Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705351
Title: Redox regulation of salicylic acid synthesis in plant immunity
Author: Li, Yuan
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2016
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Abstract:
Salicylic acid (SA) is essential to the establishment of both local and systemic acquired resistance (SAR) against a wide range of phytopathogens. Isochorismate synthase 1 (ICS1) is the key enzyme involved in the synthesis of SA and it is transcriptionally activated by the regulatory proteins SAR deficient 1 (SARD1) and Calmodulin binding protein 60g (CBP60g). It has been demonstrated previously that the loss-of-function mutant, S-nitrosogluthione reductase 1-3 (gsnor1-3), increased cellular levels of S-nitrosylation. Significantly, accumulation of both free SA and its storage form SA-glucoside (SAG), were substantially reduced, disabling multiple SA-dependent immune responses. However, the molecular mechanism underlying this observation remains to be established. Our data suggests that the transcription of ICS1 and it regulators, SARD and CBP60g, are reduced in the gsnor1-3 mutant, implying that increased cellular S-nitrosylation blunts the expression of ICS1 by reducing the transcription of its activators. We demonstrated that SARD1 is S-nitrosylated in vitro resulting in inhibition of its DNA binding activity. Further, Cys438 of SARD1 was found to be the site of S-nitrosylation, demonstrated by the observation that the SARD1 C438S mutant was insensitive to NO regulation in regard to DNA binding activity.
Supervisor: Loake, Gary ; Spoel, Steven Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.705351  DOI: Not available
Keywords: salicylic acid ; SARD1 ; Isochorismate synthase 1 ; CS1 ; DNA binding activity
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