| A3MU81 | n/a | 7xii | AG3 | A | 302 | e7xiiA1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| A3MU81 | n/a | 7xii | AG3 | A | 302 | e7xiiA2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| A3MU81 | n/a | 7xii | AG3 | B | 302 | e7xiiB1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| A3MU81 | n/a | 7xii | AG3 | B | 302 | e7xiiB2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| A3MU81 | n/a | 7xii | AG3 | C | 302 | e7xiiC1 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| A3MU81 | n/a | 7xii | AG3 | C | 302 | e7xiiC2 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| A3MU81 | n/a | 7xii | AG3 | D | 302 | e7xiiD1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| A3MU81 | n/a | 7xii | AG3 | D | 302 | e7xiiD2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |