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

Journal Article · · Nature Communications
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  1. Duke Univ., Durham, NC (United States). Medical Center; DOE/OSTI
  2. Beryllium Discovery Corporation, Bainbridge Island, WA (United States); UCB Pharma., Bainbridge Island, WA (United States); Seattle Structural Genomics Center for Infectious Disease (SSGCID), Seattle, WA (United States)
  3. Duke Univ., Durham, NC (United States). Medical Center
  4. Duke Univ., Durham, NC (United States)
  5. Amplyx Pharmaceuticals, San Diego, CA (United States)
  6. Amplyx Pharmaceuticals, San Diego, CA (United States); Forge Therapeutics, Inc., San Diego, CA (United States)
  7. Univ. of Texas at San Antonio, TX (United States)
  8. National Taiwan Univ., Taipei (Taiwan)
  9. Amplyx Pharmaceuticals, San Diego, CA (United States); Genentech, San Francisco, CA (United States)

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH); Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea; Michigan Economic Development Corporation; Michigan Technology Tri-Corridor; Canada Foundation for Innovation; Natural Sciences and Engineering Research Council of Canada; University of Saskatchewan; Government of Saskatchewan; Western Economic Diversification Canada; National Research Council Canada; Canadian Institutes of Health Research
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1573396
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (16)

Functional Coupling between the Unfolded Protein Response and Endoplasmic Reticulum/Golgi Ca 2+ -ATPases Promotes Stress Tolerance, Cell Wall Biosynthesis, and Virulence of Aspergillus fumigatus journal June 2020
Stable and destabilized GFP reporters to monitor calcineurin activity in Saccharomyces cerevisiae journal April 2020
Calcineurin Regulates Conidiation, Chlamydospore Formation and Virulence in Fusarium oxysporum f. sp. lycopersici journal October 2020
Additional file 10 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 dataset January 2021
Additional file 11 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 12 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 13 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 1 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 2 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 3 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 4 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 dataset January 2021
Additional file 5 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 dataset January 2021
Additional file 6 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 dataset January 2021
Additional file 7 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 dataset January 2021
Additional file 8 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 image January 2021
Additional file 9 of High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12 dataset January 2021

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