Members of this family are small hypothetical proteins of 60 to 100 residues from Cyanobacteria and some Proteobacteria. Prochlorococcus marinus strains have two members, other species one only. Interestingly, of the eight most conserved residues, four are aromatic and three are invariant tryptophans. It appears all species that encode this protein can synthesise tryptophan de novo.
","llm":false,"checked":false,"updated":false}],"wikipedia":[{"title":"Domain_of_unknown_function","extract":"A domain of unknown function (DUF) is a protein domain that has no characterised function. These families have been collected together in the Pfam database using the prefix DUF followed by a number, with examples being DUF2992 and DUF1220. As of 2019, there are almost 4,000 DUF families within the Pfam database representing over 22% of known families. Some DUFs are not named using the nomenclature due to popular usage but are nevertheless DUFs.
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