Cataplexy 发表于 2025-3-21 16:28:04
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The Limits For Life Define The Limits For EnzymesFor metabolic enzymes .cat’s must be ≥1 s–1, and are generally 10–3,000 s–1. It then follows that for metabolic enzymes . values are generally limited to be between 1 μM and 1 mM. While increased . values would enable much faster .cat’s, there is a clear need for enzymes to be sufficiently discrimin公共汽车 发表于 2025-3-22 04:24:20
Enzyme Kinetics–Burk, Eadie– Hofstee, and Hill. The . binding range for a ligand with constant affinity is nearly 100-fold. At ≤ 0.1.d, binding becomes ineffective. At ≥ 10.d, binding approaches saturation. This effective binding range is easily remembered as the .. The effect of positive cooperativity isYourself 发表于 2025-3-22 06:38:00
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Kinetics Of Allosteric Enzymesfor the different subunits. Most .-type enzymes have positive cooperativity; a limited number of regulatory enzymes have negative cooperativity. This controlled change in affinity makes the enzyme more sensitive to changes in substrate concentration (positive cooperativity), or dampens the enzyme’sHarpoon 发表于 2025-3-22 13:28:13
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Phosphofructokinasee smaller enzyme in microbes has versions that may use ATP, ADP, or pyrophosphate as the phosphate donor. These enzymes are normally inhibited by phosphoenolpyruvate and activated by AMP. The larger enzyme uses ATP, and has additional regulatory sites. A special site for fructose-2,6-bisphosphate haSystemic 发表于 2025-3-23 02:31:01
Ribonucleotide Reductasein a reducing environment, additional forms evolved to function in an aerobic state. While the different classes of this enzyme have different cofactors, and different mechanisms for generating the free radical necessary for the reaction, they have retained many of the key regulatory features. Most的事物 发表于 2025-3-23 08:43:26
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