How do the same enzymes have distinct optimal values of pH and temperature depending on the source organism?
The same enzymes vary in primary structure between species. It results in the formation of some different interactions, which maintain the shape of the enzyme. For example, the same enzymes of thermophylic species are likely to have more weak bonds, maintaining their structure compared to species living at the normal temperatures. Variation in the number of ionic bonds can be the factor, which affects the ability of enzyme to function under the differnt pH values.