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Xiang MH, Lu TT, Gao XD, Wang N. Efficient production and characterization of soluble active human β-1,2-N-acetylglucosaminyltransferase II in bacteria. J Biosci Bioeng 2023; 136:166-172. [PMID: 37393188 DOI: 10.1016/j.jbiosc.2023.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 05/29/2023] [Accepted: 06/12/2023] [Indexed: 07/03/2023]
Abstract
In humans, almost all the cell surface and secreted glycoproteins are modified with complex-type N-glycans. Thus, it is essential to obtain complex-type N-glycans to fully understand the biological properties of glycoproteins. Here, human β-1,2-N-acetylglucosaminyltransferase II (hGnT-II), a Golgi-localized enzyme integral to complex-type N-glycan biosynthesis, was cloned as a truncated transmembrane form (GnT-II-ΔTM) and heterologously overexpressed in Escherichia coli. Our results showed that hGnT-II could be overexpressed in its soluble form by fusing the truncated enzyme with a thioredoxin (Trx)-tag in the Rosetta-Gami 2 strain. Using the optimized induction conditions, the expression level of recombinant protein was enhanced to yield approximately 4 mg per liter culture after affinity purification. The enzyme exhibited appropriate glycosyltransferase activity, and the calculated Km value was 52.4 μM, similar to the protein expressed in mammalian cells. Furthermore, the effect of MGAT2-CDG mutations on enzyme activity was also measured. These results suggested that the E. coli expression system was capable of the large-scale production of bioactive hGnT-II, which can be used for functional study and effective synthesis of complex-type N-glycans.
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Affiliation(s)
- Meng-Hai Xiang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Tian-Tian Lu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Xiao-Dong Gao
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Ning Wang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
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2
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Jiang R, Zong G, Liang X, Jin S, Zhang J, Wang D. Direct 2,3-O-isopropylidenation of α-D-mannopyranosides and the preparation of 3,6-branched mannose trisaccharides. Molecules 2014; 19:6683-93. [PMID: 24858100 PMCID: PMC6270901 DOI: 10.3390/molecules19056683] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 05/09/2014] [Accepted: 05/19/2014] [Indexed: 11/16/2022] Open
Abstract
A highly efficient, regioselective method for the direct 2,3-O-isopropylidenation of α-D-mannopyranosides is reported. Treatment of various α-D-mannopyranosides with 0.12 equiv of the TsOH·H2O and 2-methoxypropene at 70 °C gave 2,3-O-isopropylidene-α-D-mannopyranosides directly in 80%~90% yields. Based on this method, a 3,6-branched α-D-mannosyl trisaccharide was prepared in 50.4% total yield using p-nitrophenyl 2,3-O-isopropylidene-α-D-mannopyranoside as the starting material.
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Affiliation(s)
- Rui Jiang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Guanghui Zong
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Xiaomei Liang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Shuhui Jin
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Jianjun Zhang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China.
| | - Daoquan Wang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
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3
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Lin CC, Hsu TS, Lu KC, Huang IT. Synthesis of β-D-Glucopyranosyl(1→3)-1-thiol-β-glucosamine Disaccharide Derivative as Building Block for the Synthesis of Hyaluronic Acid. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200000125] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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4
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Chemical transformations employing glycosyltransferases. Top Curr Chem (Cham) 2008. [DOI: 10.1007/bfb0119218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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5
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A New Strategy for Oligosaccharide Assembly Exploiting Cyclohexane-1,2-diacetal Methodology: An Efficient Synthesis of a High Mannose Type Nonasaccharide. Chemistry 2006. [DOI: 10.1002/chem.19970030315] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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6
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López JC, Agocs A, Uriel C, Gómez AM, Fraser-Reid B. Iterative, orthogonal strategy for oligosaccharide synthesis based on the regioselective glycosylation of polyol acceptors with partially unprotected n-pentenyl-orthoesters: further evidence for reciprocal donor acceptor selectivity (RDAS). Chem Commun (Camb) 2005:5088-90. [PMID: 16220180 DOI: 10.1039/b507468a] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient iterative, orthogonal protocol based on the regioselective glycosyl coupling of D-mannose polyols with, partially unprotected, n-pentenyl orthoester donors permits the synthesis of linear and branched oligosaccharides with minimal protecting group tampering.
