Other endoglycosidases, similar to PNGase F, include endoglycosidase F1, endoglycosidase F2, endoglycosidase F3, and endoglycosidase H . These endoglycosidases have more specificity in cleavage and are less sensitive to protein conformation than PNGase F . All of these endoglycosidases, including PNGase F, can be purified from an almond emulsion or " flavobacterium meningosepticum ".
12.
Other striking examples are the bacteria " Escherichia coli " evolving the ability to use citric acid as a nutrient in a long-term laboratory experiment, " Flavobacterium " evolving a novel enzyme that allows these bacteria to grow on the by-products of nylon manufacturing, and the soil bacterium " Sphingobium " evolving an entirely new metabolic pathway that degrades the synthetic pesticide pentachlorophenol.
