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    Cell. 1986 Oct 10;47(1):73-80.

    Evidence in favor of the symbiotic origin of chloroplasts: primary structure and evolution of tobacco glyceraldehyde-3-phosphate dehydrogenases.

    Shih MC, Lazar G, Goodman HM.

    We report nucleotide sequences of cDNAs for the nuclear genes encoding chloroplast (GapA and GapB) and cytosolic (GapC) glyceraldehyde-3-phosphate dehydrogenases (GAPDH) from N. tabacum. Comparison of nucleotide sequences indicates that the GapA and GapB genes evolved following duplication of an ancestral gene about 450 million years ago. However, the divergence of GapA/B and GapC occurred much earlier in evolution than the divergence of GapC and GAPDH genes of animals and fungi, suggesting that chloroplast and cytosolic GAPDHs evolved from different lineages. Comparison of amino acid sequences shows that the chloroplast GAPDHs are related to GAPDHs found in thermophilic bacteria, while the cytosolic GAPDH is related to the GAPDH found in mesophilic prokaryotes. These results strongly support the symbiotic origin of chloroplasts.

    PMID: 3757034 [PubMed - indexed for MEDLINE]

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