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Affiliation(s)
- J Cristóbal López
- Instituto de Química Orgánica General, CSIC, Juan de la Cierva 3, 28006, Madrid, Spain.
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7
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Schachter H, Reck F, Paulsen H. Use of synthetic oligosaccharide substrate analogs to map the active sites of N-acetylglucosaminyltransferases I and II. Methods Enzymol 2003; 363:459-75. [PMID: 14579596 DOI: 10.1016/s0076-6879(03)01072-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
Tables III and IV summarize substrate analog data presented in Tables I and II, respectively. Data for GlcNAc-T I shown in Tables I and III correlate very well with the crystal structure for GlcNAc-T I. This indicates that substitution of the various hydroxyl groups by hydrogen, [table: see text] O-methyl, and maybe even larger O-alkyl groups does not cause appreciable changes to either the overall conformation of the oligosaccharide or the binding mode, thus supporting this approach of chemical modification of oligosaccharide substrates for mapping of the binding site. There is as yet no crystal structure for GlcNAc-T II. These studies indicate both advantages and disadvantages of this approach for elucidating the catalytic and binding sites of an enzyme. Substrate analog data indicate which chemical groups in the substrate are essential for catalysis and binding and suggest the type of linkage involved (hydrogen bond donor or acceptor). However, no information has been obtained on the protein groups involved in these interactions. If a crystal structure is available, the substrate analog conclusions are primarily confirmatory. However, whether or not a crystal structure is available, this approach can be very helpful in the design of specific inhibitors.
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Affiliation(s)
- Harry Schachter
- Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G IX8, Canada
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8
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Koeller KM, Wong CH. Synthesis of complex carbohydrates and glycoconjugates: enzyme-based and programmable one-pot strategies. Chem Rev 2000; 100:4465-94. [PMID: 11749355 DOI: 10.1021/cr990297n] [Citation(s) in RCA: 347] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K M Koeller
- Department of Chemistry, The Scripps Research Institute and Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, La Jolla, California 92037
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9
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McGarvey GJ, Wong CH. Chemical, Enzymatic and Structural Studies in Molecular Glycobiology. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jlac.199719970604] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Reck F, Springer M, Meinjohanns E, Paulsen H, Brockhausen I, Schachter H. Synthetic substrate analogues for UDP-GlcNAc: Man alpha 1-3R beta 1-2-N-acetylglucosaminyltransferase I. Substrate specificity and inhibitors for the enzyme. Glycoconj J 1995; 12:747-54. [PMID: 8748150 DOI: 10.1007/bf00731234] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
UDP-GlcNAc:Man alpha 1-3R beta 1-2-N-acetylglucosaminyltransferase I (GlcNAc-T I; EC 2.4.1.101) catalyses the conversion of [Man alpha 1-6(Man alpha 1-3)Man alpha 1-6][Man alpha 1-3]Man beta-O-R to [Man alpha 1-6(Man alpha 1-3)Man alpha 1-6] [GlcNAc beta 1-2Man alpha 1-3]Man beta-O-R (R = 1-4GlcNAc beta 1-4GlcNAc- Asn-X) and thereby controls the conversion of oligomannose to complex and hybrid asparagine-linked glycans (N-glycans). GlcNAc-T I also catalyses the conversion of Man alpha 1-6(Man alpha 1-3)Man beta-O-octyl to Man alpha 1-6(GlcNAc beta 1-2Man alpha 1-3)Man beta-O-octyl. We have therefore tested a series of synthetic analogues of Man"alpha 1-6(Man'alpha 1-3)Man beta-O-octyl as substrates and inhibitors for rat liver GlcNAc-T I. The 2"-deoxy and the 3"-, 4"- and 6"-O-methyl derivatives are all good substrates confirming previous observations that the hydroxyl groups of the Man"alpha 1-6 residue do not play major roles in the binding of substrate to enzyme. In contrasts, all four hydroxyl groups on the Man'alpha 1-3 residue are essential since the corresponding deoxy derivatives either do not bind (2'- and 3'-deoxy) or bind very poorly (4'- and 6'-deoxy) to the enzyme. The 2'- and 3'-O-methyl derivatives also do not bind to the enzyme. However, the 4'-O-methyl derivative is a substrate (KM = 2.6 mM) and the 6'-O-methyl compound is a competitive inhibitor (Ki = 0.76 mM). We have therefore synthesized various 4'- and 6'-O-alkyl derivatives, some with reactive groups attached to an O-pentyl spacer, and tested these compounds as reversible and irreversible inhibitors of GlcNAc-T I. The 6'-O-(5-iodoacetamido-pentyl) compound is a specific time dependent inhibitor of the enzyme. Four other 6'-O-alkyl compounds showed competitive inhibition while the remaining compounds showed little or no binding indicating that the electronic properties of the attached O-pentyl groups influence binding.
