The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
AVR-Pia is a secreted effector of the rice blast fungus Pyricularia oryzae, also called Magnaporthe oryzae—not the rice Pia resistance gene or the distinct fungal effector AVR-Pik. The supplied UniProt record identifies B9WZW9 as AVR-Pia and cites EMBL BAH23994.1; the papers retrieved independently establish the identity and function of the fungal protein named AVR-Pia, although they do not independently cross-reference that accession to their experimental sequence. The original cloning study identified the fungal locus as pex22 and showed that introducing it into an AVR-Pia-negative isolate restored avirulence specifically on Pia-bearing rice. (sornkom2017fluorescentreporteranalysis pages 1-2, yoshida2009associationgeneticsreveals pages 4-6)
AVR-Pia’s best-established molecular activity is binding rice proteins through heavy metal-associated (HMA) domains. Binding the HMA domain integrated into the rice immune receptor RGA5 makes the fungus detectable and triggers resistance when the partner receptor RGA4 is present. More recent work identified four other rice HMA-domain proteins that bind AVR-Pia, making host-protein engagement a plausible route to its infection-promoting activity. No catalytic reaction, transported substrate, or specific host biochemical pathway altered by AVR-Pia has been demonstrated; it should be annotated as an intracellularly acting protein-binding effector, not as an enzyme, transporter, or fungal HMA protein. The HMA domain belongs to its rice binding partners, not to AVR-Pia. (ortiz2017recognitionofthe pages 1-2, maidment2026twofoldsmany pages 6-9, maidment2026twofoldsmany pages 18-20)
The encoded protein is 85 amino acids long, including a predicted 19-residue N-terminal secretion signal; the original sequence analysis identified no conventional functional domain. Subsequent experimental NMR structure determination placed the mature protein in the MAX (Magnaporthe avirulence and ToxB-like) structural family: its core comprises two antiparallel three-stranded β-sheets forming a β-sandwich, stabilized by a disulfide bond. MAX membership resolves the apparent absence of a recognizable sequence-based family annotation: proteins in this family can share a fold despite little sequence similarity. Structural homology does not imply that AVR-Pia and other MAX effectors have identical host targets. (yoshida2009associationgeneticsreveals pages 4-6, wei2023recentadvancesin pages 5-7, guillen2015structureanalysisuncovers pages 10-13, maidment2026twofoldsmany pages 2-4)
In the original association study, presence of pex22 across 22 fungal isolates perfectly tracked the AVR-Pia phenotype (P = 3.8 × 10⁻⁵); complementation restored resistance-inducing activity on Pia-positive Sasanishiki but not on Pia-negative Shin-2. Expression of pex22 inside Pia-positive rice cells induced cell death, including when its secretion signal was removed. These experiments establish its avirulence-determinant function and intracellular recognizability, not a defined enzymatic activity or proof that each host interactor promotes susceptibility. The gene also shows presence/absence variation among isolates. A 2026 study estimates that AVR-Pia occurs in approximately 20% of rice-infecting isolates; that estimate should not be interpreted as a universal frequency across locations or seasons. (yoshida2009associationgeneticsreveals pages 4-6, yoshida2009associationgeneticsreveals pages 9-11, yoshida2009associationgeneticsreveals pages 6-9, maidment2026twofoldsmany pages 2-4)
AVR-Pia is made by the fungus during infection. Reporter experiments detected induction during appressorial differentiation, before penetration; expression was visible even in a penetration-deficient fungal mutant. A functional fluorescent AVR-Pia fusion accumulated at the biotrophic interfacial complex (BIC) beside invasive hyphae, colocalized with the BIC effector PWL2, and was detected in the rice-cell cytoplasm after delivery. Reporter measurements detected induction at approximately 18 hours post-inoculation and BIC-associated fusion protein at approximately 27–30 hours. Deleting the signal-peptide coding region altered the secretion-associated localization pattern. Thus, the best-supported route is fungal production → secretion to the infection interface/BIC → delivery into the host cell, with the key characterized binding and recognition events occurring intracellularly. (sornkom2017fluorescentreporteranalysis pages 2-3, sornkom2017fluorescentreporteranalysis pages 3-6)
