Proteome and secretome of the extremotolerant rock black fungus Knufia chersonesos and its nonmelanized spontaneous mutant were analyzed following the fungus growth under LSSMG in rotating bioreactors (High Aspect Ratio Vessels; HARV). Tandem Mass Tags (TMS)-based quantitative shotgun proteomics was applied to compare gravity to microgravity conditions as well as to elucidate differences in the response between wild type and mutant strain.