1KRB

CRYSTAL STRUCTURE OF KLEBSIELLA AEROGENES UREASE, ITS APOENZYME AND TWO ACTIVE SITE MUTANTS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of the Klebsiella aerogenes urease apoenzyme and two active-site mutants.

Jabri, E.Karplus, P.A.

(1996) Biochemistry 35: 10616-10626

  • DOI: 10.1021/bi960424z
  • Primary Citation of Related Structures:  1KRA, 1KRC

  • PubMed Abstract: 
  • Urease from Klebsiella aerogenes [Jabri et al. (1995) Science 268, 998-1004] is an (alpha beta gamma)3 trimer with each alpha-subunit having an (alpha beta)8-barrel domain containing a binickel active center. Here we examine structure-function relati ...

    Urease from Klebsiella aerogenes [Jabri et al. (1995) Science 268, 998-1004] is an (alpha beta gamma)3 trimer with each alpha-subunit having an (alpha beta)8-barrel domain containing a binickel active center. Here we examine structure-function relations for urease in more detail through structural analysis of the urease apoenzyme at 2.3 A resolution and mutants of two key catalytic residues (H219A and H320A) at 2.5 A resolution. With the exception of the active site, in which a water molecule takes the place of the missing carbamate and nickel atoms, the structure of the apoenzyme is nearly identical to that of the holoenzyme, suggesting a high degree of preorganization which helps explain the tight binding of nickel. In the structure of H219A, the major change involves a conformational shift and ordering of the active site flap, but a small shift in the side chain of Asp alpha 221 could contribute to the lower activity of H219A. In the H320A structure, the catalytic water, primarily a Ni-2 ligand in the holoenzyme, shifts into a bridging position. This shift shows that the nickel ligation is rather sensitive to the environment and the change in ligation may contribute to the 10(5)-fold lower activity of H320A. In addition, these results show that urease is resilient to the loss of nickel ions and mutations. Analysis of the urease tertiary/quaternary structure suggests that the stability of this enzyme may be largely due to its burial of an unusually large fraction of its residues: 50% in the gamma-subunit, 30% in the beta-subunit, and 60% in the alpha-subunit.


    Related Citations: 
    • The Crystal Structure of Urease from Klebsiella Aerogenes
      Jabri, E.,Carr, M.B.,Hausinger, R.P.,Karplus, P.A.
      (1995) Science 268: 998
    • Site-Directed Mutagenesis of Klebsiella Aerogenes Urease: Identification of Histidine Residues that Appear to Function in Nickel Ligation, Substrate Binding, and Catalysis
      Park, I.-L.,Hausinger, R.P.
      (1993) Protein Sci. 2: 1034
    • Preliminary Crystallographic Studies of Urease from Jack Bean and from Klebsiella Aerogenes
      Jabri, E.,Lee, M.H.,Hausinger, R.P.,Karplus, P.A.
      (1992) J.Mol.Biol. 227: 934


    Organizational Affiliation

    Section of Biochemistry, Molecular and Cell Biology, Cornell University, Ithaca, New York 14853, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UREASE
A
100Enterobacter aerogenesGene Names: ureA
EC: 3.5.1.5
Find proteins for P18316 (Enterobacter aerogenes)
Go to UniProtKB:  P18316
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
UREASE
B
106Enterobacter aerogenesGene Names: ureB
EC: 3.5.1.5
Find proteins for P18315 (Enterobacter aerogenes)
Go to UniProtKB:  P18315
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
UREASE
C
567Enterobacter aerogenesGene Names: ureC
EC: 3.5.1.5
Find proteins for P18314 (Enterobacter aerogenes)
Go to UniProtKB:  P18314
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NI
Query on NI

Download SDF File 
Download CCD File 
C
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
KCX
Query on KCX
C
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Work: 0.179 
  • Space Group: I 21 3
Unit Cell:
Length (Å)Angle (°)
a = 170.800α = 90.00
b = 170.800β = 90.00
c = 170.800γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
X-PLORmodel building
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-10-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance