2CAB | pdb_00002cab

STRUCTURE, REFINEMENT AND FUNCTION OF CARBONIC ANHYDRASE ISOZYMES. REFINEMENT OF HUMAN CARBONIC ANHYDRASE I

• PDB DOI: https://doi.org/10.2210/pdb2CAB/pdb
• Entry: 2CAB supersedes: 1CAB

• Classification: HYDRO-LYASE
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 1983-10-05 Released: 1984-02-02 
• Deposition Author(s): Kannan, K.K., Ramanadham, M., Jones, T.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work: 
  0.193 (Depositor) 

Literature

Structure, refinement, and function of carbonic anhydrase isozymes: refinement of human carbonic anhydrase I

Kannan, K.K., Ramanadham, M., Jones, T.A.

(1984) Ann N Y Acad Sci 429: 49-60

• PubMed: 6430186 
• DOI: https://doi.org/10.1111/j.1749-6632.1984.tb12314.x
• Primary Citation of Related Structures:  
  2CAB


• PubMed Abstract: 
  

  The structure of human erythrocyte carbonic anhydrase I has been refined to a final R value of 19% to 2-A resolution by a combination of least squares refinement and model fitting in a three-dimensional graphics display. About 300 solvent atoms have been located bound to the protein molecule. An interesting hydrogen bond network involving Zn2+, the liganded solvent, side chain groups of Thr-199, Glu-106, Thr-7, and His-64 through two solvent molecules have been found that may be important for the catalytic mechanism of the carbonic anhydrase.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 28.85 kDa 
• Atom Count: 2,010 
• Modeled Residue Count: 256 
• Deposited Residue Count: 260 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CARBONIC ANHYDRASE FORM B	A	260	Homo sapiens	Mutation(s): 0  EC: 4.2.1.1 (PDB Primary Data), 4.2.1.69 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P00915 (Homo sapiens) Explore P00915  Go to UniProtKB:  P00915
PHAROS:  P00915 GTEx:  ENSG00000133742

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	B [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work:  0.193 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.5	α = 90
b = 73.6	β = 90
c = 37.1	γ = 90

Software Package:

Software Name	Purpose
CORELS	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1984-02-02 
Deposition Author(s): Kannan, K.K., Ramanadham, M., Jones, T.A.
• This entry supersedes: 1CAB

Revision History  

• Version 1.0: 1984-02-02
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other
• Version 1.4: 2024-02-14
  Changes: Data collection, Database references, Derived calculations