6E7E

High resolution crystal structure of IncA soluble domain

  • Classification: PROTEIN BINDING
  • Organism(s): Chlamydia trachomatis
  • Expression System: Escherichia coli
  • Mutation(s): Yes 

  • Deposited: 2018-07-26 Released: 2019-07-10 
  • Deposition Author(s): Cingolani, G., Paumet, F.
  • Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI), National Institutes of Health/Office of the Director, National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.12 Å
  • R-Value Free: 0.169 
  • R-Value Work: 0.141 
  • R-Value Observed: 0.142 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structural basis for the homotypic fusion of chlamydial inclusions by the SNARE-like protein IncA.

Cingolani, G., McCauley, M., Lobley, A., Bryer, A.J., Wesolowski, J., Greco, D.L., Lokareddy, R.K., Ronzone, E., Perilla, J.R., Paumet, F.

(2019) Nat Commun 10: 2747-2747

  • DOI: https://doi.org/10.1038/s41467-019-10806-9
  • Primary Citation of Related Structures:  
    6E6A, 6E7E

  • PubMed Abstract: 

    Many intracellular bacteria, including Chlamydia, establish a parasitic membrane-bound organelle inside the host cell that is essential for the bacteria's survival. Chlamydia trachomatis forms inclusions that are decorated with poorly characterized membrane proteins known as Incs. The prototypical Inc, called IncA, enhances Chlamydia pathogenicity by promoting the homotypic fusion of inclusions and shares structural and functional similarity to eukaryotic SNAREs. Here, we present the atomic structure of the cytoplasmic domain of IncA, which reveals a non-canonical four-helix bundle. Structure-based mutagenesis, molecular dynamics simulation, and functional cellular assays identify an intramolecular clamp that is essential for IncA-mediated homotypic membrane fusion during infection.

    • Organizational Affiliation: 

    Thomas Jefferson University, Department of Biochemistry and Molecular Biology, Philadelphia, PA, 19107, USA. gino.cingolani@jefferson.edu.


Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Inclusion membrane protein A169Chlamydia trachomatisMutation(s): 2 
Gene Names: incA
UniProt
Find proteins for P0CI27 (Chlamydia trachomatis serovar D (strain ATCC VR-885 / DSM 19411 / UW-3/Cx))
Explore P0CI27 
Go to UniProtKB:  P0CI27
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0CI27
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.12 Å
  • R-Value Free: 0.169 
  • R-Value Work: 0.141 
  • R-Value Observed: 0.142 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.323α = 90
b = 48.822β = 103.91
c = 41.738γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
AutoSolphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP30 CA56036
National Institutes of Health/Office of the DirectorUnited StatesS10 OD017987
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI073486
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI116983

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.2: 2024-03-13
    Changes: Data collection, Database references