Why in news?
The recent research studies shows that extremophile bacteria can survive not only in extreme environments but also in microwaves.
What are extremophile microbes?
- Microbes - They are microorganisms, tiny living organisms , that are too small to be seen with the naked eye.
- Microbes Type – Protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and also prions that are proteinacious infectious agents.
- Single or Multi cell - Microorganisms may be single-celled like bacteria, some algae and protozoa, or multicellular, such as many algae and fungi.
- Global Initiatives - Many global initiatives are currently trying to map, organise, and understand this diversity.
- Earth Microbiome Project - It was founded in 2010 to sequence 200,000 genetic samples and assemble 500,000 microbial genomes.
- Earth Biogenome Project - To sequence the genomes of all of the planet’s eukaryotic organisms to create one of the largest and most comprehensive maps of organisms
- Habitats - They live in all types of environment, ranging from ice cold climate to hot springs; and deserts to marshy lands.
- They are also found inside the bodies of animals including humans.
- Some microorganisms grow on other organisms while others exist freely.
- Extremophiles – Microbes that live in extreme natural conditions are called extremophiles.
- They have been found in
- Hydrothermal and volcanic vents
- Permafrost
- Dark lakes buried kilometres under polar ice caps
- Acid mines
- Around nuclear waste storage sites.
- Exteriors of spacecraft
Deinococcus radiodurans, an earth-born bacteria, could survive in outer space for more than three years, stuck to the outside of the International Space Station
- There are different types of extremophiles adapted to live in different extreme conditions.
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Extremophiles Types
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Description
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Examples
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Thermophiles
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These organisms live in extremely hot environments, such as hot springs or deep-sea hydrothermal vents.
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Thermus aquaticus and Pyrococcus furiosus.
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Psychrophiles
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These microbes thrive in extremely cold environments, such as polar ice caps and deep oceans.
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Psychrobacter cryohalolentis.
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Acidophiles
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Acid-loving microorganisms that grow in highly acidic environments with pH levels below 3.
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Ferroplasma acidarmanus and Acidithiobacillus ferrooxidans.
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Alkaliphiles
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These organisms prefer basic or alkaline environments with a pH above 9. They are often found in soda lakes.
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Alkalimonas universalis and Bacillus alcalophilus.
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Halophiles
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Salt-loving microbes that thrive in high-salt environments, such as salt mines and salt flats.
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Halobacterium salinarum and Halococcus salinarius.
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Barophiles
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These organisms live under extreme pressure, such as in the deep sea.
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Halomonas salaria and Deepleogaster formosus.
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Xerophiles
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These microbes can survive in extremely dry conditions, such as deserts. They have adaptations to conserve water and manage desiccation.
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Bacillus spores and Clostridium species.
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- Radiation Resistant Extremophiles - Microbes that are resistant to radiation, desiccation, and high temperatures have been found in domestic microwaves and research facilities.
What are the adaptations of extremophiles microbes?
- Microbes adapt to extreme environments by incorporating unique biological and biochemical processes.
- Proteins and Enzymes- Their proteins and enzymes are often more stable and functional under extreme conditions, such as high temperatures or acidic pH.
- Extremozymes - These organisms use unique enzymes, called extremozymes, which allow them to survive and function in harsh conditions.
- For example, thermophiles have heat-stable enzymes that are useful in industrial processes (e.g., PCR).
- Cell Membranes- They have unique membrane lipids that maintain fluidity and integrity under extreme temperatures or pressures.
- DNA Repair Mechanisms- Extremophiles have specialized mechanisms to repair DNA damage caused by extreme conditions, such as high radiation or desiccation.
What are their significance in science and industry?
- Understanding extremophiles could lead to advances in synthetic biology, disease resistance, and bioremediation.
- They offer potential for new medications and industrial applications.
- Enzyme development - Extremophiles produce enzymes and proteins that remain stable and active under extreme conditions.
- These enzymes are used in industries like detergents, biofuels, and pharmaceuticals.
- Example - Heat-resistant enzymes like Taq DNA polymerase from Thermus aquaticus bacteria from a hot spring at Yellowstone National Park , is used in Polymerase Chain Reaction( PCR).
- Bioremediation - Radiation Extremophiles are useful in bioremediation of toxic waste.
- Exoplanet search - Helps in understanding life in extreme environments, both on Earth and potentially on other planets.
- Medicine- Extremophiles’ unique proteins and metabolic pathways aid in creating new treatments and drugs, including antibiotics and other therapeutics.
- Genetic Research- Extremophiles’ unique genetic adaptations offer insights into gene regulation and stress responses, advancing genetic engineering.
- Understanding them can help in creating synthetic biological systems that can augment the immune system.
- Agriculture- Extremophiles can be used to develop crops that are more resistant to extreme conditions, helping improve food security in challenging environments.
References
1. The Hindu | Extremophile bacteria
2. Biolablest | Extremophiles
3. Britannica | Extremophile
