Histidine --> carboxamide ligand substitutions in the zinc binding site of carbonic anhydrase II alter metal coordination geometry but retain catalytic activity.
Lesburg, C.A., Huang, C., Christianson, D.W., Fierke, C.A.(1997) Biochemistry 36: 15780-15791
- PubMed: 9398308 
- DOI: 10.1021/bi971296x
- Primary Citation of Related Structures:  
- PubMed Abstract: 
The catalytic zinc ion of human carbonic anhydrase II (CAII) is coordinated by three histidine ligands (H94, H96, and H119) and a hydroxide ion with tetrahedral geometry. Structural and functional analysis of variants in which the zinc ligands H94 an ...