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Microdiversification of a Pelagic Polynucleobacter Species Is Mainly Driven by Acquisition of Genomic Islands from a Partially Interspecific Gene Pool
TLDR
Microdiversification of a planktonic freshwater bacterium was studied by comparing 37 Polynucleobacter asymbioticus strains obtained from three geographically separated sites in the Austrian Alps, finding the extent of functional diversification found on this narrow phylogenetic scale is compelling.
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Polynucleobacter wuianus sp. nov., a free-living freshwater bacterium affiliated with the cryptic species complex PnecC.
TLDR
Pairwise average nucleotide identity comparisons of whole-genome sequences suggested that strain QLW-P1FAT50C-4T represents a novel species, for which the name Polynucleobacter wuianus sp.
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Combined Methylome, Transcriptome and Proteome Analyses Document Rapid Acclimatization of a Bacterium to Environmental Changes
TLDR
An adaptive process due to evolutionary pressure in the genus was deduced by calculating the ratios of non-synonymous to synonymous substitution rates for 20 Polynucleobacter spp.
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Genomic divergence and cohesion in a species of pelagic freshwater bacteria
TLDR
The high extent of homologous recombination among P. asymbioticus bacteria can act as a cohesive force that effectively counteracts genetic divergence in geographically separated ecosystems and therefore plays an important role in the evolution and consistency of bacterial freshwater species.
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Ecological Differentiation in Two Major Freshwater Bacterial Taxa Along Environmental Gradients
TLDR
It is shown that physico-chemical factors had the greatest impact on both genera, and an exceptionally broad ecological spectrum of operational taxonomic units (OTUs) was found, suggesting that geographic diversity patterns are attributable to region-specific physICO-chemical characteristics rather than latitudinal gradients or lake sizes.
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Lipocalin Q83 reveals a dual ligand binding mode with potential implications for the functions of siderocalins.
TLDR
This work shows that siderocalin Q83 displays an unexpected dual ligand binding mode as it can bind enterobactin and unsaturated fatty acids simultaneously, and suggests that Q83 is a metabolic hub linking iron and fatty acid pathways.
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Siderocalin Q83 exhibits differential slow dynamics upon ligand binding
TLDR
Observations of Siderocalin Q83 strongly suggest an allosteric regulation where binding of one ligand enhances the affinity of Q83 for the other one and strengthen the emerging view of proteins as dynamic ensembles interconverting between different sub-states with distinct functionalities.
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Polynucleobacter paneuropaeus sp. nov., characterized by six strains isolated from freshwater lakes located along a 3000 km north-south cross-section across Europe.
TLDR
Comparative genome analyses reveal that the six strains form a genomically coherent group characterized by whole-genome average nucleotide identity (gANI) values of >98% but separated by gANI values of <88% from the type strains and representatives of the 16 previously described Polynucleobacter species, a monophyletic cluster that is clearly separated from all other described species.
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Continental-Scale Gene Flow Prevents Allopatric Divergence of Pelagic Freshwater Bacteria
TLDR
It is concluded that allopatric divergence in European P. paneuropaeus is minor, and that effective gene flow across the sampled geographic range in combination with a high recombination efficacy maintains species coherence.
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Opening a next‐generation black box: Ecological trends for hundreds of species‐like taxa uncovered within a single bacterial >99% 16S rRNA operational taxonomic unit
TLDR
The presented new cultivation-independent approach opened a window to an incredible, previously unseen diversity, and enables investigations aiming on deeper understanding of how environmental conditions shape bacterial communities and drive evolution of free-living bacteria.
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