This arginine rich domain is found at the C-terminal end of YjiS from Salmonella Typhimurium and similar short sequences from proteobacteria. YjiS, an inner membrane-associated small protein, acts as as a suppressor of flagella production, leading to pathogen escape from infected host cells [[cite:PUB00160930]]. In the plant pathogen Agrobacterium tumefaciens, some small proteins that contain this domain are involved in nutrient acquisition and central carbon metabolism [[cite:PUB00160928]]. CcaF1 from Rhodobacter sphaeroides is an RNA binding protein that has a role in the oxidative stress defence [[cite:PUB00160929]]. In some uncharacterised proteins, this domain, previously known as DUF1127, covers the whole sequence.
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