Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0006354 DNA-templated transcription elongation	IBA GO_REF:0000033	ACCEPT	Summary: Transcription elongation is an appropriate process for the plastid RNA polymerase beta subunit. Reason: rpoB is part of the PEP catalytic core that synthesizes RNA from DNA templates. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
GO:0003899 DNA-directed RNA polymerase activity	IBA GO_REF:0000033	ACCEPT	Summary: rpoB contributes to DNA-directed RNA polymerase activity as a subunit of plastid-encoded RNA polymerase. Reason: The catalytic activity belongs to the polymerase complex, so contributes_to is the correct relationship for this subunit. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
GO:0003677 DNA binding	IEA GO_REF:0000120	KEEP AS NON CORE	Summary: DNA binding is plausible for an RNA polymerase subunit but is less informative than polymerase contribution. Reason: Retain as a non-core feature while treating RNA polymerase contribution as the central role. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
GO:0003899 DNA-directed RNA polymerase activity	IEA GO_REF:0000120	ACCEPT	Summary: rpoB contributes to DNA-directed RNA polymerase activity as a subunit of plastid-encoded RNA polymerase. Reason: The catalytic activity belongs to the polymerase complex, so contributes_to is the correct relationship for this subunit. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
GO:0006351 DNA-templated transcription	IEA GO_REF:0000120	ACCEPT	Summary: DNA-templated transcription is the direct biological process for plastid RNA polymerase rpoB. Reason: The reviewed entry describes DNA-dependent RNA polymerase activity producing RNA from a DNA template. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
GO:0009507 chloroplast	IEA GO_REF:0000120	ACCEPT	Summary: Chloroplast localization is correct for this plastid-encoded RNA polymerase subunit. Reason: The reviewed entry places rpoB in the chloroplast. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt SUBCELLULAR LOCATION: Plastid, chloroplast.
GO:0032549 ribonucleoside binding	IEA GO_REF:0000002	KEEP AS NON CORE	Summary: Ribonucleoside binding is a broad substrate-binding inference for an RNA polymerase subunit. Reason: Keep as non-core; the more informative molecular role is contribution to DNA-directed RNA polymerase activity. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
GO:0034062 5'-3' RNA polymerase activity	IEA GO_REF:0000116	MARK AS OVER ANNOTATED	Summary: 5'-3' RNA polymerase activity reflects the RNA polymerase reaction but overstates the isolated subunit as the whole enzyme. Reason: The catalytic reaction belongs to the plastid RNA polymerase complex, with rpoB contributing as one core subunit. Supporting Evidence: file:POPTR/rpoB/rpoB-uniprot.txt DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.

Core Functions

Contributes the beta subunit to plastid DNA-directed RNA polymerase for chloroplast transcription and elongation.

Directly Involved In:

DNA-templated transcription DNA-templated transcription elongation

Cellular Locations:

chloroplast

Supporting Evidence:

file:POPTR/rpoB/rpoB-uniprot.txt
DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
file:POPTR/rpoB/rpoB-uniprot.txt
SUBCELLULAR LOCATION: Plastid, chloroplast.

References

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Suggested Experiments

Experiment: Perturb rpoB expression or editing and quantify chloroplast transcription elongation with RNA-seq or run-on assays.

Type: targeted functional assay

📚 Additional Documentation

Notes

(rpoB-notes.md)

rpoB notes

Reviewed GOA against rpoB-uniprot.txt and rpoB-goa.tsv.
Core interpretation: Plastid-encoded RNA polymerase beta subunit that contributes to chloroplast DNA-templated transcription and elongation.
Main evidence source: [file:POPTR/rpoB/rpoB-uniprot.txt].

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