8ZGA

F-degron fused ZZ-domain of the Arabidopsis thaliana E3 ubiquitin-protein ligase PRT1

Summary for 8ZGA

• Entry DOI: 10.2210/pdb8zga/pdb
• Descriptor: F-degron,E3 ubiquitin-protein ligase PRT1, ZINC ION, MAGNESIUM ION, ... (4 entities in total)
• Functional Keywords: complex, zz-domain, arabidopsis thaliana, prt1, e3-ubiquitin ligase, ligase
• Biological source: Arabidopsis thaliana; More
• Total number of polymer chains: 6
• Total formula weight: 47890.46

Authors

Yang, W.S.,Song, H.K. (deposition date: 2024-05-09, release date: 2025-05-14, Last modification date: 2025-09-03)

Primary citation

Yang, W.S.,Kim, S.H.,Kim, M.,Shin, H.,Lee, J.,Sandmann, A.,Park, O.K.,Dissmeyer, N.,Song, H.K.
Structural basis for the recognition and ubiquitylation of type-2 N-degron substrate by PRT1 plant N-recognin.
Nat Commun, 16:7817-7817, 2025

PubMed Abstract: PROTEOLYSIS1 (PRT1), an N-recognin of Arabidopsis thaliana, recognizes the N-terminal aromatic hydrophobic residue (Tyr/Phe/Trp) of its substrates and ubiquitylates them for degradation by the ubiquitin-proteasome system. Herein, we report the structures of the ZZ domain of PRT1 (PRT1) in complex with bulky hydrophobic N-degron peptides. Unlike other ZZ domains, PRT1 has an unusual binding site with two hydrophobic regions. The N-terminal aromatic residues of N-degrons interact with Ile333 and Phe352 in the flexible loops, which undergo a conformational change. Notably, we identify a third residue from the N-terminus of the substrate that participates in the hydrophobic network with PRT1. Moreover, AlphaFold prediction and biochemical assays revealed that the tandem RING1 and RING2 domains of PRT1 interact intramolecularly. The dimeric RING domains in a single protein represent a unique feature among the RING-type E3 ligases. The biochemical assays using the N-terminal tyrosine-exposed substrate, BIG BROTHER, show that the intramolecular RING dimer is essential for PRT1's robust activity. Therefore, this study expands our knowledge of the structural repertoire in the N-degron pathway and provides insights into the regulation of E3 ligases containing tandem RING domains.

PubMed: 40841552
DOI: 10.1038/s41467-025-63282-9

Experimental method

X-RAY DIFFRACTION (2.1 Å)