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Taylor and Francis Group, Plant Signaling & Behavior, 3(8), p. e23313, 2013

DOI: 10.4161/psb.23313

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S-sulfocysteine synthase function in sensing chloroplast redox status

Journal article published in 2013 by Cecilia Gotor ORCID, Luis C. Romero ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The minor chloroplastic O-acetylserine(thiol)lyase isoform encoded by the CS26 gene in Arabidopsis thaliana has been described as an S-sulfocysteine synthase enzyme that plays an important role in chloroplast function. This enzyme is located in the thylakoid lumen, and its S-sulfocysteine activity is essential for the proper photosynthetic performance of the chloroplast under long-day growth conditions. Based on the present knowledge of this enzyme, we suggest that S-sulfocysteine synthase functions as a protein sensor to detect the accumulation of thiosulfate as a result of the inadequate detoxification of reactive oxygen species generated under conditions of excess light to produce the S-sulfocysteine molecule that triggers protection mechanisms of the photosynthetic apparatus.