4EYQ

Crystal structure of solute binding protein of ABC transporter from Rhodopseudomonas palustris HaA2 in complex with caffeic acid/3-(4-HYDROXY-PHENYL)PYRUVIC ACID


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.154 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structural and functional characterization of solute binding proteins for aromatic compounds derived from lignin: p-Coumaric acid and related aromatic acids.

Tan, K.Chang, C.Cuff, M.Osipiuk, J.Landorf, E.Mack, J.C.Zerbs, S.Joachimiak, A.Collart, F.R.

(2013) Proteins 81: 1709-1726

  • DOI: 10.1002/prot.24305
  • Primary Citation of Related Structures:  3RPW, 3SG0, 3TX6, 3UK0, 3UKJ, 4DQD, 4EYO, 4F8J, 4FB4, 4I1D

  • PubMed Abstract: 
  • Lignin comprises 15-25% of plant biomass and represents a major environmental carbon source for utilization by soil microorganisms. Access to this energy resource requires the action of fungal and bacterial enzymes to break down the lignin polymer in ...

    Lignin comprises 15-25% of plant biomass and represents a major environmental carbon source for utilization by soil microorganisms. Access to this energy resource requires the action of fungal and bacterial enzymes to break down the lignin polymer into a complex assortment of aromatic compounds that can be transported into the cells. To improve our understanding of the utilization of lignin by microorganisms, we characterized the molecular properties of solute binding proteins of ATP-binding cassette transporter proteins that interact with these compounds. A combination of functional screens and structural studies characterized the binding specificity of the solute binding proteins for aromatic compounds derived from lignin such as p-coumarate, 3-phenylpropionic acid and compounds with more complex ring substitutions. A ligand screen based on thermal stabilization identified several binding protein clusters that exhibit preferences based on the size or number of aromatic ring substituents. Multiple X-ray crystal structures of protein-ligand complexes for these clusters identified the molecular basis of the binding specificity for the lignin-derived aromatic compounds. The screens and structural data provide new functional assignments for these solute-binding proteins which can be used to infer their transport specificity. This knowledge of the functional roles and molecular binding specificity of these proteins will support the identification of the specific enzymes and regulatory proteins of peripheral pathways that funnel these compounds to central metabolic pathways and will improve the predictive power of sequence-based functional annotation methods for this family of proteins.


    Organizational Affiliation

    Biosciences Division, Argonne National Laboratory, Lemont, Illinois, 60439; The Midwest Center for Structural Genomics, Argonne National Laboratory, Lemont, Illinois, 60439; Structural Biology Center, Argonne National Laboratory, Lemont, Illinois, 60439.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Extracellular ligand-binding receptor
A
362Rhodopseudomonas palustris (strain HaA2)N/A
Find proteins for Q2IU40 (Rhodopseudomonas palustris (strain HaA2))
Go to UniProtKB:  Q2IU40
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DHC
Query on DHC

Download SDF File 
Download CCD File 
A
CAFFEIC ACID
3,4-DIHYDROXYCINNAMIC ACID
C9 H8 O4
QAIPRVGONGVQAS-DUXPYHPUSA-N
 Ligand Interaction
ENO
Query on ENO

Download SDF File 
Download CCD File 
A
3-(4-HYDROXY-PHENYL)PYRUVIC ACID
HPP
C9 H8 O4
KKADPXVIOXHVKN-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 88.338α = 90.00
b = 88.338β = 90.00
c = 209.920γ = 120.00
Software Package:
Software NamePurpose
DMphasing
PDB_EXTRACTdata extraction
ARP/wARPmodel building
SBC-Collectdata collection
HKL-3000data reduction
HKL-3000data scaling
MLPHAREphasing
SHELXDEphasing
REFMACrefinement
RESOLVEphasing
HKL-3000phasing
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-30
    Type: Initial release
  • Version 1.1: 2013-05-15
    Type: Database references
  • Version 1.2: 2013-07-24
    Type: Database references
  • Version 1.3: 2013-08-07
    Type: Database references
  • Version 1.4: 2013-09-25
    Type: Database references