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. Author manuscript; available in PMC: 2010 Jul 7.
Published in final edited form as: Biochemistry. 2009 Jul 7;48(26):6146–6156. doi: 10.1021/bi900663h

Scheme 1.

Scheme 1

Structural schematic of key active site and noncatalytic bicarbonate binding site interactions in the hypothesized active (R-state) and inactive (T-state) conformations of HICA (12).