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Gene Review

psbB  -  photosystem II CP47 protein

Nostoc sp. PCC 7120

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Disease relevance of psbB

  • Expression of the psbB gene in Anabaena 7120 results in two transcripts that begin 302 or 238 bp upstream of the open reading frame and both end 288 bp downstream following a 21 bp inverted repeat [1].
  • The Nostoc petBD genes are not closely linked to the psbB gene (encoding the 51-kDa photosystem II polypeptide) and do not contain introns as do the closely related chloroplast genes [2].

High impact information on psbB

  • The promoter of the nifHDK operon was active only in heterocysts; the promoter of the nifJ gene was active only in iron-depleted medium; and the promoters of the psbB gene, the ntcA gene, and a newly found transcription factor gene were all active in both cell types [3].
  • The utility of the vector was shown by deletion analysis of the promoter region of the Anabaena psbB gene [4].
  • We also show that the levels of these psbB gene transcripts as well as those of the glnA, rbcLS, and psbA genes, in RNA prepared from whole filaments, remain constant during heterocyst differentiation [1].
  • The psbB gene from the cyanobacterium Anabaena 7120 was cloned and its nucleotide sequence determined [1].


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