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Synthetic conformational antigen which simulates the extracellular part of the M2-muscarinic receptor: interaction with blood sera of patients suffering from idiopathic arrhythmias

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Abstract

Fragments corresponding to the 83–98 sequence of the first extracellular loop and to the 168–192 and 171–182 sequences of the second extracellular loop of the M2-muscarinic receptor (antibodies to this receptor could be markers of early symptoms of heart disorders) were synthesized by solid phase method using the Fmoc-SPPS strategy. A new conformational antigen with the natural location of the disulfide bridge was prepared by selective formation of disulfide bond between the corresponding cysteine residues in the synthe-sized peptides and characterized. The comparative analysis of reactivity of the synthesized peptides towards sera from patients which had no organic heart disease was performed. A new conformational antigen was effectively bound to the sera from patients with idiopathic arrhythmias, but without symptoms of organic heart disease.

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Abbreviations

Boc:

tert-butyloxycarbonyl

BSA:

bovine serum albumin

But :

tert-butyl

DCM:

dichloromethane

DIPEA:

N,N-diisopropylethylamine

Fmoc:

9-fluorenylmethyloxycar-bonyl

HOBT:

1-hydroxybenzotriazole

MALDI:

matrix-assisted laser desorption/ionization

NMP:

N-methylpyrroli-done

MePip:

4-methylpiperidine

PyS:

2-pyridinesulfenyl

ODS:

octadecylsilyl

Pmc:

2,2,5,7,8-pentamethylchroman-6-sulfonyl

TBTU:

N,N,N,N′-tetramethyl-O-(benzotriazole-1-yl)uronium tetrafluoroborate

TIBS:

triisobutyl silane

TFA:

tri-fluoroacetic acid

HPLC:

high performance liquid chromatog-raphy

EIA:

enzyme immunoassay

CRD:

cardiac rhythm disturbance

SPPS:

solid phase peptide synthesis. Other abbreviations used were recommended by IUPAC-IUB

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Correspondence to M. E. Palkeeva.

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Original Russian Text © M.E. Palkeeva, M.V. Sidorova, A.S. Molokoedov, A.A. Az’muko, Zh.D. Bespalova, T.V. Sharf, E.N. Mamochkina, E.E. Efremov, M.M. Rogova, N.A. Mironova, K.A. Zykov, S.P. Golitsyn, 2013, published in Bioorganicheskaya Khimiya, 2013, Vol. 39, No. 3, pp. 285–292.

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Palkeeva, M.E., Sidorova, M.V., Molokoedov, A.S. et al. Synthetic conformational antigen which simulates the extracellular part of the M2-muscarinic receptor: interaction with blood sera of patients suffering from idiopathic arrhythmias. Russ J Bioorg Chem 39, 252–258 (2013). https://doi.org/10.1134/S1068162013030102

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