Some experimental AVR-Pia and receptor fusions also showed nuclear as well as cytoplasmic fluorescence in transient-expression assays. This does not establish a specifically nuclear virulence function; infection imaging and intracellular receptor recognition support a host-cytoplasmic action, while the exact subcellular sites and physiological consequences of binding the newly identified rice proteins remain unresolved. (cesari2013thericeresistance pages 7-9, sornkom2017fluorescentreporteranalysis pages 3-6, maidment2026twofoldsmany pages 18-20)
In rice carrying the Pia locus, RGA5 is the sensor nucleotide-binding leucine-rich repeat receptor and RGA4 is its cell-death/defence-signalling partner. The resistance-competent RGA5-A isoform binds AVR-Pia directly; RGA4 is required for effective resistance but was not the direct AVR-Pia-binding partner in the reported interaction assays. RGA5 restrains RGA4-associated cell death in the absence of a recognized effector. Recognition through RGA5’s C-terminal integrated RATX1/HMA domain enables RGA4-dependent effector-triggered immunity and a localized hypersensitive cell-death response. This is a host defence pathway activated by detection of AVR-Pia, not a demonstrated immune-signalling activity intrinsically catalysed by the fungal protein. (cesari2013thericeresistance pages 1-2, cesari2013thericeresistance pages 7-9, liu2024therolesof pages 7-9, ortiz2017recognitionofthe pages 1-2)
Biophysical analysis measured an apparent dissociation constant of 7.8 µM for purified AVR-Pia binding the RGA5 integrated HMA domain. Structure-guided substitutions at AVR-Pia’s exposed binding surface impaired HMA engagement; notably, F24S rendered the effector fully virulent on Pia rice in infection assays, whereas some substitutions that weakened binding remained recognizable. AVR-Pia also associates with RGA5 regions outside the HMA domain, but those contacts alone did not substitute for HMA-dependent recognition. The naturally occurring AVR-Pia-H3 variant carries F24S and T46N and evades normal RGA5-mediated detection without a major change to its MAX fold. These results make binding to RGA5-HMA a mechanistically supported determinant of race-specific resistance, while leaving details of the receptor pair’s activation transition incompletely resolved. (ortiz2017recognitionofthe pages 4-5, ortiz2017recognitionofthe pages 7-9, ortiz2017recognitionofthe pages 2-4, maidment2026twofoldsmany pages 6-9)
A peer-reviewed study published 13 July 2026—newer than the requested 2023–2024 priority window—validated binding of AVR-Pia to OsHPP09, OsHPP10, OsHPP11 and OsHIPP21. It used complementary protein-interaction assays in vitro and in plant tissue, measured binding of purified HMA domains by isothermal titration calorimetry (ITC), and solved the AVR-Pia–OsHPP09-HMA crystal structure. These are experimentally supported interactors or candidate virulence targets, not four proven susceptibility genes for AVR-Pia. Preliminary screens produced additional candidate hits; the four listed here are the interactors carried forward into the reported biochemical characterization. (maidment2026twofoldsmany pages 1-2, maidment2026twofoldsmany pages 2-4, maidment2026twofoldsmany pages 6-9)
The affinity comparison below concerns isolated HMA domains, not full-length proteins inside infected rice. The cited study’s Figure 2 reports three independent ITC experiments for each newly measured interaction. (maidment2026twofoldsmany pages 6-9, maidment2026twofoldsmany media e322509a)
| Rice protein HMA domain | Biological class | AVR-Pia apparent KD (in vitro ITC) | Significance |
|---|---|---|---|
| OsHPP09-HMA | HPP | 115 nM | Strongest validated interaction; approximately 68-fold tighter than RGA5-HMA |
| OsHPP11-HMA | HPP | 772 nM | High-affinity, submicromolar interaction |
| OsHIPP21-HMA | HIPP | 1.29 µM | Intermediate-affinity interaction |
| OsHPP10-HMA | HPP | 5.26 µM | Weakest of the four validated host-protein interactions |
| RGA5-HMA integrated domain | NLR-integrated HMA | 7.8 µM | Immune-receptor reference value from a separate, older assay reported in 2017 |
Table: Apparent domain-level affinities measured with purified HMA domains; these values do not establish full-length binding or efficacy in plant cells. Host-target values are from peer-reviewed Maidment et al. (2026), Figure 2 and text, while RGA5-HMA is the separately reported 2017 reference (maidment2026twofoldsmany pages 6-9, maidment2026twofoldsmany pages 17-18, maidment2026twofoldsmany media e322509a, ortiz2017recognitionofthe pages 4-5).
