Influence of Ca(2+) on the thylakoid lumen violaxanthin de-epoxidase activity through Ca(2+) gating of H(+) flux at the CF(o) H(+) channel.

@article{Pan2000InfluenceOC,
  title={Influence of Ca(2+) on the thylakoid lumen violaxanthin de-epoxidase activity through Ca(2+) gating of H(+) flux at the CF(o) H(+) channel.},
  author={R. S. Pan and Richard A. Dilley},
  journal={Photosynthesis research},
  year={2000},
  volume={65 2},
  pages={141-54}
}
Part of the chloroplast photoprotection response to excess light absorption involves formation of zeaxanthin (and antheraxanthin) via the violaxanthin deepoxidase enzyme, the activity of which requires lumen acidity near or below pH 6.0. Clearly, the violaxanthin de-epoxidase activity is strongly regulated because at equivalent energization levels (including the parameters of H(+) accumulation and ATP formation rates), there can be either low or high violaxanthin de-epoxidase enzyme activity… CONTINUE READING