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. Author manuscript; available in PMC: 2013 Nov 6.
Published in final edited form as: Biochemistry. 2012 Oct 29;51(44):8755–8763. doi: 10.1021/bi301115c

Scheme 1.

Scheme 1

Proposed reaction mechanism for extradiol dioxygenases. In the case of FeHPCD, R is –CH2COO (optimal substrate HPCA) or –NO2 (alternative substrate 4NC), B(H) is His200. The ring carbon numbering system shown is adopted for both substrates for ease of presentation.