Structure of Giardia Carbamate Kinase

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.227 

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X-ray structure and characterization of carbamate kinase from the human parasite Giardia lamblia.

Galkin, A.Kulakova, L.Wu, R.Nash, T.E.Dunaway-Mariano, D.Herzberg, O.

(2010) Acta Crystallogr Sect F Struct Biol Cryst Commun 66: 386-390

  • DOI: https://doi.org/10.1107/S1744309110004665
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Carbamate kinase catalyzes the reversible conversion of carbamoyl phosphate and ADP to ATP and ammonium carbamate, which is hydrolyzed to ammonia and carbonate. The three-dimensional structure of carbamate kinase from the human parasite Giardia lamblia (glCK) has been determined at 3 A resolution. The crystals belonged to the monoclinic space group P2(1), with unit-cell parameters a = 69.77, b = 85.41, c = 102.1 A, beta = 106.8 degrees . The structure was refined to a final R factor of 0.227. The essentiality of glCK together with its absence in humans makes the enzyme an attractive candidate for anti-Giardia drug development. Steady-state kinetic rate constants have been determined. The k(cat) for ATP formation is 319 +/- 9 s(-1). The K(m) values for carbamoyl phosphate and ADP are 85 +/- 6 and 70 +/- 5 microM, respectively. The structure suggests that three invariant lysine residues (Lys131, Lys216 and Lys278) may be involved in the binding of substrates and phosphoryl transfer. The structure of glCK reveals that a glycerol molecule binds in the likely carbamoyl phosphate-binding site.

  • Organizational Affiliation

    W. M. Keck Laboratory for Structural Biology, Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, Rockville, Maryland, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carbamate kinase
A, B, C, D
317Giardia lamblia ATCC 50803Mutation(s): 0 
Gene Names: CKGL50803_16453
Find proteins for A8BB85 (Giardia intestinalis (strain ATCC 50803 / WB clone C6))
Explore A8BB85 
Go to UniProtKB:  A8BB85
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA8BB85
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.227 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.77α = 90
b = 85.41β = 106.8
c = 102.1γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-03-28
    Changes: Database references
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description