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The YΦ motif defines the structure-activity relationships of human 20S proteasome activators

Author

Listed:
  • Kwadwo A. Opoku-Nsiah

    (University of California San Francisco
    University of California San Francisco)

  • Andres H. Pena

    (Scripps Research Institute)

  • Sarah K. Williams

    (University of California San Francisco
    University of California San Francisco)

  • Nikita Chopra

    (University of California San Francisco
    University of California San Francisco
    University of California San Francisco)

  • Andrej Sali

    (University of California San Francisco
    University of California San Francisco
    University of California San Francisco)

  • Gabriel C. Lander

    (Scripps Research Institute)

  • Jason E. Gestwicki

    (University of California San Francisco
    University of California San Francisco)

Abstract

The 20S proteasome (20S) facilitates turnover of most eukaryotic proteins. Substrate entry into the 20S first requires opening of gating loops through binding of HbYX motifs that are present at the C-termini of certain proteasome activators (PAs). The HbYX motif has been predominantly characterized in the archaeal 20S, whereas little is known about the sequence preferences of the human 20S (h20S). Here, we synthesize and screen ~120 HbYX-like peptides, revealing unexpected differences from the archaeal system and defining the h20S recognition sequence as the Y-F/Y (YФ) motif. To gain further insight, we create a functional chimera of the optimized sequence, NLSYYT, fused to the model activator, PA26E102A. A cryo-EM structure of PA26E102A-h20S is used to identify key interactions, including non-canonical contacts and gate-opening mechanisms. Finally, we demonstrate that the YФ sequence preferences are tuned by valency, allowing multivalent PAs to sample greater sequence space. These results expand the model for termini-mediated gating and provide a template for the design of h20S activators.

Suggested Citation

  • Kwadwo A. Opoku-Nsiah & Andres H. Pena & Sarah K. Williams & Nikita Chopra & Andrej Sali & Gabriel C. Lander & Jason E. Gestwicki, 2022. "The YΦ motif defines the structure-activity relationships of human 20S proteasome activators," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28864-x
    DOI: 10.1038/s41467-022-28864-x
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    References listed on IDEAS

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    1. Yuko Hirano & Klavs B. Hendil & Hideki Yashiroda & Shun-ichiro Iemura & Ryoichi Nagane & Yusaku Hioki & Tohru Natsume & Keiji Tanaka & Shigeo Murata, 2005. "A heterodimeric complex that promotes the assembly of mammalian 20S proteasomes," Nature, Nature, vol. 437(7063), pages 1381-1385, October.
    2. Yanan Zhu & Wei Li Wang & Daqi Yu & Qi Ouyang & Ying Lu & Youdong Mao, 2018. "Structural mechanism for nucleotide-driven remodeling of the AAA-ATPase unfoldase in the activated human 26S proteasome," Nature Communications, Nature, vol. 9(1), pages 1-12, December.
    3. Tiffany A. Thibaudeau & Raymond T. Anderson & David M. Smith, 2018. "A common mechanism of proteasome impairment by neurodegenerative disease-associated oligomers," Nature Communications, Nature, vol. 9(1), pages 1-14, December.
    4. Frank G. Whitby & Eugene I. Masters & Larissa Kramer & J. Randolph Knowlton & Yi Yao & Ching C. Wang & Christopher P. Hill, 2000. "Structural basis for the activation of 20S proteasomes by 11S regulators," Nature, Nature, vol. 408(6808), pages 115-120, November.
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