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Plant Physiology 60:89-94 (1977)
© 1977 American Society of Plant Biologists

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Articles

Evolutionary Conservation of Chloroplast Genes Coding for the Large Subunits of Fraction 1 Protein

Shain-Dow Kung1 and Ching-Ing Lee1

Denise D. Wood2 and Mario A. Moscarello2

1 Department of Biological Sciences, University of Maryland Baltimore County, Catonsville, Maryland 21228, Department of Biochemistry, Research Institute, The Hospital for Sick Children, Toronto, Canada

Crystalline fraction 1 protein, obtained from four species of Nicotiana, have identical polypeptide compositions and isoelectric points. However, the tryptic peptide map of the large subunit of this protein from N. knightiana and N. paniculata differs from that of N. tomentosa and N. tomentosiformis. Since the large subunits of fraction 1 protein are coded by chloroplast DNA, the difference in their primary structure reflects the structural changes of the chloroplast genes containing the coding information. This indicates that the rate of mutation of chloroplast DNA seems to be higher than predicated from the analysis of isoelectric points of this protein.






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Copyright © 1977 by the American Society of Plant Biologists