Stability of small ubiquitin-like modifier (SUMO) proteases OVERLY TOLERANT TO SALT1 and -2 modulates salicylic acid signalling and SUMO1/2 conjugation in Arabidopsis thaliana

Bailey, Mark; Srivastava, Anjil; Conti, Lucio; Nelis, Stuart; Zhang, Cunjin; Florance, Hannah; Love, Andrew; Milner, Joel; Napier, Richard; Grant, Murray; Sadanandom, Ari

doi:10.1093/jxb/erv468

Stability of small ubiquitin-like modifier (SUMO) proteases OVERLY TOLERANT TO SALT1 and -2 modulates salicylic acid signalling and SUMO1/2 conjugation in Arabidopsis thaliana

Bailey, Mark; Srivastava, Anjil; Conti, Lucio; Nelis, Stuart; Zhang, Cunjin; Florance, Hannah; Love, Andrew; Milner, Joel; Napier, Richard; Grant, Murray; Sadanandom, Ari

Authors

Mark Bailey

Anjil Srivastava

Lucio Conti

Stuart Nelis

Cunjin Zhang

Hannah Florance

Andrew Love

Joel Milner

Richard Napier

Murray Grant

Professor Ari Sadanandom ari.sadanandom@durham.ac.uk
Professor

Abstract

Small ubiquitin-like modifier proteases 1 and 2 (SUMO1/2) have been linked to the regulation of salicylic acid (SA)-mediated defence signalling in Arabidopsis thaliana. In order to define the role of the SUMO proteases OVERLY TOLERANT TO SALT1 and -2 (OTS1/2) in defence and to provide insight into SUMO1/2-mediated regulation of SA signalling, we examined the status of SA-mediated defences in ots1/2 mutants. The ots1 ots2 double mutant displayed enhanced resistance to virulent Pseudomonas syringae and higher levels of SA compared with wild-type (WT) plants. Furthermore, ots1 ots2 mutants exhibited upregulated expression of the SA biosynthesis gene ICS1 in addition to enhanced SA-responsive ICS1 expression beyond that of WT. SA stimulated OTS1/2 degradation and promoted accumulation of SUMO1/2 conjugates. These results indicate that OTS1 and -2 act in a feedback loop in SA signalling and that de novo OTS1/2 synthesis works antagonistically to SA-promoted degradation, adjusting the abundance of OTS1/2 to moderate SA signalling. Accumulation of SUMO1/2 conjugates coincides with SA-promoted OTS degradation and may play a positive role in SA-mediated signalling in addition to its repressive roles reported elsewhere.

Citation

Bailey, M., Srivastava, A., Conti, L., Nelis, S., Zhang, C., Florance, H., …Sadanandom, A. (2016). Stability of small ubiquitin-like modifier (SUMO) proteases OVERLY TOLERANT TO SALT1 and -2 modulates salicylic acid signalling and SUMO1/2 conjugation in Arabidopsis thaliana. Journal of Experimental Botany, 67(1), 353-363. https://doi.org/10.1093/jxb/erv468

Journal Article Type	Article
Acceptance Date	Oct 5, 2015
Online Publication Date	Oct 22, 2015
Publication Date	Jan 1, 2016
Deposit Date	Nov 2, 2015
Publicly Available Date	Nov 3, 2015
Journal	Journal of Experimental Botany
Print ISSN	0022-0957
Electronic ISSN	1460-2431
Publisher	Oxford University Press
Peer Reviewed	Peer Reviewed
Volume	67
Issue	1
Pages	353-363
DOI	https://doi.org/10.1093/jxb/erv468
Keywords	Arabidopsis thaliana, Defence, Pathogen, Salicylic acid (SA), Small ubiquitin-like modifier (SUMO), SUMO protease, SUMOylation.

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Advance online version © The Author 2015. Published by Oxford University Press on behalf of the Society for Experimental Biology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.