1UIP

ADENOSINE DEAMINASE (HIS 238 GLU MUTANT)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Site-directed mutagenesis of histidine 238 in mouse adenosine deaminase: substitution of histidine 238 does not impede hydroxylate formation.

Sideraki, V.Wilson, D.K.Kurz, L.C.Quiocho, F.A.Rudolph, F.B.

(1996) Biochemistry 35: 15019-15028

  • DOI: 10.1021/bi961427e
  • Primary Citation of Related Structures:  
    1UIP, 1UIO

  • PubMed Abstract: 
  • His 238, a conserved amino acid located in hydrogen-bonding distance from C-6 of the substrate in the active site of murine adenosine deaminase (mADA) and postulated to play an important role in catalysis, was altered into an alanine, a glutamate, and an arginine using site-directed mutagenesis ...

    His 238, a conserved amino acid located in hydrogen-bonding distance from C-6 of the substrate in the active site of murine adenosine deaminase (mADA) and postulated to play an important role in catalysis, was altered into an alanine, a glutamate, and an arginine using site-directed mutagenesis. The Ala and Glu substitutions did not result in changes of the secondary or tertiary structure, while the Arg mutation caused local perturbations in tertiary structure and quenched the emission of one or more enzyme tryptophans. Neither the Glu or Arg mutations affected substrate binding affinity. By contrast, the Ala mutation enhanced substrate and inhibitor binding by 20-fold. The most inactive of the mutants, Glu 238, had a kcat/K(m) 4 x 10(-6) lower than the wild-type value, suggesting that a positive charge on His 238 is important for proper catalytic function. The Ala 238 mutant was the most active ADA, with a kcat/K(m) 2 x 10(-3) lower than the wild-type value. NMR spectroscopy and crystallography revealed that this mutant is able to catalyze hydration of purine riboside, a ground-state analog of the reaction. These results collectively show that His 238 is not required for formation of the hydroxylate used in the deamination and may instead have an important electrostatic role.


    Related Citations: 
    • Probing the Functional Role of Two Conserved Active Site Aspartates in Mouse Adenosine Deaminase
      Sideraki, V., Mohamedali, K.A., Wilson, D.K., Chang, Z., Kellems, R.E., Quiocho, F.A., Rudolph, F.B.
      (1996) Biochemistry 35: 7862
    • A Pre-Transition-State Mimic of an Enzyme: X-Ray Structure of Adenosine Deaminase with Bound 1-Deazaadenosine and Zinc-Activated Water
      Wilson, D.K., Quiocho, F.A.
      (1993) Biochemistry 32: 1689
    • Atomic Structure of Adenosine Deaminase Complexed with a Transition-State Analog: Understanding Catalysis and Immunodeficiency Mutations
      Wilson, D.K., Rudolph, F.B., Quiocho, F.A.
      (1991) Science 252: 1278

    Organizational Affiliation

    Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ADENOSINE DEAMINASE A349Mus musculusMutation(s): 1 
Gene Names: Ada
EC: 3.5.4.4
Find proteins for P03958 (Mus musculus)
Explore P03958 
Go to UniProtKB:  P03958
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PUR
Query on PUR

Download Ideal Coordinates CCD File 
A
PURINE RIBOSIDE
C10 H13 N4 O4
MRWXACSTFXYYMV-FDDDBJFASA-O
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.11α = 90
b = 93.81β = 126.83
c = 72.1γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
SDMSdata reduction
SDMSdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-06-24
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance