Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/2XHH
CARBOHYDRATE BINDING MODULE(2S)-2-hydroxybutanedioic acidCALCIUM ION
circular permutationtwo familiesprovidesevolutionary
https://www.ncbi.nlm.nih.gov/Structure/pdb/4RNU
NADPH dehydrogenase 1FLAVIN MONONUCLEOTIDEPHOSPHATE ION
old yellow enzymecircular permutation