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this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.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.
GSTF6 is the Arabidopsis thaliana gene At1g02930, encoding the phi-class glutathione transferase AtGSTF6. This identification is anchored experimentally: the gstf6-1 insertion disrupts At1g02930, eliminates detectable GSTF6 transcript, and was examined alongside recombinant protein from an AtGSTF6 cDNA. ERD11 and GST1 are documented alternative names. “GSTF3” is an ambiguous historical alias: although one review lists it for At1g02930, current Arabidopsis GST nomenclature also assigns GSTF3 to the different locus At2g02930. The report therefore uses At1g02930/P42760, not an alias alone, to identify its subject. Likewise, TT19/GSTF12 is At5g17220, not GSTF6; findings for a GSTF6 in another plant species cannot be transferred to this protein. (wangwattana2008characterizationofpap1upregulated pages 2-4, dixon2010glutathionetransferases pages 7-9, sylvestregonon2019functionalstructuraland pages 14-16, dixon2010glutathionetransferases pages 5-7)
The supplied UniProt accession P42760 and its GST N-terminal and C-terminal domain annotations are consistent with this locus-verified phi-family assignment. Canonical soluble plant GSTs have an N-terminal thioredoxin-like glutathione-binding region and a C-terminal predominantly helical region contributing to binding other molecules. Phi GSTs belong to the predominantly serine-type GST group, but family architecture alone cannot identify this particular protein’s physiological substrate. (wangwattana2008characterizationofpap1upregulated pages 2-4, sylvestregonon2019functionalstructuraland pages 2-3, sylvestregonon2019functionalstructuraland pages 1-2)
Established reaction: purified recombinant AtGSTF6 catalyzes conjugation of reduced glutathione (GSH) with the artificial electrophile 1-chloro-2,4-dinitrobenzene (CDNB), yielding the dinitrophenyl–glutathione conjugate. In the published assay, its specific activity was 0.87 ± 0.05 nmol min⁻¹ mg⁻¹ protein (n = 3), compared with 0.52 ± 0.02 for TT19 and 383.1 ± 0.1 for the rat-liver GST reference. This is direct evidence for glutathione-transferase activity, not evidence that CDNB is an endogenous substrate or that GSTF6 has unusually high activity on physiological metabolites. The study does not establish a GSTF6-specific Km, kcat, or ranked physiological substrate panel. Wangwattana et al., March 2008, Plant Biotechnology, DOI: 10.5511/plantbiotechnology.25.191. (wangwattana2008characterizationofpap1upregulated pages 2-4, wangwattana2008characterizationofpap1upregulated media 1f06e87f)
Leading proposed endogenous role: glutathione-dependent camalexin formation. Camalexin is a tryptophan-derived defensive metabolite. In the proposed pathway, CYP79B2/B3 convert tryptophan toward indole-3-acetaldoxime; CYP71A12/A13 generate indole-3-acetonitrile (IAN) and participate in its further activation; a GSH-derived intermediate, conventionally called GS-IAN, is subsequently processed by γ-glutamyl peptidases GGP1/GGP3 toward cysteine-containing intermediates and ultimately camalexin. GS-IAN has been identified against a chemically synthesized standard in Arabidopsis GGP-deficient plants, providing strong evidence for the GSH-containing pathway intermediate, but not identifying GSTF6 as its unique forming enzyme. Geu-Flores et al., June 2011, The Plant Cell, DOI: 10.1105/tpc.111.083998; Mucha et al., September 2019, The Plant Cell, DOI: 10.1105/tpc.19.00403. (geuflores2011cytosolicγglutamylpeptidases pages 7-8, mucha2019theformationof pages 2-3)
