1J1Y

Crystal Structure of PaaI from Thermus thermophilus HB8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Novel Induced-fit Reaction Mechanism of Asymmetric Hot Dog Thioesterase PaaI

Kunishima, N.Asada, Y.Sugahara, M.Ishijima, J.Nodake, Y.Sugahara, M.Miyano, M.Kuramitsu, S.Yokoyama, S.Sugahara, M.

(2005) J.Mol.Biol. 352: 212-228

  • DOI: 10.1016/j.jmb.2005.07.008
  • Primary Citation of Related Structures:  1WLU, 1WLV, 1WM6, 1WN3

  • PubMed Abstract: 
  • Hot dog fold proteins sharing the characteristic "hot dog" fold are known to involve certain coenzyme A binding enzymes with various oligomeric states. In order to elucidate the oligomerization-function relationship of the hot dog fold proteins, crys ...

    Hot dog fold proteins sharing the characteristic "hot dog" fold are known to involve certain coenzyme A binding enzymes with various oligomeric states. In order to elucidate the oligomerization-function relationship of the hot dog fold proteins, crystal structures of the phenylacetate degradation protein PaaI from Thermus thermophilus HB8 (TtPaaI), a tetrameric acyl-CoA thioesterase with the hot dog fold, have been determined and compared with those of other family members. In the liganded crystal forms with coenzyme A derivatives, only two of four intersubunit catalytic pockets of the TtPaaI tetramer are occupied by the ligands. A detailed structural comparison between several liganded and unliganded forms reveals that a subtle rigid-body rearrangement of subunits within 2 degrees upon binding of the first two ligand molecules can induce a strict negative cooperativity to prevent further binding at the remaining two pockets, indicating that the so-called "half-of-the-sites reactivity" of oligomeric enzymes is visualized for the first time. Considering kinetic and mutational analyses together, a possible reaction mechanism of TtPaaI is proposed; one tetramer binds only two acyl-CoA molecules with a novel asymmetric induced-fit mechanism and carries out the hydrolysis according to a base-catalyzed reaction through activation of a water molecule by Asp48. From a structural comparison with other family members, it is concluded that a subgroup of the hot dog fold protein family, referred to as "asymmetric hot dog thioesterases" including medium chain acyl-CoA thioesterase II from Escherichia coli and human thioesterase III, might share the same oligomerization mode and the asymmetric induced-fit mechanism as observed in TtPaaI.


    Organizational Affiliation

    Highthroughput Factory, RIKEN Harima Institute at SPring-8, 1-1-1 Kouto, Sayo-gun, Hyogo 679-5148, Japan. kunisima@spring8.or.jp




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PaaI protein
A, B
136Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)N/A
Find proteins for Q5SJP3 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SJP3
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.181 
  • Space Group: P 43 2 2
Unit Cell:
Length (Å)Angle (°)
a = 57.877α = 90.00
b = 57.877β = 90.00
c = 139.607γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
MLPHAREphasing
CNSrefinement
CCP4data scaling
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-02-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Source and taxonomy, Version format compliance