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Proteomic analysis of lysine acetylation provides strong evidence for involvement of acetylated histone and chloroplast proteins in CWMV infected plant

ABSTRACT: Protein lysine acetylation (Kac) is an important post-translational modification (PTM) mechanism in both eukaryotes and prokaryotes, with key roles in cellular regulation. To investigate the role of Kac in plants infected with virus, we characterized the lysine acetylome of Nicotiana benthamiana plants with or without a Chinese Wheat Mosaic Virus (CWMV) infection by using TMT labeling-based protein modification differential analysis, high-resolution liquid chromatography mass spectrometry analysis, and integrated bioinformatics analysis. Here, we identified 4803 acetylated lysine sites on 1964 proteins. A comparison of the acetylation levels of the CWMV-infected group with those of the uninfected group revealed that 747 sites were up-regulated on 422 proteins, including chloroplast localization proteins and histone H3, and 150 sites were down-regulated on 102 proteins when using a change threshold of at least 1.2 times and a t-test p-value of <0.05. Nineteen conserved motifs were extracted; 51% of the identified proteins were localized to the chloroplast. Among the acetylated proteins, 19 Kac sites were combined in core histones, including 10 Kac sites on histone 3. Bioinformatics analysis revealed that Kac occurs on a diverse range of proteins involved in a wide variety of biological processes, especially photosynthesis. Furthermore, we demonstrate that the acetylation level of chloroplast localization proteins and histone H3 are significantly increased. In summary, our results reveal the regulatory roles of Kac in response to CWMV infection.

INSTRUMENT(S): Q Exactive Plus

ORGANISM(S): Nicotiana Tabacum (common Tobacco)

TISSUE(S): Leaf

SUBMITTER: xiaonan fu

LAB HEAD: Jianping Chen

PROVIDER: PXD012537 | Pride | 2021-05-07

REPOSITORIES: Pride

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Project description:Specific histone modifications play important roles in chromatin functions such as activation or repression of gene transcription. These participation must occur as a dynamic process, however, most of histone modification state maps reported to date only provide static pictures linking certain modification with active or silenced states. This study focused on the global histone modification variation that occurs in response to transcriptional reprogramming produced by a physiological perturbation in yeast. We have performed genome-wide chromatin immunoprecipitation analysis for eight specific histone modifications before and after of a saline stress. The most striking change is a quick deacetylation of lysines 9 and 14 of H3 and lysine 8 of H4 associated to repression of genes. Genes that are activated increase the acetylation levels at these same sites, but this acetylation process of activated genes seems minor quantitatively to that of the deacetylation of repressed genes. The observed changes in tri-methylation of lysines 4, 36 and 79 of H3 and also di-methylation of lysine 79 of H3 are much more moderate than those of acetylation. Additionally, we have produced new genome-wide maps for six histone modifications at more than five times higher resolution of previous available data and analyzed for the first time in S. cerevisiae genome wide profiles of two more, acetylation of lysine 8 of H4 and di-methylation of lysine 79 of H3. In this research we have shown that dynamic of acetylation state of histones during activation or repression of transcription is a process much quicker than methylation and therefore the changes produced in the acetylation may affect methylation but the reverse path is not possible. The experiments described in this study compare ChIP with a histone modification antibody to a control ChIP with a core histone antibody. Budding yeast samples were analyzed in exponential growing conditions (YPD) or after 10 minutes of 0.4M NaCl stress. For each experiment 1 or 2 biological replicates were performed.

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Proteomic analysis of lysine acetylation provides strong evidence for involvement of acetylated histone and chloroplast proteins in CWMV infected plant

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