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A conserved asparagine residue in the inner surface of BRI1 superhelix is essential for protein native conformation. Biochem Biophys Res Commun 2022; 615:49-55. [DOI: 10.1016/j.bbrc.2022.05.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 05/04/2022] [Indexed: 11/19/2022]
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Yoo JY, Ko KS, Vu BN, Lee YE, Yoon SH, Pham TT, Kim JY, Lim JM, Kang YJ, Hong JC, Lee KO. N-acetylglucosaminyltransferase II Is Involved in Plant Growth and Development Under Stress Conditions. FRONTIERS IN PLANT SCIENCE 2021; 12:761064. [PMID: 34804097 PMCID: PMC8596550 DOI: 10.3389/fpls.2021.761064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 10/12/2021] [Indexed: 05/04/2023]
Abstract
Alpha-1,6-mannosyl-glycoprotein 2-β-N-acetylglucosaminyltransferase [EC 2.4.1.143, N-acetylglucosaminyltransferase II (GnTII)] catalyzes the transfer of N-acetylglucosamine (GlcNAc) residue from the nucleotide sugar donor UDP-GlcNAc to the α1,6-mannose residue of the di-antennary N-glycan acceptor GlcNAc(Xyl)Man3(Fuc)GlcNAc2 in the Golgi apparatus. Although the formation of the GlcNAc2(Xyl)Man3(Fuc)GlcNAc2 N-glycan is known to be associated with GnTII activity in Arabidopsis thaliana, its physiological significance is still not fully understood in plants. To address the physiological importance of the GlcNAc2(Xyl)Man3(Fuc)GlcNAc2 N-glycan, we examined the phenotypic effects of loss-of-function mutations in GnTII in the presence and absence of stress, and responsiveness to phytohormones. Prolonged stress induced by tunicamycin (TM) or sodium chloride (NaCl) treatment increased GnTII expression in wild-type Arabidopsis (ecotype Col-0) but caused severe developmental damage in GnTII loss-of-function mutants (gnt2-1 and gnt2-2). The absence of the 6-arm GlcNAc residue in the N-glycans in gnt2-1 facilitated the TM-induced unfolded protein response, accelerated dark-induced leaf senescence, and reduced cytokinin signaling, as well as susceptibility to cytokinin-induced root growth inhibition. Furthermore, gnt2-1 and gnt2-2 seedlings exhibited enhanced N-1-naphthylphthalamic acid-induced inhibition of tropic growth and development. Thus, GnTII's promotion of the 6-arm GlcNAc addition to N-glycans is important for plant growth and development under stress conditions, possibly via affecting glycoprotein folding and/or distribution.
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Affiliation(s)
- Jae Yong Yoo
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
| | - Ki Seong Ko
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
| | - Bich Ngoc Vu
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
- Division of Applied Life Sciences (BK4 Program), Jinju, South Korea
| | - Young Eun Lee
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
- Division of Applied Life Sciences (BK4 Program), Jinju, South Korea
| | - Seok Han Yoon
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
- Division of Applied Life Sciences (BK4 Program), Jinju, South Korea
| | - Thao Thi Pham
- Department of Chemistry, Changwon National University, Changwon, South Korea
| | - Ji-Yeon Kim
- Department of Chemistry, Changwon National University, Changwon, South Korea
| | - Jae-Min Lim
- Department of Chemistry, Changwon National University, Changwon, South Korea
| | - Yang Jae Kang
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
- Division of Life Science, Jinju, South Korea
- Division of Bio & Medical Bigdata (BK4 Program), Gyeongsang National University, Jinju, South Korea
| | - Jong Chan Hong
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
- Division of Applied Life Sciences (BK4 Program), Jinju, South Korea
- Division of Life Science, Jinju, South Korea
| | - Kyun Oh Lee
- Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Jinju, South Korea
- Division of Applied Life Sciences (BK4 Program), Jinju, South Korea
- Division of Life Science, Jinju, South Korea
- *Correspondence: Kyun Oh Lee,
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