The folate precursor p-aminobenzoate is reversibly converted to its glucose ester in the plant cytosol.

@article{Quinlivan2003TheFP,
  title={The folate precursor p-aminobenzoate is reversibly converted to its glucose ester in the plant cytosol.},
  author={Eoin P. Quinlivan and Sanja Roje and Gilles J. C. Basset and Yair Shachar-Hill and J. Gregory and Andrew D. Hanson},
  journal={The Journal of biological chemistry},
  year={2003},
  volume={278 23},
  pages={20731-7}
}
Plants synthesize p-aminobenzoate (pABA) in chloroplasts and use it for folate synthesis in mitochondria. It has generally been supposed that pABA exists as the free acid in plant cells and that it moves between organelles in this form. Here we show that fruits and leaves of tomato and leaves of a diverse range of other plants have a high capacity to convert exogenously supplied pABA to its beta-D-glucopyranosyl ester (pABA-Glc), whereas yeast and Escherichia coli do not. High performance… CONTINUE READING