Concept explainers
One Tough Bug The genus Ferroplasma consists of a few species of acid-loving archaea. One species, Ferroplasma acidarmanus, was discovered in one of the most contaminated sites in the United States: Iron Mountain Mine in California. F. acidarmamus is the main constituent of .slime streamers (a type of biofilm) growing in water draining from this abandoned copper mine (right). The water is hot (about 40°C, or 104°F), heavily laden with arsenic and other toxic metals, and has a pH of zero.
F. acidarmanus cells have an ancient energy-harvesting pathway that uses electrons pulled from iron-sulfur compounds in minerals such as pyrite. Removing electrons from these compounds dissolves the minerals, so groundwater in the mine ends up with extremely high concentrations of solutes, including metal ions such as copper, zinc, cadmium, and arsenic. The pathway also produces .sulfuric acid, which lowers the pH of the water around the cell to zero.
F. acidarmanus cells keep their internal pH at a cozy 5.0 despite Living in an environment similar to hot battery acid. However, most of the cell’s enzymes function best al much lower pH (FIGURE 5.13). Thus, researchers think F. acidarmanus may have an unknown type of internal compartment that keeps their enzymes in a highly acidic environmental.
FIGURE 5.13 pH anomaly of Ferroplasma acidarmanus.
Left graphs showing pH activity profile of four enzymes isolated from Ferraplasma acidarmanus Researchers had expected all of these enzymes to function best at the calls’ cytoplasmic pH (5.0).
Of the four enzymes profiled in the graphs, how many function optimally at a pH lower than 5? How many retain significant function at pH 5?
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- The genus Ferroplasma consists of a few species of acid-loving archaea. One species, F. acidarmanus, was discovered to be the main component of slime streamers (a type of biofilm) deep inside an abandoned California copper mine (Figure 4.11A). F. acidarmanus cells use an ancient energy-harvesting pathway that combines oxygen with ironsulfur compounds in minerals such as pyrite. This reaction dissolves the minerals, so groundwater that seeps into the mine ends up with extremely high concentrations of metal ions such as copper, zinc, cadmium, and arsenic. The reaction also produces sulfuric acid, which lowers the pH of the water around the cells to zero. Despite living in an environment with a composition similar to hot battery acid, F. acidarmanus cells maintain their internal pH at a cozy 5.0. Thus, researchers investigating Ferroplasma metabolic enzymes were surprised to discover that most of the cells enzymes function best at very low pH (Figure 4.11B). A. Deep inside one of the most toxic sites in the United States: Iron Mountain Mine, in California. The water in this stream, which is about 1 meter (3 feet) wide in this photo, is hot (around 40C, or 104F), heavily laden with arsenic and other toxic metals, and has a pH of zero. Slime streamers growing in it are a biofilm dominated by a species of archaea, Ferroplasma acidarmanus. B. pH profiles of four enzymes isolated from F. acidarmus. Researchers had expected these enzymes to function best at the cells cytoplasmic pH (5.0). What does the dashed line signify?arrow_forwardOne Tough Bug The genus Ferroplasma consists of a few species of acid-loving archaea. One species, Ferroplasma acidarmanus, was discovered in one of the most contaminated sites in the United States: Iron Mountain Mine in California. F. acidarmamus is the main constituent of .slime streamers (a type of biofilm) growing in water draining from this abandoned copper mine (right). The water is hot (about 40C, or 104F), heavily laden with arsenic and other toxic metals, and has a pH of zero. F. acidarmanus cells have an ancient energy-harvesting pathway that uses electrons pulled from iron-sulfur compounds in minerals such as pyrite. Removing electrons from these compounds dissolves the minerals, so groundwater in the mine ends up with extremely high concentrations of solutes, including metal ions such as copper, zinc, cadmium, and arsenic. The pathway also produces .sulfuric acid, which lowers the pH of the water around the cell to zero. F. acidarmanus cells keep their internal pH at a cozy 5.0 despite Living in an environment similar to hot battery acid. However, most of the cells enzymes function best al much lower pH (FIGURE 5.13). Thus, researchers think F. acidarmanus may have an unknown type of internal compartment that keeps their enzymes in a highly acidic environmental. FIGURE 5.13 pH anomaly of Ferroplasma acidarmanus. Left graphs showing pH activity profile of four enzymes isolated from Ferraplasma acidarmanus Researchers had expected all of these enzymes to function best at the calls cytoplasmic pH (5.0). What is the optimal pH for the carboxylesterase?arrow_forwardWaterborne microorganisms can survive in water with small amounts of nutrients but thrive in polluted water, which is rich in nutrients. Why do you think that polluted water is considered rich in nutrients?arrow_forward
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