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Comparison of the CheY conformation in F432YZ200-214 with “meta-active” apoCheY. The activation-sensitive α4β4α5 region of CheY molecules in BeF3−-free F432YZ200-214 (key features shown in cyan) and BeF3−-bound F432YZ200-214 (key features shown in deep blue) are superposed on “meta-active” apoCheY (1JBE)13 (key features shown in magenta) with side chains of key switch residues depicted in ball and stick models.
