An Improved Procedure for the Preparation of Thrombin Low Molecular Weight Substrates - Peptide p-Nitroanilides
1Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow119121 Russia; *e-mail: EKolesanova@yandex.ru
2Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry RAS, 16/10 Miklukho-Maklaya str.,
Moscow GSP-7, 117997 Russia
Key words: chromogenic substrates; p-nitroanilides; solid-phase peptide synthesis; Bio-Beads SM-2; adsorption; thrombin
DOI:10.18097/BMCRM00057
Low molecular weight chromogenic thrombin peptide substrates, p-nitroanilides of short peptides protected at their N-terminal amino group, were prepared by solid-phase peptide synthesis on polystyrene-divinylbenzene polymer with trityl groups with preliminary attached p-phenylene diamine moiety. After the cleavage from the resin peptide p-aminoanilides were mildly oxidized to p-nitroanilides with the mixture of potassium sulfate and persulfate. Adsorption onto polymer support Bio-Beads SM-2 with further elution by acetonitrile allowed easy separating peptide p-nitroanilides from the oxidizer and obtaining the thrombin chromogenic substrate preparations with the target substance contents of not less than 95% and yields of 30 - 40%. Thrombin effectively catalyzed hydrolysis of the prepared substrates with KM and Vmax values of 29 - 134 µM and 0.03 - 1/16 µM/s, respectively.
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Table 1.
Characteristics of synthesized peptide p-nitroanilide thrombin substrates.
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Table 2.
Kinetic parameters of the synthesized substrate hydrolysis under the thrombin action. .
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ACKNOWLEDGEMENTS
Authors are grateful to Ms. Natalia A. Kazmina and Ms. Alena V. Kolesnichenko for excellent technical assistance. Element analysis of the p-phenylenediamine-modified resin was made at the Institute of Organic Chemistry RAS/ Peptide synthesis was performed on the equipment of the IBMC Core Facility @Human proteome@, which was supported by the Russian Ministry of Education and Science in the frame of the Agreement No. 14.621.21.0017 (project unique identifier RFMEFI62117X0017). The work was made in the frame of the Program of Basic Scientific Research for State Academies of Sciences for 2013-2020.
SUPPLEMENTARY
Supplementary materials are available at http://dx.doi.org/10.18097/BMCRM00057
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