Uncharacterized conserved protein YabE, contains G5 and tandem DUF348 domains [Function unknown].

G5 domain. This domain is found in a wide range of extracellular proteins. It is found tandemly repeated in up to 8 copies. It is found in the N-terminus of peptidases belonging to the M26 family which cleave human IgA. The domain is also found in proteins involved in metabolism of bacterial cell walls suggesting this domain may have an adhesive function.

Domain of unknown function (DUF348). 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.

core lysozyme-like domain of resuscitation-promoting factor proteins. Resuscitation-promoting factor (RPF) proteins, found in various (G+C)-rich Gram-positive bacteria, act to reactivate cultures from stationary phase. This protein shares elements of the structural core of lysozyme and related proteins. Furthermore, it shares a conserved active site glutamate which is required for activity, and has a polysaccharide binding cleft that corresponds to the peptidoglycan binding cleft of lysozyme. Muralytic activity of Rpf in Micrococcus luteus correlates with resuscitation, supporting a mechanism dependent on cleavage of peptidoglycan by RPF.

Phage tail lysozyme. This domain has a lysozyme like fold. It is found in the tail protein of various phages probably giving them the ability to degrade the host cell wall peptidoglycan layer.