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Rahman MZ, Tsujimori Y, Maeda M, Hossain MA, Ishimizu T, Kimura Y. Molecular characterization of second tomato α1,3/4-fucosidase (α-Fuc'ase Sl-2), a member of glycosyl hydrolase family 29 active toward the core α1,3-fucosyl residue in plant N-glycans. J Biochem 2018; 164:53-63. [PMID: 29444271 DOI: 10.1093/jb/mvy029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Accepted: 02/04/2018] [Indexed: 01/07/2023] Open
Abstract
In a previous study, we molecular-characterized a tomato (Solanum lycopersicum) α1, 3/4-fucosidase (α-Fuc'ase Sl-1) encoded in a tomato gene (Solyc03g006980), indicating that α-Fuc'ase Sl-1 is involved in the turnover of Lea epitope-containing N-glycans. In this study, we have characterized another tomato gene (Solyc11g069010) encoding α1, 3/4-fucosidase (α-Fuc'ase Sl-2), which is also active toward the complex type N-glycans containing Lea epitope(s). The baculovirus-insect cell expression system was used to express that α-Fuc'ase Sl-2 with anti-FLAG tag, and the expression product (rFuc'ase Sl-2), was found as a 65 kDa protein using SDS-PAGE and has an optimum pH of around 5.0. Similarly to rFuc'ase Sl-1, rFuc'ase Sl-2 hydrolyzed the non-reducing terminal α1, 3-fucose residue on LNFP III and α1, 4-fucose residues of Lea epitopes on plant complex type N-glycans, but not the core α1, 3-fucose residue on Manβ1-4GlcNAcβ1-4(Fucα1-3)GlcNAc or Fucα1-3GlcNAc. However, we found that both α-Fuc'ases Sl-1 and Sl-2 were specifically active toward α1, 3-fucose residue on GlcNAcβ1-4(Fucα1-3)GlcNAc, indicating that the non-substituted β-GlcNAc linked to the proximal GlcNAc residue of the core tri-saccharide moiety of plant specific N-glycans must be a pre-requisite for α-Fuc'ase activity. A 3 D modelled structure of the catalytic sites of α-Fuc'ase Sl-2 suggested that Asp192 and Glu236 may be important for binding to the α1, 3/4 fucose residue.
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Affiliation(s)
- Md Ziaur Rahman
- Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan.,Institute of Food and Radiation Biology, Atomic Energy Research Establishment, Bangladesh Atomic Energy Commission, Ganakbari, Savar, Dhaka 1340, Bangladesh
| | - Yuta Tsujimori
- Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan
| | - Megumi Maeda
- Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan
| | - Md Anowar Hossain
- Department of Biochemistry and Molecular Biology, University of Rajshahi, Rajshahi 6205, Bangladesh
| | - Takeshi Ishimizu
- College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Yoshinobu Kimura
- Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan
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Maeda M, Kimura Y. Glycoform analysis of N-glycans linked to glycoproteins expressed in rice culture cells: predominant occurrence of complex type N-glycans. Biosci Biotechnol Biochem 2006; 70:1356-63. [PMID: 16794314 DOI: 10.1271/bbb.50637] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Although it has been found that plant endo-beta-N-acetylglucosaminidase shows strong activity towards denatured glycoproteins and glycopeptides with high-mannose type N-glycans and free high-mannose type N-glycans bearing the chitobiosyl unit, the endogenous substrates for plant endoglycosidase have not yet been identified. Recently we purified and characterized an endo-beta-N-acetylglucosaminidase from rice culture cells and identified the gene encoded. Furthermore, we found structural features of free N-glycans in the cells, indicating that high-mannose type species (Man(9-5)GlcNAc(1)) occur at concentration of several micromolar (microM). Hence, in this study we analyzed glycoform of N-glycans linked to glycoproteins expressed in rice culture cells to see whether endogenous glycoproteinous substrate occurs in reasonable amounts. Structural analysis revealed that more than 95% of total N-glycans linked to glycoproteins in the rice cells had the plant complex type structure, including Lewis a epitope-harboring type, although high-mannose type structures account for less than 5% of total N-glycans.
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Affiliation(s)
- Megumi Maeda
- Division of Bioscience, Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University
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Gossrau R. Catalytic histochemistry of acid and neutral hydrolases in plant seedlings. THE HISTOCHEMICAL JOURNAL 1991; 23:483-9. [PMID: 1743997 DOI: 10.1007/bf01041379] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In contrast to human and animal tissues, little information is available on the activity, distribution and functional role of acid and neutral hydrolases in plant cells and tissues. Because it is known that these enzymes are relatively active during germination, they were analysed histochemically during this process using light microscope azo, azoindoxyl, indigogenic and tetrazolium methods. Proteases, glucosidases and glucuronidases could not be detected. Non-specific acid phosphatases were species-independent and showed considerable activities in aleuron and nutritional cells, in other cell types of cotyledon or endosperm tissue and in different types of embryonic cells. Acid glycosidases and non-specific esterases, in contrast, displayed a species-dependent activity and differences in localization. Of the glycosidases, alpha-D-galactosidase was the most active. Non-specific esterases, acid phosphatase and glucosaminidase were also present in the extracellular matrix. During germination, acid hydrolase activity either decreased or increased, depending on the seedling species and enzyme.
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Affiliation(s)
- R Gossrau
- Department of Anatomy, Free University of Berlin, Germany
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