GSTF6 is implicated genetically: its abundance rose with GSTF2 and GSTF7 during experimentally induced camalexin production; GSTF6 overexpression increased camalexin, whereas a gstf6 single mutant had a small but significant decrease—described in a subsequent primary-paper discussion as approximately 20%. These observations make a contributory role credible, not a requirement for all camalexin formation. Su et al., 2011, The Plant Cell, DOI: 10.1105/tpc.110.079145, as evaluated by Czerniawski and Bednarek, November 2018, Frontiers in Plant Science, DOI: 10.3389/fpls.2018.01639. (czerniawski2018glutathionestransferasesin pages 6-7, pislewskabednarek2018glutathionetransferaseu13 pages 4-6)
Crucial substrate qualification: descriptions of GSTF6 simply catalyzing “IAN + GSH → GS-IAN” should be read as a pathway proposal, not a demonstrated GSTF6-specific elementary reaction. CYP71A12/A13 can further activate IAN to reactive derivatives—including α-hydroxy-IAN/dehydro-IAN or a proposed indole cyanohydrin—that can add GSH spontaneously. The exact GSTF6 physiological electrophile, its substrate preference over those candidates, and the extent to which enzyme catalysis accelerates their reaction in planta remain unresolved. Czerniawski and Bednarek, 2018; Micic et al., September 2024, Philosophical Transactions of the Royal Society B, DOI: 10.1098/rstb.2023.0365. (czerniawski2018glutathionestransferasesin pages 6-7, micic2024overlookedandmisunderstood pages 8-9)
Several results constrain a dedicated-enzyme annotation. After silver-nitrate induction, camalexin did not differ significantly from wild type in a gstf2 gstf3 gstf6 triple knockout or a four-gene knockdown additionally targeting gstf7. Adding GSTF6 to a camalexin pathway reconstructed in Nicotiana benthamiana likewise did not increase its output. In a 2019 engineered-yeast screen, 41 of 54 tested Arabidopsis GSTs supported GS-IAN formation in the presence of CYP71A13. Such findings point to enzyme redundancy, spontaneous chemistry, host-dependent effects, or spatial organization, rather than unique GSTF6 substrate specificity. Mucha et al., 2019; Micic et al., 2024. (mucha2019theformationof pages 2-3, mucha2019theformationof pages 7-8, micic2024overlookedandmisunderstood pages 8-9)
The distinction from anthocyanin transport is especially well tested. Although GSTF6 transcript abundance was reported 17.9-fold higher in PAP1-overexpressing plants, gstf6-1 showed no significant change in anthocyanin abundance or pattern under the tested high-sucrose conditions; loss of TT19/GSTF12, in contrast, reduced anthocyanins 96%. Direct comparison found a cyanidin-3-O-glucoside binding constant 8.4-fold higher for TT19 than GSTF6, and detected no GSH-conjugated cyanidin or cyanidin-3-O-glucoside in that assay. GSTF6 should therefore not be annotated as the demonstrated TT19-like vacuolar anthocyanin carrier. Wangwattana et al., 2008; Sun et al., March 2012, Molecular Plant, DOI: 10.1093/mp/ssr110. (wangwattana2008characterizationofpap1upregulated pages 2-4, sun2012arabidopsistt19functions pages 6-9, wangwattana2008characterizationofpap1upregulated pages 1-2)
The evidence and its limitations are summarized below; the published CDNB activity and phi-family assignment were also checked against the study’s cropped assay table and phylogeny. (wangwattana2008characterizationofpap1upregulated media 1f06e87f, wangwattana2008characterizationofpap1upregulated media ba572d39)
| Claim/function | Evidence and quantitative findings | Inference/limitations | Primary reference (year; DOI) |
|---|---|---|---|
