• Source: Phytoene synthase

Phytoene synthase (EC 2.5.1.32, prephytoene-diphosphate synthase, 15-cis-phytoene synthase, PSase, geranylgeranyl-diphosphate geranylgeranyltransferase) is a transferase enzyme involved in the biosynthesis of carotenoids. It catalyzes the conversion of geranylgeranyl pyrophosphate to phytoene. This enzyme catalyses the following chemical reaction

2 geranylgeranyl diphosphate



⇌


{\displaystyle \rightleftharpoons }

15-cis-phytoene + 2 diphosphate (overall reaction)
(1a) 2 geranylgeranyl diphosphate



⇌


{\displaystyle \rightleftharpoons }

diphosphate + prephytoene diphosphate
(1b) prephytoene diphosphate



⇌


{\displaystyle \rightleftharpoons }

15-cis-phytoene + diphosphate
This enzyme requires Mn2+ for activity. It belongs to squalene/phytoene synthase family of proteins.




References

Kata Kunci Pencarian:

• Karotenoid
• Phytoene synthase
• Phytoene
• Squalene/phytoene synthase family
• Farnesyl-diphosphate farnesyltransferase
• All-trans-phytoene synthase
• Carotenoid
• Golden rice
• Astaxanthin
• Prephytoene-diphosphate synthase
• CRT (genetics)