This domain of unknown function is found in fungal proteins including Mug8 from Schizosaccharomyces pombe which may have a role in meiosis and septation [1]. Saccharomyces cerevisiae homologue MSB1 (swiss:P21339) may be involved in positive regulation of 1,3-beta-glucan synthesis and the Pkc1p-MAPK pathway [2].

1: A large-scale screen in S. pombe identifies seven novel genes required for critical meiotic events. Martin-Castellanos C, Blanco M, Rozalen AE, Perez-Hidalgo L, Garcia AI, Conde F, Mata J, Ellermeier C, Davis L, San-Segundo P, Smith GR, Moreno S; Curr Biol. 2005;15:2056-2062. PMID:16303567

2: Dissection of upstream regulatory components of the Rho1p effector, 1,3-beta-glucan synthase, in Saccharomyces cerevisiae. Sekiya-Kawasaki M, Abe M, Saka A, Watanabe D, Kono K, Minemura-Asakawa M, Ishihara S, Watanabe T, Ohya Y; Genetics. 2002;162:663-676. PMID:12399379