title: Maize mitochondrial plasmid S-1 sequences share homology with chloroplast gene psbA.
abstract: The linear, 6397-base pair (bp), mitochondrial S-1 DNA molecule from maize contains a 420-bp segment that is homologous with the chloroplast gene (psbA) that codes for the quinone binding protein of photosystem II. This is the first report of a chloroplast sequence in a naturally occurring viral-like or plasmid DNA. The complete sequence of the S-1 chloroplast segment has been compared with homologous regions of six different chloroplast genes. The S-1 segment has diverged from the other genes both by length mutation and base substitution. Several of the length mutations are exact adjacent tandem duplications of 4 and 5 bp similar to "footprints" left after excision of transposable elements in maize nuclear DNA.
mesh_terms: D001483:Base Sequence; D002734:Chlorophyll / Q000235:genetics*; D002736:Chloroplasts / Q000378:metabolism*; D004262:DNA Restriction Enzymes; D005796:Genes; D045342:Light-Harvesting Protein Complexes; D008928:Mitochondria / Q000378:metabolism*; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D010940:Plant Proteins / Q000235:genetics*; D010944:Plants / Q000235:genetics*; D010957:Plasmids; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity; D003313:Zea mays / Q000235:genetics
chemical_list: D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D002734:Chlorophyll; D004262:DNA Restriction Enzymes