ERF094, better known as ORA59 (OCTADECANOID-RESPONSIVE ARABIDOPSIS AP2/ERF 59), is a nuclear group IX AP2/ERF-domain transcription factor that integrates jasmonic acid (JA) and ethylene (ET) signals in defense against necrotrophic pathogens. Its single AP2/ERF domain binds GCC-box (GCCGCC) elements and, in an ethylene-favoured manner, ERELEE4-type ethylene-responsive elements in target promoters; ORA59 activates transcription through an EDLL motif and the Mediator subunit MED25. It is the key activator of PLANT DEFENSIN1.2 (PDF1.2), binding two GCC boxes in its promoter, and also activates HEL, basic chitinase, GLIP1 and AtACT, the last driving biosynthesis of antimicrobial hydroxycinnamic acid amides. ORA59 expression is induced by JA and ET in a COI1- and EIN2-dependent manner, and the protein accumulates in the nucleus in response to ethylene, where it interacts with RAP2.3 and EIN3. ORA59 acts downstream of COI1 as the terminal regulator of a subset of JA/ET-responsive genes; overexpression confers resistance to Botrytis cinerea while silencing increases susceptibility. Salicylic acid antagonizes this branch by reducing ORA59 protein levels through EIN3-dependent 26S proteasome degradation.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0000976 transcription cis-regulatory region binding | IBA GO_REF:0000033 | ACCEPT | Summary: ORA59 binds GCC-box (and ERE/ERELEE4) cis-regulatory elements in target promoters such as PDF1.2 and AtACT, shown by EMSA, transient transactivation and ChIP. The IBA from the group IX ERF clade is consistent with direct experimental evidence on ORA59 itself. Reason: Sequence-specific promoter binding is directly demonstrated for ORA59 in vitro and in vivo; the PAINT node placement (AP2/ERF ERF clade) is appropriate and the term is at a sensible level of specificity. Supporting Evidence: PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes PMID:21246258 Using the chromatin immunoprecipitation technique we were able to show that ORA59 bound the PDF1.2 promoter in vivo PMID:34890461 We found that ORA59 regulates JA/ET-responsive genes through direct binding to these elements in gene promoters |
| GO:0003677 DNA binding | IEA GO_REF:0000002 | MODIFY | Summary: Generic DNA binding from the DNA-binding domain superfamily signature (IPR016177). Correct but uninformative; ORA59 binds specific cis-regulatory elements. Reason: The AP2/ERF domain confers sequence-specific binding to GCC-box/ERE promoter elements; transcription cis-regulatory region binding is the informative, experimentally supported term. Proposed replacements: transcription cis-regulatory region binding Supporting Evidence: PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0003677 DNA binding | TAS PMID:10715325 Arabidopsis ethylene-responsive element binding factors act ... | MODIFY | Summary: TAS from Fujimoto et al. 2000, which characterized AtERF1-5 GCC-box binding; the statement applies to the ERF family and ORA59 was later shown directly to bind GCC boxes. Generic DNA binding is uninformative. Reason: Biologically correct but too general; ORA59 binds specific promoter cis-elements (GCC box, ERELEE4). Replace with transcription cis-regulatory region binding. Proposed replacements: transcription cis-regulatory region binding Supporting Evidence: PMID:10715325 all five displayed GCC box-specific binding activity PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0003700 DNA-binding transcription factor activity | IBA GO_REF:0000033 | ACCEPT | Summary: ORA59 is a DNA-binding transcription factor of the ERF subfamily. Phylogenetic inference agrees with direct evidence that ORA59 binds and transactivates target promoters. Reason: Core molecular function, supported by direct binding, transactivation and ChIP evidence for ORA59. Supporting Evidence: PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes PMID:18467450 only ORA59 and ERF1 were able to activate PDF1.2 gene expression, in contrast to the related proteins AtERF1 and AtERF2 |