| Identity and enzyme class | Recombinant and knockout studies identify the target as Arabidopsis thaliana AtGSTF6, locus At1g02930; phylogenetic analysis places it in the plant phi GST class. The canonical family architecture comprises an N-terminal thioredoxin-like GSH-binding domain and a C-terminal all-helical hydrophobic-substrate-binding domain. (wangwattana2008characterizationofpap1upregulated pages 2-4, sylvestregonon2019functionalstructuraland pages 1-2) | Assignment is secure at the locus level. Historical nomenclature is hazardous: GSTF3 at At2g02930 is a separate locus, so results for that protein must not be assigned to P42760. (dixon2010glutathionetransferases pages 7-9, dixon2010glutathionetransferases pages 5-7) | Wangwattana et al. (2008); 10.5511/plantbiotechnology.25.191 |
| Demonstrated catalytic activity with a model substrate | Purified AtGSTF6 catalyzed conjugation of GSH with 1-chloro-2,4-dinitrobenzene (CDNB) to form DNP-GS, with reported specific activity 0.87 ± 0.05 nmol min⁻¹ mg⁻¹ protein (n=3), versus 0.52 ± 0.02 for TT19 under the same conditions. (wangwattana2008characterizationofpap1upregulated pages 2-4, wangwattana2008characterizationofpap1upregulated media 1f06e87f) | Direct evidence that the protein is a functional GST, but CDNB is an artificial broad-spectrum substrate. No Kₘ, kcat, catalytic efficiency, or validated endogenous substrate was reported; activity was extremely weak relative to rat-liver GST (383.1 ± 0.1 in the same assay). | Wangwattana et al. (2008); 10.5511/plantbiotechnology.25.191 |
| Contribution to camalexin biosynthesis | GSTF6 accumulated with GSTF2 and GSTF7 during MAPKK9-driven camalexin production. GSTF6 overexpression in that background significantly increased camalexin, whereas a single gstf6 knockout caused only a slight significant reduction—reported in a later account as approximately 20%. (czerniawski2018glutathionestransferasesin pages 6-7, pislewskabednarek2018glutathionetransferaseu13 pages 4-6) | Supports a contributory, redundant role rather than an indispensable dedicated enzyme. The often-stated reaction “IAN + GSH → GS-IAN” is oversimplified: CYP71A12/A13 likely activate IAN to reactive α-hydroxy-IAN/dehydro-IAN or indole cyanohydrin, which can conjugate spontaneously with GSH. Direct GSTF6 kinetics for the physiological intermediate have not been established. (czerniawski2018glutathionestransferasesin pages 6-7, micic2024overlookedandmisunderstood pages 8-9) | Su et al. (2011); 10.1105/tpc.110.079145 |
| Counterevidence and redundancy in camalexin formation | Camalexin was not significantly altered in an gstf2 gstf3 gstf6 triple knockout or an gstf2 gstf3 gstf6 gstf7 knockdown after AgNO₃ induction. Adding GSTF6 to a reconstituted Nicotiana benthamiana pathway likewise did not increase camalexin. A 2019 screen found 41 of 54 Arabidopsis GSTs capable of supporting GS-IAN formation with CYP71A13 in engineered yeast. (mucha2019theformationof pages 2-3, czerniawski2018glutathionestransferasesin pages 6-7, mucha2019theformationof pages 7-8) | Strong evidence against strict GSTF6 substrate exclusivity. Results are compatible with broad GST redundancy, spontaneous GSH addition, host GST substitution, and spatial recruitment rather than unique catalytic specificity. | Mucha et al. (2019); 10.1105/tpc.19.00403; Møldrup et al. (2013); 10.1016/j.jbiotec.2013.06.013 |
| Not required for anthocyanin accumulation | Under high-sucrose conditions, loss of TT19/GSTF12 reduced anthocyanin accumulation by 96%, whereas the transcript-null gstf6-1 mutant showed no significant change in total anthocyanin level, anthocyanin pattern, or broader flavonoid profile. (wangwattana2008characterizationofpap1upregulated pages 2-4, wangwattana2008characterizationofpap1upregulated pages 4-6) | Demonstrates that GSTF6 does not substitute for TT19 in the tested anthocyanin-storage pathway. PAP1-induced GSTF6 expression therefore does not by itself establish an anthocyanin transport function. | Wangwattana et al. (2008); 10.5511/plantbiotechnology.25.191 |
