5B4D

Crystal structure of H10N mutant of LpxH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Crystal structures of the UDP-diacylglucosamine pyrophosphohydrase LpxH from Pseudomonas aeruginosa

Okada, C.Wakabayashi, H.Kobayashi, M.Shinoda, A.Tanaka, I.Yao, M.

(2016) Sci Rep 6: 32822-32822

  • DOI: https://doi.org/10.1038/srep32822
  • Primary Citation of Related Structures:  
    5B49, 5B4A, 5B4B, 5B4C, 5B4D

  • PubMed Abstract: 

    Lipid A (also known as endotoxin) is the hydrophobic portion of lipopolysaccharides. It is an essential membrane component required for the viability of gram-negative bacteria. The enzymes involved in its biosynthesis are attractive targets for the development of novel antibiotics. LpxH catalyzes the fourth step of the lipid A biosynthesis pathway and cleaves the pyrophosphate bond of UDP-2,3-diacylglucosamine to yield 2,3-diacylglucosamine 1-phosphate (lipid X) and UMP. Here we present the structures of LpxH from Pseudomonas aeruginosa (PaLpxH). PaLpxH consists of two domains: a catalytic domain that is homologous to the metallophosphoesterases and a helical insertion domain. Lipid X was captured in the crevice between these two domains, with its phosphate group facing the dinuclear metal (Mn(2+)) center and two acyl chains buried in the hydrophobic cavity. The structures reveal that a large conformational change occurs at the lipid X binding site surface upon the binding/release of the product molecule. Based on these observations, we propose a novel model for lipid X embedding, which involves the scissor-like movement of helix α6, resulting in the release of lipid X into the lipid bilayer.


  • Organizational Affiliation

    Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UDP-2,3-diacylglucosamine hydrolase
A, B
248Pseudomonas aeruginosa PAO1Mutation(s): 1 
Gene Names: lpxHPA1792
EC: 3.6.1.54
Membrane Entity: Yes 
UniProt
Find proteins for Q9I2V0 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I2V0 
Go to UniProtKB:  Q9I2V0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I2V0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.564α = 90
b = 87.888β = 90
c = 98.358γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-28
    Type: Initial release
  • Version 1.1: 2020-02-26
    Changes: Data collection, Derived calculations
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Refinement description