4PJ2

Crystal structure of Aeromonas hydrophila PliI in complex with Meretrix lusoria lysozyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.24 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.148 

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This is version 1.2 of the entry. See complete history


Literature

The structure of the proteinaceous inhibitor PliI from Aeromonas hydrophila in complex with its target lysozyme.

Leysen, S.Van Herreweghe, J.M.Yoneda, K.Ogata, M.Usui, T.Araki, T.Michiels, C.W.Strelkov, S.V.

(2015) Acta Crystallogr D Biol Crystallogr 71: 344-351

  • DOI: https://doi.org/10.1107/S1399004714025863
  • Primary Citation of Related Structures:  
    4PJ2

  • PubMed Abstract: 

    Recent microbiological data have revealed that Gram-negative bacteria are able to protect themselves against the lytic action of host lysozymes by secreting proteinaceous inhibitors. Four distinct classes of such inhibitors have been discovered that specifically act against c-type, g-type and i-type lysozymes. Here, the 1.24 Å resolution crystal structure of the periplasmic i-type lysozyme inhibitor from Aeromonas hydrophila (PliI-Ah) in complex with the i-type lysozyme from Meretrix lusoria is reported. The structure is the first to explain the inhibitory mechanism of the PliI family at the atomic level. A distinct `ridge' formed by three exposed PliI loops inserts into the substrate-binding groove of the lysozyme, resulting in a complementary `key-lock' interface. The interface is principally stabilized by the interactions made by the PliI-Ah residues Ser104 and Tyr107 belonging to the conserved SGxY motif, as well as by the other conserved residues Ser46 and Asp76. The functional importance of these residues is confirmed by inhibition assays with the corresponding point mutants of PliI-Ah. The accumulated structural data on lysozyme-inhibitor complexes from several classes indicate that in all cases an extensive interface of either a single or a double `key-lock' type is formed, resulting in highly efficient inhibition. These data provide a basis for the rational development of a new class of antibacterial drugs.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Fukushima National College of Technology, 30 Nagao, Kamiarakawa, Taira, Iwaki, Fukushima 970-8034, Japan.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative exported protein
A, B
135Aeromonas hydrophila subsp. hydrophila ATCC 7966Mutation(s): 0 
Gene Names: AHA_1205
UniProt
Find proteins for A0KHJ5 (Aeromonas hydrophila subsp. hydrophila (strain ATCC 7966 / DSM 30187 / BCRC 13018 / CCUG 14551 / JCM 1027 / KCTC 2358 / NCIMB 9240 / NCTC 8049))
Explore A0KHJ5 
Go to UniProtKB:  A0KHJ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0KHJ5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Lysozyme
C, D
122Meretrix lusoriaMutation(s): 0 
EC: 3.2.1.17
UniProt
Find proteins for P86383 (Meretrix lusoria)
Explore P86383 
Go to UniProtKB:  P86383
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP86383
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.24 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.148 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.933α = 90
b = 77.667β = 108.12
c = 69.38γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-02-25
    Changes: Database references
  • Version 1.2: 2023-12-27
    Changes: Data collection, Database references, Derived calculations, Source and taxonomy