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Affiliation(s)
- F Reck
- Research Institute, Hospital for Sick Children, Toronto, Ont, Canada
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11
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Reck F, Meinjohanns E, Tan J, Grey AA, Paulsen H, Schachter H. Synthesis of pentasaccharide analogues of the N-glycan substrates of N-acetylglucosaminyltransferases III, IV and V using tetrasaccharide precursors and recombinant beta-(1-->2)-N-acetylglucosaminyltransferase II. Carbohydr Res 1995; 275:221-9. [PMID: 8529222 DOI: 10.1016/0008-6215(95)00091-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Recombinant human UDP-GlcNAc: alpha-Man-(1-->6)R beta-(1-->2)-N-acetylglucosaminyltransferase II (EC 2.4.1.143, GlcNAc-T II) was produced in the Sf9 insect cell/baculovirus expression system as a fusion protein with a (His)6 tag and partially purified by affinity chromatography on a metal chelating column. The partially purified enzyme was used to catalyze the transfer of GlcNAc from UDP-GlcNAc to R-alpha-Man(1-->6)(beta-GlcNAc(1-->2)alpha-Man(1-->3))beta-Man-O-octyl to form beta-GlcNAc(1-->2)R-alpha-Man(1-->6)(beta-GlcNAc(1-->2)alpha- Man(1-->3))beta-Man-O-octyl where there is either no modification of the alpha-Man(1-->6) residue (7), or where R is 3-deoxy (8), 4-deoxy (9) or 6-deoxy (10). The yields ranged from 64-80%. Products were characterized by 1H and 13C nuclear magnetic resonance spectroscopy and fast atom bombardment mass spectrometry. Compounds 7-10 are pentasaccharide analogues of the biantennary N-glycan substrates of N-acetylglucosaminyltransferases III, IV and V.
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Affiliation(s)
- F Reck
- Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
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12
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Paulsen H, Springer M, Reck F, Brockhausen I, Schachter H. [Synthesis of modified tetrasaccharides as analog acceptor-inhibitors of N-acetylglucosaminyltransferase II]. Carbohydr Res 1995; 275:403-11. [PMID: 8529232 DOI: 10.1016/0008-6215(95)00056-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- H Paulsen
- Institut für Organische Chemie der Universität Hamburg, Deutschland
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13
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Wong CH, Halcomb RL, Ichikawa Y, Kajimoto T. Enzyme in der organischen Synthese: das Problem der molekularen Erkennung von Kohlenhydraten (Teil 2). Angew Chem Int Ed Engl 1995. [DOI: 10.1002/ange.19951070505] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Chapter 5 Biosynthesis 2c. Glycosyltransferases Involved in the Synthesis of N-Glycan Antennae. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/s0167-7306(08)60592-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2023]
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15
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Paulsen H, Springer M, Reck F, Meinjohanns E, Brockhausen I, Schachter H. Bausteine von Oligosacchariden, CIX. Synthese von modifizierten Oligosacchariden derN-Glycoproteine zur Untersuchung der Substratspezifität derN-Acetylglucosaminyltransferase I. