PMID:10395737

The role of human glutathione S-transferases hGSTA1-1 and hGSTA2-2 in protection against oxidative stress.

GO_REF:0000024

GO reference used by source annotation pipeline

Source annotation pipeline provenance for Gsta2 annotations including glutathione transferase activity.

"GO_REF entry used only to trace the source annotation method; biological support was assessed against UniProt and cached literature where available."

GO_REF:0000033

GO reference used by source annotation pipeline

Source annotation pipeline provenance for Gsta2 annotations including cytosol; glutathione metabolic process; glutathione transferase activity; xenobiotic metabolic process.

"GO_REF entry used only to trace the source annotation method; biological support was assessed against UniProt and cached literature where available."

GO_REF:0000044

GO reference used by source annotation pipeline

Source annotation pipeline provenance for Gsta2 annotations including cytoplasm.

"GO_REF entry used only to trace the source annotation method; biological support was assessed against UniProt and cached literature where available."

GO_REF:0000120

GO reference used by source annotation pipeline

Source annotation pipeline provenance for Gsta2 annotations including glutathione transferase activity.

"GO_REF entry used only to trace the source annotation method; biological support was assessed against UniProt and cached literature where available."

GO_REF:0000121

GO reference used by source annotation pipeline

Source annotation pipeline provenance for Gsta2 annotations including cytosol; epithelial cell differentiation; glutathione transferase activity; mitochondrion; response to bacterium; and 2 other terms.

"GO_REF entry used only to trace the source annotation method; biological support was assessed against UniProt and cached literature where available."

PMID:17112229

Site-specific arylation of rat glutathione s-transferase A1 and A2 by bromobenzene metabolites in vivo

For Gsta2, this publication provides evidence/provenance for direct annotations to glutathione transferase activity; xenobiotic catabolic process and contextual annotations to cytosol; glutathione binding.

"The hepatotoxicity of bromobenzene (BB) derives from its reactive metabolites (epoxides and quinones), which arylate cellular proteins."

PMID:17197701

Electrostatic association of glutathione transferase to the nuclear membrane. Evidence of an enzyme defense barrier at the nuclear envelope

For Gsta2, this publication provides evidence that dinitrosyl-diglutathionyl-iron complexes bind tightly to Alpha class GSTs (including GSTA2-2) in rat hepatocytes, supporting the dinitrosyl-iron complex binding annotation; it also documents perinuclear/nuclear-membrane association of Alpha-class GSTs.

"The discovery that the dinitrosyl-diglutathionyl-iron complex binds tightly to Alpha class GSTs in rat hepatocytes"

file:rat/Gsta2/Gsta2-deep-research-falcon.md

Falcon (Edison Scientific) deep research report: rat Gsta2 (UniProt P04903)

Falcon corroborates the canonical alpha-class GST catalytic activity (EC 2.5.1.18) of rat Gsta2, conjugating reduced glutathione to electrophilic xenobiotic and endogenous substrates and increasing their solubility for excretion.

"Cytosolic glutathione S-transferases (GSTs) are multifunctional detoxification enzymes whose **canonical reaction** is conjugation of **reduced glutathione (GSH)** to **electrophilic xenobiotic and endogenous substrates**, increasing solubility and facilitating downstream excretion (e.g., via mercapturic acid pathways)."
Falcon corroborates the cytosolic localization of rat Gsta2 as an alpha-class GST, distinct from microsomal and mitochondrial GSTs.

"Alpha-class GSTs, including GSTA2-like proteins, belong to the **cytosolic GST family** (distinct from microsomal and mitochondrial GSTs), indicating a **primarily cytosolic intracellular site of action**."
Falcon describes the classic alpha-class "ligandin" non-catalytic activity (high-affinity binding of hydrophobic ligands), providing context for the glutathione/ligand-binding annotations as non-core.

"A classic “**ligandin**” activity is described for alpha-class GST protein(s) in rat liver, exhibiting high affinity binding to **carcinogens, steroid hormones, bilirubin, and dyes**, potentially facilitating intracellular transport/sequestration by tight binding."
Falcon notes rat Gsta2 is an ARE/Nrf2-regulated, oxidative/electrophile-stress-inducible gene, providing the regulatory context that frames the various "response to X" annotations as exposure/phenotype consequences rather than direct molecular functions.

"A specific **ARE sequence** is reported for **rat GSTA2**: **TAAtgGTGACaaaGCA**, and the review provides the ARE **core motif** (e.g., **TGACnnnGC**) and consensus patterns used to identify functional AREs. This supports that rat *Gsta2* is an **ARE-regulated gene**, consistent with oxidative/electrophile-inducible expression."
Falcon explicitly warns against over-interpreting single substrate assays as definitive physiological function for GSTs, supporting a conservative treatment of paralog/species-aggregated substrate claims.

"Authoritative reviews emphasize the multifunctionality of GSTs and warn against over-interpreting one substrate assay as definitive physiological function."
CAVEAT (paralog/species-aggregated substrate claim, NOT imported as rat Gsta2-specific): falcon's benzo[a]pyrene substrate statement is summarized across rodent models and lumps GSTA2 with the M1/P1 paralogs, so it does not establish a rat Gsta2-specific substrate beyond the canonical electrophile-conjugation activity.

"review states B[a]P can **enhance activity of specific GST enzymes such as GSTA2, M1, and P1** while reducing GSTA4 activity"
CAVEAT (alpha-class general activity, NOT imported as a rat Gsta2-specific MF): falcon describes selenium-independent glutathione peroxidase-like activity as a general alpha-class auxiliary function; no rat Gsta2-specific peroxidase annotation is proposed on this basis.

"alpha-class GSTs are described as having **additional activities**, including **selenium-independent glutathione peroxidase-like activity** and reduction of organic hydroperoxides, which links them to oxidative-stress defense mechanisms."

GO_REF:0000108

Automatic assignment of GO terms using logical inference, based on on inter-ontology links