5D8D

Crystal structure of D-alanine-D-alanine ligase from Acinetobacter baumannii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.224 

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This is version 1.1 of the entry. See complete history


Literature

The crystal structure of the D-alanine-D-alanine ligase from Acinetobacter baumannii suggests a flexible conformational change in the central domain before nucleotide binding

Huynh, K.H.Hong, M.K.Lee, C.Tran, H.T.Lee, S.H.Ahn, Y.J.Cha, S.S.Kang, L.W.

(2015) J Microbiol 53: 776-782

  • DOI: https://doi.org/10.1007/s12275-015-5475-8
  • Primary Citation of Related Structures:  
    5D8D, 5DMX

  • PubMed Abstract: 

    Acinetobacter baumannii, which is emerging as a multidrug-resistant nosocomial pathogen, causes a number of diseases, including pneumonia, bacteremia, meningitis, and skin infections. With ATP hydrolysis, the D-alanine-D-alanine ligase (DDL) catalyzes the synthesis of D-alanyl-D-alanine, which is an essential component of bacterial peptidoglycan. In this study, we determined the crystal structure of DDL from A. baumannii (AbDDL) at a resolution of 2.2 Å. The asymmetric unit contained six protomers of AbDDL. Five protomers had a closed conformation in the central domain, while one protomer had an open conformation in the central domain. The central domain with an open conformation did not interact with crystallographic symmetry-related protomers and the conformational change of the central domain was not due to crystal packing. The central domain of AbDDL can have an ensemble of the open and closed conformations before the binding of substrate ATP. The conformational change of the central domain is important for the catalytic activity and the detail information will be useful for the development of inhibitors against AbDDL and putative antibacterial agents against A. baumannii. The AbDDL structure was compared with that of other DDLs that were in complex with potent inhibitors and the catalytic activity of AbDDL was confirmed using enzyme kinetics assays.


  • Organizational Affiliation

    Department of Biological Sciences, Konkuk University, Seoul, 143-701, Republic of Korea.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
D-alanine--D-alanine ligase
A, B, C, D, E
A, B, C, D, E, F
308Acinetobacter baumannii ACICUMutation(s): 0 
Gene Names: ddlACICU_03532
EC: 6.3.2.4
UniProt
Find proteins for B2I1J3 (Acinetobacter baumannii (strain ACICU))
Explore B2I1J3 
Go to UniProtKB:  B2I1J3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2I1J3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.224 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 221.618α = 90
b = 74.766β = 103.27
c = 143.117γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
HKL-2000phasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-17
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Data collection, Database references, Derived calculations