What are the conditions for thermoacidophiles?

What is the source of energy for thermoacidophiles?

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Thermophilic bacteria and archaea thrive at temperatures (T) above 70C by utilizing metabolic pathways, which operate at higher T than their mesophilic counterparts. An ATPase, chaperone, and protease are essential for assembly, and have T~1/2~ > 80C. In the absence of this system, the 70S ribosome is formed in a reversible reaction. The 70S ribosome complex dissociates into its components at a T of 85C.

We speculate that energy for thermoacidophiles is generated by thermophilic anaerobes during the course of energy generation. The hydrogen ions resulting from hydrogen gas, CO, acetate, methanol, and butyrate reduction are utilized in metabolism; their T~1/2~ is 200C.

To investigate this hypothesis, we examined the genomes of various thermoacidophiles for enzymes required to form thermochemically active hydrogen gas (H~2~).

What are the conditions for thermoacidophiles?

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Thermoacidophiles are microorganisms that thrive in environments with extreme acidity and temperature conditions. They have been isolated from high-temperature geothermal springs, marine hot vents, and other natural environments. These microorganisms are mostly thermophilic, meaning that they are adapted to grow at temperatures between 50C and 80C. Thermoacidophiles do not grow well at temperatures higher than 90C. Thermophiles are also thermotolerant, meaning that they are able to survive the lower temperatures required for growth. In contrast, thermoacidophiles are acidophiles that grow well at temperatures higher than the optimal growth temperatures of thermophiles.

The first thermoacidophilic bacteria were isolated from the high-temperature volcanic environment of Yellowstone National Park (YNP) in the early 20th century. These two species of bacteria are archaea that belong to the Crenarchaeota branch of the Euryarchaeota. All of these archaea have cell walls that contain a variety of glycolipids and glycoproteins (Wool et al. These two species of bacteria belong to the phylum Firmicutes, which are bacteria with a peptidoglycan layer in their cell walls. Another good resource for thermoacidophiles is the website Thermoacidophiles.net.

What are the conditions for acidophiles? Acidophiles are microorganisms that grow well in environments with low pH. Acidophiles grow well at pH between 2.0 and 6.

Are thermoacidophiles heterotrophic or autotrophic?

Thermoacidophiles seem to lack many of the typical features associated with autotrophic bacteria (photoautotrophs), such as the ability to carry out photosynthesis. But the authors of the paper describing this life-form state that they are not heterotrophic. So where does this leave us, with respect to how we should characterize them?

Thermoacidophiles are defined as acidophiles whose optimal growth temperature lies in or near an acidic environment. It is possible for them to grow on organic matter as their sole source of carbon, yet a number of authors indicate that they are probably photoheterotrophic and not autotrophic. Some of these authors include:

Werner O. Friedrich, Brbel Ksel, Karl Heinz Held, Thermophilic Organisms, Berggren & Eriksson's Enzyklopdie der bacterienforschung. Springer, Berlin, 2024, pp. 855-856.

Anil Sethi and Muthukumar, Growth of Thermophilic Organisms on Organic Matter, Current Microbiology Vol 38:1-2 (1996), pp. 39-46 Ruth Rosenberger & Peter Stocks, The biology of extremophiles, Microbiological reviews Volume 60: 1-38, 2024. In the latter two sources, the authors indicate: Friedrich et al. (2002) describe the growth of Thermotoga maritima on organic compounds, citing that it produces biomass from acetate, lactate, glucose, fructose and succinate. This suggests that the organism is heterotrophic.

Sethi et al. (1996) state that the same organism will also use carbohydrates, peptides and amino acids, but is able to utilize such substances after being grown in an electron donor rich medium containing thiosulfate as the primary terminal electron acceptor.