5h3c

Crystal structure of Arabidopsis SNC1 TIR domainCrystal structure of Arabidopsis SNC1 TIR domain

Structural highlights

5h3c is a 2 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.596Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SNC1_ARATH Disease resistance protein of the TIR-NB-LRR-type. Part of the RPP5 locus that contains a cluster of several paralogous disease resistance (R) genes. Resistance proteins guard the plant against pathogens that contain an appropriate avirulence protein via an indirect interaction with this avirulence protein. That triggers a defense system including the hypersensitive response, which restricts the pathogen growth. Regulated by RNA silencing. Expression regulated by MOS1 at chromatin level. Negatively regulated at the transcript level by BON1. Nuclear localization of SNC1 is essential for its activity (PubMed:22454454). ABA deficiency can rescue high-temperature inhibition of SNC1-mediated defense responses (PubMed:22454454).^[1] ^[2] ^[3]

Publication Abstract from PubMed

Plant immune response is initiated by Resistance proteins (R proteins). Toll/interleukin-1 receptor (TIR) domain in R proteins, which is responsible for the dimerization but has limited conservation in their primary structures. Suppressor of npr1-1, constitutive 1 (SNC1), a TIR-containing R protein, is involved in autoimmunity of plant, but the binding partner of SNC1 via the TIR domain and its specific cognate effector protein remain elusive. Here, we present the crystal structure of the TIR domain of Arabidopsis thaliana SNC1 (AtSNC1-TIR). The structure shows that AtSNC1-TIR domain is similar to those of other plant TIR domains including AtTIR, L6 and RPS4. Structural and sequence analysis on AtSNC1-TIR revealed that almost all conserved amino acids are located in the core of the structure, while the amino acids on the surface are highly variable, implicating that each TIR domain utilizes the variable surface for interacting its binding partner. In addition, the interaction between AtSNC1-TIR proteins in the crystal suggests two possible dimerization modes of AtSNC1-TIR domain. This study provides structural platform to investigate AtSNC1-TIR mediated signaling pathway of plant immune responses.

Crystal structure of Arabidopsis thaliana SNC1 TIR domain.,Hyun KG, Lee Y, Yoon J, Yi H, Song JJ Biochem Biophys Res Commun. 2016 Dec 2;481(1-2):146-152. doi:, 10.1016/j.bbrc.2016.11.004. Epub 2016 Nov 3. PMID:27818198^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Zhang Y, Goritschnig S, Dong X, Li X. A gain-of-function mutation in a plant disease resistance gene leads to constitutive activation of downstream signal transduction pathways in suppressor of npr1-1, constitutive 1. Plant Cell. 2003 Nov;15(11):2636-46. Epub 2003 Oct 23. PMID:14576290 doi:http://dx.doi.org/10.1105/tpc.015842
↑ Zhu Z, Xu F, Zhang Y, Cheng YT, Wiermer M, Li X, Zhang Y. Arabidopsis resistance protein SNC1 activates immune responses through association with a transcriptional corepressor. Proc Natl Acad Sci U S A. 2010 Aug 3;107(31):13960-5. doi:, 10.1073/pnas.1002828107. Epub 2010 Jul 20. PMID:20647385 doi:http://dx.doi.org/10.1073/pnas.1002828107
↑ Mang HG, Qian W, Zhu Y, Qian J, Kang HG, Klessig DF, Hua J. Abscisic acid deficiency antagonizes high-temperature inhibition of disease resistance through enhancing nuclear accumulation of resistance proteins SNC1 and RPS4 in Arabidopsis. Plant Cell. 2012 Mar;24(3):1271-84. doi: 10.1105/tpc.112.096198. Epub 2012 Mar, 27. PMID:22454454 doi:http://dx.doi.org/10.1105/tpc.112.096198
↑ Hyun KG, Lee Y, Yoon J, Yi H, Song JJ. Crystal structure of Arabidopsis thaliana SNC1 TIR domain. Biochem Biophys Res Commun. 2016 Dec 2;481(1-2):146-152. doi:, 10.1016/j.bbrc.2016.11.004. Epub 2016 Nov 3. PMID:27818198 doi:http://dx.doi.org/10.1016/j.bbrc.2016.11.004

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OCA

[1] Zhang Y, Goritschnig S, Dong X, Li X. A gain-of-function mutation in a plant disease resistance gene leads to constitutive activation of downstream signal transduction pathways in suppressor of npr1-1, constitutive 1. Plant Cell. 2003 Nov;15(11):2636-46. Epub 2003 Oct 23. PMID:14576290 doi:http://dx.doi.org/10.1105/tpc.015842

[2] Zhu Z, Xu F, Zhang Y, Cheng YT, Wiermer M, Li X, Zhang Y. Arabidopsis resistance protein SNC1 activates immune responses through association with a transcriptional corepressor. Proc Natl Acad Sci U S A. 2010 Aug 3;107(31):13960-5. doi:, 10.1073/pnas.1002828107. Epub 2010 Jul 20. PMID:20647385 doi:http://dx.doi.org/10.1073/pnas.1002828107

[3] Mang HG, Qian W, Zhu Y, Qian J, Kang HG, Klessig DF, Hua J. Abscisic acid deficiency antagonizes high-temperature inhibition of disease resistance through enhancing nuclear accumulation of resistance proteins SNC1 and RPS4 in Arabidopsis. Plant Cell. 2012 Mar;24(3):1271-84. doi: 10.1105/tpc.112.096198. Epub 2012 Mar, 27. PMID:22454454 doi:http://dx.doi.org/10.1105/tpc.112.096198

[4] Hyun KG, Lee Y, Yoon J, Yi H, Song JJ. Crystal structure of Arabidopsis thaliana SNC1 TIR domain. Biochem Biophys Res Commun. 2016 Dec 2;481(1-2):146-152. doi:, 10.1016/j.bbrc.2016.11.004. Epub 2016 Nov 3. PMID:27818198 doi:http://dx.doi.org/10.1016/j.bbrc.2016.11.004

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