3B1B

The unique structure of wild type carbonic anhydrase alpha-CA1 from Chlamydomonas reinhardtii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The unique structure of carbonic anhydrase alpha CA1 from Chlamydomonas reinhardtii

Suzuki, K.Yang, S.Y.Shimizu, S.Morishita, E.C.Jiang, J.Zhang, F.Hoque, M.M.Sato, Y.Tsunoda, M.Sekiguchi, T.Takenaka, A.

(2011) Acta Crystallogr.,Sect.D 67: 894-901

  • DOI: 10.1107/S0907444911032884

  • PubMed Abstract: 
  • Chlamydomonas reinhardtii α-type carbonic anhydrase (Cr-αCA1) is a dimeric enzyme that catalyses the interconversion of carbon dioxide and carbonic acid. The precursor form of Cr-αCA1 undergoes post-translational cleavage and N-glycosylation. Compari ...

    Chlamydomonas reinhardtii α-type carbonic anhydrase (Cr-αCA1) is a dimeric enzyme that catalyses the interconversion of carbon dioxide and carbonic acid. The precursor form of Cr-αCA1 undergoes post-translational cleavage and N-glycosylation. Comparison of the genomic sequences of precursor Cr-αCA1 and other αCAs shows that Cr-αCA1 contains a different N-terminal sequence and two insertion sequences. A 35-residue peptide in one of the insertion sequences is deleted from the precursor during maturation. The crystal structure of the mature form of Cr-αCA1 has been determined at 1.88 Å resolution. Each subunit is cleaved into the long and short peptides, but they are linked together by a disulfide bond. The two subunits are linked by a disulfide bond. N-Glycosylations occur at three asparagine residues and the attached N-glycans protrude into solvent regions. The subunits consist of a core β-sheet structure composed of nine β-strands. At the centre of the β-sheet is the catalytic site, which contains a Zn atom bound to three histidine residues. The amino-acid residues around the Zn atom are highly conserved in other monomeric and dimeric αCAs. The short peptide runs near the active site and forms a hydrogen bond to the zinc-coordinated residue in the long chain, suggesting an important role for the short peptide in Cr-αCA1 activity.


    Organizational Affiliation

    College of Science and Engineering, Iwaki-Meisei University, Chuodai-iino, Iwaki, Fukushima 970-8551, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Carbonic anhydrase 1
A, B
377Chlamydomonas reinhardtiiGene Names: CAH1
EC: 4.2.1.1
Find proteins for P20507 (Chlamydomonas reinhardtii)
Go to UniProtKB:  P20507
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
SO4
Query on SO4

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Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
NAG
Query on NAG

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Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.187 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 134.300α = 90.00
b = 134.300β = 90.00
c = 120.100γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SHARPphasing
REFMACrefinement
HKL-2000data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-11-16
    Type: Initial release
  • Version 1.1: 2012-04-25
    Type: Database references