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. Author manuscript; available in PMC: 2008 Jun 19.
Published in final edited form as: Chem Rev. 2006 Feb;106(2):215–232. doi: 10.1021/cr0404702

Figure 5.

Figure 5

A Cys4Zn cluster accumulates negative charges. A Cys residue, which may transiently dissociate from the zinc(II) center while still kept as the deprotonated form, can attack a methylphos-photriester to transfer the methyl group.