<p>This entry represents nucleotide-binding domains with an alpha-beta plait structure, which consists of either a ferredoxin-like (beta-alpha-beta)2 fold, such as that found in RNA-binding domains of various ribonucleoproteins or in viral DNA-binding domains [<cite idref="PUB00016352"/>, <cite idref="PUB00007413"/>]; or a beta-(alpha)-beta-alpha-beta(2) fold, such as that found in the ribosomal protein L23 [<cite idref="PUB00016354"/>].</p>