Characterization of the FKBP12-Encoding Genes in Aspergillus fumigatus.

dc.contributor.author

Falloon, Katie

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Juvvadi, Praveen R

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Richards, Amber D

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Vargas-Muñiz, José M

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Renshaw, Hilary

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Steinbach, William J

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Goldman, Gustavo Henrique

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United States

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2015-12-03T14:07:12Z

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2015

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Invasive aspergillosis, largely caused by Aspergillus fumigatus, is responsible for a growing number of deaths among immunosuppressed patients. Immunosuppressants such as FK506 (tacrolimus) that target calcineurin have shown promise for antifungal drug development. FK506-binding proteins (FKBPs) form a complex with calcineurin in the presence of FK506 (FKBP12-FK506) and inhibit calcineurin activity. Research on FKBPs in fungi is limited, and none of the FKBPs have been previously characterized in A. fumigatus. We identified four orthologous genes of FKBP12, the human FK506 binding partner, in A. fumigatus and designated them fkbp12-1, fkbp12-2, fkbp12-3, and fkbp12-4. Deletional analysis of the four genes revealed that the Δfkbp12-1 strain was resistant to FK506, indicating FKBP12-1 as the key mediator of FK506-binding to calcineurin. The endogenously expressed FKBP12-1-EGFP fusion protein localized to the cytoplasm and nuclei under normal growth conditions but also to the hyphal septa following FK506 treatment, revealing its interaction with calcineurin. The FKBP12-1-EGFP fusion protein didn't localize at the septa in the presence of FK506 in the cnaA deletion background, confirming its interaction with calcineurin. Testing of all deletion strains in the Galleria mellonella model of aspergillosis suggested that these proteins don't play an important role in virulence. While the Δfkbp12-2 and Δfkbp12-3 strains didn't show any discernable phenotype, the Δfkbp12-4 strain displayed slight growth defect under normal growth conditions and inhibition of the caspofungin-mediated "paradoxical growth effect" at higher concentrations of the antifungal caspofungin. Together, these results indicate that while only FKBP12-1 is the bona fide binding partner of FK506, leading to the inhibition of calcineurin in A. fumigatus, FKBP12-4 may play a role in basal growth and the caspofungin-mediated paradoxical growth response. Exploitation of differences between A. fumigatus FKBP12-1 and human FKBP12 will be critical for the generation of fungal-specific FK506 analogs to inhibit fungal calcineurin and treat invasive fungal disease.

dc.identifier

http://www.ncbi.nlm.nih.gov/pubmed/26366742

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PONE-D-15-25783

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1932-6203

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https://hdl.handle.net/10161/10950

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eng

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Public Library of Science (PLoS)

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PLoS One

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10.1371/journal.pone.0137869

dc.subject

Animals

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Antifungal Agents

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Aspergillus fumigatus

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Calcineurin

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Cyclosporine

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Echinocandins

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Gene Deletion

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Humans

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Hyphae

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Lipopeptides

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Microbial Sensitivity Tests

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Moths

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Phylogeny

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Tacrolimus

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Tacrolimus Binding Protein 1A

dc.title

Characterization of the FKBP12-Encoding Genes in Aspergillus fumigatus.

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Journal article

pubs.author-url

http://www.ncbi.nlm.nih.gov/pubmed/26366742

pubs.begin-page

e0137869

pubs.issue

9

pubs.organisational-group

Basic Science Departments

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Clinical Science Departments

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Duke

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Molecular Genetics and Microbiology

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Pediatrics

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Pediatrics, Infectious Diseases

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School of Medicine

pubs.publication-status

Published online

pubs.volume

10

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