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Association of TMV coat protein with chloroplast membranes in virus-infected leaves

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Summary

The polypeptide composition of extracts of chloroplasts from tobacco leaves systemically infected with different strains of Tobacco Mosaic Virus (TMV) was analyzed by one- and two-dimensional gel electrophoresis. There were no changes in the protein profiles of chloroplasts from infected leaves when compared to control leaves except for the presence of coat protein (CP) of TMV, identified by immunoblotting. When protease-treated intact chloroplasts isolated on Percoll gradients were osmotically disrupted the CP could be detected in both stroma and membrane fractions. The majority of the CP associated with the thylakoid membranes (about 1–5% of the total thylakoid proteins) was in the form of free molecules while stroma contained aggregated or assembled CP (about 0.1% of the soluble proteins). Thylakoid-associated CP was insensitive to protease digestion unless the membranes were first treated with a detergent, indicating that the CP was embedded inside or otherwise complexed with the thylakoid membranes.

Chloroplasts isolated from leaves infected with TMV-PV42, a symptomless strain, contained approximately 10–50 times less CP than did chloroplasts isolated from leaves bearing mosaic symptoms induced by other strains of TMV (U1, PV230 or PV39). A possible role of CP in symptom development is discussed.

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Authors and Affiliations

  1. Plant Biology Program, Department of Biology, Washington University, 63130, St. Louis, MO, U.S.A.

    Antonio Reinero & Roger N. Beachy

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  1. Antonio Reinero
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  2. Roger N. Beachy
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Reinero, A., Beachy, R.N. Association of TMV coat protein with chloroplast membranes in virus-infected leaves. Plant Mol Biol 6, 291–301 (1986). https://doi.org/10.1007/BF00034936

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  • DOI: https://doi.org/10.1007/BF00034936

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