Ζ-Carotene
ζ-Carotene is a carotenoid. It is different from α-carotene and β-carotene because it is acyclic. ζ-Carotene is similar in structure to lycopene, but has an additional 4 hydrogen atoms. ζ-carotene can be used as an intermediate in forming β-carotene. A dehydrogenation reaction converts ζ-carotene into lycopene, which then can be transformed into β-carotene through the action of lycopene beta-cyclase. ζ-Carotene is a natural product found in Lonicera japonica and Rhodospirillum rubrum.
Biosynthesis and role
ζ-carotene is formed in plants as an intermediate in the carotenoid biosynthetic pathway. It is produced through sequential desaturation of phytoene by phytoene desaturase and ζ-carotene desaturase enzymes ζ-Carotene occupies a key position in the pathway, serving as a precursor to lycopene, which is further converted into essential carotenoids such as β-carotene. These downstream carotenoids are vital for plant functions, including photosynthesis, photoprotection, and hormone synthesis. Thus, ζ-carotene plays an important regulatory and biosynthetic role in plant metabolism.
Zeta-carotene has gained attention in plant biotechnology due to its role as an intermediate in carotenoid biosynthesis. Advances in synthetic biology have enabled targeted manipulation of carotenoid pathways, with zeta-carotene serving as a key point for regulating the production of downstream compounds such as lycopene and β-carotene. These strategies aim to optimize carotenoid composition in plants to enhance nutritional value, improve stress tolerance, and increase pigment content for industrial uses. As such, zeta-carotene has become an important focus in efforts to engineer plant metabolism for agricultural and commercial benefits.