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Structural and functional insights into the E3 ligase, RNF126.

Ewelina M Krysztofinska1, Santiago Martínez-Lumbreras1, Arjun Thapaliya1

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Ring finger protein 126 (RNF126) and the BAG6 complex collaborate to target hydrophobic proteins for degradation. This study reveals structural details of their interaction, clarifying protein sorting in the cytoplasm.

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Area of Science:

  • Cellular Biology
  • Protein Degradation
  • Biochemistry

Background:

  • The BAG6 complex, comprising BAG6, TRC35, and UBL4A, along with co-chaperone SGTA, handles hydrophobic substrates in the cytoplasm.
  • RNF126 is an E3 ubiquitin ligase involved in targeting proteins for proteasomal recycling.

Purpose of the Study:

  • To elucidate the structural basis of the interaction between RNF126 and the BAG6 complex.
  • To characterize the functional interplay between RNF126, SGTA, and the BAG6 complex in substrate sorting.

Main Methods:

  • Solution structure determination of the RNF126 zinc finger domain bound to the BAG6 UBL domain.
  • Biochemical characterization of RNF126 interactions with UBL4A.
  • Analysis of competitive binding between SGTA and RNF126 for the BAG6 N-terminal site.

Main Results:

  • The solution structure of the RNF126 zinc finger domain in complex with the BAG6 UBL domain was determined.
  • A novel interaction between RNF126 and UBL4A was characterized.
  • Competition between SGTA and RNF126 for binding to the N-terminal BAG6 site was analyzed, revealing distinct binding preferences.

Conclusions:

  • This research provides structural and mechanistic insights into the BAG6 complex's role in cytoplasmic protein sorting.
  • Understanding these interactions is crucial for comprehending the cellular mechanisms governing the fate of misfolded or stray hydrophobic proteins.