RING finger, H2 subclass, found in defective in mitotic arrest proteins (Dmap) and similar proteins
This subfamily includes Schizosaccharomyces pombe protein Dma1 (SpDma1p), Saccharomyces cerevisiae proteins Dma1 (ScDma1p) and Dma2 (ScDma2p), and their homologs from fungi. SpDma1p was originally isolated as a multicopy suppressor of the temperature-sensitive growth phenotype caused by cdc16 mutations. It functions to prevent mitotic exit and cytokinesis during spindle checkpoint arrest by inhibiting septation initiation network (SIN) signaling. ScDma1p and ScDma2p, also known as checkpoint forkhead associated with RING domains-containing protein 1 and 2 respectively, seem to be functionally redundant. They are involved in proper septin ring positioning and cytokinesis. The simultaneous lack of Dma1 and Dma2 leads to spindle mispositioning and defects in the spindle position checkpoint. All members of this family contain a forkhead-associated (FHA) domain and a C3H2C3-type RING-H2 finger, the latter suggesting they may possess E3 ubiquitin-ligase activities.
Comment:C3H2C3-type RING-H2 finger consensus motif: C-X2-C-X(9-39)-C-X(1-3)-H-X(2-3)-H-X2-C-X(4-48)-C-X2-C, where X is any amino acid and the number of X residues varies in different fingers
Comment:A RING finger typically binds two zinc atoms, with its Cys and/or His side chains in a unique "cross-brace" arrangement.
Jiyao W et al.(2023). "The conserved domain database in 2023.",