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This means that enzymes specifically react with only one or a very few similar compounds. Lock and Key Theory: The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy first postulated in 1894 by Emil Fischer. In this analogy, the lock is the enzyme and the key is the substrate.


The lock-and-key model refers to the way in which a substrate binds to an enzyme's active site. Similar to how a key has to be the correct one for a lock, no reaction takes place if an incorrect substrate tries to bind. The active site of an enzyme is a specific region that receives the substrate.


In fact, an early model describing the formation of the enzyme-substrate complex was called the lock-and-key model A model that portrays an enzyme as conformationally rigid and able to bond only to a substrate or substrates that exactly fit the active site. (Figure 18.11 "The Lock-and-Key Model of Enzyme Action"). This model portrayed the ...


The lock and key model is a basic explanation of how an enzyme works. The active site is considered the lock, and the substrate the key. When the lock and key combine, they are able to form a new ...


Enzymes are biological catalysts which speed up reactions. They are specific for their substrate. The lock and key hypothesis models this. Enzymes are denatured at extremes of temperature and pH.


Then, in 1958, Daniel Koshland modified the lock and key theory with the induced fit model, claiming that enzymes are partially flexible and that the active site of the enzyme will reshape to fit ...


Consequently, an enzyme reduces the activation energy of biological reaction, which it catalyzes. Two main theories are used to explain how enzyme-substrate complexes form. They are lock-and-key theory and induced-fit theory. Lock-and-Key Model. Enzymes have very precise shape, which includes a cleft or pocket called active sites.


What is Lock and Key? Lock and Key is one of the theories that explain the mode of action of an enzyme which catalyzes a reaction. Emil Fischer proposed this theory in 1894. According to lock and key hypothesis, the binding of the substrate into an active site of an enzyme is equalized into the lock and key mechanism.


Lock and Key Hypothesis. In order to explain why enzymes have such a high level of specificity, Emil Fischer in 1894 suggested that both a substrate and an enzyme have specific geometric shapes that fit exactly into each other. This idea of both substrates and enzymes having a natural geometric fit has been called the lock and key hypothesis.