1JV0

THE CRYSTAL STRUCTURE OF THE ZINC(II) ADDUCT OF THE CAI MICHIGAN 1 VARIANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of a zinc-activated variant of human carbonic anhydrase I, CA I Michigan 1: evidence for a second zinc binding site involving arginine coordination

Ferraroni, M.Tilli, S.Briganti, F.Chegwidden, W.R.Supuran, C.T.Wiebauer, K.E.Tashian, R.E.Scozzafava, A.

(2002) Biochemistry 41: 6237-6244

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The human genetic variant carbonic anhydrase I (CA I) Michigan 1 results from a single point mutation that changes His 67 to Arg in a critical region of the active site. This variant of the zinc metalloenzyme appears to be unique in that it possesses ...

    The human genetic variant carbonic anhydrase I (CA I) Michigan 1 results from a single point mutation that changes His 67 to Arg in a critical region of the active site. This variant of the zinc metalloenzyme appears to be unique in that it possesses an esterase activity that is specifically enhanced by added free zinc ions. We have determined the three-dimensional structure of human CA I Michigan 1 by X-ray crystallography to a resolution of 2.6 A. In the absence of added zinc ions, the mutated residue, Arg 67, points out of the active site, hydrogen bonding with the carboxylate of Asn 69. This contrasts with the orientation of His 67, in the native isozyme, which points into the active site. The orientations of His 94, His 96, and His 119, that coordinate the catalytic zinc ion, and of the catalytically critical Thr 199-Glu 106 hydrogen bonding system, are largely unchanged in the mutant. The structure of an enzyme adduct with a second zinc bound was determined to a resolution of 2.0 A. The second zinc ion is coordinated to His 64, His 200, and Arg 67. This arginine residue reverses its orientation on zinc binding and turns into the active site. The residues at these three positions have been implicated in determining the specific kinetic properties of native CA I. This is, to our knowledge, the first example of a zinc ion coordinating with an arginine residue in a Zn(II) enzyme.


    Related Citations: 
    • New genetically determined molecular form of erythrocite esterase in man
      Shaw, C.R.,Syner, F.N.,Tashian, R.E.
      (1962) Science 138: 31
    • Point mutation in the variant of human carbonic anhydrase isozyme I (CAI MICHIGAN) active site decreases affinity for aromatic sulfonamide inhibitors
      Briganti, F.,Chegwidden, W.R.,Scozzafava, A.,Supuran, C.T.,Tashian, R.E.,Wiebauer, K.E.
      (1998) GENE FAM.LSOZYME BULL. 31: 43
    • Marked zinc activation of ester hydrolysis by a mutation, 67-HIS (CAT) To ARG (CGT), in the active site of human carbonic anhydrase I
      Chegwidden, W.R.,Wagner, L.E.,Venta, P.J.,Bergenhem, N.C.,Yu, Y.S.,Tashian, R.E.
      (1994) HUM.MUTAT. 4: 294


    Organizational Affiliation

    Dipartimento di Chimica, Laboratorio di Chimica Bioinorganica, Università degli Studi di Firenze, Via della Lastruccia, 5, I-50019 Sesto Fiorentino, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBONIC ANHYDRASE I
A, B
260Homo sapiensMutation(s): 1 
Gene Names: CA1
EC: 4.2.1.1
Find proteins for P00915 (Homo sapiens)
Go to Gene View: CA1
Go to UniProtKB:  P00915
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CLKi: 6000000 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 62.681α = 90.00
b = 71.356β = 90.00
c = 120.909γ = 90.00
Software Package:
Software NamePurpose
SAINTdata reduction
REFMACrefinement
SAINTdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-09-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance