Abstract
For chemo-enzymatic synthesis of a glycosylated peptide, 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM) was used for the synthesis of a N-acetylglucosaminyl peptide and a pseudoglycopeptide by solid-phase peptide synthesis without the requirement of protecting groups on the carbohydrate. We also performed transglycosylation of an N-glycan to the N-acetylglucosaminyl peptide using endo-β-N-acetylglucosaminidase from Mucor hiemalis (Endo-M) to synthesize a glycopeptide containing a complex N-glycan.
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Notes
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by McNaught, A. D. and Wilkinson, A. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by Nic, M., Jirat, J., Kosata, B.: updates compiled by Jenkins, A. ISBN 0–9678550–9-8.
A large variance in the methionine residue was observed. Antioxidant was not added to the reaction mixture during the hydrolysis of the peptides, therefore leading to partial oxidation of methionine to methionine sulfoxide.
The biological assay was entrusted to Anti Viral Screening System Co. ltd. (AVSS).
Abbreviations
- Boc:
-
Tert-butoxycarbonyl
- tBu:
-
Tert-butyl
- DIEA:
-
N,N′-diisopropylethylamine
- DMT-MM:
-
4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride
- EDT:
-
Ethanedithiol
- Endo-M:
-
Endo-β-N-acetylglucosaminidase from Mucor hiemalis
- ENGase:
-
Endo-β-N-acetylglucosaminidase
- ESI:
-
Electrospray ionization
- Fmoc:
-
9-fluorenylmethoxycarbonyl
- Gal:
-
Galactose
- GlcNAc:
-
N-acetylglucosamine
- HIV:
-
Human immunodeficiency virus
- HRMS:
-
High-resolution mass spectrometry
- IC50 :
-
Half maximal inhibitory concentration
- LCMS–IT–TOF:
-
Liquid chromatography/mass spectrometry-ion trap-time-of-flight
- Man:
-
Mannose
- NeuAc:
-
N-acetylneuraminic acid
- NMP:
-
1-methyl-2-pyrrolidinone
- RP-HPLC:
-
Reversed-phase high-performance liquid chromatography
- SGP:
-
Sialylglycopeptide
- SG-oxazoline:
-
Sialylglyco-oxazoline
- SPPS:
-
Solid phase peptide synthesis
- TMSOTf:
-
Trifluoromethanesulfonic acid trimethylsilyl ester
- TFA:
-
Trifluoroacetic acid
- TfOH:
-
Trifluoromethanesulfonic acid
- Trt:
-
Trityl
- TIS:
-
Triisopropylsilane
- VIRIP:
-
Virus-inhibitory peptide
- WST:
-
Water soluble tetrazolium salts
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Acknowledgments
The authors acknowledge Drs. Yoshimi and Osamu Kanie at Tokai University for their assistance in high-resolution mass spectrometry. We thank associate professor Hidekazu Katayama (Tokai University) for his help with running the amino acid analysis and Tokyo Chemical Industry Co., Ltd., (TCI) for kindly providing the Endo-M N175Q enzyme and SG-oxazoline. We also thank Daiki Katou (Kanazawa University) and Rina Akashi (Tokai University) for their support. A part of this work was conducted in JAIST, supported by the Nanotechnology Platform Program (Molecule and Material Synthesis) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
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Tomabechi, Y., Katoh, T., Kunishima, M. et al. Chemo-enzymatic synthesis of a glycosylated peptide containing a complex N-glycan based on unprotected oligosaccharides by using DMT-MM and Endo-M. Glycoconj J 34, 481–487 (2017). https://doi.org/10.1007/s10719-017-9770-y
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DOI: https://doi.org/10.1007/s10719-017-9770-y