Abstract
Four major families of bacterial histone-like proteins (HU, IHF, H-NS, FIS), united on the basis of structural similarity and performing specific structural and regulatory functions in the cell, are discussed. Histone-like proteins perform topological modification of the chromosome (twisting, bending, and folding) and directly regulate the functioning of promoters of individual operons. Histone-like proteins are critical for the regulation of cell metabolism, are involved in the response to environmental changes, and play a key role in the transition to and maintenance of the quiescent state of bacteria.
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