Engineering of the Saccharomyces cerevisiae yeast strain with multiple chromosome-integrated genes of human alpha-fetoprotein and its high-yield secretory production, purification, structural and functional characterization

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• 作者：Elena Dudich^a ; ^b ; ^{elena_dudich@mail.ru} ; Igor Dudich^a ; ^b ; Lidia Semenkova^a ; ^b ; Sergey Benevolensky^c ; Elena Morozkina^c ; Aleksey Marchenko^c ; Sergey Zatcepin^c ; Dmitry Dudich^c ; ¹ ; Galina Soboleva^b ; Luidmila Khromikh^d ; Olga Roslovtceva^b ; Eduard Tatulov^b
• 关键词：Recombinant alpha-fetoprotein ; Saccharomyces cerevisae ; Circular dichroism ; Tumor suppression ; Apoptosis ; Immunosuppression
• 刊名：Protein Expression and Purification
• 出版年：2012
• 期刊代码：184_10465928
• 类别：bio
• 出版时间：July, 2012
• 卷：84
• 期：1
• 页码：94-107
• 文件大小：1488 K

摘要

Alpha-fetoprotein (AFP) is a biological drug candidate of high medicinal potential in the treatment of autoimmune diseases, cancer, and regenerative medicine. Large-scale production of recombinant human alpha-fetoprotein (rhAFP) is desirable for structural and functional studies and applied research. In this study we cloned and expressed in the secreted form wild-type glycosylated human rhAFP and non-glycosylated mutant rhAFP₀ (N233S) in the yeast strain Saccharomyces cerevisiae with multiple chromosome-integrated synthetic human AFP genes. RhAFP and rhAFP₀ were successfully produced and purified from the culture liquids active naturally folded proteins. Elimination of the glycosylation by mutation reduced rhAFP₀ secretion about threefold as compared to the wild-type protein showing critical role of the N-linked glycan for heterologous protein folding and secretion. Structural similarity of rhAFP and rhAFP₀ with natural embryonic eAFP was confirmed by circular dichroism technique. Functional tests demonstrated similar type of tumor suppressive and immunosuppressive activity for both recombinant species rhAFP and rhAFP₀ as compared to natural eAFP. It was documented that both types of biological activities attributed to rhAFP and rhAFP₀ are due to the fast induction of apoptosis in tumor cells and mitogen-activated lymphocytes. Despite the fact that rhAFP and rhAFP₀ demonstrated slightly less effective tumor suppressive activity as compared to eAFP but rhAFP₀ had produced statistically notable increase in its ability to induce inhibition of in vitro lymphocyte proliferation as compared to the glycosylated rhAFP and eAFP. We conclude that N-linked glycosylation of rhAFP is required for efficient folding and secretion. However the presence of N-linked sugar moiety was shown to be unimportant for tumor suppressive activity but was critically important for its immunoregulative activity which demonstrates that different molecular mechanisms are involved in these two types of biological functional activities attributed to AFP.