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. 1985 May;4(5):1125–1128. doi: 10.1002/j.1460-2075.1985.tb03749.x

Nucleotide sequence of the S-1 mitochondrial DNA from the S cytoplasm of maize

Michèle Paillard 1, Ronald R Sederoff 1, Charles S Levings III 1
PMCID: PMC554313  PMID: 16453611

Abstract

Mitochondria from the S male-sterile cytoplasm of maize contain unique DNA-protein complexes, designated S-1 and S-2. These complexes consist of double-stranded linear DNAs with proteins covalently attached to the 5' termini. To learn more about these unusual DNAs we have determined the complete nucleotide sequence of the S-1 DNA molecule (6397 bp). The sequence of S-2 has been previously determined. S-1 and S-2 are structurally similar and contain ˜1.7kb of sequence homology. S-1 is terminated by exact 208-bp inverted repeats that are identical with the terminal inverted repeats of S-2. S-1 and S-2 also contain a 1462-bp region of nearly perfect homology, which includes one of the terminal inverted repeats. The homology between the two molecules may be maintained, in part, by homologous recombination. S-1 has three long unidentified open reading frames, URF2 (1017 bp), URF3 (2787 bp) and URF4 (768 bp). URF2 occurs in the 1462-bp region of homology and is identical in length and location in both S-1 and S-2. Based on their structural organization and their viral-like characteristics, we propose that S-1 and S-2 code for functions involved with their maintenance and replication.

Keywords: plasmid-like DNAs, terminal inverted repeats, cytoplasmic male sterility, nucleotide sequence

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Selected References

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