Expression, purification, and in vitro characterization of kinase domain of NtGCN2 from tobacco

• Published in: Protein expression and purification 2019-11, Vol.163, p.105452-105452, Article 105452
• Main Authors: Hao, Yingchen, Yang, Yongxia, Zhang, Songjie, Li, Yibo, Zhai, Chunhe, Long, Yue, Jia, Hongfang, Zhang, Songtao
• Format: Article
• Language: English
• Subjects: Antibodies - immunology; Cloning, Molecular; Enzyme-Linked Immunosorbent Assay; Escherichia coli; Eukaryotic Initiation Factor-2 - metabolism; GCN2; Genetic Vectors; In vitro; Kinase; Nicotiana - enzymology; Phosphorylation; Prokaryotic expression; Protein Domains; Protein purification; Protein Serine-Threonine Kinases - chemistry; Protein Serine-Threonine Kinases - genetics; Protein Serine-Threonine Kinases - immunology; Protein Serine-Threonine Kinases - isolation & purification; Recombinant Proteins - genetics; Recombinant Proteins - isolation & purification; Recombinant Proteins - metabolism
• ISSN: 1046-5928; 1096-0279
• DOI: 10.1016/j.pep.2019.105452

General control nonderepressible 2 (GCN2) can phosphorylate the α subunit of eukaryotic initiation factor eIF2 (eukaryotic translation initiation factor 2) to down-regulateprotein synthesis in response to various biotic and abiotic stresses. However, the kinase activity of plant GCN2 has not been well-characterized in vitro. In this study, the kinase domain of Nicotiana tabacum GCN2 (NtGCN2) was inserted into the pET15b vector for prokaryotic expressionin Escherichia coli BL21-CodonPlus-(DE3)-RIPL after induction by 0.5 mmol L−1 IPTG for 13 h at 16 °C. The soluble protein was collected and purified by Ni2+-NTA agarose column, anion exchange, and molecular sieve, and the purified proteinwas used for kinase assays and the preparation of a polyclonal antibody. Enzyme-linked immunosorbent assay results showed that the titer of the antiserum was 1:520K. Western blot analysis showed that the prepared antibody reacted with GCN2 in tobacco. Additionally, the kinase activity of NtGCN2 was characterized by using recombinant NteIF2α protein as a substrate in vitro. The results showed that NtGCN2 phosphorylated NteIF2α in vitro, with the level of phosphorylation positively correlated with the NtGCN2 concentration and reaction time. Our study has prepared a specific antibody, and proves NtGCN2 can phosphorylate NteIF2α in vitro, which lays a foundation for further study of the function and interaction network of NtGCN2. •Kinase activity of plant GCN2 has not been well-characterized in vitro.•Western blot analysis showed prepared antibody reacted with GCN2 in tobacco.•NtGCN2 phosphorylated NteIF2α in vitro.•Phosphorylation level positively correlated with NtGCN2 concentration, reaction time.