Abstract
Prions are suspected as causative agents of several neuropathogenic diseases, even though the mode of their action is still not clear. A combination of chemical and recombinant syntheses can provide suitable probes for explanation of prions role in pathogenesis of neurodegenerative diseases. However, the prions contain several difficult sequences for synthesis by Fmoc/tBu approach. For that reason, the peptide thioesters as the key building blocks for chemical syntheses of proteins by native chemical ligation were employed. A scan of the mouse prion domain 93–231 was carried out in order to discover availability of derived thioesters as the suitable building blocks for a total chemical synthesis of the prion protein based probes. The synthesis on 2-chlorotritylchloride resin was utilized and after a deprotection of the samples for analysis, the peptide segments were purified and characterized. If the problems were detected during the synthesis, the segment was re-synthesized either using the special pseudoproline dipeptides or by splitting its molecule to two or three smaller segments, which were prepared easier. The protected segments, prepared correctly without any deletion and in sufficient amounts, were coupled either with EtSH after DIC/DMAP activation or with p-Ac-NH-Ph-SH using PyBOP activation to yield corresponding thioesters. In some special cases, the other techniques of thioester formation, like sulfonamide-safety catch and/or trimethylaluminium approach were utilized.
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Abbreviations
- AA:
-
Amino acid analysis
- ACN:
-
Acetonitrile
- Asi:
-
Aspartic acid imide
- Boc:
-
tert-Butoxycarbonyl
- ClTrt:
-
2-Chlorotrityl
- DIC:
-
N,N′-Diisopropylcarbodiimide
- DCM:
-
Dichloromethane
- DIEA:
-
N,N-Diisopropylethylamine
- DMAP:
-
4-(Dimethylamino)pyridine
- Dmb:
-
Dimethylbenzyl
- DMF:
-
N,N-Dimethylformamide
- EDT:
-
1,2-Ethanedithiol
- ESI MS:
-
Electro-spray ionization mass spectrometry
- Et:
-
Ethyl
- Fmoc:
-
[(Fluoren-1-yl-methoxy]carbonyl
- HBTU:
-
O-(Benzotriazol-1-yl)-N,N,N’,N’-tetramethyluronium hexafluorophosphate
- HFIP:
-
Hexafluoroisopropanol
- HOBt:
-
1-Hydroxybenzotriazole
- HPLC:
-
High performance liquid chromatography
- MALDI TOF:
-
Matrix-assisted laser desorption ionization time of flight
- Mpa:
-
Mercaptopropionic acid
- NMP:
-
N-Methylpyrrolidone
- PyBOP:
-
(Benzotriazol-1-yloxy)-tris(pyrrolidino)phosphonium hexafluorophosphate
- Sec:
-
Selenocysteine
- SPPS:
-
Solid-phase peptide synthesis
- tBu:
-
tert-Butyl
- TFA:
-
Trifluoroacetic acid
- THF:
-
Tetrahydrofuran
- Thz:
-
Thiazolidine-4-carboxylic acid
- TIS:
-
Tri-isopropylsilane
- TMS:
-
Trimethylsilyl
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Acknowledgments
This work was supported by grant of Czech Science Foundation (GA CR) No. 203/07/1517 and Research Project Z40550506. We greatly thanks to Miroslava Blechová and Alexandrina Prychodska for assembly of peptide sequences on automated peptide synthesizer; and to Lenka Monincová for some ESI-MS measurements.
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The nomenclature and symbols of the amino acids follow the Recommendations of the IUPAC/IUB Joint Commission on Biochemical Nomenclature. Eur J Biochem (1984) 138:9–37.
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Šebestík, J., Zawada, Z., Šafařík, M. et al. Comparative syntheses of peptides and peptide thioesters derived from mouse and human prion proteins. Amino Acids 43, 1297–1309 (2012). https://doi.org/10.1007/s00726-011-1203-9
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DOI: https://doi.org/10.1007/s00726-011-1203-9