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Protein complex reveals molecular mechanism of innate immune response

Date:
July 30, 2010
Source:
RIKEN
Summary:
A team of researchers at the RIKEN Plant Science Center and the Institute of Cancer Research has uncovered details of a protein complex governing innate immune response in plants and animals, with applications in the development of disease-resistant crops and treatment of human diseases.
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Crystal structure of the HSP90-N - SGT1-CS - RAR1-CHORDII complex, consisting of the HSP90-N domain (cyan), SGT1-CS domain (gold) and RAR1-CHORDII domain (magenta). The crystal structure is made up of two copies of each protein.
Credit: Image courtesy of RIKEN

A team of researchers at the RIKEN Plant Science Center and the Institute of Cancer Research has uncovered details of a protein complex governing innate immune response in plants and animals, with applications in the development of disease-resistant crops and treatment of human diseases.

To defend against foreign pathogens, plants and animals employ proteins known as immune sensors which recognize extracellular molecules and initiate immune response. Despite playing a critical in innate immunity, the underlying mechanisms governing this recognition process have remained elusive. Previous work by the team has shown that in plants, HSP90, a molecular chaperone, binds to the proteins SGT1 and RAR1 to form a complex which mediates the activity of immune sensors, but the dynamic nature of the complex has prevented a detailed understanding of its structure and role.

The researchers applied a variety of analysis techniques to overcome this challenge, each targeting different aspects of the RAR1-SGT1-HSP90 complex. Biochemical analysis identified the CHORD2 domain of RAR1 and the CS domain of SGT1 as essential to formation of the complex, while crystal structure analysis revealed that the complex is made up of six proteins in a ring configuration, with two copies of each component. Functionally, the team identified RAR1-SGT1 interaction as playing a key role in disease resistance, also providing evidence that interaction of RAR1 and HSP90 increases decomposition of ATP and boosts the efficiency of immune sensor control.

Reported in the July 30 issue of Molecular Cell, these findings provide the first detailed framework for understanding the architecture of HSP90-SGT1-CHORD protein complexes, whose role in immune defense is shared in both plants and animals. Future applications in agriculture and health promise increased crop yields through disease resistance and new treatments for human diseases.


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The above post is reprinted from materials provided by RIKEN. Note: Materials may be edited for content and length.


Journal Reference:

  1. Minghao Zhang, Yasuhiro Kadota, Chrisostomos Prodromou, Ken Shirasu and Laurence H. Pearl. Structural basis for assembly of Hsp90 - Sgt1 - CHORD protein complexes: implications for chaperoning of NLR innate immunity receptors. Molecular Cell, July 30, 2010

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RIKEN. "Protein complex reveals molecular mechanism of innate immune response." ScienceDaily. ScienceDaily, 30 July 2010. <www.sciencedaily.com/releases/2010/07/100729122427.htm>.
RIKEN. (2010, July 30). Protein complex reveals molecular mechanism of innate immune response. ScienceDaily. Retrieved September 4, 2015 from www.sciencedaily.com/releases/2010/07/100729122427.htm
RIKEN. "Protein complex reveals molecular mechanism of innate immune response." ScienceDaily. www.sciencedaily.com/releases/2010/07/100729122427.htm (accessed September 4, 2015).

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