How does enzymes effects the temperature on the rate of reaction?
The effects of temperature may be explained on the basis of kinetic theory – increased temperature increases the speed of molecular movement and thus the chances of molecular collisions, so within a narrow range (often 0-45 °C), the rate of reaction is proportional to the temperature. It is often said that an enzyme’s rate of reaction doubles for every10° C rise in temperature. In this respect, the biochemistry of enzymes is similar to chemistry as studied elsewhere, However, the interaction between this positive effect of increased temperature and the negative effect described below results in a different situation, so that enzymes may be said to have an optimum temperature for their action. 4 Above normal temperatures (say 60 °C), heat alters irreversibly the enzyme molecule. This denaturation is due to molecular vibrations (caused by heat) which change the shape of the protein, altering the folding and internal cross-linkages in its polypeptide chains. These changes – especially in