| Weak anthocyanin binding; no detected pigment glutathionylation | TT19 bound cyanidin-3-O-glucoside (C3G) with a binding constant 8.4-fold higher than GSTF6 and increased cyanidin solubility far more strongly. Neither protein produced detectable GSH-conjugated cyanidin or C3G in the assay. (sun2012arabidopsistt19functions pages 6-9) | GSTF6 can serve as a comparative low-affinity control, but these data do not establish a physiologically relevant pigment-ligandin function. They also distinguish noncovalent ligand binding from GST catalysis. | Sun et al. (2012); 10.1093/mp/ssr110 |
| Probable cellular site of action | GSTF6 lacks a reported targeting peptide and belongs to a predominantly soluble GST class; the relevant GSH-conjugate-processing enzymes GGP1/GGP3 were experimentally localized to the cytosol, while camalexin-pathway P450s reside in the ER with catalytic domains facing the cytosol. (dixon2010glutathionetransferases pages 5-7, geuflores2011cytosolicγglutamylpeptidases pages 7-8, mucha2019theformationof pages 2-3) | A cytosolic or cytosolic face-of-ER site is mechanistically plausible, but GSTF6-specific GFP localization, membrane fractionation, or organelle-targeting evidence was not identified. Localization measured for TT19, GSTU4, GSTU2, GGP1/GGP3, or P450s must not be transferred to GSTF6. (mucha2019theformationof pages 6-7, dixon2010glutathionetransferases pages 5-7) | Geu-Flores et al. (2011); 10.1105/tpc.111.083998; Mucha et al. (2019); 10.1105/tpc.19.00403 |
| Stress and immune-response association | GSTF6 is dehydration/stress inducible, and combined RNAi against GSTF6/7/9/10 caused subtle metabolic changes consistent with reduced oxidative-stress tolerance but no overt phenotype. Independent expression mining reported approximately 10.38-fold GSTF6 induction across salt/osmotic/drought-stress datasets. (dixon2010glutathionetransferases pages 10-11, seok2020investigationofa pages 8-11) | These are expression and multi-gene perturbation data, not proof that GSTF6 directly detoxifies ROS or a particular electrophile. Individual-gene causality and endogenous stress substrate remain unresolved. | Sappl et al. (2009), as summarized by Dixon & Edwards (2010); 10.1199/tab.0131; Seok et al. (2020); 10.3390/ijms21051595 |
| 2024 spatial host–microbiome evidence | Spatial metatranscriptomics of outdoor-grown Arabidopsis leaves identified GSTF6/AT1G02930 among immune-related, general non-self-response genes associated with microbial infection at micrometer-scale tissue resolution. (saarenpaa2024spatialmetatranscriptomicsresolves pages 9-10, saarenpaa2024spatialmetatranscriptomicsresolves pages 8-9) | This is a spatial RNA association after prolonged natural host–microbiota interaction—not protein localization, enzyme activity, direct microbial binding, or evidence of causality. The available passage does not justify a GSTF6-specific causal relationship with Pseudomonas. | Saarenpää et al. (2024; online 2023); 10.1038/s41587-023-01979-2 |
| Current evidence-weighted conclusion | A 2024 authoritative review concludes that GSTF6 is associated with camalexin production, but its knockout effect is slight and heterologous complementation is negative; endogenous GS-conjugates, broad GST promiscuity, spontaneous GSH reactions, and redundancy complicate assignment. (micic2024overlookedandmisunderstood pages 8-9) | High confidence: phi-class GSH-transferase capable of CDNB conjugation. Moderate confidence: redundant contributor to stress-induced camalexin metabolism. Low confidence: exclusive GS-IAN-forming enzyme, anthocyanin carrier, or any precise GSTF6-specific subcellular compartment. | Micic et al. (2024); 10.1098/rstb.2023.0365 |
Table: Evidence-strength summary for Arabidopsis GSTF6 specifically anchored to At1g02930/P42760. It separates direct biochemical and genetic results from pathway inference, redundancy, and localization claims.