| GO:0003700 DNA-binding transcription factor activity | IEA GO_REF:0000002 | ACCEPT | Summary: InterPro AP2/ERF domain mapping to DNA-binding transcription factor activity; correct for ORA59. Reason: Consistent with experimental evidence that ORA59 is a sequence-specific transcriptional activator. Supporting Evidence: PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes file:ARATH/ERF094/ERF094-deep-research-falcon.md ORA59 is a sequence-specific **transcriptional activator**, not an enzyme or transporter |
| GO:0003700 DNA-binding transcription factor activity | ISS PMID:11118137 Arabidopsis transcription factors: genome-wide comparative a... | ACCEPT | Summary: ISS from the Riechmann et al. 2000 genome-wide transcription factor survey, assigning AP2/ERF proteins TF activity by domain similarity. Later confirmed experimentally for ORA59. Reason: Correct; independently confirmed by direct binding and transactivation assays on ORA59. Supporting Evidence: PMID:11118137 Arabidopsis dedicates over 5% of its genome to code for more than 1500 transcription factors PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0003700 DNA-binding transcription factor activity | TAS PMID:10715325 Arabidopsis ethylene-responsive element binding factors act ... | ACCEPT | Summary: TAS from an ERF family paper (AtERF1-5) establishing that ERFs act as GCC-box transcription factors. Correct for ORA59, which is a GCC-box activator. Reason: Family-level statement, but biologically correct and confirmed for ORA59 itself. Supporting Evidence: PMID:10715325 we conclude that AtERFs are factors that respond to extracellular signals to modulate GCC box-mediated gene expression positively or negatively PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0003700 DNA-binding transcription factor activity | TAS PMID:9687012 The AP2/EREBP family of plant transcription factors. | ACCEPT | Summary: TAS from a 1998 review of the AP2/EREBP family. Family-level assignment of transcription factor activity, correct for ORA59. Reason: Correct core function; experimentally confirmed for ORA59. Supporting Evidence: PMID:9687012 AP2 (APETALA2) and EREBPs (ethylene-responsive element binding proteins) are the prototypic members of a family of transcription factors unique to plants PMID:18467450 only ORA59 and ERF1 were able to activate PDF1.2 gene expression, in contrast to the related proteins AtERF1 and AtERF2 |
| GO:0005634 nucleus | IBA GO_REF:0000033 | ACCEPT | Summary: ORA59 acts in the nucleus; fluorescent fusions show ethylene-dependent nuclear accumulation and nuclear interaction with RAP2.3 and EIN3. Reason: Nuclear site of action supported by localization data for ORA59 and by its ChIP-demonstrated promoter occupancy. Supporting Evidence: PMID:30510560 ORA59 and RAP2.3 interacted in the nucleus and showed ethylene-dependent nuclear localization PMID:28168848 Co-infiltration assays revealed nuclear co-localization of ORA59 and EIN3 PMID:21246258 Using the chromatin immunoprecipitation technique we were able to show that ORA59 bound the PDF1.2 promoter in vivo |
| GO:0005634 nucleus | IEA GO_REF:0000044 | ACCEPT | Summary: ORA59 acts in the nucleus; fluorescent fusions show ethylene-dependent nuclear accumulation and nuclear interaction with RAP2.3 and EIN3. Reason: UniProt subcellular location mapping; consistent with experimental localization. Supporting Evidence: PMID:30510560 ORA59 and RAP2.3 interacted in the nucleus and showed ethylene-dependent nuclear localization |
| GO:0005634 nucleus | ISM GO_REF:0000122 | ACCEPT | Summary: ORA59 acts in the nucleus; fluorescent fusions show ethylene-dependent nuclear accumulation and nuclear interaction with RAP2.3 and EIN3. Reason: AtSubP prediction agrees with experimental nuclear localization. Supporting Evidence: PMID:30510560 ORA59 and RAP2.3 interacted in the nucleus and showed ethylene-dependent nuclear localization PMID:28168848 Co-infiltration assays revealed nuclear co-localization of ORA59 and EIN3 |
