Enhanced secretion of heterologous proteins in Pichia pastoris following overexpression of Saccharomyces cerevisiae chaperone proteins.
Biotechnol Prog
; 22(4): 1090-5, 2006.
Article
en En
| MEDLINE
| ID: mdl-16889384
In Pichia pastoris, secretory proteins are folded and assembled in the endoplasmic reticulum (ER). However, upon introduction of foreign proteins, heterologous proteins are often retained in the cytoplasm or in the ER as a result of suboptimal folding conditions, leading to protein aggregation. The Hsp70 and Hsp40 chaperone families in the cytoplasm or in ER importantly regulate the folding and secretion of heterologous proteins. However, it is not clear which single chaperone is most important or which combination optimally cooperates in this process. In the present study we evaluated the role of the chaperones Kar2p, Sec63, YDJ1p, Ssa1p, and PDI from Saccharomyces cerevisiae. We found that the introduction of Kar2p, Ssa1p, or PDI improves protein secretion 4-7 times. In addition, we found that the combination chaperones of YDJ1p/PDI, YDJ1p/Sec63, and Kar2p/PDI synergistically increase secretion levels 8.7, 7.6, and 6.5 times, respectively. Therefore, additional integration of chaperone genes can improve the secretory expression of the heterologous protein. Western blot experiments revealed that the chaperones partly relieved the secretion bottleneck resulting from foreign protein introduction in P. pastoris. Therefore, the findings from the present study demonstrate the presence of a network of chaperones in vivo, which may act synergistically to increase recombinant protein yields.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Pichia
/
Saccharomyces cerevisiae
/
Glicoproteínas
/
Regulación Fúngica de la Expresión Génica
/
Proteínas de Saccharomyces cerevisiae
Idioma:
En
Revista:
Biotechnol Prog
Asunto de la revista:
BIOTECNOLOGIA
Año:
2006
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
Estados Unidos