Phytochelatins (PCs) are small enzymatically synthesized peptides having a general structure of [poly-(gamma-Glu-Cys)n-Xaa] polymers where n equals 2 to 11. They are found in all plant species investigated, a few fungal species, and some marine diatoms, where they act as high affinity metal chelators. In iso-phytochelatins, the polymer is capped C-terminally by a serine, glutamine, glutamic acid or in homo-phytochelatin with beta-alanine.
Lee, S. et al. Plant Physiol.131, 656 (2003); Rauser, W. Phytochel. Ann. Rev. Biochem.59, 61 (1990); Vatamaniuk, O. et al. J. Biol. Chem.279, 22449 (2004); Grill, E. et al. FEBS Lett.205, 47 (1986).
Sequence (One-Letter Code)
Sequence (Three-Letter Code)
H - gamma - Glu - Cys - gamma - Glu - Cys - beta - Ala - OH