| GO:0006355 regulation of DNA-templated transcription | IBA GO_REF:0000033 | ACCEPT | Summary: ORA59 regulates transcription of a subset of JA/ET-responsive defense genes (PDF1.2, HEL, ChiB, AtACT, GLIP1). Reason: Correct; ORA59 is a positive regulator (activator), so positive regulation of DNA-templated transcription is a more precise child, but the IBA parent term is acceptable as the phylogenetically inherited process. Supporting Evidence: PMID:18467450 only ORA59 and ERF1 were able to activate PDF1.2 gene expression, in contrast to the related proteins AtERF1 and AtERF2 PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0006355 regulation of DNA-templated transcription | IEA GO_REF:0000002 | ACCEPT | Summary: InterPro AP2/ERF domain mapping to regulation of transcription; correct. Reason: Consistent with the experimentally demonstrated transcriptional activator role. Supporting Evidence: PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0006355 regulation of DNA-templated transcription | TAS PMID:10715325 Arabidopsis ethylene-responsive element binding factors act ... | ACCEPT | Summary: TAS from Fujimoto et al. 2000 (ERF family, activators and repressors). ORA59 specifically behaves as an activator of GCC-box-dependent transcription. Reason: Correct at this level and consistent with the IBA/IEA rows for the same term. ORA59 specifically acts as an activator (activates the PDF1.2 promoter ~17-fold in protoplasts), a refinement captured by the DNA-binding transcription activator activity MF. Supporting Evidence: PMID:18467450 GUS reporter gene activity was increased about 17- and 10-fold upon cotransformation with ORA59 and ERF1 effector plasmids PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes |
| GO:0009723 response to ethylene | IEP PMID:18467450 The AP2/ERF domain transcription factor ORA59 integrates jas... | KEEP AS NON CORE | Summary: ORA59 transcript is induced by ethephon, an effect that requires EIN2 and COI1. Reason: Expression-level response correctly captured by IEP; the core role of ORA59 is as a transcriptional effector of ethylene signalling (captured by ethylene-activated signaling pathway). Supporting Evidence: PMID:18467450 the induction of ORA59 gene expression by JA, ethylene, or a combination of both requires intact JA as well as ethylene signaling pathways for full responsiveness |
| GO:0009753 response to jasmonic acid | IEP PMID:18467450 The AP2/ERF domain transcription factor ORA59 integrates jas... | KEEP AS NON CORE | Summary: ORA59 transcript is rapidly and COI1-dependently induced by JA (it was isolated as an octadecanoid-responsive ERF). Reason: Valid expression response; the mechanistic role is as a JA-signalling transcriptional effector. Supporting Evidence: PMID:18467450 the induction of ORA59 gene expression by JA, ethylene, or a combination of both requires intact JA as well as ethylene signaling pathways for full responsiveness |
| GO:0009861 jasmonic acid and ethylene-dependent systemic resistance | IMP PMID:18467450 The AP2/ERF domain transcription factor ORA59 integrates jas... | MODIFY | Summary: Pre et al. 2008 showed that ORA59 overexpression increases and RNAi silencing decreases resistance to Botrytis cinerea in inoculated leaves. The assay measured local resistance; no systemic (ISR-type) resistance assay was performed, although ORA59 transcript was induced in distal leaves. Reason: GO:0009861 describes broad-spectrum systemic resistance (ISR). The IMP evidence is local resistance to a necrotrophic fungus, and ORA59 silencing did not affect basal resistance to Alternaria brassicicola, so a broad systemic claim is not supported. ORA59 contributes directly by transcribing antifungal effector genes (PDF1.2, HEL, ChiB), so defense response to fungus is the appropriate process term. Proposed replacements: defense response to fungus Supporting Evidence: PMID:18467450 overexpression of ORA59 caused increased resistance against the fungus Botrytis cinerea, whereas ORA59-silenced plants were more susceptible PMID:18467450 Mature leaves of soil-grown wild-type plants, JA-insensitive coi1-1 mutant plants, and transgenic 35S: ORA59 and RNAi- ORA59 plants at comparable developmental stages were inoculated at the same time with B. cinerea PMID:18467450 the level of basal resistance against A. brassicicola in ORA59 -silenced plants did not differ from that of wild-type plants |
