Kyungpook National University, Sangju, 37224, Korea

    Ki Woo Kim

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Kim, K.W. Prokaryotic cytoskeletons: in situ and ex situ structures and cellular locations. Antonie van Leeuwenhoek 112, 145–157 (2019). https://doi.org/10.1007/s10482-018-1142-5

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