3SYS

Improved crystal structure of Pseudomonas aeruginosa OccK1 (OpdK)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Substrate Specificity within a Family of Outer Membrane Carboxylate Channels.

Eren, E.Vijayaraghavan, J.Liu, J.Cheneke, B.R.Touw, D.S.Lepore, B.W.Indic, M.Movileanu, L.van den Berg, B.

(2012) PLoS Biol 10: e1001242-e1001242

  • DOI: https://doi.org/10.1371/journal.pbio.1001242
  • Primary Citation of Related Structures:  
    3SY7, 3SY9, 3SYB, 3SYS, 3SZD, 3SZV, 3T0S, 3T20, 3T24

  • PubMed Abstract: 

    Many Gram-negative bacteria, including human pathogens such as Pseudomonas aeruginosa, do not have large-channel porins. This results in an outer membrane (OM) that is highly impermeable to small polar molecules, making the bacteria intrinsically resistant towards many antibiotics. In such microorganisms, the majority of small molecules are taken up by members of the OprD outer membrane protein family. Here we show that OprD channels require a carboxyl group in the substrate for efficient transport, and based on this we have renamed the family Occ, for outer membrane carboxylate channels. We further show that Occ channels can be divided into two subfamilies, based on their very different substrate specificities. Our results rationalize how certain bacteria can efficiently take up a variety of substrates under nutrient-poor conditions without compromising membrane permeability. In addition, they explain how channel inactivation in response to antibiotics can cause resistance but does not lead to decreased fitness.


  • Organizational Affiliation

    University of Massachusetts Medical School, Program in Molecular Medicine, Worcester, Massachusetts, United States of America.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Vanillate porin OpdK
A, B
398Pseudomonas aeruginosaMutation(s): 0 
Gene Names: opdKPA4898
Membrane Entity: Yes 
UniProt
Find proteins for Q9HUR5 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HUR5 
Go to UniProtKB:  Q9HUR5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HUR5
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
C8E
Query on C8E

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
CA [auth B]
D [auth A]
DA [auth B]
AA [auth B],
BA [auth B],
CA [auth B],
D [auth A],
DA [auth B],
E [auth A],
EA [auth B],
F [auth A],
FA [auth B],
G [auth A],
GA [auth B],
H [auth A],
HA [auth B],
I [auth A],
IA [auth B],
J [auth A],
JA [auth B],
K [auth A],
KA [auth B],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
VNL
Query on VNL

Download Ideal Coordinates CCD File 
LA [auth B],
MA [auth B],
R [auth A],
S [auth A]
4-HYDROXY-3-METHOXYBENZOATE
C8 H7 O4
WKOLLVMJNQIZCI-UHFFFAOYSA-M
EDO
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A],
T [auth B],
U [auth B],
V [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.142α = 90
b = 96.84β = 90
c = 121.557γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-08
    Type: Initial release
  • Version 1.1: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description