How is this possible? If you believed Michael Behe's assertion that biochemical machines were irreducibly complex, you might never bother to check, and this is the real scientific danger of his ideas. Musser and Chan did check, and found that two of the six proteins in the proton pump were quite similar to a bacteria enzyme known as the cytochrome bo 3 complex. Could this mean that part of the proton pump evolved from a working cytochrome bo 3 complex? Certainly.
FosC uses ATP and adds a phosphate group to fosfomycin, thus altering its properties and making the drug ineffective. 
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Microbes simply secrete digestive enzymes into their surroundings,   while animals only secrete these enzymes from specialized cells in their guts , including the stomach and pancreas , and salivary glands .  The amino acids or sugars released by these extracellular enzymes are then pumped into cells by active transport proteins.  
This new edition of the iconic IUBMB-Sigma-Nicholson Metabolic Pathways Chart brings increased functionality to a canonical tool. Now, all metabolites ...