Structure determination of CAMP factor of Mobiluncus curtisii and insight into structural dynamics

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

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Structure determination of CAMP factor of Mobiluncus curtisii and insights into structural dynamics.

Zeng, W.Ma, H.Fan, W.Yang, Y.Zhang, C.Arnaud Kombe Kombe, J.Fan, X.Zhang, Y.Dong, Z.Shen, Z.Zhou, Y.Yang, M.Jin, T.

(2020) Int J Biol Macromol 150: 1027-1036

  • DOI: https://doi.org/10.1016/j.ijbiomac.2019.10.107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacterial vaginosis (BV) is a common type of vaginal inflammation caused by a proliferation of pathogenic bacteria, among which Mobiluncus curtisii. In our previous studies on M. curtisii genome, we identified the presence of a genomic fragment encoding a 25 kDa pore-forming toxin, the CAMP factor, which is known to be involved in the synergistic lysis of erythrocytes namely CAMP reaction. However, whether this hypothetical gene product has hemolytic activity is unknown. Moreover, its relative structure and function are not yet solved. Here we found that the M. curtisii CAMP factor is a monomer at pH 4.4 and oligomer at pH > 4.6. Hemolysis assays showed that M. curtisii CAMP factor could lyse sheep red blood cells efficiently in pH 5.4-7.4. Negative staining electron microscope analysis of the CAMP factor revealed ring-like structures at pH above 4.6. Additionally, the crystal structure of M. curtisii CAMP factor, determineded at 1.85 Å resolution, reveals a 5 + 3 helix motif. Further functional analysis suggested that the structural rearrangement of the N-terminal domain might be required for protein function. In conclusion, this structure-function relationship study of CAMP factor provides a new perspective of the M. curtisii role in BV development.

  • Organizational Affiliation

    The Biomedical Translational Research Institute, Faculty of Medical Science, Jinan University, Guangzhou, Guangdong 510632, China; Zhuhai Precision Medical Center, Zhuhai People's Hospital (Zhuhai Hospital Affiliated with Jinan University), Jinan University, Zhuhai, Guangdong 519000, China; Hefei National Laboratory for Physical Sciences at Microscale, Laboratory of Structural Immunology, CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CAMP factor231Mobiluncus curtisii ATCC 43063Mutation(s): 0 
Gene Names: HMPREF0573_10472
Find proteins for D6ZJ92 (Mobiluncus curtisii (strain ATCC 43063 / DSM 2711 / V125))
Explore D6ZJ92 
Go to UniProtKB:  D6ZJ92
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD6ZJ92
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ACT

Download Ideal Coordinates CCD File 
C2 H3 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.67α = 90
b = 75.67β = 90
c = 192.1γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2020-04-08
    Changes: Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description