8J4A image
Entry Detail
PDB ID:
8J4A
Keywords:
Title:
Crystal structure of OY phytoplasma SAP05 in complex with AtRPN10
Biological Source:
PDB Version:
Deposition Date:
2023-04-19
Release Date:
2024-02-28
Method Details:
Experimental Method:
Resolution:
1.97 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Sequence-variable mosaic (SVM) signal sequence domain-containing protein
Chain IDs:A, B (auth: C)
Chain Length:104
Number of Molecules:2
Biological Source:Onion yellows phytoplasma OY-M
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 4 homolog
Chain IDs:C (auth: D), D (auth: B)
Chain Length:194
Number of Molecules:2
Biological Source:Arabidopsis thaliana
Primary Citation
Molecular basis of SAP05-mediated ubiquitin-independent proteasomal degradation of transcription factors.
Nat Commun 15 1170 1170 (2024)
PMID: 38326322 DOI: 10.1038/s41467-024-45521-7

Abstact

SAP05, a secreted effector by the obligate parasitic bacteria phytoplasma, bridges host SPL and GATA transcription factors (TFs) to the 26 S proteasome subunit RPN10 for ubiquitination-independent degradation. Here, we report the crystal structures of SAP05 in complex with SPL5, GATA18 and RPN10, which provide detailed insights into the protein-protein interactions involving SAP05. SAP05 employs two opposing lobes with an acidic path and a hydrophobic path to contact TFs and RPN10, respectively. Our crystal structures, in conjunction with mutagenesis and degradation assays, reveal that SAP05 targets plant GATAs but not animal GATAs dependent on their direct salt-bridged electrostatic interactions. Additionally, SAP05 hijacks plant RPN10 but not animal RPN10 due to structural steric hindrance and the key hydrophobic interactions. This study provides valuable molecular-level information into the modulation of host proteins to prevent insect-borne diseases.

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