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In chemistry, the term "turnover number" has two distinct meanings.. In enzymology, the turnover number (k cat) is defined as the limiting number of chemical conversions of substrate molecules per second that a single active site will execute for a given enzyme concentration [E T] for enzymes with two or more active sites. [1]
where + (forward rate constant), (reverse rate constant), and (catalytic rate constant) denote the rate constants, [14] the double arrows between A (substrate) and EA (enzyme-substrate complex) represent the fact that enzyme-substrate binding is a reversible process, and the single forward arrow represents the formation of P (product).
The main difference between ribozymes and enzymes is that RNA catalysts are composed of nucleotides, whereas enzymes are composed of amino acids. Ribozymes also perform a more limited set of reactions, although their reaction mechanisms and kinetics can be analysed and classified by the same methods.
The reaction catalyzed by CA1 is the same as other carbonic anhydrase family proteins: + (in tissues - high CO 2 concentration) [9]. The CA1-catalyzed reaction has a relatively low reaction affinity (Km) of 4.0 mM for CO 2, [7] [10] turnover number (Kcat) of 2 × 10 5 s −1, and catalytic efficiency (Kcat/Km) of 5 × 10 7 M −1 s −1 comparing to other isozymes of the α-CA family of ...
An active site titration process can be done for the elimination of errors arising from differences in cultivation batches and/or misfolded enzyme and similar issues. This is a measure of the amount of active enzyme, calculated by e.g. titrating the amount of active sites present by employing an irreversible inhibitor.
This page was last edited on 3 July 2015, at 02:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
Whether you love or hate sparkling water, you may be wondering if it's as beneficial or hydrating as still water. Dietitians explain the differences between sparkling and still water and which ...
An anhydrase is defined as an enzyme that catalyzes the removal of a water molecule from a compound, and so it is this "reverse" reaction that gives carbonic anhydrase its name, because it removes a water molecule from carbonic acid. In the lungs carbonic anhydrase converts bicarbonate to carbon dioxide, suited for exhalation.