Competence protein. Members of this family are integral membrane proteins with 6 predicted transmembrane helices. Some members of this family have been shown to be essential for bacterial competence in uptake of extracellular DNA. These proteins may transport DNA across the cell membrane. These proteins contain a highly conserved motif in the amino terminal transmembrane region that has two histidines that may form a metal binding site.

Vta1 like. Vta1 (VPS20-associated protein 1) is a positive regulator of Vps4. Vps4 is an ATPase that is required in the multivesicular body (MVB) sorting pathway to dissociate the endosomal sorting complex required for transport (ESCRT). Vta1 promotes correct assembly of Vps4 and stimulates its ATPase activity through its conserved Vta1/SBP1/LIP5 region.

1,3-beta-glucan synthase subunit FKS1, domain-1. The FKS1_dom1 domain is likely to be the 'Class I' region just N-terminal to the first set of transmembrane helices that is involved in 1,3-beta-glucan synthesis itself. This family is found on proteins with family Glucan_synthase, pfam02364.

1,3-beta-glucan synthase component. This family consists of various 1,3-beta-glucan synthase components including Gls1, Gls2 and Gls3 from yeast. 1,3-beta-glucan synthase EC:2.4.1.34 also known as callose synthase catalyzes the formation of a beta-1,3-glucan polymer that is a major component of the fungal cell wall. The reaction catalyzed is:- UDP-glucose + {(1,3)-beta-D-glucosyl}(N) <=> UDP + {(1,3)-beta-D-glucosyl}(N+1).