In the OsHPP09 complex, AVR-Pia forms an antiparallel β-sheet interface with the rice HMA domain, supplemented by hydrogen bonds and salt bridges. Replacing OsHPP09 E16 disrupted AVR-Pia binding without grossly disrupting the HMA fold, providing a potential target for future structure-guided host modification. The naturally occurring AVR-Pia-H3 substitutions also disrupted detectable stable binding to the newly characterized HMA proteins. Despite sharing the MAX fold, AVR-Pik and PWL2 preferentially engage different HMA-protein subsets; their experimentally demonstrated effects on their own targets must not be assigned to AVR-Pia. (maidment2026twofoldsmany pages 12-14, maidment2026twofoldsmany pages 14-17, maidment2026twofoldsmany pages 6-9, maidment2026twofoldsmany pages 17-18)
Interpretive limit: Binding is firmly demonstrated, and the 2026 authors describe AVR-Pia as contributing to rice virulence. Their host-interactor experiments do not establish which of these four interactions changes rice susceptibility, what host process is manipulated, whether the interactions occur at a particular host organelle during natural infection, or whether modifying OsHPP09 E16 protects a crop in the field. The authors explicitly identify functional outcomes and possible redundancy among HMA-targeting effectors as open questions. (maidment2026twofoldsmany pages 2-4, maidment2026twofoldsmany pages 17-18, maidment2026twofoldsmany pages 18-20)
AVR-Pia presence and functional allele status can inform Pia-dependent isolate phenotyping and resistance-gene matching, but its isolate-level presence/absence and immune-evasive variants limit reliance on Pia alone. The receptor–effector structures provide a testbed for engineering rice immune recognition: a 2022 RGA5-HMA design gained new effector recognition in a heterologous assay yet did not gain the corresponding resistance in transgenic rice, whereas a February 2024 three-interface engineered receptor, RGA5^HMA5, conferred resistance in transgenic rice to strains expressing the different effector AVR-PikD. Importantly, that engineered construct did not retain AVR-Pia recognition in the assays reported. These are controlled experimental implementations, not evidence of field deployment or of AVR-Pia-specific protection by RGA5^HMA5. (yoshida2009associationgeneticsreveals pages 4-6, ortiz2017recognitionofthe pages 2-4, cesari2022newrecognitionspecificity pages 1-2, zhang2024thesyntheticnlr pages 2-5, zhang2024thesyntheticnlr pages 5-8)
Annotation conclusion. Assign AVR-Pia to the fungal secreted MAX effector structural family; describe its supported activity as binding intracellular rice HMA-domain proteins, including the RGA5 immune sensor. Annotate secretion through the infection interface/BIC and action after entry into the rice host cell. Annotate Pia/RGA5–RGA4-dependent effector-triggered immunity as its established recognition outcome, while qualifying its precise susceptibility-promoting mechanism and the physiological roles of its newly identified host interactors as unresolved. (guillen2015structureanalysisuncovers pages 10-13, sornkom2017fluorescentreporteranalysis pages 3-6, cesari2013thericeresistance pages 1-2, maidment2026twofoldsmany pages 6-9, maidment2026twofoldsmany pages 17-18)
References
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(ortiz2017recognitionofthe pages 7-9): Diana Ortiz, Karine de Guillen, Stella Cesari, Véronique Chalvon, Jérome Gracy, André Padilla, and Thomas Kroj. Recognition of the magnaporthe oryzae effector avr-pia by the decoy domain of the rice nlr immune receptor rga5. The Plant Cell, 29:156-168, Jan 2017. URL: https://doi.org/10.1105/tpc.16.00435, doi:10.1105/tpc.16.00435. This article has 168 citations.
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