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/jlac.199519950109] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Khan SH, Compston CA, Palcic MM, Hindsgaul O. Synthesis of a di-O-methylated pentasaccharide for use in the assay of N-acetylglucosaminyltransferase III activity. Carbohydr Res 1994; 262:283-95. [PMID: 7982220 DOI: 10.1016/0008-6215(94)84185-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The biantennary oligosaccharide analogue beta-D-Glc pNAc-(1-->2)-alpha-D-Man p-(1-->3)-[beta-D-Glc pNAc-(1-->2)-alpha- D-Man p-(1-->6)]-beta-D-man p-O(CH2)8COOMe (3) is a potential substrate for N-acetylglucosaminyltransferases (GlcNAcTs) III-V which are present in mammalian cells. The di-O-methylated analogue of 3, beta-D-Glc pNAc-(1-->2)-[4-O-methyl-alpha-D-Man p]-(1-->3)-[beta-D-Glc pNAc-(1-->2)-[6-O-methyl-alpha-D-Man p]-(1-->6)]-beta-D-Man p-O-(CH2)8COOMe (5), was prepared by a block synthesis approach involving sequential addition of two O-methylated disaccharide donors to a protected central beta-D-Man residue. The OH groups acted on by GlcNAcT-IV and -V are protected from glycosylation in 5 since they are present as their methyl ethers. Pentasaccharide 5 was found to be an excellent substrate for GlcNAcT-III (EC 2.4.1.144) from rat kidney with Km = 0.15 mM. The product formed by incubation of 5 with a rat kidney extract, in the presence of UDP-GlcNAc, was isolated, structurally characterized by NMR spectroscopy and confirmed to be the expected di-O-methyl hexasaccharide where a beta-D-Glc pNAc residue had been added to OH-4 of the central beta-D-Man p unit.
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Affiliation(s)
- S H Khan
- Department of Chemistry, University of Alberta, Edmonton, Canada
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17
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Alton G, Srivastava G, Kaur KJ, Hindsgaul O. Use of N-acetylglucosaminyltransferases I and II in the synthesis of a dideoxypentasaccharide. Bioorg Med Chem 1994; 2:675-80. [PMID: 7858975 DOI: 10.1016/0968-0896(94)85017-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- G Alton
- Department of Chemistry, University of Alberta, Edmonton, Canada
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18
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Reck F, Springer M, Paulsen H, Brockhausen I, Sarkar M, Schachter H. Synthesis of tetrasaccharide analogues of the N-glycan substrate of beta-(1-->2)-N-acetylglucosaminyltransferase II using trisaccharide precursors and recombinant beta-(1-->2)-N-acetylglucosaminyltransferase I. Carbohydr Res 1994; 259:93-101. [PMID: 8039192 DOI: 10.1016/0008-6215(94)84200-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Recombinant rabbit UDP-GlcNAc: alpha-Man-(1-->3R) beta-(1-->2)-N-acetylglucosaminyl-transferase I (EC 2.4.1.101, GlcNAc-T I) produced in the Sf9 insect cell/baculovirus expression system has been used to convert compounds of the form 3-R-alpha-Man(1-->6)(alpha-Man(1-->3)) beta-Man-O-octyl to 3-R-alpha-Man(1-->6)(beta-GlcNAc(1-->2)alpha-Man(1-->3)) beta-Man-O-octyl where R is OH (14), O-methyl (17), O-pentyl (18), O-(4,4-azo)pentyl (19), O-(5-iodoacetamido)pentyl (20) and O-(5-amino)pentyl (21); 2-deoxy-alpha-Man(1-->6)(beta-GlcNAc(1-->2) alpha-Man(1-->3)) beta-Man-O-octyl (16), 4-O-methyl-alpha-Man(1-->6) (beta-GlcNAc(1-->2) alpha-Man(1-->3)) beta-Man-O-octyl (22), 6-O-methyl-alpha-Man(1-->6)(beta-GlcNAc(1-->2) alpha Man(1-->3)) beta-Man-O-octyl (23) and alpha-Man(1-->6)[beta-GlcNAc(1-->2)(4-O-methyl) alpha-Man(1-->3)] beta-Man-O-octyl (15) were also synthesized by this procedure. The yields ranged from 80 to 99%. Products were characterized by high resolution 1H and 13C nuclear magnetic resonance spectroscopy and fast atom bombardment mass spectrometry. Compounds 14, 15, 17, 22, and 23 are excellent substrates for UDP-GlcNAc: alpha-Man(1-->6R) beta-(1-->2)-N-acetylglucosaminyltransferase II and the other compounds are inhibitors of this enzyme.
