1UIO

ADENOSINE DEAMINASE (HIS 238 ALA MUTANT)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 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:  

  • 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, an ...

    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: 
    • 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ADENOSINE DEAMINASE
A
349Mus musculusMutation(s): 1 
Gene Names: Ada
EC: 3.5.4.4
Find proteins for P03958 (Mus musculus)
Go to UniProtKB:  P03958
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
HPR
Query on HPR

Download SDF File 
Download CCD File 
A
6-HYDROXY-7,8-DIHYDRO PURINE NUCLEOSIDE
C10 H14 N4 O5
ZWTNXGIZBOQCAJ-KQYNXXCUSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
HPRKi: 45000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.203 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 99.140α = 90.00
b = 93.940β = 126.92
c = 71.980γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORmodel building
SDMSdata scaling
SDMSdata reduction
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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