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. Author manuscript; available in PMC: 2012 Jul 12.
Published in final edited form as: Biochemistry. 2011 Jun 15;50(27):5999–6011. doi: 10.1021/bi200311u

Scheme 2.

Scheme 2

Proposed tautomerization of the distal histidine in oxyferrous DHP B upon trihalophenol binding. A direct interaction between His55 and TXP is depicted, however binding may occur elsewhere, leading to the proposed tautomerization.