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Gene Review

psbH  -  photosystem II reaction center protein H

Arabidopsis thaliana

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High impact information on psbH

  • Additionally, mutant hcf152-1 is affected in the accumulation of transcripts cleaved between the genes psbH and petB [1].
  • The nucleus-encoded HCF107 gene of Arabidopsis provides a link between intercistronic RNA processing and the accumulation of translation-competent psbH transcripts in chloroplasts [2].
  • In vivo protein labeling, in vitro phosphorylation, and immunoblot experiments revealed that the psbB gene product (CP47) and an 8-kD phosphoprotein, the psbH gene product (PsbH), are absent in mutant plants [2].
  • These data and additional experiments with the cytochrome b(6)f complex mutant hcf152, which is defective in 3' psbH processing, suggest that only those psbH-containing transcripts that are processed at their -45 5' ends can be translated [2].
  • We propose that this unfolding of the psbH leader segment as a result of RNA processing is essential for the translation of the psbH reading frame [2].

Biological context of psbH

  • The rbcL transcript was present at very low levels, the pattern of transcripts from the polycistronic psbB-psbH-petB-petD operon was abnormal, and the mature psbH message was almost completely lacking [3].

Associations of psbH with chemical compounds

  • A single mutation in the third RTPR that changes a conserved alanine residue to a threonine affects both 5'-end-processed psbH transcript accumulation as well as psbB translation, resulting in disruption of PSII and seedling lethal plants [4].


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