| Q8II73 | n/a | 4uoe | 4ZY | A | 501 | e4uoeA1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 4uoe | 4ZY | A | 501 | e4uoeA2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q8II73 | n/a | 4uoe | 4ZY | B | 501 | e4uoeB1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 4uoe | 4ZY | B | 501 | e4uoeB2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q8II73 | n/a | 4uoe | 4ZY | C | 501 | e4uoeC1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 4uoe | 4ZY | C | 501 | e4uoeC2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |