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. 2007 Nov 26;14(11):1243–1253. doi: 10.1016/j.chembiol.2007.10.013

Figure 5.

Figure 5

Proposed Reaction Mechanism for Human PPT

Residue E181 is the acid/base catalyst that abstracts a proton from Ser2156 of ACP, and cleavage of the pyrophosphate bond is achieved after charge migration and protonation of the α-phosphate likely achieved through Lys185, resulting in dissociation of the products from PPT.