Study summary · research use only
Recombinant expression of IGF-1 and LR3 IGF-1 fused with xylanase in Pichia pastoris
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This study (Pichia pastoris yeast expression system; a laboratory production study, not an animal or human trial) produced recombinant human IGF-1 and its analog Long R3 IGF-1 (LR3 IGF-1) by fusing them with the enzyme xylanase XynCDBFV. The authors report that purified IGF-1 and LR3 IGF-1 showed cell proliferation activity comparable to standard IGF-1, and that fermentation in a 15-L bioreactor achieved higher expression of the fusion proteins, reaching about 0.5 g/L for XynCDBFV-IGF-1 and 1 g/L for XynCDBFV-TEV-LR3 IGF-1. The authors describe this xylanase-fusion approach in P. pastoris as yielding higher recombinant expression of bioactive IGF-1 and LR3 IGF-1 for potential clinical and scientific applications.
Abstract
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. KEY POINTS: • Human IGF-1 and LR3 IGF-1 are produced in the P. pastoris expression system. • Purified IGF-1 and LR3 IGF-1 show bioactivity comparable to the standard IGF-1. • High heterologous expression of IGF-1 and LR3 IGF-1 is achieved by fermentation in a bioreactor.
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