1ZNC

HUMAN CARBONIC ANHYDRASE IV

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of the secretory form of membrane-associated human carbonic anhydrase IV at 2.8-A resolution.

Stams, T., Nair, S.K., Okuyama, T., Waheed, A., Sly, W.S., Christianson, D.W.

(1996) Proc Natl Acad Sci U S A 93: 13589-13594

  • DOI: 10.1073/pnas.93.24.13589
  • Structures With Same Primary Citation

  • PubMed Abstract: 

    • It has recently been demonstrated that the C-terminal deletion mutant of recombinant human carbonic anhydrase IV (G267X CA IV) converts the normally glycosylphosphatidylinositol-anchored enzyme into a soluble secretory form which has the same catalyt ...

    It has recently been demonstrated that the C-terminal deletion mutant of recombinant human carbonic anhydrase IV (G267X CA IV) converts the normally glycosylphosphatidylinositol-anchored enzyme into a soluble secretory form which has the same catalytic properties as the membrane-associated enzyme purified from human tissues. We have determined the three-dimensional structure of the secretory form of human CA IV by x-ray crystallographic methods to a resolution of 2.8 A. Although the zinc binding site and the hydrophobic substrate binding pocket of CA IV are generally similar to those of other mammalian isozymes, unique structural differences are found elsewhere in the active site. Two disufide linkages, Cys-6-Cys-11G and Cys-23-Cys-203, stabilize the conformation of the N-terminal domain. The latter disulfide additionally stabilizes an active site loop containing a cis-peptide linkage between Pro-201 and Thr-202 (this loop contains catalytic residue Thr-199). On the opposite side of the active site, the Val-131-Asp-136 segment adopts an extended loop conformation instead of an alpha-helix conformation as found in other isozymes. Finally, the C terminus is surrounded by a substantial electropositive surface potential, which is likely to stabilize the interaction of CA IV with the negatively charged phospholipid headgroups of the membrane. These structural features are unique to CA IV and provide a framework for the design of sulfonamide inhibitors selective for this particular isozyme.

    Related Citations: 
    • Carbonic Anhydrase Iv: Purification of a Secretory Form of the Recombinant Human Enzyme and Identification of the Positions and Importance of its Disulfide Bonds
      Waheed, A., Okuyama, T., Heyduk, T., Sly, W.S.
      (1996) Arch Biochem Biophys 333: 432
    Organizational Affiliation: 

    Department of Chemistry, University of Pennsylvania, Philadelphia 19104-6323, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBONIC ANHYDRASE IV
A, B
266Homo sapiensMutation(s): 0 
Gene Names: HUMAN CAIV, CA4
EC: 4.2.1.1
Find proteins for P22748 (Homo sapiens)
Go to UniProtKB:  P22748
NIH Common Fund Data Resources
PHAROS  P22748
GTEx  ENSG00000167434
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
ZN
Query on ZN
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SO4Ki:  9000000   nM  BindingDB
SO4Ki:  44000000   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.5α = 90
b = 47.7β = 106.3
c = 141γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
ROTAVATA/AGROVATAdata reduction
X-PLORmodel building
X-PLORrefinement
CCP4data scaling
ROTAVATA)data scaling
X-PLORphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-09-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance