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The N resistance protein recognizes ...

Burch-Smith, Tessa Maureen.

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The N resistance protein recognizes its tobacco mosaic virus elicitor through a novel mechanism.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The N resistance protein recognizes its tobacco mosaic virus elicitor through a novel mechanism./
Author:	Burch-Smith, Tessa Maureen.
Description:	137 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1819.
Contained By:	Dissertation Abstracts International67-04B.
Subject:	Biology, Molecular. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3214185
ISBN:	9780542651335

The N resistance protein recognizes its tobacco mosaic virus elicitor through a novel mechanism.
Burch-Smith, Tessa Maureen.

The N resistance protein recognizes its tobacco mosaic virus elicitor through a novel mechanism. - 137 p.

Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1819.

Thesis (Ph.D.)--Yale University, 2006.

In their natural environments plants are constantly attacked by a variety of pathogens. Plants have therefore evolved diverse defense mechanisms that allow them to evade the assaults. One strategy used by plants relies on germ-line encoded molecules encoded by Resistance (R) genes that specifically recognize the presence of gene products of corresponding Avirulence (Avr) gene carried by a given pathogen and then initiate defense responses. To date, more than forty R genes, which confer resistance to all classes of plant pathogens, have been cloned. R gene products show striking similarity. They contain a few conserved domains including the TIR, CC, NB and LRR domains. These domains are also found in animal innate immune molecules, especially the TLRs and NODs. The mechanism that R proteins use to recognize pathogen-derived Avr proteins and then to initiate defense signaling was investigated. The tobacco model system, which consists of the tobacco N gene and the tobacco mosaic virus replicase proteins, was used in these studies. N is a TIR-NB-LRR type R protein. Yeast screens with the LRR domain of N and the full length N protein identified several potential interaction partners for N including HSP90, PP5 and SPL transcription. These and proteins that they are known to associate with were examined for their roles in N-mediated resistance using VIGS. All except PP5 were required for N function. N was found to be a cytoplasmic and, to a lesser extent, nuclear protein. The localization of N does not change on infection with TMV or in the presence of its Avr protein. N was also found to associate in vivo with its Avr elicitor, the 50-kDa helicase domain of the viral replicase, p50. This is the first report of an in vivo association between an R and Avr protein. Surprisingly, the TIR domain of N is necessary and sufficient for this association. These data have been integrated into existing models for R-Avr interaction and used to develop a new model for the function of N. The results presented here also suggest novel functions for the conserved TIR domain and indeed for R proteins.

ISBN: 9780542651335Subjects--Topical Terms:

1017719
Biology, Molecular.

The N resistance protein recognizes its tobacco mosaic virus elicitor through a novel mechanism.
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100 1 $a Burch-Smith, Tessa Maureen. $3 1917777
245 1 4 $a The N resistance protein recognizes its tobacco mosaic virus elicitor through a novel mechanism.
300 $a 137 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1819.
500 $a Adviser: Savithramma P. Dinesh-Kumar.
502 $a Thesis (Ph.D.)--Yale University, 2006.
520 $a In their natural environments plants are constantly attacked by a variety of pathogens. Plants have therefore evolved diverse defense mechanisms that allow them to evade the assaults. One strategy used by plants relies on germ-line encoded molecules encoded by Resistance (R) genes that specifically recognize the presence of gene products of corresponding Avirulence (Avr) gene carried by a given pathogen and then initiate defense responses. To date, more than forty R genes, which confer resistance to all classes of plant pathogens, have been cloned. R gene products show striking similarity. They contain a few conserved domains including the TIR, CC, NB and LRR domains. These domains are also found in animal innate immune molecules, especially the TLRs and NODs. The mechanism that R proteins use to recognize pathogen-derived Avr proteins and then to initiate defense signaling was investigated. The tobacco model system, which consists of the tobacco N gene and the tobacco mosaic virus replicase proteins, was used in these studies. N is a TIR-NB-LRR type R protein. Yeast screens with the LRR domain of N and the full length N protein identified several potential interaction partners for N including HSP90, PP5 and SPL transcription. These and proteins that they are known to associate with were examined for their roles in N-mediated resistance using VIGS. All except PP5 were required for N function. N was found to be a cytoplasmic and, to a lesser extent, nuclear protein. The localization of N does not change on infection with TMV or in the presence of its Avr protein. N was also found to associate in vivo with its Avr elicitor, the 50-kDa helicase domain of the viral replicase, p50. This is the first report of an in vivo association between an R and Avr protein. Surprisingly, the TIR domain of N is necessary and sufficient for this association. These data have been integrated into existing models for R-Avr interaction and used to develop a new model for the function of N. The results presented here also suggest novel functions for the conserved TIR domain and indeed for R proteins.
590 $a School code: 0265.
650 4 $a Biology, Molecular. $3 1017719
650 4 $a Agriculture, Plant Pathology. $3 1028950
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791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3214185