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Pubmed ID :20529854
Publication Date : //

Binding of cysteine synthase to the STAS domain of sulfate transporter and its regulatory consequences.


The sulfate ion (SO(4)(2-)) is transported into plant root cells by SO(4)(2-) transporters and then mostly reduced to sulfide (S(2-)). The S(2-) is then bonded to O-acetylserine through the activity of cysteine synthase (O-acetylserine (thiol)lyase or OASTL) to form cysteine, the first organic molecule of the SO(4)(2-) assimilation pathway. Here, we show that a root plasma membrane SO(4)(2-) transporter of Arabidopsis, SULTR1;2, physically interacts with OASTL. The interaction was initially demonstrated using a yeast two-hybrid system and corroborated by both in vivo and in vitro binding assays. The domain of SULTR1;2 shown to be important for association with OASTL is called the STAS domain. This domain is at the C terminus of the transporter and extends from the plasma membrane into the cytoplasm. The functional relevance of the OASTL-STAS interaction was investigated using yeast mutant cells devoid of endogenous SO(4)(2-) uptake activity but co-expressing SULTR1;2 and OASTL. The analysis of SO(4)(2-) transport in these cells suggests that the binding of OASTL to the STAS domain in this heterologous system negatively impacts transporter activity. In contrast, the activity of purified OASTL measured in vitro was enhanced by co-incubation with the STAS domain of SULTR1;2 but not with the analogous domain of the SO(4)(2-) transporter isoform SULTR1;1, even though the SULTR1;1 STAS peptide also interacts with OASTL based on the yeast two-hybrid system and in vitro binding assays. These observations suggest a regulatory model in which interactions between SULTR1;2 and OASTL coordinate internalization of SO(4)(2-) with the energetic/metabolic state of plant root cells.

Authors : Shibagaki Nakako , Grossman Arthur R ,

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