Effect of Acyl Homoserine Lactone on Recombinant Production of Human Insulin-like Growth Factor-1 in Batch Culture of Escherichia coli

Author(s): Valiollah Babaeipour, Hossein Vahidi, Shamila Alikhani, Javad Ranjbari*, Abbas Alibakhshi, Maryam Tabarzad*.

Journal Name: Protein & Peptide Letters

Volume 25 , Issue 11 , 2018

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Abstract:

Background: IGF-I as a human growth factor produced in Escherichia coli is a single, non-glycosylated, polypeptide chain containing 70 amino acids and having a molecular mass of 7.6 kDa. Up to now, E. coli expression system has been widely used as the host to produce rhIGF-1 with high yields. Acyl Homoserine Lactones (AHLs) are intercellular signaling molecules used in quorum sensing by Gram-negative bacteria. Quorum sensing is a cell density-dependent gene regulation process that allows bacterial cells to express specific genes only when signaling molecules reach the sufficient concentration.

Objective: For the first time, this study focuses on the N-hexanoyl-L- Homoserine Lactone (HHL) activity on increasing the cell growth and rh-IGF-1concentration in batch culture of E. coli.

Method: The maximum production of rhIGF-I was previously optimized in 32y culture medium at 32°C with 0.05 mM IPTG as inducer and 10 g/l glucose concentration. Under this condition, different amounts of HHL (0.001 µg/ml, 1 µg/ml, and 100µg/ml) were evaluated as an inducer for IGF-1 production.

Results: Generally, with increasing of HHL concentration, an increase in dry cell weight (2.45 mg/ml to 4.63 mg/ml) and IGF-I expression level (0.4 mg/ml to 0.77 mg/ml) was observed.

Conclusion: HHL or other types of AHLs can be considered as protein production inducer in bacterial expression systems through the quorum sensing pathways.

Keywords: Insulin like growth factor 1, acyl homoserine lactone, batch culture, fermentation, origami strain, E. coli, quorum sensing.

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Article Details

VOLUME: 25
ISSUE: 11
Year: 2018
Page: [980 - 985]
Pages: 6
DOI: 10.2174/0929866525666181019150657
Price: $58

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