This family of proteins is involved in spore coat assembly during the process of sporulation [1]. Proteins in this family consist of five anti-parallel beta strands [2].

1: Dynamic patterns of subcellular protein localization during spore coat morphogenesis in Bacillus subtilis. van Ooij C, Eichenberger P, Losick R; J Bacteriol 2004;186:4441-4448. PMID:15231775

2: Solution NMR structure of Dsy0195 homodimer from Desulfitobacterium hafniense: first structure representative of the YabP domain family of proteins involved in spore coat assembly. Yang Y, Ramelot TA, Cort JR, Wang H, Ciccosanti C, Jiang M, Janjua H, Acton TB, Xiao R, Everett JK, Montelione GT, Kennedy MA; J Struct Funct Genomics. 2011;12:175-179. PMID:21904870