psbN

Gene Description

Chloroplast thylakoid membrane PsbN protein, probably involved in photosystem biogenesis rather than a stable photosystem II core subunit.

Core Functions

Supports photosystem biogenesis at the thylakoid membrane, with evidence favoring a biogenesis role rather than membership in the PSII core complex.

Directly Involved In:

photosystem I assembly photosystem II assembly

Cellular Locations:

chloroplast thylakoid membrane

Supporting Evidence:

file:MISSI/psbN/psbN-uniprot.txt
May play a role in photosystem I and II biogenesis.
file:MISSI/psbN/psbN-uniprot.txt
SUBCELLULAR LOCATION: Cellular thylakoid membrane
file:MISSI/psbN/psbN-uniprot.txt
Originally thought to be a component of PSII; based on experiments in Synechocystis, N.tabacum and barley, and its absence from PSII in T.elongatus and T.vulcanus, this is probably not true.

References

file:MISSI/psbN/psbN-uniprot.txt

UniProtKB entry for Miscanthus sinensis psbN

UniProt describes PsbN as a thylakoid membrane protein that may play a role in photosystem I and II biogenesis and cautions that it is probably not a PSII component.

Suggested Experiments

Experiment: Analyze PSI and PSII assembly intermediates and mature complex abundance after psbN perturbation.

Type: targeted functional assay

📚 Additional Documentation

Notes

(psbN-notes.md)

Curation notes

The GOA file for psbN contains only the header row, so there are no existing GOA annotations to review.

UniProt cautions that PsbN was originally thought to be a PSII component but probably is not. The review therefore captures a photosystem biogenesis role and avoids placing PsbN in the PSII complex.