Involved in sporulation-specific cell division (PubMed:19567872). Required for early stages of sporulation. Important in the process of growth cessation prior to sporulation-specific cell division (PubMed:12900022). Recruits cell division protein FtsZ to the future septum sites and tethers the contractile ring structure (Z ring) to the cytoplasmic membrane during sporulation (PubMed:21205868). Stimulates polymerization and filament length of FtsZ in vitro (By similarity). Interacts with SsgA. Interacts with FtsZ (via N-terminus). Localizes to the divisome in sporogenic aerial hyphae in a ladder-like manner (PubMed:19567872, PubMed:21205868). Temporospatial localization is controlled by SsgA and it colocalizes with SsgA in presporulation foci. Localizes to the septum sites prior to FtsZ and after that colocalizes with FtsZ at the divisome throughout cell division (PubMed:21205868). Induced at the time of aerial mycelium formation and is most abundant during sporulation (PubMed:12111561). Induced during late aerial growth and early sporulation (PubMed:16262781). Present at early division stages, predivision stage and sporulation stage (PubMed:21205868). Mainly expressed during late development (72 h) corresponding to sporulation stage, but in the presence of whiA mutant its transcription is more than 3-fold reduced and in the presence of whiH mutant it is nearly absent (PubMed:26002075). Transcriptionally regulated by stress-response sigma factor SigH of RNA polymerase (PubMed:12111561). Transcriptionally regulated by BldD (PubMed:20979333). Does not sporulate as evidenced by the white phenotype of the aerial mycelium compared to the wild-type gray (PubMed:19567872, PubMed:16262781, PubMed:12900022). Produces long non-coiling aerial hyphae typical of developmental mutants arrested in a very early stage of aerial growth (PubMed:19567872). No effect on vegetative growth or production of the pigmented antibiotics undecylprodigiosin and actinorhodin. Aerial hyphae occasionally undergo typical coiling indicating that mutation affects also later stages of the development. Aerial mycelium does not septate into spore compartments (PubMed:14513208). Increased levels of actinorhodin production. Colonies are significantly larger than wild-type and they continue to expand prior to the onset of sporulation whereas in wild-type the growth slows considerably. No DNA segregation. Aerial hyphae show irregularly shaped globular compartments often having tiny side branches, but the compartments are not separated by septa. Significant number of collapsed hyphae. Fails to grow at concentrations of 750 mM NaCl or higher (PubMed:12900022). Does not form Z ladders which are typical of sporulation-specific cell division, but still forms individual septa such as cross-walls in vegetative hyphae (PubMed:21205868). Produces some deformed spore-like bodies when ftsZ is constitutively expressed, but no intact spores are produced and only 41% of them are viable. They are very sensitive to exposure to both heat and lysozyme. The DNA in them has a spiky appearance and is surrounded by an unknown white electron-lucent mass, while the cell wall is as thin as that of aerial hyphae (PubMed:22113698). Transcription of ssgG is constitutive, ssgC transcription is enhanced and transcription of ssgE and ssgF are moderately up-regulated (PubMed:26002075). Belongs to the SsgA family. Extended N-terminus.