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Affiliation(s)
- F Reck
- Research Institute, Hospital for Sick Children, Toronto, ON, Canada
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19
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Reck F, Meinjohanns E, Springer M, Wilkens R, Van Dorst JA, Paulsen H, Möller G, Brockhausen I, Schachter H. Synthetic substrate analogues for UDP-GlcNAc: Man alpha 1-6R beta(1-2)-N-acetylglucosaminyltransferase II. Substrate specificity and inhibitors for the enzyme. Glycoconj J 1994; 11:210-6. [PMID: 7841796 DOI: 10.1007/bf00731220] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
UDP-GlcNAc:Man alpha 1-6R beta(1-2)-N-acetylglucosaminyltransferase II (GlcNAc-T II; EC 2.4.1.143) is a key enzyme in the synthesis of complex N-glycans. We have tested a series of synthetic analogues of the substrate Man"'alpha 1-6(GlcNAc"beta 1-2Man'alpha 1-3)Man beta-O-octyl as substrates and inhibitors for rat liver GlcNAc-T II. The enzyme attaches N-acetylglucosamine in beta 1-2 linkage to the 2"'-OH of the Man"'alpha 1-6 residue. The 2"'-deoxy analogue is a competitive inhibitor (Ki = 0.13 mM). The 2"'-O-methyl compound does not bind to the enzyme presumably due to steric hindrance. The 3"'-, 4"'- and 6"'-OH groups are not essential for binding or catalysis since the 3"'-, 4"'- and 6"'-deoxy and -O-methyl derivatives are all good substrates. Increasing the size of the substituent at the 3"'-position to pentyl and substituted pentyl groups causes competitive inhibition (Ki = 1.0-2.5 mM). We have taken advantage of this effect to synthesize two potentially irreversible GlcNAc-T II inhibitors containing a photolabile 3"'-O-(4,4-azo)pentyl group and a 3"'-O-(5-iodoacetamido)pentyl group respectively. The data indicate that none of the hydroxyls of the Man"'alpha 1-6 residue are essential for binding although the 2"'- and 3"'-OH face the catalytic site of the enzyme. The 4-OH group of the Man beta-O-octyl residue is not essential for binding or catalysis since the 4-deoxy derivative is a good substrate; the 4-O-methyl derivative does not bind.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- F Reck
- Research Institute, Hospital for Sick Children, Toronto, Ont., Canada
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20
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Sarkar M. Expression of recombinant rabbit UDP-GlcNAc: alpha 3-D-mannoside beta-1,2-N-acetylglucosaminyltransferase I catalytic domain in Sf9 insect cells. Glycoconj J 1994; 11:204-9. [PMID: 7841795 DOI: 10.1007/bf00731219] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
UDP-GlcNAc: alpha 3-D-mannoside beta-1,2-N-acetylglucosaminyltransferase I (GnT I; EC 2.4.1.101) catalyses a key reaction in the conversion of oligomannose to complex and hybrid N-glycans. The cytoplasmic tail and transmembrane segment of rabbit GnT I cDNA were replaced with an in-frame cleavable signal sequence and the hybrid construct was inserted into the genome of Autographa californica nuclear polyhedrosis virus (AcMNPV) under the control of the polyhedrin promoter. Sf9 insect cells were infected with the recombinant baculovirus and the enzymatically active and soluble catalytic domain of GnT I was purified from the medium (1-5 mg l-1) in two steps to a specific activity of about 2 mumol min-1 mg-1 protein. Recombinant GnT I has been used for the chemical-enzymatic synthesis of analogues of Man alpha 1-6]GlcNAc beta 1-2Man alpha 1-3]Man beta-O-octyl.
