Diversity of bacteria from Antarctica, Arctic, Himalayan glaciers and Stratosphere

Shivaji, Sisinthy; Chattopadhyay, M. K.; Reddy, Gundlapadly S

doi:10.16943/ptinsa/2019/49717

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…They are reported to use trace gases as an energy source and can also produce metabolic water for hydration needs [19]. Indian expeditions to polar regions have also led to the identification of more than 40 psychrophilic microbes from the Arctic and Antarctic regions that are reported to have biotechnologically important extremozymes [20]. Studying microbial diversity in these areas is immensely crucial to understanding the functioning of these ecosystems and further research will surely identify novel endemic microorganisms having particular characteristics that can be useful for mankind.…”

Section: Microbial Diversity In Polar Regionsmentioning

confidence: 99%

Microbial Journey: Mount Everest to Mars

et al. 2022

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A rigorous exploration of microbial diversity has revealed its presence on Earth, deep oceans, and vast space. The presence of microbial life in diverse environmental conditions, ranging from moderate to extreme temperature, pH, salinity, oxygen, radiations, and altitudes, has provided the necessary impetus to search for them by extending the limits of their habitats. Microbiology started as a distinct science in the mid-nineteenth century and has provided inputs for the betterment of mankind during the last 150 years. As beneficial microbes are assets and pathogens are detrimental, studying both have its own merits. Scientists are nowadays working on illustrating the microbial dynamics in Earth's subsurface, deep sea, and polar & Vipin Chandra Kalia

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Section: Microbial Diversity In Polar Regionsmentioning

confidence: 99%

Microbial Journey: Mount Everest to Mars

et al. 2022

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“…Therefore, our understanding of the way in which cellular integrity and functionality intersects with the thermodynamic parameter temperature lies at the very heart of astrobiology. There has been a considerable research effort dedicated to understanding the in situ ecology, cellular physiology, and molecular machinery of the terrestrial microbes that are capable of metabolism and proliferation at sub‐zero temperatures (Cid et al ., 2016; Shivaji et al ., 2019; Sajjad et al ., 2020). Many other studies have focused on the cold tolerance of mesophilic microbes, most of which cease growth in the range 15 to 7°C (Ferrer et al ., 2003; Stevenson et al ., 2017a; Engqvist, 2018).…”

Section: Introductionmentioning

confidence: 99%

Molecular insights into the ecology of a psychrotolerant Pseudomonas syringae

Pavankumar

Mittal

Hallsworth

2020

Environmental Microbiology

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Low temperatures constrain cellular life due to reductions in nutrient uptake, enzyme kinetics, membrane permeability, and function of other biomacromolecules. This has implications for the biophysical limits of life on Earth, and the plausibility of life in extraterrestrial locations. Although most pseudomonads are mesophilic in nature, isolates such as the Antarctic Pseudomonas syringae Lz4W exhibit considerable psychrotolerance, with an ability to grow even between 4 and 0 C. In this review, we explore the molecular traits and characteristic phenotypes of P. syringae Lz4W that enable life at low temperatures. We describe adaptations that enhance membrane fluidity; examine genes involved in cellular function and survival in the cold; assess capability for energy generation at low temperature; and detail the mechanics of DNA repair and RNA processing at low temperature, and speculate that P. syringae Lz4W can also synthesize glycerol to maintain flexibility of macromolecular systems. In the range 4 to 0ºC, there are considerable changes in the properties and behaviour of water. Specifically, density can have adverse impacts on plasma-membrane functions, cytoplasmic viscosity, protein behaviour, and other essential properties of cellular system. We identified a combination of adaptations that may be peculiar to cold-tolerant P. syringae, including increase of unsaturated fatty acids in the plasma membrane; a RNA polymerase able to function at 0 C; RecBCD-and RuvAB-dependent reestablish ment of replication fork; and efficiencies of degradosome machinery and RNA processing by RNaseR at low temperature. Several unresolved questions are discussed in the context of astrobiology, and further work needed on the psychrotolerance of P. syringae.

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Diversity of bacteria from Antarctica, Arctic, Himalayan glaciers and Stratosphere

Cited by 2 publications

References 36 publications

Microbial Journey: Mount Everest to Mars

Microbial Journey: Mount Everest to Mars

Molecular insights into the ecology of a psychrotolerant Pseudomonas syringae

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