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The pet genes of Rhodospirillum rubrum: cloning and sequencing of the genes for the cytochrome bc 1-complex

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Summary

A cytochrome bc 1-complex of Rs. rubrum was isolated and the three subunits were purified to homogeneity. The N-terminal amino acid sequence of the purified subunits was determined by automatic Edman degradation. The pet genes of Rhodospirillum rubrum coding for the three subunits of the cytochrome bc 1-complex were isolated from a genomic library of Rs. rubrum using oligonucleotides specific for conserved regions of the subunits from other organisms and a heterologous probe derived from the genes for the complex of Rb. capsulatus. The complete nucleotide sequence of a 5500 by SalI/SphI fragment is described which includes the pet genes and three additional unidentified open reading frames. The N-terminal amino acid sequence of the isolated subunits was used for the identification of the three genes. The genes encoding the subunits are organized as follows: Rieske protein, cytochrome b, cytochrome c 1. Comparison of the N-terminal protein sequences with the protein sequences deduced from the nucleotide sequence showed that only cytochrome c 1 is processed during transport and assembly of the three subunits of the complex. Only the N-terminal methionine of the Rieske protein is cleaved off. The similarity of the deduced amino acid sequence of the three subunits to the corresponding subunits of other organisms is described and implications for structural features of the subunits are discussed.

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Abbreviations

BSA:

bovine serum albumin

SDS:

sodium dodecylsulphate

Rs:

Rhodospirillum

Rb:

Rhodobacter

Pc:

Paracoccus

Rps:

Rhodopseudomonas

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Communicated by J. Lengeler

The nucleotide sequence reported in this paper has been submitted to the GenBank™/EMBL Data Bank with accession number X55387

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Majewski, C., Trehst, A. The pet genes of Rhodospirillum rubrum: cloning and sequencing of the genes for the cytochrome bc 1-complex. Molec. Gen. Genet. 224, 373–382 (1990). https://doi.org/10.1007/BF00262431

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  • DOI: https://doi.org/10.1007/BF00262431

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