pfam09648: YycI (This model is not part of the current CDD release)
YycI protein
This domain is exclusively found in YycI proteins in the low GC content Gram positive species. These two domains share the same structural fold with domains two and three of YycH pfam07435. Both, YycH and YycI are always found in pair on the chromosome, downstream of the essential histidine kinase YycG. Additionally, both proteins share a function in regulating the YycG kinase with which they appear to form a ternary complex. Lastly, the two proteins always contain an N-terminal transmembrane helix and are localised to the periplasmic space as shown by PhoA fusion studies.
Jiyao W et al.(2023). "The conserved domain database in 2023.",