Abstract
Cell wall proteins (CWPs) are a prime site for signal perception and defense responses to environmental stresses. To gain further insights into CWPs and their molecular function, traditional techniques (e.g., two-dimensional gel electrophoresis) may be ineffective for special proteins. Elsholtzia splendens is a copper-tolerant plant species that grow on copper deposits. In this study, a fourplex isobaric tag was used for relative and absolute quantitation with liquid chromatography–tandem mass spectrometry approach to analyze the root CWPs of E. splendens. A total of 479 unique proteins were identified, including 121 novel proteins. Approximately 80.79 % of the proteins were extracted in the CaCl2 fraction, 16.08 % were detected in the NaCl fraction, and 3.13 % were identified in both fractions. The identified proteins have been involved in various processes, including cell wall remodeling, signal transduction, defense, and carbohydrate metabolism, thereby indicating a complex regulatory network in the apoplast of E. splendens roots. This study presents the first large-scale analysis of CWPs in metal-tolerant plants, which may be of paramount importance to understand the molecular functions and metabolic pathways in the root cell wall of copper-tolerant plants.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (41422107, 21177109), the Fundamental Research Funds for the Central Universities (2015XZZX004-15), and Zhejiang University K. P. Chao’s High Technology Development Foundation (2014RC011). The authors would like to express their deepest gratitude to Dongfeng Liu from the College of Agriculture and Biotechnology in Zhejiang University for her kind help during the experiments.
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Highlights
• First large-scale analysis of CWPs in metal-tolerant plants
• Enhancement of knowledge regarding complexity of apoplast proteins in metal-tolerant plants
• Clues for further functional research of target proteins associated with metal-tolerant plants
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Fig. S1
Workflow of the experimental design for iTRAQ labeling showing biological replicates. Cell wall proteins from CaCl2 extraction were labeled with 114 and 116, respectively; Cell wall proteins from NaCl extraction were labeled with 115 and 117, respectively (DOC 28 kb)
Table S1
Subcellular localization and GO terms corresponding to the biological process of the 479 root cell wall proteins (XLS 506 kb)
Table S2
Relative quantitative information in CaCl2- and NaCl-extracted protein samples using 4-plex iTRAQ technology (XLS 277 kb)
Table S3
Peptides from 479 unique proteins (XLS 1841 kb)
Table S4
A total of 479 CWPs were identified including 121 novel proteins (DOC 774 kb)
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Liu, T., Huang, C., Shen, C. et al. Isolation and Analysis of Cell Wall Proteome in Elsholtzia splendens Roots Using ITRAQ with LC–ESI–MS/MS. Appl Biochem Biotechnol 176, 1174–1194 (2015). https://doi.org/10.1007/s12010-015-1638-7
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DOI: https://doi.org/10.1007/s12010-015-1638-7