Journal
MOLECULES
Volume 25, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/molecules25204617
Keywords
9′ -cis-neoxanthin; all-trans-neoxanthin; Bryopsidales; light harvesting complexes (LHC); photoprotection
Funding
- R&D project CtLight - FEDER, through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI) [PTDC/BIA-FBT/30979/2017]
- national funds (OE), through FCT/MCTES
- FCT/MCTES [UIDP/50017/2020, UIDB/50017/2020]
- FCT [CEECIND/01434/2018]
- Fundação para a Ciência e a Tecnologia [PTDC/BIA-FBT/30979/2017] Funding Source: FCT
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Light is a paramount parameter driving photosynthesis. However, excessive irradiance leads to the formation of reactive oxygen species that cause cell damage and hamper the growth of photosynthetic organisms. Xanthophylls are key pigments involved in the photoprotective response of plants and algae to excessive light. Of particular relevance is the operation of xanthophyll cycles (XC) leading to the formation of de-epoxidized molecules with energy dissipating capacities. Neoxanthin, found in plants and algae in two different isomeric forms, is involved in the light stress response at different levels. This xanthophyll is not directly involved in XCs and the molecular mechanisms behind its photoprotective activity are yet to be fully resolved. This review comprehensively addresses the photoprotective role of 9 '-cis-neoxanthin, the most abundant neoxanthin isomer, and one of the major xanthophyll components in plants' photosystems. The light-dependent accumulation of all-trans-neoxanthin in photosynthetic cells was identified exclusively in algae of the order Bryopsidales (Chlorophyta), that lack a functional XC. A putative photoprotective model involving all-trans-neoxanthin is discussed.
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