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Characterization of the TrnD, TrnK, PsaA locus of Euglena gracilis chloroplast DNA

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Abstract

The EcoRI fragment Eco J' of Euglena gracilis chloroplast DNA has previously been identified as a tRNA coding locus. The nucleotide sequence of a 2.3-kb region of the Eco J' fragment known to contain the tRNA genes has been determined. This locus was found to contain two tRNA genes, trnD-GTC and trnK-TTT. Separated from the trnK locus by a 43-bp spacer is an open reading frame of 398 codons. The open reading frame is 73–75% homologous to the amino-terminal coding regions of the spinach and maize genes for the P700 chlorophyll a apoprotein of photosystem I. It has been identified as exon I of an intron-containing psaA gene. The exon is followed by an intron of at least 214 bp that has features characteristic of other Euglena chloroplast introns. Major chloroplast RNA transcripts of sizes 5.5, 4.7, and 2.3 kb hybridize to a psaA-specific probe. The gene for a second photosystem I P700 apoprotein, psaB, has been located on an adjacent EcoRI fragment, Eco C.

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Authors and Affiliations

  1. Department of Botany, University of California, 94720, Berkeley, CA, USA

    Thianda Manzara

  2. Waksman Institute of Microbiology, Rutgers University, 08854, Piscataway, NJ, USA

    Jian-Xian Hu & Carl A. Price

  3. Department of Biochemistry, University of Arizona, 85721, Tucson, AZ, USA

    Richard B. Hallick

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  1. Thianda Manzara
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  2. Jian-Xian Hu
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  3. Carl A. Price
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  4. Richard B. Hallick
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Manzara, T., Hu, JX., Price, C.A. et al. Characterization of the TrnD, TrnK, PsaA locus of Euglena gracilis chloroplast DNA. Plant Mol Biol 8, 327–336 (1987). https://doi.org/10.1007/BF00021312

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  • DOI: https://doi.org/10.1007/BF00021312

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