6TZ7

Crystal Structure of Aspergillus fumigatus Calcineurin A, Calcineurin B, FKBP12 and FK506 (Tacrolimus)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.201 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Harnessing calcineurin-FK506-FKBP12 crystal structures from invasive fungal pathogens to develop antifungal agents.

Juvvadi, P.R.Fox 3rd, D.Bobay, B.G.Hoy, M.J.Gobeil, S.M.C.Venters, R.A.Chang, Z.Lin, J.J.Averette, A.F.Cole, D.C.Barrington, B.C.Wheaton, J.D.Ciofani, M.Trzoss, M.Li, X.Lee, S.C.Chen, Y.L.Mutz, M.Spicer, L.D.Schumacher, M.A.Heitman, J.Steinbach, W.J.

(2019) Nat Commun 10: 4275-4275

  • DOI: https://doi.org/10.1038/s41467-019-12199-1
  • Primary Citation of Related Structures:  
    5B8I, 6TZ6, 6TZ7, 6TZ8

  • PubMed Abstract: 

    Calcineurin is important for fungal virulence and a potential antifungal target, but compounds targeting calcineurin, such as FK506, are immunosuppressive. Here we report the crystal structures of calcineurin catalytic (CnA) and regulatory (CnB) subunits complexed with FK506 and the FK506-binding protein (FKBP12) from human fungal pathogens (Aspergillus fumigatus, Candida albicans, Cryptococcus neoformans and Coccidioides immitis). Fungal calcineurin complexes are similar to the mammalian complex, but comparison of fungal and human FKBP12 (hFKBP12) reveals conformational differences in the 40s and 80s loops. NMR analysis, molecular dynamic simulations, and mutations of the A. fumigatus CnA/CnB-FK506-FKBP12-complex identify a Phe88 residue, not conserved in hFKBP12, as critical for binding and inhibition of fungal calcineurin. These differences enable us to develop a less immunosuppressive FK506 analog, APX879, with an acetohydrazine substitution of the C22-carbonyl of FK506. APX879 exhibits reduced immunosuppressive activity and retains broad-spectrum antifungal activity and efficacy in a murine model of invasive fungal infection.


  • Organizational Affiliation

    Division of Pediatric Infectious Diseases, Department of Pediatrics, Duke University Medical Center, Durham, NC, 27710, USA. praveen.juvvadi@duke.edu.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2B catalytic subunit388Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: cnaAAFUA_5G09360
EC: 3.1.3.16
UniProt
Find proteins for Q4WUR1 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q4WUR1 
Go to UniProtKB:  Q4WUR1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4WUR1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Calcineurin Ca2+-binding regulatory subunit CnaB174Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: AFUA_6G04540
UniProt
Find proteins for Q4WDF2 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q4WDF2 
Go to UniProtKB:  Q4WDF2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4WDF2
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
FK506-binding protein 1A127Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: fpr1AAFUA_6G12170
EC: 5.2.1.8
UniProt
Find proteins for Q4WLV6 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q4WLV6 
Go to UniProtKB:  Q4WLV6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4WLV6
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FK5 (Subject of Investigation/LOI)
Query on FK5

Download Ideal Coordinates CCD File 
L [auth C]8-DEETHYL-8-[BUT-3-ENYL]-ASCOMYCIN
C44 H69 N O12
QJJXYPPXXYFBGM-LFZNUXCKSA-N
PO4
Query on PO4

Download Ideal Coordinates CCD File 
F [auth A]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
ZN
Query on ZN

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D [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
EDO
Query on EDO

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G [auth A],
H [auth A]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
FE
Query on FE

Download Ideal Coordinates CCD File 
E [auth A]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
I [auth B],
J [auth B],
K [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.24α = 90
b = 94.46β = 109.28
c = 69.83γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-10-02
    Changes: Data collection, Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Derived calculations, Refinement description