2NAR image
Deposition Date 2016-01-08
Release Date 2017-01-11
Last Version Date 2024-05-01
Entry Detail
PDB ID:
2NAR
Keywords:
Title:
Solution structure of AVR3a_60-147 from Phytophthora infestans
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
10
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Effector protein Avr3a
Gene (Uniprot):Avr3a
Mutations:N7S
Chain IDs:A
Chain Length:102
Number of Molecules:1
Biological Source:Phytophthora infestans
Ligand Molecules
Primary Citation
The RxLR Motif of the Host Targeting Effector AVR3a ofPhytophthora infestansIs Cleaved before Secretion.
Plant Cell 29 1184 1195 (2017)
PMID: 28522546 DOI: 10.1105/tpc.16.00552

Abstact

When plant-pathogenic oomycetes infect their hosts, they employ a large arsenal of effector proteins to establish a successful infection. Some effector proteins are secreted and are destined to be translocated and function inside host cells. The largest group of translocated proteins from oomycetes is the RxLR effectors, defined by their conserved N-terminal Arg-Xaa-Leu-Arg (RxLR) motif. However, the precise role of this motif in the host cell translocation process is unclear. Here, detailed biochemical studies of the RxLR effector AVR3a from the potato pathogen Phytophthora infestans are presented. Mass spectrometric analysis revealed that the RxLR sequence of native AVR3a is cleaved off prior to secretion by the pathogen and the N terminus of the mature effector was found likely to be acetylated. High-resolution NMR structure analysis of AVR3a indicates that the RxLR motif is well accessible to potential processing enzymes. Processing and modification of AVR3a is to some extent similar to events occurring with the export element (PEXEL) found in malaria effector proteins from Plasmodium falciparum These findings imply a role for the RxLR motif in the secretion of AVR3a by the pathogen, rather than a direct role in the host cell entry process itself.

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Primary Citation of related structures