Identification of endogenously S-nitrosylated proteins in Arabidopsis plantlets: Effect of cold stress on cysteine nitrosylation level

Abstract

S-nitrosylation is a nitric oxide (NO)-based post-translational modification regulating protein function and signalling. We used a combination between the biotin switch method and labelling with isotope-coded affinity tag to identify endogenously S-nitrosylated peptides in Arabidopsis thaliana proteins extracted from plantlets. The relative level of S-nitrosylation in the identified peptides was compared between unstressed and cold-stress seedlings. We thereby detected 62 endogenously nitrosylated peptides out of which 20 are over-nitrosylated following cold exposure. Taken together these data provide a new repertoire of endogenously S-nitrosylated proteins in Arabidopsis with cysteine S-nitrosylation site. Furthermore they highlight the quantitative modification of the S-nitrosylation status of specific cysteine following cold stress.