1,721,003 research outputs found
Biofilm as an adaptation strategy to extreme conditions
Full text linkBiofilm is the most successful and widely distributed form of life on earth, it is not simply structured collections of cells attached to surfaces but is a dynamic complex biological system able to respond to environmental changes. The biofilm characteristics make it unique and central to microbial evolution and adaptation. The ability to establish biofilms is a key trait for microorganisms growing in extreme environments like extreme temperature, high radiation, acidic or alkaline pH values, heavy metal pollution, and high salinity. In this article, we report the main features of biofilm and how these characteristics make biofilms a successful survival strategy in extreme conditions. All aspects examined in this article help to explain why biofilms are a successful survival strategy in extreme conditions and why the ability to establish biofilms is a key trait for microorganisms growing in extreme environments
The outer membrane glycolipids of bacteria from cold environments: Isolation, characterization, and biological activity
No full textLipopolysaccharides (LPSs) are the main components of the external leaflet of the outer membrane of Gram-negative
bacteria. Microorganisms that colonize permanently or transiently cold habitats have evolved an array of structural
adaptations, some of which involve components of bacterial membranes. These adaptations assure the perfect
functionality of the membrane even at freezing or sub-freezing growth temperatures. This review summarizes the
state-of-the-art information concerning the structural features of the LPSs produced by cold-adapted bacteria. The LPS
structure has recently been elucidated from species mainly belonging to Gammaproteobacteria and Flavobacteriaceae.
Although the reported structural heterogeneity may arise from the phylogenetic diversity of the analyzed source strains,
some generalized trends can be deduced. For instance, it is clear that only a small portion of LPSs displays the O-chain. In
addition, the biological activity of the lipid A portion from several cold-adapted strains is reported
A rolling-circle plasmid from Psycrobacter sp. TA144: evidence for a novel rep subfamily
No full textCell-wall associated polysaccharide from the psychrotolerant bacterium Psychrobacter arcticus 273-4: isolation, purification and structural elucidation
No full textIn this paper, the structure of the capsular polysaccharide isolated from the psychrotolerant bacterium Psychrobacter arcticus
273-4 is reported. The polymer was purified by gel filtration chromatography and the structure was elucidated by means
of one- and two-dimensional NMR spectroscopy, in combination with chemical analyses. The polysaccharide consists of a
trisaccharidic repeating unit containing two residues of glucose and a residue of a N,N-diacetyl-pseudaminic acid
A novel replication element from an Antartic plasmid as a tool for the expression of proteins at low temperature
No full textA novel replication element from an Antartic plasmid as a tool for the expression of proteins at low temperature
No full textMolecular characterisation of a recombinant replication protein (Rep) from the Antartic bacterium Psychrobacter sp. TA144
No full textFactor involved in protein folding from psychrophilic bacterium PhTAC125: a novel dsb locus
No full text- …
