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Synthetic Spider Silk Production on a Laboratory Scale
13:36

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Efficient protein production inspired by how spiders make silk.

Nina Kronqvist1, Médoune Sarr1, Anton Lindqvist2

  • 1Division for Neurogeriatrics, Department of NVS, Center for Alzheimer Research, Karolinska Institutet, 141 57 Huddinge, Sweden.

Nature Communications
|May 24, 2017
PubMed
Summary

Researchers developed a spider silk protein fragment (NT*) to improve the recombinant production of difficult-to-express proteins. This new tool enhances protein solubility and purification, aiding pharmaceutical development and creating synthetic lung surfactant.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Biotechnology

Background:

  • Membrane proteins are crucial pharmaceutical targets but challenging for recombinant production due to aggregation.
  • Spider silk proteins achieve high concentrations via micellar structures, with the N-terminal domain (NT) forming a soluble shell.

Purpose of the Study:

  • To investigate if fusion to the NT domain can enhance the solubility of non-spidroin proteins.
  • To engineer a stabilized, hypersoluble, and pH-insensitive NT mutant (NT*) for improved recombinant protein expression.

Main Methods:

  • Designing and constructing a charge-reversed N-terminal domain mutant (NT*).
  • Creating fusion proteins between NT* and target proteins, including transmembrane proteins.
  • Expressing and purifying fusion proteins in Escherichia coli.
  • Testing the efficacy of NT*-based synthetic lung surfactant in an animal model.

Main Results:

  • NT*-transmembrane protein fusions yielded up to eight times more soluble protein than conventional tags in E. coli.
  • NT* enabled homogeneous purification of transmembrane peptides without chromatography.
  • Developed a low-cost synthetic lung surfactant using NT* that demonstrated efficacy in an animal model.
  • Showcased efficient expression and purification of other challenging, non-transmembrane proteins.

Conclusions:

  • Fusion to the engineered NT* domain significantly enhances the solubility and recombinant production of aggregation-prone proteins, including membrane proteins.
  • NT* provides a versatile and efficient tool for purifying difficult proteins and developing novel biomaterials like synthetic lung surfactant.
  • This approach offers a valuable new strategy for tackling 'reluctant proteins' in biotechnology and pharmaceutical research.