| Class c: Alpha and beta proteins (a/b) [51349] (147 folds) | 
| Fold c.55: Ribonuclease H-like motif [53066] (7 superfamilies) 3 layers: a/b/a; mixed beta-sheet of 5 strands, order 32145; strand 2 is antiparallel to the rest  | 
Superfamily c.55.1: Actin-like ATPase domain [53067] (14 families) ![]() duplication contains two domains of this fold  | 
| Family c.55.1.1: Actin/HSP70 [53068] (7 proteins) | 
| Protein Prokaryotic actin homolog MreB [64087] (1 species) | 
| Species Thermotoga maritima [TaxId:2336] [64088] (3 PDB entries) | 
| Domain d1jcea1: 1jce A:4-140 [62876] | 
| Domain d1jcea2: 1jce A:141-336 [62877] | 
| Domain d1jcfa1: 1jcf A:1-140 [62878] | 
| Domain d1jcfa2: 1jcf A:141-336 [62879] | 
| Domain d1jcga1: 1jcg A:1-140 [62880] complexed with anp, mg  | 
| Domain d1jcga2: 1jcg A:141-335 [62881] complexed with anp, mg  | 
Timeline for Species Thermotoga maritima [TaxId:2336] from c.55.1.1 Prokaryotic actin homolog MreB: