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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Multistep purification of cytochrome c PEGylated forms using polymer-based aqueous biphasic systems

Texto completo
Autor(es):
Santos, Joao H. P. M. [1, 2] ; Carretero, Gustavo [3] ; Coutinho, Joao A. P. [1] ; Rangel-Yagui, Carlota O. [2] ; Ventura, Sonia P. M. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Aveiro, Dept Chem, CICECO Aveiro Inst Mat, P-3810193 Aveiro - Portugal
[2] Univ Sao Paulo, Dept Biochem & Pharmaceut Technol, Av Prof Lineu Prestes 580 Bloco 16, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Chem Inst, Dept Biochem, Sao Paulo, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: GREEN CHEMISTRY; v. 19, n. 24, p. 5800-5808, DEC 21 2017.
Citações Web of Science: 2
Resumo

Chemical PEGylation of proteins has been used to improve their physicochemical properties and kinetics. However, the PEGylation reactions lead to a heterogeneous mixture of PEGylated conjugates and unreacted protein, which is a challenge for the design of an efficient downstream process. The purification of PEGylated proteins should address the two main issues: the separation of PEGylated conjugates from the unreacted protein and the fractionation of the PEGylated conjugates on the basis of their degree of PEGylation. The present study aims at the development of liquid-liquid extraction processes for the purification of PEGylated conjugates. An initial study of the partition behavior of cytochrome c and their PEGylated conjugates (Cyt-c-PEG-4 and Cyt-c-PEG-8) on polyethylene-glycol (PEG) + potassium phosphate buffer (pH = 7) aqueous biphasic systems (ABS) shows that PEGs with intermediate molecular weights (PEG MW = 1000-2000) allow the separation of the PEGylated conjugates from the unreacted protein in a single step. It is further shown that the PEGylated conjugates can be efficiently separated using ABS based on PEGs with high molecular weight (PEG MW = 6000-8000) and a study of the protein stability after purification was carried using circular dichroism. A downstream process to separate Cyt-c, Cyt-c-PEG-4 and Cyt-c-PEG-8 with high purities (96.5% Cyt-c, 85.8% Cyt-c-PEG-4, and 99.0% Cyt-cPEG-8) was developed. The process proposed addresses not only the efficient separation of each of the protein forms but also the recycling of the unreacted protein purified and the ABS phases, which was successfully used in a new step of PEGylation. (AU)

Processo FAPESP: 16/22065-5 - Pegilação N-terminal de proteínas e purificação por sistemas aquosos bifásicos
Beneficiário:Carlota de Oliveira Rangel Yagui
Linha de fomento: Auxílio à Pesquisa - Regular