Nitric oxide synthase-like activity in higher plants

- In higher plants exist a nitric oxide synthase (NOS)-like activity.
- This activity has the same biochemical requirements (L-Arg, NADPH, FMN, FAD, CaM and Ca2+) to those of animal NOS.
- In higher plants, no ortholog genes have been found in any classic mammalian NOSs.
- The NOS-like activity could result of the cooperation between discrete proteins which together can generate NO.