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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • Selenocysteine (Sec) is incorporated into proteins via UGA codon recoding with SelB and SECIS elements.
  • A novel SECIS-free system uses the UAG amber codon and elongation factor Tu (EF-Tu) for Sec insertion.

Purpose of the Study:

  • To engineer EF-Tu for enhanced selenoprotein synthesis.
  • To improve the efficiency and yield of site-specific Sec incorporation using the UAG codon.

Main Methods:

  • Developed a Sec-specific selection system using human O(6)-alkylguanine-DNA alkyltransferase (hAGT) with a UAG codon.
  • Created an EF-Tu library by randomizing codons in the amino acid binding pocket.
  • Selected for EF-Tu variants with improved Sec incorporation into hAGT.

Main Results:

  • Identified conserved amino acid changes in selected EF-Tu variants.
  • The enhanced EF-Tu system (UTu-system with EF-Sel1) achieved >90% UAG-specific Sec incorporation efficiency.
  • Selenoprotein production yield was doubled with the improved system.

Conclusions:

  • Engineered EF-Tu variants significantly enhance site-specific selenocysteine incorporation via the UAG amber codon.
  • The improved system offers a powerful tool for synthetic biology and selenoprotein research.
  • This SECIS-free method provides a more efficient and versatile approach to selenoprotein synthesis.