Related Experiment Videos
Aspergillus fumigatus CYP51 sequence: potential basis for fluconazole resistance
T D Edlind1, K W Henry, K A Metera
1MCP Hahnemann University, Philadelphia, Pennsylvania 19129, USA. edlind@drexel.edu
Medical Mycology
|July 12, 2001
Summary
Aspergillus fumigatus is resistant to fluconazole due to its CYP51 gene. Comparing sequences with Candida albicans suggests a specific amino acid change, Ile301, may cause this azole antifungal resistance.
Area of Science:
- Medical Mycology
- Molecular Biology
- Drug Resistance
Background:
- Azole antifungal agents target cytochrome P450 sterol 14alpha-demethylase (CYP51).
- Aspergillus fumigatus exhibits intrinsic resistance to fluconazole, a widely used azole.
- Candida albicans provides a model for studying azole susceptibility and resistance mechanisms.
Purpose of the Study:
- To investigate the molecular basis of fluconazole resistance in Aspergillus fumigatus.
- To compare the CYP51 gene sequence of A. fumigatus with fluconazole-susceptible and resistant Candida albicans strains.
- To identify specific amino acid residues potentially responsible for azole resistance.
Main Methods:
- Cloning and sequencing of the Aspergillus fumigatus CYP51 gene.
- Bioinformatic analysis and comparison of CYP51 sequences between A. fumigatus and C. albicans.
- Hypothesis generation based on sequence homology and known resistance mutations.
Main Results:
- The CYP51 gene from A. fumigatus was successfully cloned and sequenced.
- Sequence comparison revealed a specific residue, Ile301 in A. fumigatus, corresponding to Thr315 in C. albicans.
- This residue is hypothesized to play a role in substrate binding and azole resistance.
Conclusions:
- The study provides a molecular hypothesis for fluconazole resistance in A. fumigatus.
- The identified Ile301 residue in A. fumigatus CYP51 is a potential key factor in its intrinsic azole resistance.
- Further studies are warranted to confirm the role of this residue in drug resistance mechanisms.