S-adenosyl 3-(methylsulfanyl)propylamine + putrescine ↔ S-methyl-5'-thioadenosine + spermidine + H⁺ (R1233)
- Silencing
  - Genome
putrescine + acetyl-CoA → coenzyme A + N-acetylputrescine + H⁺ (R264)
- Silencing
  - Genome
L-ornithine + carbamoyl phosphate ↔ L-citrulline + H⁺ + phosphate (R134)
- Silencing
  - Genome
putrescine + L-glutamate + ATP → γ-glutamyl-L-putrescine + H⁺ + phosphate + ADP (R2460)
- Silencing
  - Genome
putrescine + H⁺ → putrescine + H⁺ (R00804)
- Silencing
  - Genome
L-ornithine + H⁺ → putrescine + CO₂ (R1037)
- Overexpression
  - Plasmid
  - Genome
H₂O + N-acetyl-L-ornithine ↔ acetate + L-ornithine (R21)
- Overexpression
  - Genome
N-acetyl-L-glutamate 5-semialdehyde + NADP⁺ + phosphate ↔ N-acetylglutamyl-phosphate + NADPH + H⁺ (R381)
- Overexpression
  - Genome
N-acetyl-L-glutamate + ATP ↔ N-acetylglutamyl-phosphate + ADP (R374)
- Overexpression
  - Genome
N-acetyl-L-ornithine + 2-oxoglutarate ↔ N-acetyl-L-glutamate 5-semialdehyde + L-glutamate (R559)
- Overexpression
  - Genome