4W64

Hcp1 protein from Acinetobacter baumannii AB0057

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

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Literature

Crystal Structure of Hcp from Acinetobacter baumannii: A Component of the Type VI Secretion System.

Ruiz, F.M., Santillana, E., Spinola-Amilibia, M., Torreira, E., Culebras, E., Romero, A.

(2015) PLoS One 10: e0129691-e0129691

  • DOI: 10.1371/journal.pone.0129691
  • Primary Citation of Related Structures:  
    4W64

  • PubMed Abstract: 

    • The type VI secretion system (T6SS) is a bacterial macromolecular machine widely distributed in Gram-negative bacteria, which transports effector proteins into eukaryotic host cells or other bacteria. Membrane complexes and a central tubular structure, which resembles the tail of contractile bacteriophages, compose the T6SS ...

    The type VI secretion system (T6SS) is a bacterial macromolecular machine widely distributed in Gram-negative bacteria, which transports effector proteins into eukaryotic host cells or other bacteria. Membrane complexes and a central tubular structure, which resembles the tail of contractile bacteriophages, compose the T6SS. One of the proteins forming this tube is the hemolysin co-regulated protein (Hcp), which acts as virulence factor, as transporter of effectors and as a chaperone. In this study, we present the structure of Hcp from Acinetobacter baumannii, together with functional and oligomerization studies. The structure of this protein exhibits a tight β barrel formed by two β sheets and flanked at one side by a short α-helix. Six Hcp molecules associate to form a donut-shaped hexamer, as observed in both the crystal structure and solution. These results emphasize the importance of this oligomerization state in this family of proteins, despite the low similarity of sequence among them. The structure presented in this study is the first one for a protein forming part of a functional T6SS from A. baumannii. These results will help us to understand the mechanism and function of this secretion system in this opportunistic nosocomial pathogen.

    Organizational Affiliation: 

    Department of Chemical and Physical Biology, Centro de Investigaciones Biológicas-CSIC, Madrid, Spain.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Type VI secretion system effector, Hcp1 familyA, B, C171Acinetobacter baumannii AB0057Mutation(s): 0 
Gene Names: AB57_1481
UniProt
Find proteins for A0A0M3KKY9 (Acinetobacter baumannii (strain AB0057))
Explore A0A0M3KKY9 
Go to UniProtKB:  A0A0M3KKY9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0M3KKY9
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.001α = 90
b = 87.001β = 90
c = 128.809γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2014-08-20 
  • Released Date: 2015-07-01 
    • Deposition Author(s): Ruiz, F.M., Romero, A.

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release