| Q4DA73 | n/a | 4yv2 | 4K3 | B | 303 | e4yv2A1 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q4DA73 | n/a | 4yv2 | 4K3 | B | 303 | e4yv2A2 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q4DA73 | n/a | 4yv2 | 4K3 | B | 303 | e4yv2B1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q4DA73 | n/a | 4yv2 | 4K3 | B | 303 | e4yv2B2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |