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Tang Z, Cai S, Liu Y, Li D, Xie F, Lin H, Chen D, Li Y. A Lipopolysaccharide O-Antigen Synthesis Gene in Mesorhizobium huakuii Plays Differentiated Roles in Root Nodule Symbiotic Compatibility with Astragalus sinicus. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2023; 36:623-635. [PMID: 37366577 DOI: 10.1094/mpmi-05-23-0066-r] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Lipopolysaccharide (LPS) is a ubiquitous microbial-associated molecular pattern. Plants can sense the three components of LPS, including core polysaccharide, lipid A, and O-antigen. LPS biosynthesis is an essential factor for the successful establishment of symbiosis in the rhizobium-legume plant system. The MCHK_1752 gene (Mesorhizobium huakuii 7653R gene) encodes O-antigen polymerase and affects the synthesis of O-antigen. Here, we investigated the symbiotic phenotypes of six Astragalus sinicus accessions inoculated with the MCHK_1752 deletion mutant strain. The results revealed that the MCHK_1752 deletion mutant strain had a suppressing effect on the symbiotic nitrogen fixation of two A. sinicus accessions, a promoting effect in three A. sinicus accessions, and no significant effect in one A. sinicus accessions. In addition, the effect of MCHK_1752 on the phenotype was confirmed by its complementary strains and LPS exogenous application. Deletion of MCHK_1752 showed no effect on the growth of a strain, but affected biofilm formation and led to higher susceptibility to stress in a strain. At the early symbiotic stage, Xinzi formed more infection threads and nodule primordia than Shengzhong under inoculation with the mutant, which might be an important reason for the final symbiotic phenotype. A comparison of early transcriptome data between Xinzi and Shengzhong also confirmed the phenotype at the early symbiotic stage. Our results suggest that O-antigen synthesis genes influence symbiotic compatibility during symbiotic nitrogen fixation. [Formula: see text] Copyright © 2023 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Zhide Tang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Shuyun Cai
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Yuan Liu
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Dongzhi Li
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Fuli Xie
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Hui Lin
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Dasong Chen
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Youguo Li
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
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Peng T, Wooke Z, Pohl NLB. Scope and limitations of carbohydrate hydrolysis for de novo glycan sequencing using a hydrogen peroxide/metallopeptide-based glycosidase mimetic. Carbohydr Res 2018; 458-459:85-88. [PMID: 29475194 DOI: 10.1016/j.carres.2018.01.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 01/10/2018] [Accepted: 01/29/2018] [Indexed: 12/13/2022]
Abstract
Acidic hydrolysis is commonly used as a first step to break down oligo- and polysaccharides into monosaccharide units for structural analysis. While easy to set up and amenable to mass spectrometry detection, acid hydrolysis is not without its drawbacks. For example, ring-destruction side reactions and degradation products, along with difficulties in optimizing conditions from analyte to analyte, greatly limits its broad utility. Herein we report studies on a hydrogen peroxide/CuGGH metallopeptide-based glycosidase mimetic design for a more efficient and controllable carbohydrate hydrolysis. A library of methyl glycosides consisting of ten common monosaccharide substrates, along with oligosaccharide substrates, was screened with the artificial glycosidase for hydrolytic activity in a high-throughput format with a robotic liquid handling system. The artificial glycosidase was found to be active towards most screened linkages, including alpha- and beta-anomers, thus serving as a potential alternative method for traditional acidic hydrolysis approaches of oligosaccharides.
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Affiliation(s)
- Tianyuan Peng
- Department of Chemistry, Indiana University, Bloomington, IN, USA
| | - Zachary Wooke
- Department of Chemistry, Indiana University, Bloomington, IN, USA
| | - Nicola L B Pohl
- Department of Chemistry, Indiana University, Bloomington, IN, USA; Radcliffe Institute of Advanced Study, Harvard University, Cambridge, MA, USA.
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