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2018 ; 9
(4
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Role of the Extremolytes Ectoine and Hydroxyectoine as Stress Protectants and
Nutrients: Genetics, Phylogenomics, Biochemistry, and Structural Analysis
#MMPMID29565833
Czech L
; Hermann L
; Stöveken N
; Richter AA
; Höppner A
; Smits SHJ
; Heider J
; Bremer E
Genes (Basel)
2018[Mar]; 9
(4
): ä PMID29565833
show ga
Fluctuations in environmental osmolarity are ubiquitous stress factors in many
natural habitats of microorganisms, as they inevitably trigger osmotically
instigated fluxes of water across the semi-permeable cytoplasmic membrane. Under
hyperosmotic conditions, many microorganisms fend off the detrimental effects of
water efflux and the ensuing dehydration of the cytoplasm and drop in turgor
through the accumulation of a restricted class of organic osmolytes, the
compatible solutes. Ectoine and its derivative 5-hydroxyectoine are prominent
members of these compounds and are synthesized widely by members of the Bacteria
and a few Archaea and Eukarya in response to high salinity/osmolarity and/or
growth temperature extremes. Ectoines have excellent function-preserving
properties, attributes that have led to their description as chemical chaperones
and fostered the development of an industrial-scale biotechnological production
process for their exploitation in biotechnology, skin care, and medicine. We
review, here, the current knowledge on the biochemistry of the
ectoine/hydroxyectoine biosynthetic enzymes and the available crystal structures
of some of them, explore the genetics of the underlying biosynthetic genes and
their transcriptional regulation, and present an extensive phylogenomic analysis
of the ectoine/hydroxyectoine biosynthetic genes. In addition, we address the
biochemistry, phylogenomics, and genetic regulation for the alternative use of
ectoines as nutrients.