Component of the RYP2-RYP3 heterodimeric complex that plays a dual role in activating genes associated with spore maturation and repressing certain development-associated genes (By similarity). The complex binds DNA through the DNA-binding domain of vosA that recognizes an 11-nucleotide consensus sequence 5'-CTGGCCGCGGC-3' consisting of two motifs in the promoters of key developmental regulatory genes (By similarity). Required for viable spore production and regulation of sporulation in response to temperature and for the switch to yeast-form in the presence of host cells (PubMed:18791067). Forms a heterodimeric complex with RYP3; the formation of the RYP2-RYP3 complex is light-dependent (By similarity). Expression is increased at higher temperature (37 degrees Celsius) and regulated by the transcription factor RYP1 (PubMed:18791067). The N-terminal velvet domain contains a NF-kappa-B-like fold and is involved in DNA-binding (By similarity). Leads to predominant production of large tuberculate spores with spores severe viability defects (PubMed:18791067). Belongs to the velvet family. VosA subfamily.