Transcriptional coregulator that functions together with transcription factor HSF1 (PubMed:17040492). Positively regulates the expression of laccase LAC1 during glucose starvation (PubMed:17040492). Interacts with transcription factor HSF1 on chromatin. Abolishes LAC1 expression and activity during glucose starvation (PubMed:17040492). Abolishes laccase activity during calcium stress and iron stress (PubMed:17040492). Severely decreases laccase activity during copper stress (PubMed:17040492). Melanin absent from cell (PubMed:25972480). Decreases virulence in a mouse intravenous inoculation model of infection (PubMed:17040492). Belongs to the heat shock protein 70 family.