The tobacco salicylic acid-binding protein 3 (SABP3) is the chloroplast carbonic anhydrase, which exhibits antioxidant activity and plays a role in the hypersensitive defense response.

@article{Slaymaker2002TheTS,
  title={The tobacco salicylic acid-binding protein 3 (SABP3) is the chloroplast carbonic anhydrase, which exhibits antioxidant activity and plays a role in the hypersensitive defense response.},
  author={David H Slaymaker and Duroy A. Navarre and Daniel Clark and Olga del Pozo and Gregory B Martin and Daniel F Klessig},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2002},
  volume={99 18},
  pages={11640-5}
}
In plants, salicylic acid (SA) plays an important role in signaling both local and systemic defense responses. Previous efforts to identify SA effector proteins in tobacco have led to the isolation of two soluble cytoplasmic SA-binding proteins (SABPs): catalase, SABP, and an approximately 25-kDa protein, SABP2. Here we describe the identification of an SA-binding protein, SABP3, in the stroma of tobacco chloroplasts. SABP3 bound SA with an apparent dissociation constant (K(d)) of 3.7 microM… CONTINUE READING

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