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Large unidentified open reading frame in plastid DNA (ORF2280) is expressed in chloroplasts

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Abstract

The chloroplast DNA encodes genes for components of photosynthesis and the transcription-translation machinery; a number of unidentified open reading frames (ORFs) are also present. To determine whether a large ORF in the inverted repeat of chloroplast DNA of tobacco (ORF2280) encodes a chloroplast protein, a conserved region of the ORF was expressed in Escherichia coli. An antibody against the ORF protein was prepared using the purified fusion protein as an antigen. When incubated with proteins from the soluble fraction of tobacco, spinach and Oenothera chloroplasts, the antiserum detects relatively labile polypeptides, which have apparent molecular weights of 170 to 180 kDa. The ORF in tobacco and spinach is large enough to encode a protein of 240–250 kDa, thus it is possible that post-transcriptional or post-translational processing reduces the size of the expression product. Analysis of Oenothera chloroplasts representing four different plastome types revealed endonuclease restriction fragment length polymorphisms in chloroplast DNA indicative of insertion/deletion events in a region of the chloroplast DNA that shared significant sequence similarity with ORF2280. The ORF2280 antiserum was used to demonstrate that there are qualitative differences in the ORF proteins from different Oenothera plastome types.

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  1. Department of Botany and Plant Pathology, Michigan State University, 48824, East Lansing, MI, USA

    Richard E. Glick & Barbara B. Sears

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  1. Richard E. Glick
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  2. Barbara B. Sears
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Glick, R.E., Sears, B.B. Large unidentified open reading frame in plastid DNA (ORF2280) is expressed in chloroplasts. Plant Mol Biol 21, 99–108 (1993). https://doi.org/10.1007/BF00039621

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  • DOI: https://doi.org/10.1007/BF00039621

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