Abstract
An insect antifreeze protein gene Mpafp149 was cloned by the RT-PCR approach from the desert beetle Microdera punctipennis dzungarica. Sequence analysis revealed that this gene encoding a protein of 120 amid acids and this protein showed 65–76% homology with other insect antifreeze proteins, the deduced amino acid sequence displays very high similarities in those regions that contain tandem the 12-residue repeats (TCTxSxxCxxAx) domain and the TCT motif. Mpafp149 gene was cloned into pET-28a vector and expressed in Escherichia coli. A single-step purification based on specific binding of histidine residues was achieved. The purified His-MpAFP149 was SDS–PAGE analyzed, showing an atypical migration with molecular weight of about 24 kDa. The expression of His-MpAFP149 was confirmed by Western blot with specific binding to anti-GST-MpAFP149 antibody. The thermal hysteresis activity of the purified recombinant protein was 0.915°C at 0.09 mg/ml, and the supercooling point was −9.6°C at 0.03 mg/ml. In vitro antifreeze activity assay by measuring the survival rate of bacteria at −7 and −20°C respectively, with the protection of His-MpAFP149 showed that the His-MpAFP149 fusion protein was able to enhance the freeze resistance of bacteria.
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Acknowledgments
The authors are grateful to Gan Zhao for the gene cloning. This work was supported by a grant from the National Natural Science Foundation of China (No.30760056).
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Qiu, L., Wang, Y., Wang, J. et al. Expression of biologically active recombinant antifreeze protein His-MpAFP149 from the desert beetle (Microdera punctipennis dzungarica) in Escherichia coli . Mol Biol Rep 37, 1725–1732 (2010). https://doi.org/10.1007/s11033-009-9594-3
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DOI: https://doi.org/10.1007/s11033-009-9594-3