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Figure 3
Zinc-bound PA4063 structure. (a) Superimposition of apo (yellow) and zinc-bound (blue) PA4063 from the hexagonal crystal form. The anomalous difference density map (orange mesh), contoured at 5σ, unequivocally locates two zinc-binding sites. (b) Superimposition of apo (green) and zinc-bound (magenta) PA4063 from the better-diffracting tetragonal crystal form. The difference map (mFo − DFc, green mesh), set to 3σ, confirms the position of the zinc ions. (c) and (d) show the details of zinc coordination in sites a and b, respectively.

Journal logoSTRUCTURAL
BIOLOGY
ISSN: 2059-7983
Volume 77| Part 11| November 2021| Pages 1401-1410
https://doi.org/10.1107/S2059798321009608
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