Where does GSTF6 act? A soluble cytosolic site, potentially near the cytosolic face of the endoplasmic reticulum (ER) during camalexin synthesis, is the most defensible inference, not an experimentally established GSTF6-specific localization. GST proteins commonly occur in the cytosol; GGP1/GGP3 fusion proteins have been localized there, while camalexin-pathway P450 enzymes occupy the ER and expose their catalytic machinery toward the cytosolic reaction space. No compelling GSTF6-specific fluorescence-localization or organelle-fractionation result was identified here. In particular, the reported cytosol/tonoplast localization of TT19 and physical association of GSTU4, another GST, with camalexin P450s do not demonstrate either location or interaction for GSTF6. Extracellular action is not established. Dixon and Edwards, January 2010, The Arabidopsis Book, DOI: 10.1199/tab.0131; Geu-Flores et al., 2011; Mucha et al., 2019. (dixon2010glutathionetransferases pages 5-7, geuflores2011cytosolicγglutamylpeptidases pages 7-8, mucha2019theformationof pages 2-3, mucha2019theformationof pages 6-7)
Signaling and stress: GSTF6 expression and abundance respond in contexts involving defense and environmental stress, but this does not make GSTF6 itself an established signaling receptor or kinase. Its association with camalexin connects it to inducible pathogen-defense metabolism downstream of stress-responsive MAPK activation. Combined suppression of GSTF6, GSTF7, GSTF9, and GSTF10 caused subtle stress-related metabolite changes without an overt phenotype; because four genes were reduced together, these data cannot assign an oxidative-stress substrate specifically to GSTF6. A separate transcriptomic analysis identified At1g02930 among stress-associated genes and reported an approximately 10.377-fold expression-change statistic in its stress-response analysis, but did not establish GSTF6-dependent salt tolerance. Dixon and Edwards, 2010; Seok et al., February 2020, International Journal of Molecular Sciences, DOI: 10.3390/ijms21051595. (dixon2010glutathionetransferases pages 10-11, seok2020investigationofa pages 8-11)
2024 interpretation and application. A recent expert review specifically warns that broad GST substrate promiscuity, rapid processing or spontaneous formation of GSH adducts, and overlapping GST activities can make a single knockout look nearly normal. Its assessment of GSTF6 emphasizes the mismatch between increased camalexin after overexpression, the small knockout effect, and the negative Nicotiana reconstruction result. Thus the practical use of At1g02930 today is as a locus-specific candidate in Arabidopsis defense-metabolite and stress-response experiments, not as a validated enzyme for a uniquely specified natural substrate or a deployed crop-engineering intervention. Micic et al., September 2024. (micic2024overlookedandmisunderstood pages 8-9)
In an independent 2024 application of spatial metatranscriptomics to outdoor-grown Arabidopsis leaves, GSTF6/AT1G02930 appeared among immune-related general non-self-response genes associated with microbial exposure. This is useful spatial host-RNA evidence for defense responsiveness, but neither a measurement of GSTF6 protein location nor proof that GSTF6 acts directly on a microbe or its metabolites. Saarenpää et al., Nature Biotechnology 42, 1384–1393 (2024), DOI: 10.1038/s41587-023-01979-2. (saarenpaa2024spatialmetatranscriptomicsresolves pages 9-10, saarenpaa2024spatialmetatranscriptomicsresolves pages 8-9)
Bottom-line annotation: AtGSTF6/P42760 is a phi-class, GSH-dependent transferase with experimentally demonstrated activity on CDNB and genetic, but non-exclusive, support for participation in camalexin-producing defense metabolism. Its precise endogenous substrate, substrate specificity, catalytic necessity in GS-IAN formation, and GSTF6-specific subcellular position remain unresolved. Assigning it TT19’s anthocyanin-transport function, a uniquely essential camalexin reaction, or another organism’s GSTF6 properties would overstate the evidence. (wangwattana2008characterizationofpap1upregulated pages 2-4, micic2024overlookedandmisunderstood pages 8-9, czerniawski2018glutathionestransferasesin pages 6-7, mucha2019theformationof pages 2-3, dixon2010glutathionetransferases pages 5-7)
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