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Regulating ferredoxin electron transfer using nanobody and antigen interactions.

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Engineered ferredoxin (Fd) fragments can regulate cellular electron transfer based on macromolecular binding. This study demonstrates how fusing Fd fragments to nanobodies creates novel biomolecular switches.

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Area of Science:

  • Protein engineering
  • Biochemistry
  • Molecular biology

Background:

  • Protein fission and fusion enable the creation of novel regulatory functions.
  • Ferredoxins (Fd) engineered for small molecule-dependent electron transfer are established.
  • The potential of Fd fragments to monitor macromolecular binding remains unexplored.

Purpose of the Study:

  • To investigate the use of ferredoxin (Fd) fragments for monitoring macromolecular binding reactions.
  • To engineer Fd fragments fused to nanobodies and their antigens.
  • To assess the impact of fusion strategies on Fd-mediated electron transfer.

Main Methods:

  • Fusing fragments of *Mastigocladus laminosus* Fd to nanobodies and protein antigens.
  • Utilizing split proteins with Fd fragments fused to green fluorescent protein (GFP) and anti-GFP nanobodies.
  • Expressing engineered proteins in *Escherichia coli* to evaluate Fd-mediated electron transfer from Fd-NADP reductase (FNR) to sulfite reductase (SIR).

Main Results:

  • Split proteins supporting Fd-mediated electron transfer were identified when Fd fragments were fused to GFP and anti-GFP nanobodies.
  • The order of nanobody and antigen fusion to Fd fragments influenced cellular electron transfer efficiency.
  • Insertion of anti-GFP nanobodies within Fd exhibited varied effects; one variant required GFP coexpression, while others functioned independently.

Conclusions:

  • Ferredoxins can be engineered for macromolecule-regulated electron transfer.
  • The fusion strategy and nanobody choice are critical for developing functional biomolecular switches.
  • Exploring diverse nanobody homologs and fusion approaches is essential for optimizing engineered Fd-based systems.