CAB40 — Brassica juncea

Summary

BJUB08G19720S (CAB40, BjLHCB5) encodes a chlorophyll a/b-binding protein, possessing chlorophyll-binding, serine-type peptidase, and 7-hydroxymethyl chlorophyll a reductase activities, and is associated with protein-folding chaperone activity. The gene is associated with photosynthesis, light harvesting in both photosystems I and II, nonphotochemical quenching, photosystem II repair and assembly, chlorophyll cycling and metabolism, protein breakdown and folding, and responses to light, cold, salinity, and thirst. It localises to the thylakoid membrane, photosystem II antenna complex, LHCII, and chloroplast stroma. Associations include chlorophyll content, leaf senescence, root morphology, photoprotection, photosynthetic rate and efficiency, energy transfer, neoxanthin binding, violaxanthin de-epoxidation, and stomatal response to abscisic acid. Studies of related genes in other species link the family to drought tolerance, abscisic acid sensitivity, quantum yield, and sodium concentration.