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We developed a new plasmid system for easily assembling long, repetitive DNA sequences. This method allows for the creation of programmable protein polymers, like elastin-like polypeptides, for synthetic biology applications.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Synthesizing and assembling highly repetitive DNA sequences presents significant challenges in synthetic biology.
  • Existing methods limit the scalability and sequence definition required for complex genetic constructs.

Purpose of the Study:

  • To establish a modular plasmid framework for the scalable, sequence-defined assembly of repetitive DNA.
  • To enable the construction of long repetitive DNA sequences for applications in protein polymer engineering.

Main Methods:

  • A modular plasmid framework utilizing a Gibson Assembly-based digest-and-assemble workflow was developed.
  • Iterative amplification of repetitive DNA sequences, using pentapeptide Gly-Val-Gly-Val-Pro (GVGVP) repeats as a model, was performed.
  • Constructs were verified using whole-plasmid sequencing and protein expression in E. coli.

Main Results:

  • The plasmid framework enabled scalable, sequence-defined assembly of repetitive DNA, achieving constructs up to GVGVP1025.
  • Elastin-like polypeptides (ELPs) with temperature-dependent solubility were produced.
  • Functional protein polymers, including superfolder GFP fusions with up to 257 repeats, were characterized in E. coli.

Conclusions:

  • A generalizable strategy for constructing large repetitive DNA sequences has been established.
  • This method facilitates the engineering of programmable protein polymers with potential applications in materials science and biotechnology.
  • The developed framework overcomes previous limitations in the synthesis and assembly of repetitive DNA elements.