InterPro domain: IPR036930

This domain superfamily is named after the most conserved central motif of the domain. It is found in a variety of polyA polymerases as well as the Escherichia coli molybdate metabolism regulator P33345 and other proteins of unknown function.The domain is found in isolation in proteins such as Q9JN21 and is between 70 and 80 residues in length. Structurally, it has a beta(4)-alpha-X-beta motif arranged into two layers (alpha/beta) with antiparallel beta-sheet, there is also beta-hairpin insertion in strand 1 which results in the formation of a beta-triangle structure.