As a leading company in the field of biological research and drug discovery, Creative Biolabs has gained a wealth of good reputation for successfully completed numerous challenges in antifungal drug discovery. Based on our advanced technology platform and experienced scientists, we are able to provide a series of antifungal drug discovery services against various fungal diseases and related fungi. Here, we describe a pathogenic fungus - Hortaea werneckii that can cause tinea nigra in human.
Hortaea werneckii (H. werneckii) is an ascomycetous yeast causing a rare superficial and non-invasive skin infection tinea nigra. It is also known as Phaeoannellomyces werneckii and Exophiala werneckii previously. It is a dematiaceous and polymorphic fungus that can withstand and adapt to life in an environment with up to almost saturated NaCl solution, while also thriving in environments without NaCl. H. werneckii belongs to genus Hortaea, family Teratosphaeriaceae, order Capnodiales, class Dothideomycetes, and division Ascomycota.
The fungus belongs to the black yeast group and can be isolated from different marine habitats and soil samples because of its remarkable halotolerance. It mainly inhabits the soil, particularly being much more prevalent in warm, humid climates of the world such as the Central and South Americas, Africa, and Asia.
Fig.1 Micrograph of H. werneckii.
Mycology of H. werneckii
H. werneckii, identified as an extreme halotolerant fungus, can switch between two main life phases: yeast phase and hyphal phase.
Fig.2 Macroscopic and microscopic phenotypes of H. werneckii. (Chen, 2012)
Salt-tolerance Mechanisms of H. werneckii
It has been previously indicated that glycerol is the major compatible solute of H. werneckii. Others, including erythritol, arabitol, and mannitol, are also present in the exponentially growing cells at optimal growth salinities. When exposed to maximal salinities, only glycerol and erythritol are present in H. werneckii, and their decrease is correlated with the severity of hypoosmotic shock. Besides erythritol and glycerol, mycosporine-glutaminol-glucoside also might act as a complementary compatible solute of H. werneckii. Localization and content of melanin in H. werneckii cell-wall vary with the change of salt concentration. Melanized cell wall plays an important role in the effective retention of glycerol and typical symptom brownish black lesions of tinea nigra.
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