Lineage for Species: Aquifex aeolicus [TaxId: 63363]

1. Root: SCOPe 2.08

2. Class a: All alpha proteins [46456] (290 folds)

3. Fold a.22: Histone-fold [47112] (1 superfamily) core: 3 helices; long middle helix is flanked at each end with shorter ones

4. Superfamily a.22.1: Histone-fold [47113] (5 families)

5. Family a.22.1.4: Bacterial histone-fold protein [101318] (3 proteins) duplication: two repeats of histone fold are arranged as subunits in the archael histone dimer; new structure from Thermus thermophilus (1wws) comprised of dimers similar the to the H3-H4 tetramer automatically mapped to Pfam PF09123

6. Protein Hypothetical protein Aq_328 [101319] (1 species)

7. Species Aquifex aeolicus [TaxId:63363] [101320] (1 PDB entry)