Transcriptional factor that regulates positively or negatively the expression of a large number of forespore-specific sigma G-dependent genes. May provide a mechanism of feedback control that is important for forespore development (PubMed:8755877). SpoVT levels during spore formation have a major impact on the germination and the resistance of the resultant spores (PubMed:22522895). Homotetramer (PubMed:18996130) (Probable). Two monomers dimerize via their N-terminal swapped-hairpin domains. These dimers further associate into tetramers through helical interactions between their C-terminal GAF-like domains (PubMed:18996130). Expression is regulated by the sporulation transcription factor sigma G. The N-terminal domain binds DNA non-specifically and the C-terminal GAF-like domain is crucial to its correct folding and function. The non-specific DNA-binding activity of the N-terminal domain is modulated by the C-terminal domain, which perhaps in combination with another unknown factor, confers activity and specificity. Deletion of the gene leads to aberrantly formed spores (PubMed:8755877). Mutant spores release their dipicolinic acid (DPA) via germinant receptor (GR)-dependent germination more rapidly than wild-type spores. Spores are also more sensitive to UV radiation and outgrow slowly (PubMed:22522895). To B.subtilis AbrB and Abh.