High-level secretory expression of recombinant type Ⅲ human?like collagen in Pichia pastoris via multilevel systematic optimization

• 1、National Engineering Research Center for Cereal Fermentation and Food Biomanufacturing, School of Biotechnology, Jiangnan University, Wuxi 214122
• 2、Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Life Sciences and Health Engineering, Jiangnan University, Wuxi 214122
• 3、Innovation Center for Advanced Brewing Science and Technology, College of Biomass Science and Engineering, Sichuan University, Chengdu 610065

Abstract：Collagen is the main component that makes up the internal structure of animals and is extensively used in several industrial fields including food, materials, chemicals, and pharmaceuticals. Despite the variety of preparation methods available, there is significant potential for enhancing the yield of recombinant collagen produced through engineered Pichia pastoris. Increasing the copy number of the recombinant type III human collagen (hlCOLIII) gene to improve the level of expression of the recombinant protein and co-expression of molecular chaperones to alleviate the resulting endoplasmic reticulum stress further promotes hlCOLIII secretion. By optimizing transcription driven by the AOX1 promoter and improving translation efficiency, a strain of P. pastoris expressing hlCOLIII efficiently was constructed, achieving a yield of 10.3 g L-1 in a 5-L fermenter. Further, hlCOLIII demonstrated notable antioxidant capacity and performed well in bioactivity analyses, including cell proliferation, migration, and adhesion. This study lays a solid foundation for the scalable industrial production of recombinant collagen and opens new avenues for its exploration in advanced biomedical materials.

keywords： human?like collagen, fermentation, protein purification, characterization

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