Refined structure of human carbonic anhydrase II at 2.0 A resolution.Eriksson, A.E., Jones, T.A., Liljas, A.
(1988) Proteins 4: 274-282
- PubMed: 3151019
- DOI: 10.1002/prot.340040406
- Primary Citation of Related Structures:  4CAC, 5CAC
- Also Cited By: 2HD6, 2HL4, 2HOC, 3BET, 3CZV, 3T5U, 3T5Z
- PubMed Abstract:
- Crystal Structure of Human Carbonic Anhydrase C
Liljas, A.,Kannan, K.K.,Bergsten, P.-C.,Waara, I.,Fridborg, K.,Strandberg, B.,Carlbom, U.,Jarup, L.,Lovgren, S.,Petef, M.
(1972) Nature New Biol. 235: 131
- Structural Relationship of Human Erythrocyte Carbonic Anhydrase Isozymes B and C
Notstrand, B.,Vaara, I.,Kannan, K.K.
(1975) Isozymes-Molecular Structure 1: 575
- Crystal Structure of Human Erythrocyte Carbonic Anhydrase C. Vi. The Three-Dimensional Structure at High Resolution in Relation to Other Mammalian Carbonic Anhydrases
Kannan, K.K.,Liljas, A.,Waara, I.,Bergsten, P.-C.,Lovgren, S.,Strandberg, B.,Bengtsson, U.,Carlbom, U.,Fridborg, K.,Jarup, L.,Petef, M.
(1972) Cold Spring Harbor Symp.Quant.Biol. 36: 221
- Crystallographic Studies of Inhibitor Binding Sites in Human Carbonic Anhydrase II. A Pentacoordinated Binding of the Scn-Ion to the Zinc at High Ph
Eriksson, A.E.,Kylsten, P.M.,Jones, T.A.,Liljas, A.
(1988) Proteins 4: 283
The structure of human erythrocytic carbonic anhydrase II has been refined by constrained and restrained structure-factor least-squares refinement at 2.0 A resolution. The conventional crystallographic R value is 17.3%. Of 167 solvent molecules assoc ...
The structure of human erythrocytic carbonic anhydrase II has been refined by constrained and restrained structure-factor least-squares refinement at 2.0 A resolution. The conventional crystallographic R value is 17.3%. Of 167 solvent molecules associated with the protein, four are buried and stabilize secondary structure elements. The zinc ion is ligated to three histidyl residues and one water molecule in a nearly tetrahedral geometry. In addition to the zinc-bound water, seven more water molecules are identified in the active site. Assuming that Glu-106 is deprotonated at pH 8.5, some of the hydrogen bond donor-acceptor relations in the active site can be assigned and are described here in detail. The O gamma 1 atom of Thr-199 donates its proton to the O epsilon 1 atom of Glu-106 and can function as a hydrogen bond acceptor only in additional hydrogen bonds.
Department of Molecular Biology, Biomedical Center, Uppsala, Sweden.