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A novel framework for engineering protein loops exploring length and compositional variation.

Pedro A G Tizei1, Emma Harris2, Shamal Withanage3

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This summary is machine-generated.

Protein engineering advances with a new DNA assembly platform for insertions and deletions (indels). This tool efficiently creates and analyzes enzyme libraries with varied lengths and compositions, enabling novel protein designs.

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Area of Science:

  • Protein Engineering
  • Molecular Biology
  • Enzymology

Background:

  • Insertions and deletions (indels) significantly impact enzyme function, properties, and substrate specificity, playing a key role in protein evolution.
  • Despite their importance, indels are underutilized in protein engineering due to a lack of systematic platforms for generating and analyzing sequence variation.

Purpose of the Study:

  • To develop a novel DNA assembly platform for generating libraries with variable sequence composition and length.
  • To create a framework for analyzing selection outputs from indel-generated libraries using next-generation sequencing and alignment-free methods.

Main Methods:

  • Developed the InDel assembly platform using cycles of endonuclease restriction digestion and ligation of standardized dsDNA building blocks.
  • Integrated next-generation sequencing and alignment-free strategies for analyzing sequence data from engineered libraries.

Main Results:

  • Successfully engineered the TEM-1 β-lactamase Ω-loop, exploring modified loop lengths and compositions.
  • Identified multiple novel extended spectrum β-lactamases, demonstrating the platform's capability to explore previously uninvestigated sequence spaces.

Conclusions:

  • The InDel assembly and analysis platforms offer an efficient method for protein engineering, particularly for loops and linkers where both sequence length and composition are critical.
  • This approach expands the toolkit for protein engineers, enabling systematic exploration of indel-mediated sequence diversity.