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1UGG

HUMAN CARBONIC ANHYDRASE II[HCAII] (E.C.4.2.1.1) MUTANT WITH ALA 65 REPLACED BY SER (A65S)-ORTHORHOMBIC FORM

Summary for 1UGG
Entry DOI10.2210/pdb1ugg/pdb
DescriptorCARBONIC ANHYDRASE II, ZINC ION (3 entities in total)
Functional Keywordslyase (oxo-acid), acetylation, zinc, polymorphism, disease mutation
Biological sourceHomo sapiens (human)
Cellular locationCytoplasm: P00918
Total number of polymer chains1
Total formula weight29152.19
Authors
Scolnick, L.R.,Christianson, D.W. (deposition date: 1996-07-24, release date: 1997-01-27, Last modification date: 2024-04-03)
Primary citationScolnick, L.R.,Christianson, D.W.
X-ray crystallographic studies of alanine-65 variants of carbonic anhydrase II reveal the structural basis of compromised proton transfer in catalysis.
Biochemistry, 35:16429-16434, 1996
Cited by
PubMed Abstract: The three-dimensional structures of A65F, A65L, A65H, A65T, A65S, and A65G human carbonic anhydrase II (CAII) variants have been solved by X-ray crystallographic methods to probe the importance of residue 65 and the structural implications of its evolutionary drift in the greater family of carbonic anhydrase isozymes. Structure-activity relationships in this series of CAII variants are correlated with those established for other carbonic anhydrase isozymes. We conclude that a bulky side chain at position 65 hinders the formation of an effective solvent bridge between zinc-bound water and H64 and thereby hinders solvent-mediated proton transfer between these two groups [Jackman, J. E., Merz, K. M., Jr., & Fierke, C. A. (1996) Biochemistry 35, 16421-16428]. Despite the introduction of a polar hydroxyl group at this position, smaller side chains such as serine or threonine substituted for A65 do not perturb the formation of a solvent bridge between H64 and zinc-bound solvent. Thus, the evolution of residue 65 size is one factor affecting the trajectory of catalytic proton transfer.
PubMed: 8987974
DOI: 10.1021/bi9617872
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (2.2 Å)
Structure validation

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