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  Chemical phosphorylation of the peptides GGXA (X = S, T, Y): an evaluation of different chemical approaches

Hoffmann, R., Wachs, W., Berger, R., Kalbitzer, H. R., Waidelich, D., Bayer, E., et al. (1995). Chemical phosphorylation of the peptides GGXA (X = S, T, Y): an evaluation of different chemical approaches. International Journal of Peptide and Protein Research, 45(1), 26-34. doi:10.1111/j.1399-3011.1995.tb01564.x.

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Hoffmann, R., Author
Wachs, W.O., Author
Berger, R.G., Author
Kalbitzer, H. R.1, Author              
Waidelich, D., Author
Bayer, E., Author
Wagner-Redeker, W., Author
Zeppezauer, M., Author
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1Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497712              

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 Abstract: An evaluation was made of the two methods most commonly used for phosphorylation of hydroxyamino acids in peptides, i.e. the tetrazole-catalysed phosphitylation by di-tert-butyl-N,N-diethylphosphoramidite followed by oxidation and the phosphorylation by dibenzylphosphochloridate. As model system the sequence GGXA (X = S, T, Y) was used which represents a random-coil sequence avoiding the influence on the reaction kinetics of secondary structure formation. In the case of serine- and threonine-containing peptides, both synthetic methods gave comparable yields of the desired phosphopeptides. The phosphorylation of tyrosine was achieved more favorably via the phosphoramidite method. However, phosphotyrosine peptides are most easily obtained by peptide synthesis using Fmoc-Tyr(PO3Me2)OH as building block. The dibenzylphosphochloridate method yields the expected phosphopeptides as the only peptide derivative and in addition, a great number of unidentified by-products which can be removed by ion-exchange chromatography. The phosphoramidite method consistently resulted in three peptide derivatives, i.e. the desired phosphopeptide, the phosphitylated peptide and a bridged derivative with two GGXA fragments linked through a phosphodiester bridge. The derivatives were characterised by RP and ion-exchange chromatography, 31P- and 1H-NMR spectroscopy, and ion-spray and electrospray mass spectrometry. Interestingly, even these mild ionisation techniques resulted in partial fragmentation. The observed fragmentation pathways seem to be a diagnostic tool for the identification of phosphorylation sites in peptides. Both the phosphorylated serine and threonine peptide lost phosphoric acid (98 mass units), the tyrosine peptide lost phenyl phosphate (174 mass units).(ABSTRACT TRUNCATED AT 250 WORDS)

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Language(s): eng - English
 Dates: 1995-01-01
 Publication Status: Published in print
 Pages: 9
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 Table of Contents: -
 Rev. Type: Peer
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Title: International Journal of Peptide and Protein Research
Source Genre: Journal
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Publ. Info: Copenhagen : Munksgaard International Publishers
Pages: - Volume / Issue: 45 (1) Sequence Number: - Start / End Page: 26 - 34 Identifier: ISSN: 0367-8377
ISSN: 0300-9769