Articles

A Metalloradical Mechanism for the Generation of Oxygen from Water in Photosynthesis

Science  26 Sep 1997:
Vol. 277, Issue 5334, pp. 1953-1956
DOI: 10.1126/science.277.5334.1953

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

In plants and algae, photosystem II uses light energy to oxidize water to oxygen at a metalloradical site that comprises a tetranuclear manganese cluster and a tyrosyl radical. A model is proposed whereby the tyrosyl radical functions by abstracting hydrogen atoms from substrate water bound as terminal ligands to two of the four manganese ions. Molecular oxygen is produced in the final step in which hydrogen atom transfer and oxygen-oxygen bond formation occur together in a concerted reaction. This mechanism establishes clear analogies between photosynthetic water oxidation and amino acid radical function in other enzymatic reactions.

  • * To whom correspondence should be addressed. E-mail: babcock{at}cemvax.cem.msu.edu

View Full Text

Related Content