Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 107, Issue 14, Pages 4543-4551Publisher
SPRINGER
DOI: 10.1007/s00253-023-12606-0
Keywords
IGF-1; LR3 IGF-1; Xylanase; Fusion protein; P; pastoris
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Human insulin-like growth factor-1 (IGF-1) and its analog Long R3 IGF-1 (LR3 IGF-1) were successfully recombinantly expressed and produced in the Pichia pastoris expression system by fusion with highly expressed xylanase XynCDBFV. The purified IGF-1 and LR3 IGF-1 displayed excellent bioactivity of cell proliferation compared to the standard IGF-1. Furthermore, high heterologous expression levels of the fusion proteins were achieved by fermentation in a 15-L bioreactor, which could be used for both clinical and scientific applications.
Insulin-like growth factor-1 (IGF-1) is a pleiotropic protein hormone and has become an attractive therapeutic target because of its multiple roles in various physiological processes, including growth, development, and metabolism. However, its production is hindered by low heterogenous protein expression levels in various expression systems and hard to meet the needs of clinical and scientific research. Here, we report that human IGF-1 and its analog Long R3 IGF-1 (LR3 IGF-1) are recombinant expressed and produced in the Pichia pastoris (P. pastoris) expression system through being fused with highly expressed xylanase XynCDBFV. Furthermore, purified IGF-1 and LR3 IGF-1 display excellent bioactivity of cell proliferation compared to the standard IGF-1. Moreover, higher heterologous expression levels of the fusion proteins XynCDBFV-IGF-1 and XynCDBFV-LR3 IGF-1 are achieved by fermentation in a 15-L bioreactor, reaching up to about 0.5 g/L XynCDBFV-IGF-1 and 1 g/L XynCDBFV-TEV-LR3 IGF-1. Taken together, high recombinant expression of bioactive IGF-1 and LR3 IGF-1 is acquired with the assistance of xylanase as a fusion partner in P. pastoris, which could be used for both clinical and scientific applications.
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