The art of adapting to extreme environments: The model system Pseudoalteromonas

Parrilli, Ermenegilda; Tedesco, Pietro; Fondi, Marco; Tutino, Maria; Giudice, Angelina Lo; Pascale, Donatella de; Fani, Renato

doi:10.1016/j.plrev.2019.04.003

Cited by 57 publications

(29 citation statements)

References 141 publications

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“…According to Jain and Krishnan [51], being one of the predominant genera associated with marine particles, this genus probably thrives on algal bloom byproducts. The genera Pseudoalteromonas and Marinicella, which are both commonly retrieved in marine environments, were more abundant in water and sediments, respectively [52,53].…”

Section: Discussionmentioning

confidence: 99%

Bacterial Diversity in a Dynamic and Extreme Sub-Arctic Watercourse (Pasvik River, Norwegian Arctic)

Papale

Rappazzo

Mikkonen

et al. 2020

Water

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Microbial communities promptly respond to the environmental perturbations, especially in the Arctic and sub-Arctic systems that are highly impacted by climate change, and fluctuations in the diversity level of microbial assemblages could give insights on their expected response. 16S rRNA gene amplicon sequencing was applied to describe the bacterial community composition in water and sediment through the sub-Arctic Pasvik River. Our results showed that river water and sediment harbored distinct communities in terms of diversity and composition at genus level. The distribution of the bacterial communities was mainly affected by both salinity and temperature in sediment samples, and by oxygen in water samples. Glacial meltwaters and runoff waters from melting ice probably influenced the composition of the bacterial community at upper and middle river sites. Interestingly, marine-derived bacteria consistently accounted for a small proportion of the total sequences and were also more prominent in the inner part of the river. Results evidenced that particular conditions occurring at sampling sites (such as algal blooms, heavy metal contamination and anaerobiosis) may select species at local scale from a shared bacterial pool, thus favoring certain bacterial taxa. Conversely, the few phylotypes specifically detected in some sites are probably due to localized external inputs introducing allochthonous microbial groups.

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Section: Discussionmentioning

confidence: 99%

Bacterial Diversity in a Dynamic and Extreme Sub-Arctic Watercourse (Pasvik River, Norwegian Arctic)

Papale

Rappazzo

Mikkonen

et al. 2020

Water

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“…A single OTU assigned to the genus Pseudoalteromon as, which was numerous in the chemocline zone as well, was responsible for this heterogeneity. Pseudoalteromonas species are a group of mostly aerobic marine bacteria frequently found in various environments, including cold habitats and deep-sea sediments ( Parrilli et al, 2019 ). In the samples collected from the depths of 0.5, 2, 3, 4, and 15 m in September, as well as in all March samples, the share of this OTU did not exceed 1%.…”

Section: Resultsmentioning

confidence: 99%

Microbial Processes and Microbial Communities in the Water Column of the Polar Meromictic Lake Bol’shie Khruslomeny at the White Sea Coast

et al. 2020

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Microbiological, molecular ecological, biogeochemical, and isotope geochemical research was carried out at the polar Lake Bol'shie Khruslomeny at the coast of the Kandalaksha Bay, White Sea in March and September 2017. The uppermost mixolimnion was oxic, with low salinity (3-5%). The lower chemocline layer was browngreen colored, with very high content of particulate organic matter (up to 11.8 mg C L −1). The lowermost monimolimnion had marine salinity (22-24%) and very high concentrations of sulfide (up to 18 mmol L −1) and CH 4 (up to 1.8 mmol L −1). In the chemocline, total microbial abundance and the rate of anoxygenic photosynthesis were 8.8 × 10 6 cells mL −1 and 34.4 µmol C L −1 day −1 , respectively. Both in March and September, sulfate reduction rate increased with depth, peaking (up to 0.6-1.1 µmol S L −1 day −1) in the lower chemocline. Methane oxidation rates in the chemocline were up to 85 and 180 nmol CH 4 L −1 day −1 in March and September, respectively; stimulation of this process by light was observed in September. The percentages of cyanobacteria and methanotrophs in the layer where light-induced methane oxidation occurred were similar, ∼2.5% of the microbial community. Light did not stimulate methane oxidation in deeper layers. The carbon isotope composition of particulate organic matter (δ 13 C-Corg), dissolved carbonates (δ 13 C-DIC), and methane (δ 13 C-CH 4) indicated high microbial activity in the chemocline. Analysis of the 16S rRNA gene sequences revealed predominance of Cyanobium cyanobacteria (order Synechococcales) in the mixolimnion. Green sulfur bacteria Chlorobium phaeovibrioides capable of anoxygenic photosynthesis constituted ∼20% of the chemocline community both in March and in September. Methyloprofundus gammaptoteobacteria (family Methylomonaceae) were present in the upper chemocline, where active methane oxidation occurred. During winter, cyanobacteria were less abundant in the chemocline, while methanotrophs occurred in higher horizons, including the under-ice layer. Chemolithotrophic gammaproteobacteria of the genus Thiomicrorhabdus, oxidizing

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“…In coastal and marine sediments, however, several reports have shown that glycine concentration in sediment pore water as well as sediment traps can reach hundreds of μM 34,35 . Coincidently, Pseudoalteromonas is frequently detected as an important member of the microbial community in marine sediments 36,37 . It is therefore likely that pseudoalterinmediate predation may occur in marine sediments where the Gly concentration for inducing pseudoalterin expression can be achieved locally.…”

Section: Discussionmentioning

confidence: 99%

A predator-prey interaction between a marine Pseudoalteromonas sp. and Gram-positive bacteria

et al. 2020

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Predator-prey interactions play important roles in the cycling of marine organic matter. Here we show that a Gram-negative bacterium isolated from marine sediments (Pseudoalteromonas sp. strain CF6-2) can kill Gram-positive bacteria of diverse peptidoglycan (PG) chemotypes by secreting the metalloprotease pseudoalterin. Secretion of the enzyme requires a Type II secretion system. Pseudoalterin binds to the glycan strands of Gram positive bacterial PG and degrades the PG peptide chains, leading to cell death. The released nutrients, including PG-derived D-amino acids, can then be utilized by strain CF6-2 for growth. Pseudoalterin synthesis is induced by PG degradation products such as glycine and glycine-rich oligopeptides. Genes encoding putative pseudoalterin-like proteins are found in many other marine bacteria. This study reveals a new microbial interaction in the ocean.

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The art of adapting to extreme environments: The model system Pseudoalteromonas

Cited by 57 publications

References 141 publications

Bacterial Diversity in a Dynamic and Extreme Sub-Arctic Watercourse (Pasvik River, Norwegian Arctic)

Bacterial Diversity in a Dynamic and Extreme Sub-Arctic Watercourse (Pasvik River, Norwegian Arctic)

Microbial Processes and Microbial Communities in the Water Column of the Polar Meromictic Lake Bol’shie Khruslomeny at the White Sea Coast

A predator-prey interaction between a marine Pseudoalteromonas sp. and Gram-positive bacteria

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