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. 1994 Apr;176(8):2374–2378. doi: 10.1128/jb.176.8.2374-2378.1994

A gene (ccmA) required for carboxysome formation in the cyanobacterium Synechocystis sp. strain PCC6803.

T Ogawa 1, E Marco 1, M I Orus 1
PMCID: PMC205361  PMID: 8157606

Abstract

A high-CO2-requiring mutant, G7, of Synechocystis sp. strain PCC6803 capable of inorganic carbon transport but unable to utilize the intracellular inorganic carbon pool for photosynthesis was isolated. Transmission electron micrographs of the mutant indicated that the mutant does not have any carboxysomes. A clone (pHPG7) with a 7.5-kbp DNA insert that transforms the G7 mutant to the wild-type phenotype was isolated from a genomic library of wild-type Synechocystis sp. strain PCC6803. Complementation tests with subclones identified the mutation site in G7 within 208 bp. Sequencing of nucleotides in this region elucidated an open reading frame, designated ccmA, encoding a protein of 302 amino acids. Cloning and sequence analysis of the respective G7 gene revealed an A-to-G substitution that results in an Asp-to-Gly substitution in the deduced amino acid. The result indicated that the ccmA gene encodes a protein essential for the formation of carboxysomes. An open reading frame encoding a proline-rich protein of 271 amino acids was found downstream of the ccmA gene, but no ccm-like genes or rbc operon was found in this region.

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Selected References

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