We usually think of enzymes as being most active at around 37^∘ C, yet in PCR the DNA polymerase

step 1 Let's talk about TAC polymerase, a specific type of polymerase used in PCR. Polymerase to review

We usually think of enzymes as being most active at around...

We usually think of enzymes as being most active at around $37^{\circ} \mathrm{C},$ yet in $\mathrm{PCR}$ the DNA polymerase is subjected to multiple exposures of relatively high temperatures and seems to function appropriately at $65-75^{\circ} \mathrm{C}$. What is special about the DNA polymerase typically used in PCR?

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Key Concepts

Polymerase Chain Reaction (PCR)

PCR is a laboratory technique used to amplify specific segments of DNA through repeated cycles of temperature changes. Each cycle includes steps that require high temperatures for DNA denaturation and lower temperatures for primer annealing and extension. The process depends on enzymes like thermostable DNA polymerases to perform DNA replication efficiently throughout the cycling process.

Thermophilic Enzymes

Thermophilic enzymes are derived from organisms that live in extremely hot environments. These enzymes have evolved structural features that enable them to maintain their activity at high temperatures. In PCR, using a thermophilic DNA polymerase, such as one from a heat-loving bacterium, ensures that the enzyme remains active during the high-temperature denaturation steps and subsequent cycles.

Thermostability

Thermostability refers to the ability of a molecule, particularly enzymes, to remain stable and functional at high temperatures. In the context of PCR, thermostable enzymes are crucial because they must withstand repeated cycles of heating without denaturing, allowing them to perform the necessary biochemical reactions even after multiple exposures to elevated temperatures.

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