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Construction of insertion mutants of Synechocystis sp. PCC 6803: evidence for an essential function of subunit IV of the cytochrome b6/f complex

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Abstract

The gene encoding subunit IV of the cytochrome b6/f complex (petD) has been isolated from a genomic library of the unicellular cyanobacterium Synechocystis sp. PCC 6803. The coding region consists of 480 nucleotides and can code for a polypeptide with a molecular weight of 17.5 kDa. The deduced amino acid sequence shows high identity with the corresponding sequences of both the photoautotrophic prokaryote Nostos sp. PCC 7906 as well as of lower and higher photoautotrophic eukaryotes (e.g. Chlorella protothecoides, Nicotiana tabacum). Transformation of Synechocystis sp. PCC 6803 with a plasmid containing the cloned petD gene in which the coding sequence is interrupted by the aminoglycoside 3′-phosphotransferase gene (aph) from Tn903 resulted in the formation of km resistant transformants. The molecular analysis of independent transformants revealed that all clones were merodiploid containing both uninterrupted wild-type as well as interrupted mutant petD copies. Approaches to segregate these two genomes were unsuccessful implying an essential function of the petD gene product in Synechocystis sp. PCC 6803.

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Abbreviations

aph :

aminoglycoside 3′-phosphotransferase

cpDNA :

chloroplast DNA

km :

kanamycin

PSI :

photosystem I

PSII :

photosystem II

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Osiewacz, H.D. Construction of insertion mutants of Synechocystis sp. PCC 6803: evidence for an essential function of subunit IV of the cytochrome b6/f complex. Arch. Microbiol. 157, 336–342 (1992). https://doi.org/10.1007/BF00248678

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  • DOI: https://doi.org/10.1007/BF00248678

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