pfam03990: DUF348 (This model is not part of the current CDD release)
G5-linked-Ubiquitin-like domain
This domain normally occurs as tandem repeats; however it is found as a single copy in the S. cerevisiae DNA-binding nuclear protein YCR593. This protein is involved in sporulation part of the SET3C complex, which is required to repress early/middle sporulation genes during meiosis. The bacterial proteins are likely to be involved in a cell wall function as they are found in conjunction with the pfam07501 domain, which is involved in various cell surface processes. This domain is also present in the resuscitation-promoting factors RpfB from Mycobacterium tuberculosis and Rpf2 from Corynebacterium glutamicum. These are factors that stimulate resuscitation of dormant cells. This domain has a beta grasp fold. Structural description of this domain revealed a structural conservation between these domains and ubiquitin, hence it is termed UBL-G5.
Jiyao W et al.(2023). "The conserved domain database in 2023.",