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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).
PLP is also found on glycogen phosphorylase in the liver, where it is used to break down glycogen in glycogenolysis when glucagon or epinephrine signals it to do so. However, this enzyme does not exploit the reactive aldehyde group, but instead utilizes the phosphate group on PLP to perform its reaction.nimals are auxotrophs for this enzyme co-factor and require it or an intermediate to be supplemented, hence its classification as a vitamin B 6, unlike MoCo or CoQ10 for example. PLP is synthesized from pyridoxal by the enzyme pyridoxal kinase, requiring one ATP molecule. PLP is metabolized in the liver.