CG8915 is an R3H-containing DEAH-family RNA helicase with conserved ATP-binding and catalytic motifs. It is inferred to couple ATP hydrolysis to RNA remodeling with 3'-to-5' polarity, based on its relationship to characterized YTHDC2-family enzymes. Its physiological RNA targets and cellular compartment remain unresolved. The protein is distinct from the divergent helicase-like Bgcn protein and lacks an annotated YTH methyladenosine-reader domain.
Summary: The conserved P-loop supports ATP binding as the specific nucleotide interaction.
Reason: The conserved P-loop supports ATP binding as the specific nucleotide interaction. Both sequence alignments preserve the diagnostic ATP-binding region, unlike the divergent Bgcn control.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
Summary: Nucleic acid binding is supported but less informative than RNA binding for this R3H-containing RNA helicase.
Reason: Nucleic acid binding is supported but less informative than RNA binding for this R3H-containing RNA helicase. The conserved domain architecture supports RNA as the relevant nucleic acid; no DNA-specific function is established.
Summary: CG8915 contains the RNA-helicase core and an R3H RNA-binding domain.
Reason: CG8915 contains the RNA-helicase core and an R3H RNA-binding domain. These features support the PAINT RNA-binding inference, independently of precise transcript specificity or of whether every mechanistic feature of mammalian YTHDC2 is retained.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
Summary: The broad activity is consistent with a conserved ATP-dependent RNA helicase.
Reason: The broad activity is consistent with a conserved ATP-dependent RNA helicase. The manually curated transfer from human YTHDC2 supplies the more informative 3'-5' RNA helicase activity, supported by target motif conservation and primary ortholog enzymology.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
Summary: CG8915 retains the diagnostic ATP-binding P-loop and catalytic DEAH motif.
Reason: CG8915 retains the diagnostic ATP-binding P-loop and catalytic DEAH motif. Comparative alignment to experimentally characterized YTHDC2 supports ATP utilization; the altered motifs of the separate Bgcn protein are not present in this target.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
Summary: The broad activity is consistent with a conserved ATP-dependent RNA helicase.
Reason: The broad activity is consistent with a conserved ATP-dependent RNA helicase. The manually curated transfer from human YTHDC2 supplies the more informative 3'-5' RNA helicase activity, supported by target motif conservation and primary ortholog enzymology.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
Summary: The manually curated ISS transfer from human YTHDC2 is biologically reasonable for this DEAH/R3H helicase with conserved ATP-binding and catalytic motifs.
Reason: The manually curated ISS transfer from human YTHDC2 is biologically reasonable for this DEAH/R3H helicase with conserved ATP-binding and catalytic motifs. Current FlyBase orthology also favors YTHDC2. This is conserved-function inference, not a fly biochemical assay; detailed RNA substrates, YTH-domain methyladenosine recognition and meiotic phenotypes are not implied.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions.
These computational predictions are reviewed separately from the GOA annotation set used for this review. The assessments below are from this project and do not constitute official GO annotations or endorsement by GO/UniProt. They are not included in the existing annotation review above.
LSP — Less precise than existing annotation Review score: 2/2
Prediction method: ProtNLM2 · Version: UniProt API snapshot 2026-09-08
Review rationale: Nucleic acid binding is supported by the R3H domain and conserved RNA-helicase architecture. RNA binding is the existing, more specific assignment. Target sequence analysis retains the ATP-binding and DEAH motifs, although the broad RNA-binding conclusion does not depend on resolving every aspect of catalysis or YTHDC2-family phylogeny.
Supporting Evidence:
file:DROME/CG8915/CG8915-bioinformatics/RESULTS.md: "CG8915/Q9VX63 retains a canonical ATP-binding P-loop and DEAH catalytic motif. It differs from the inactive helicase-like protein Bgcn/Q9W1I2 at both diagnostic regions."