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Since the initial observation that GTP reacted with a soluble protein factor(s), present in an ammonium chloride extract of E. coli ribosomes, to form a complex that was retained on a nitrocel- lulose filter (11), it has been shown that both transfer factors, Ts and Tu, are required to form the GTP complex (6,8).
Two processes convert ADP into ATP: 1) substrate-level phosphorylation; and 2) chemiosmosis. Substrate-level phosphorylation occurs in the cytoplasm when an enzyme attaches a third phosphate to the ADP (both ADP and the phosphates are the substrates on which the enzyme acts).This is illustrated in Figure 3.s the hydrogen passes through the ATP synthesizing enzyme, energy from the enzyme is used to attach a third phosphate to ADP, converting it to ATP. Figure 5. A generalized view of an electron transport system.