| GO:0009873 ethylene-activated signaling pathway | IEA GO_REF:0000002 | ACCEPT | Summary: ORA59 is a terminal transcriptional component of ethylene signalling: its function as integrator requires ethylene input, ethylene promotes its nuclear accumulation and its ET-favoured binding to ERELEE4 elements. Reason: Participation as the transcriptional effector of the pathway is directly supported for ORA59. Supporting Evidence: PMID:18467450 Our results demonstrate that ORA59 is an essential integrator of the JA and ethylene signal transduction pathways PMID:30510560 ORA59 and RAP2.3 interacted in the nucleus and showed ethylene-dependent nuclear localization |
| GO:0009873 ethylene-activated signaling pathway | TAS PMID:9687012 The AP2/EREBP family of plant transcription factors. | ACCEPT | Summary: TAS from a family review; for ORA59 the ethylene-signalling role is experimentally established (integrator of JA/ET; positive regulator of the triple response). Reason: Correct; supported by primary data on ORA59. Supporting Evidence: PMID:18467450 Our results demonstrate that ORA59 is an essential integrator of the JA and ethylene signal transduction pathways PMID:30510560 ORA59 played a positive role in ethylene-regulated responses |
| GO:0001216 DNA-binding transcription activator activity | IDA PMID:21246258 Two GCC boxes and AP2/ERF-domain transcription factor ORA59 ... | NEW | Summary: ORA59 binds GCC boxes in the PDF1.2 promoter in vitro and in vivo and transactivates the promoter through them; it likewise activates AtACT and GLIP1 promoters. It is an activator, not a repressor (no EAR motif; EDLL activation motif). Reason: More precise MF than GO:0003700, directly supported by binding plus transactivation data on ORA59. Same-role comparators (sequence-specific activating TFs) are routinely annotated to this term. Supporting Evidence: PMID:21246258 ORA59 bound in vitro to these GCC boxes and trans-activated the PDF1.2 promoter in transient assays via these two boxes PMID:21246258 Using the chromatin immunoprecipitation technique we were able to show that ORA59 bound the PDF1.2 promoter in vivo PMID:29752755 two GCC-boxes function equivalently for trans-activation by ORA59 in Arabidopsis protoplasts |
| GO:0009867 jasmonic acid mediated signaling pathway | IMP PMID:18467450 The AP2/ERF domain transcription factor ORA59 integrates jas... | NEW | Summary: ORA59 is the terminal transcriptional component of the ERF branch of JA signalling: it acts downstream of COI1 and is required for JA-induced expression of PDF1.2 and HEL. Reason: Participation test: ORA59 performs a step of the pathway (the transcriptional output step) rather than being a target of it; ORA59 overexpression activates PDF1.2/HEL independently of COI1, and RNAi abolishes JA-induced expression. This parallels the existing ethylene-activated signaling pathway annotation and the treatment of MYC2 as the effector of the MYC branch. Supporting Evidence: PMID:18467450 ORA59 is the terminal integrator of the JA and ethylene signal inputs for a subset of JA- and ethylene-responsive genes, including PDF1.2 and HEL PMID:18467450 Induction of the PDF1.2 and HEL genes in response to 8 h of JA treatment was severely compromised in those ORA59 -silenced lines with undetectable ORA59 mRNA |
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Download this section (compressed HTML)Q: Which kinase(s) phosphorylate ORA59 in response to JA versus ethylene, and which phosphosites switch its preference between GCC-box and ERELEE4 elements?
Q: To what extent are ORA59, ERF1 and AtERF15 redundant for PDF1.2 expression and Botrytis resistance in stable knockout combinations?
Q: Does ORA59 interact with JAZ repressors directly, or is its JA dependence entirely transcriptional and via EIN3/EIL1?
Experiment: Genome-wide ChIP-seq/DAP-seq of ORA59 under JA, ACC and JA+ACC treatment to separate direct targets from the larger ORA59-dependent transcriptome.
Experiment: Botrytis infection assays on ora59 erf1 erf15 higher-order CRISPR mutants, including systemic resistance assays to test any role in JA/ET-dependent systemic resistance.
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