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. Author manuscript; available in PMC: 2019 Dec 3.
Published in final edited form as: Biochemistry. 2018 Jan 12;57(5):574–584. doi: 10.1021/acs.biochem.7b01151

Figure 4.

Figure 4.

(A) HiDapE open conformation showing the distal location of H194.B. (B) Proposed oxyanion hole formed by H194.B and Zn2 in the catalytically active closed form of HiDapE.