Identification of novel broad host-range promoter sequences functional in diverse Pseudomonadota by a promoter-trap approach.

Finding novel promoter sequences is a cornerstone of synthetic biology. To contribute to the expanding catalog of biological parts, we employed a promoter-trap approach to identify novel sequences within an Antarctic microbial community that act as broad host-range promoters functional in diverse Pseudomonadota. Using Pseudomonas putida KT2440 as host, we generated a library comprising approximately 2,000 clones resulting in the identification of thirteen functional promoter sequences, thereby expanding the genetic toolkit available for this chassis.

Sphaerotilus uruguayifluvii sp. nov., a novel filamentous bacterium isolated from river water.

Strain C29, a Gram-staining-negative, straight rod occurring singly, in pairs or short chains, was isolated from floating filamentous biomass of the Uruguay River. The strain was catalase and oxidase positive, chemoorganotrophic, strictly aerobic, non-motile, and grew at pH 6.0-9.

Datathons: fostering equitability in data reuse in ecology.

Approaches to rapidly collecting global biodiversity data are increasingly important, but biodiversity blind spots persist. We organized a three-day Datathon event to improve the openness of local biodiversity data and facilitate data reuse by local researchers. The first Datathon, organized among microbial ecologists in Uruguay and Argentina assembled the largest microbiome dataset in the region to date and formed collaborative consortia for microbiome data synthesis.

Pseudomonas violetae sp. nov. and Pseudomonas emilianonis sp. nov., two new species with the ability to degrade TNT isolated from soil samples at Deception Island, maritime Antarctica.

Two motile, rod-shaped, Gram-stain-negative bacterial strains, TNT11 and TNT19, were isolated from soil samples collected at Deception Island, Antarctica. According to the 16S rRNA gene sequence similarity, both strains belong to the genus Pseudomonas. Further genomic analyses based on ANI and dDDH suggested that these strains were new species.

Characterisation of 'Candidatus Methylobacter titanis' sp. nov., a putative novel species of Methylobacter clade 2 and their distribution in sediments of freshwater lakes in maritime Antarctica.

Global warming has a strong impact on the polar regions, in particular, the Antarctic Peninsula and nearby islands. Methane (CH) is a major factor in climate change and mitigation of CH emissions can be accomplished through microbial oxidation by methanotrophic bacteria. Understanding this biological process is crucial given the shortage of research carried out in this geographical area.

Synthetic Biology Toolbox for Antarctic sp. Strains: Toward a Psychrophilic Nonmodel Chassis for Function-Driven Metagenomics.

One major limitation of function-driven metagenomics is the ability of the host to express the metagenomic DNA correctly. Differences in the transcriptional, translational, and post-translational machinery between the organism to which the DNA belongs and the host strain are all factors that influence the success of a functional screening. For this reason, the use of alternative hosts is an appropriate approach to favor the identification of enzymatic activities in function-driven metagenomics.

Diversity and Effect of Increasing Temperature on the Activity of Methanotrophs in Sediments of Fildes Peninsula Freshwater Lakes, King George Island, Antarctica.

Global warming has a strong impact on polar regions. Particularly, the Antarctic Peninsula and nearby islands have experienced a marked warming trend in the past 50 years. Therefore, higher methane (CH) emissions from this area could be expected in the future.

sp. nov., isolated from a root nodule of .

Strain UY79 was isolated from a root nodule of , collected at the Esteros de Farrapos National Park, Río Negro, Uruguay. Cells were non-motile Gram-variable rods with central to subterminal oval to ellipsoidal endospores that swell the sporangia. Growth was observed in the range of 15-42 °C (optimum, 30 °C), pH 5.

Frigoriflavimonas asaccharolytica gen. nov., sp. nov., a novel psychrophilic esterase and protease producing bacterium isolated from Antarctica.

The rod-shaped and Gram-stain-negative bacterial strain 16F, isolated from an air sample collected at King George Island, maritime Antarctica, was investigated to determine its taxonomic status. Strain 16F is strictly aerobic, catalase positive, oxidase positive and non-motile. Strain 16F hydrolyses casein, lecithin, Tween 20, 60 and 80, but not aesculin, gelatin and starch.

sp. nov., an airborne bacterium isolated from King George Island, Antarctica.

A rod-shaped and Gram-stain-negative bacterial strain 9A, was isolated from an air sample collected at King George Island, maritime Antarctica. Phylogenetic analysis based on 16S rRNA gene sequence reveals that strain 9A belongs to the genus and shows the highest similarity to CCM 8649 (96.8 %).

sp. nov., isolated from air sampling in maritime Antarctica.

A rod-shaped and Gram-stain-negative bacterial strain, 1B, was isolated from an air sample collected at King George Island, maritime Antarctica. Strain 1B is strictly aerobic, psychrophilic, catalase-positive, oxidase-positive and non-motile. Growth of strain 1B is observed at 0-20 °C (optimum, 10 °C), pH 6.