| Topic | Key finding | Evidence type | System | Quantitative/statistical details (if any) | Primary citation (DOI URL + year) | PaperQA context citation ID |
|---|---|---|---|---|---|---|
| Function / family context | ABCF2 belongs to the ABC-F family, whose members are soluble ABC ATPases rather than membrane transporters. Family-level reviews state ABC-F proteins lack transmembrane domains, bind the ribosomal E site, and act as translation factors that modulate the peptidyl-transferase center and/or stalled-ribosome states; this supports annotation of human ABCF2 as a non-TMD ATPase with likely translation-related function, but not as a classical transporter. | Review | Cross-species ABC-F family; includes human ABCF paralogs | No ABCF2-specific activity constant reported; qualitative consensus that ABC-F proteins are cytosolic/non-membrane and ribosome-associated | Fostier et al., 2021, https://doi.org/10.1002/1873-3468.13984; Ousalem et al., 2019, https://doi.org/10.1016/j.resmic.2019.09.005; Saha et al., 2023, https://doi.org/10.29011/2577-1515.100225 | (pqac-00000001, pqac-00000002, pqac-00000004, pqac-00000005, pqac-00000006, pqac-00000007) |
| Localization / structural inference | Family-level structural summaries indicate ABC-F proteins are cytosolic and bind ribosomes in E-site geometry via tandem ABC domains plus the PtIM/ABC_tran_Xtn linker. For ABCF2 specifically, direct ribosome-binding evidence was not retrieved here, so subcellular localization is best described as inferred cytoplasmic/ribosome-associated rather than definitively proven in the available primary ABCF2 literature. | Review / inference | ABC-F proteins broadly; human ABCF2 by family inference | Qualitative only; no direct ABCF2 localization percentages reported in these family reviews | Fostier et al., 2021, https://doi.org/10.1002/1873-3468.13984; Saha et al., 2023, https://doi.org/10.29011/2577-1515.100225 | (pqac-00000001, pqac-00000002, pqac-00000005, pqac-00000007, pqac-00000008) |
| Pathway / apoptosis / bacterial infection | The strongest direct functional evidence for human ABCF2 is from EPEC infection studies: EspF physically binds ABCF2, lowers host ABCF2 levels, and ABCF2 depletion sensitizes cells to mitochondrial apoptosis. These data support ABCF2 as an anti-apoptotic host factor whose inhibition promotes caspase-9/-3 activation during infection. | Primary research | Human HeLa and Caco-2 cells infected with enteropathogenic E. coli | ABCF2 peptides identified in EspF pull-down (~12.4% coverage); infection experiments used MOI 100:1 for 3 h; ABCF2 siRNA increased cleaved caspase-9 ~4-fold and increased staurosporine-induced cleaved caspase-3 by ~50% versus control | Nougayrède et al., 2007, https://doi.org/10.1111/j.1462-5822.2006.00820.x | (pqac-00000011, pqac-00000012, pqac-00000013, pqac-00000015, pqac-00000017, pqac-00000029) |
| Localization in infection context | In the EspF study, ABCF2 was described as primarily cytoplasmic with partial mitochondrial localization, while EspF is type-III-secreted into host cells and traffics to mitochondria. This supports a model in which ABCF2 can influence intrinsic/mitochondrial apoptosis during bacterial pathogenesis. | Primary research | Human epithelial cells during EPEC infection | Qualitative localization; no compartment percentages given in retrieved text | Nougayrède et al., 2007, https://doi.org/10.1111/j.1462-5822.2006.00820.x | (pqac-00000013) |
| Disease / pathogen-host interaction | A 2024 preprint proposed ABCF2 as a host adhesion receptor/factor for Pasteurella multocida. TurboID proximity labeling, co-IP, BLI, overexpression, knockdown, and knockout experiments all supported a role for ABCF2 in bacterial adhesion/invasion, extending ABCF2 biology beyond apoptosis to host–pathogen interface functions. | Preprint | Human A549, HEK293T and porcine NPTr cells; mouse infection model | TurboID labeling with 50 μM biotin for 15 min; infections commonly at MOI 200; gentamicin protection 100 μg/mL for 1 h; three replicates; BLI used ABCF2 at 18.75–600 nM | Wang et al., 2024, https://doi.org/10.1101/2024.12.03.626657 | (pqac-00000020, pqac-00000021, pqac-00000022, pqac-00000023, pqac-00000025, pqac-00000030) |
| Pathway / signaling | In the same P. multocida preprint, infection-induced ABCF2 upregulation was linked to p38 MAPK and NF-κB signaling, and ABCF2 was connected to p53-dependent apoptosis. Thus, ABCF2 was placed downstream of infection-triggered stress/inflammatory signaling and upstream of apoptosis-related outputs. | Preprint | Cell culture infection models | P-P65 increased at 6 hpi; BAY11-7082 used at 5 μM; BIRB796 at 40 μM; pifithrin-α at 40 μM; p38 assayed over 0–20 h and NF-κB over 1–12 h | Wang et al., 2024, https://doi.org/10.1101/2024.12.03.626657 | (pqac-00000020, pqac-00000023, pqac-00000024, pqac-00000025, pqac-00000027, pqac-00000030, pqac-00000031) |
| GCN1/GCN2 / integrated stress response context | Recent review evidence does not support a direct ABCF2 role as the mammalian GCN20-like factor in amino-acid-starvation signaling. Instead, ABCF3 was described as more similar to yeast GCN20, whereas ABCF2 was explicitly noted as less similar and not assigned the GCN20-ortholog function. | Review | Mammalian/yeast comparative signaling context | Qualitative statement only; no effect size reported for ABCF2 | Tatara et al., 2024, https://doi.org/10.3390/ijms25052998 | (pqac-00000019) |
| Disease associations / database summary | Open Targets links ABCF2 to several diseases/traits, but the scores are modest and do not establish mechanism. Reported associations include renal cell carcinoma, multiple myeloma, smoking initiation, neurodegenerative disease, and abnormality of the skeletal system; each listed disease had evidence_size = 3 in the retrieved output. | Database | Human genetic/biomedical evidence aggregation | Scores: renal cell carcinoma 0.0647; multiple myeloma 0.0602; smoking initiation 0.1037; neurodegenerative disease 0.1584; abnormality of the skeletal system 0.2105; evidence_size = 3 for each listed disease | Open Targets Platform search result for ABCF2 (retrieved in this session), https://platform.opentargets.org/target/ENSG00000033050 | (pqac-00000000) |
| Evidence gap / annotation confidence | Despite strong family-level support for an ATPase/ribosome-related role, direct mechanistic evidence for human ABCF2 itself in canonical translation control remains limited in the retrieved literature. The best-supported ABCF2-specific functions currently concern anti-apoptotic activity and bacterial pathogenesis, so any annotation as a ribosome-associated translation factor should be presented as family-informed rather than conclusively ABCF2-specific. | Synthesis across sources | Human ABCF2 | Evidence gap is qualitative but important for functional annotation confidence | Fostier et al., 2021, https://doi.org/10.1002/1873-3468.13984; Ousalem et al., 2019, https://doi.org/10.1016/j.resmic.2019.09.005; Nougayrède et al., 2007, https://doi.org/10.1111/j.1462-5822.2006.00820.x | (pqac-00000003, pqac-00000004, pqac-00000011, pqac-00000014) |


*Table: This table summarizes the strongest family-level and ABCF2-specific evidence relevant to functional annotation of human ABCF2 (UniProt Q9UG63). It separates well-supported primary findings from family-based inferences and highlights where recent preprint and database evidence should be interpreted cautiously.*