Biocrystalline Structures in the Nucleoids of the Stationary and Dormant Prokaryotic Cellsстатья
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Дата последнего поиска статьи во внешних источниках: 4 января 2018 г.
Аннотация:Compaction and biocrystallization of the nucleoid are presently considered as a necessary and
important stage in the transformation of the cell ultrastructure during change of microbial cultures strategies
from growth to survival. Nucleoid biocrystallization in the stationary phase cells is achieved due to structural
regularity of the DNA complexes with the histone-like Dps protein. Our experiments with Escherichia coli
mutants, overproducers of the Dps protein, confirmed nucleoid biocrystallization in the late stationary phase
cells. Since nucleoid biocrystallization was revealed in E. сoli cells without Dps overproduction at late stages
of starvation, it is constitutive in the cycle of development of microbial populations. The present work concentrated
on detection of the nucleoid biocrystalline structure in (1) long-starved (21 day in the chemostat
mode) bacterial cells (genera Arthrobacter and Pseudomonas), (2) dormant ametabolic (anabiotic) cells of
such prokaryotes as archaea and non-spore-forming bacteria, (3) endospores of bacilli, (4) streptomycete
exospores, and (5) in the cells surviving in permafrost for (2‒3 Ma). The topics discussed include nucleoid
biocrystallization as a necessary stage of maturation of the dormant microbial cells providing for survival and
preservation of the species, dynamics of nucleoid biocrystallization during maturation of the dormant cells,
and its possible role for the preservation of genetic information in the case of autolysis of most of the cells in
a developing culture