1J9W

Solution Structure of the CAI Michigan 1 Variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.5 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

  • DOI: 10.1021/bi0120446
  • Primary Citation of Related Structures:  
    1J9W, 1JV0

  • 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 an esterase activity that is specifically enhanced by added free zinc ions ...

    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 erythrocyte esterase in man.
      SHAW, C.R., SYNER, F.N., TASHIAN, R.E.
      (1962) Science 138: 31
    • 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
    • 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

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CARBONIC ANHYDRASE IA, B260Homo sapiensMutation(s): 1 
Gene Names: CA1
EC: 4.2.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P00915 (Homo sapiens)
Explore P00915 
Go to UniProtKB:  P00915
PHAROS:  P00915
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A], E [auth B]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
D [auth A], F [auth B]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.875α = 90
b = 71.732β = 90
c = 120.392γ = 90
Software Package:
Software NamePurpose
SAINTdata scaling
SAINTdata reduction
AMoREphasing
REFMACrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-03-26
    Changes: Database references
  • Version 1.4: 2017-02-01
    Changes: Structure summary
  • Version 1.5: 2018-04-04
    Changes: Data collection