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Affiliation(s)
- M Sarkar
- Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
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21
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Affiliation(s)
- M M Palcic
- Department of Chemistry, University of Alberta, Edmonton, Canada
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22
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Paulsen H, Meinjohanns E, Reck F, Brockhausen I. Bausteine von Oligosacchariden, CVIII. Synthese von modifizierten Oligosacchariden derN-Glycoproteine zur Untersuchung der Substratspezifitäten derN-Acetylglucosaminyltransferasen III bis VI. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/jlac.1993199301119] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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23
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Paulsen H, Meinjohanns E, Reck F, Brockhausen I. Bausteine von Oligosacchariden, CVII – Synthese von modifizierten Oligosacchariden derN-Glycoproteine zur Untersuchung der Substratspezifität derN-Acetylglucosaminyltransferase II. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/jlac.1993199301118] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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Paulsen H, Reck F, Brockhausen I. [Synthesis of modified oligosaccharides of the N-glycoprotein as substrate for N-acetylglucosaminyltransferase I]. Carbohydr Res 1992; 236:39-71. [PMID: 1291062 DOI: 10.1016/0008-6215(92)85006-l] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In the synthesis of modified derivatives of octyl O-(alpha-D-mannopyranosyl)-(1-->3)-O-[(alpha-D-mannopyranosyl)-(1-->6)]- beta-D-mannopyranoside, 4.,5-epoxypentyl, a 4-diazirinopentyl, and a 5-(iodoacetamido)pentyl group were attached to the 3''-OH of the trisaccharide. The diazirino derivative may be especially suitable for photolabeling of the active site of N-acetylglucosaminyltransferase I (GlcNAcT-I). In addition, the 2'-OH group of the above-mentioned trisaccharide was reduced to a 2'-deoxy group and substituted 2'-O-methyl group.
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Affiliation(s)
- H Paulsen
- Institut für Organische Chemie, Universität Hamburg, Deutschland
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Paulsen H, Meinjohanns E. Synthesis of modified oligosaccharides of N-Glycoproteins intended for substrate specificity studies of N-Acetylglucosaminyltransferases II-V. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)60178-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Paulsen H, van Dorst JALM, Reck F, Meinjohanns E. Bausteine von Oligosacchariden, CI. Synthese von modifizierten Oligosacchariden derN-Glycoproteine zur Untersuchung der Substratspezifität derN-Acetylglucosaminyltransferase II des Trimming-Prozesses. ACTA ACUST UNITED AC 1992. [DOI: 10.1002/jlac.199219920189] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kaur KJ, Hindsgaul O. Combined chemical-enzymic synthesis of a dideoxypentasaccharide for use in a study of the specificity of N-acetyl-glucosaminyltransferase-III. Carbohydr Res 1992; 226:219-31. [PMID: 1535553 DOI: 10.1016/0008-6215(92)84069-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The biantennary oligosaccharide glycoside beta-D-GlcpNAc-(1----2)-alpha-D- Manp-(1----3)- [beta-D-GlcpNAc-(1----2)-alpha-D-Manp-(1----6)]-beta-D-Manp- OR is a potential substrate for N-acetylglucosaminyltransferases (GlcNAcTs) III-V. The dideoxypentasaccharide glycoside beta-D-GlcpNAc-(1----2)-4- deoxy-alpha-D-lyxo-Hexp-(1----3)- [beta-DGlcpNAc-(1----2)-6-deoxy-alpha-D-Manp-(1----6)] beta-D-Manp-O(CH2)7CH3 (5), where the hydroxyl groups that would be acted on by GlcNAcTs IV and V have been removed, was prepared as a possible specific acceptor for GlcNAcT-III. The strategy involved the chemical synthesis of beta-D-GlcpNAc-(1----2)-4-deoxy-alpha-D-lyxo-Hexp-(1----3)-] 6- deoxy-alpha-D-Manp-(1----6)]-beta-D-Manp-O)CH2)7CH3 and then addition of the last GlcpNAc residue using partially purified GlcNAcT-II from rabbit liver. Preliminary results, using detergent extracts from rat kidney, indicate that 5 is an acceptor for a GlcNAcT whose identity remains to be established.
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Affiliation(s)
- K J Kaur
- Department of Chemistry, University of Alberta, Edmonton, Canada
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