Instituto de Bioquímica Vegetal y Fotosíntesis; Consejo Superior de Investigaciones Científicas and Universidad de Sevilla; Sevilla, Spain.
Plant Signal Behav. 2013 Mar;8(3):e23313. doi: 10.4161/psb.23313. Epub 2013 Jan 18.
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.
拟南芥 CS26 基因编码的小质体 O-乙酰丝氨酸（硫醇）裂解酶同工型已被描述为一种 S-磺基半胱氨酸合酶酶，在叶绿体功能中起着重要作用。该酶位于类囊体腔中，其 S-磺基半胱氨酸活性对于长日生长条件下叶绿体的正常光合作用性能至关重要。根据对该酶的现有了解，我们认为 S-磺基半胱氨酸合酶作为一种蛋白质传感器发挥作用，以检测硫代硫酸盐的积累，这是由于过量光照条件下产生的活性氧的解毒不足，从而产生 S-磺基半胱氨酸分子，触发光合作用装置的保护机制。
