2JV7 | pdb_00002jv7

NMR Solution Structure of Histoplasma capsulatum CBP Homodimer

• PDB DOI: https://doi.org/10.2210/pdb2JV7/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Histoplasma capsulatum
• Mutation(s): No 


• Deposited: 2007-09-12 Released: 2008-09-23 
• Deposition Author(s): Beck, M.R., DeKoster, G.T., Cistola, D.P., Goldman, W.E.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

NMR structure of a fungal virulence factor reveals structural homology with mammalian saposin B.

Beck, M.R., Dekoster, G.T., Cistola, D.P., Goldman, W.E.

(2009) Mol Microbiol 72: 344-353

• PubMed: 19298372 
• DOI: https://doi.org/10.1111/j.1365-2958.2009.06647.x
• Primary Citation Related Structures: 
  2JV7


• PubMed Abstract: 
  

  The fungal protein CBP (calcium binding protein) is a known virulence factor with an unknown virulence mechanism. The protein was identified based on its ability to bind calcium and its prevalence as Histoplasma capsulatum's most abundant secreted protein. However, CBP has no sequence homology with other CBPs and contains no known calcium binding motifs. Here, the NMR structure of CBP reveals a highly intertwined homodimer and represents the first atomic level NMR model of any fungal virulence factor. Each CBP monomer is comprised of four alpha-helices that adopt the saposin fold, characteristic of a protein family that binds to membranes and lipids. This structural homology suggests that CBP functions as a lipid binding protein, potentially interacting with host glycolipids in the phagolysosome of host cells.

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Organizational Affiliation: 
• Department of Molecular Microbiology, Washington University in St Louis, St Louis, MO, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 15.73 kDa 
• Atom Count: 1,094 
• Modeled Residue Count: 156 
• Deposited Residue Count: 156 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calcium-binding protein	A, B	78	Histoplasma capsulatum	Mutation(s): 0
UniProt
Find proteins for O42720 (Ajellomyces capsulatus (strain G186AR / H82 / ATCC MYA-2454 / RMSCC 2432)) Explore O42720  Go to UniProtKB:  O42720

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-09-23 
Deposition Author(s): Beck, M.R., DeKoster, G.T., Cistola, D.P., Goldman, W.E.

Revision History  

• Version 1.0: 2008-09-23
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2022-03-16
  Changes: Database references, Derived calculations
• Version 1.3: 2024-11-06
  Changes: Data collection, Structure summary