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Isolation and characterization of the ccmM gene required by the cyanobacterium Synechocystis PCC6803 for inorganic carbon utilization

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Abstract

A high CO2-requiring mutant of Synechocystis PCC6803 (G3) capable of Ci transport but unable to utilize the intracellular Ci pool for photosynthesis was constructed. A DNA clone of 6.1 kbp that transforms the G3 mutant to the wild-type phenotype was isolated from a Synechocystis PCC6803 genomic library. Complementation test with subclones allocated the mutation site within a DNA fragment of 674 bp nucleotides. Sequencing analysis of the mutation region elucidated an open reading frame encoding a 534 amino-acid protein with a significant sequence homology to the protein coded by the ccmN gene of Synechococcus PCC7942. The ccmM-like gene product of Synechocystis PCC6803 contains four internal repeats with a week similarity to the rbcS gene product. An open reading frame homologous to the ccmN gene of Synechococcus PCC7942 was found downstream to the ccmM-like gene. As opposed to the Synechococcus PCC7942 ccmM and ccmN genes located 2 kbp upstream to, and oriented in the same direction as, the rbc operon, the ccm-like genes in Synechocystis PCC6803 are not located within 22 kbp upstream to the rbcL gene of the Rubisco operon. Thus, despite the resemblance in clustering of the ccmM and ccmN genes in both cyanobacterial species, the difference in their genomic location relative to the rbc genes demonstrates variability in structural organization of the genes involved in inorganic carbon acquisition.

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Abbreviations

CCM:

CO2-concentrating mechanism

Ci :

inorganic carbon

HCR:

high CO2-requiring

kbp:

kilobase pair

ORF:

open reading frame

Rubisco:

ribulose 1,5-bisphosphate carboxylase-oxygenase gene

SSC:

sodium chloride and sodium citrate

WT:

wild-type

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Ogawa, T., Amichay, D. & Gurevitz, M. Isolation and characterization of the ccmM gene required by the cyanobacterium Synechocystis PCC6803 for inorganic carbon utilization. Photosynth Res 39, 183–190 (1994). https://doi.org/10.1007/BF00029385

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  • DOI: https://doi.org/10.1007/BF00029385

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