Isolation and Characterization of Chloroplast DNA from the Marine Chromophyte, Olisthodiscus luteus: Electron Microscopic Visualization of Isomeric Molecular Forms 1

AUTOR(ES)

Aldrich, Jane

RESUMO

Chloroplast DNA (ctDNA) from the marine chromophytic alga, Olisthodiscus luteus, has been isolated using a whole cell lysis method followed by CsCl-Hoechst 33258 dye gradient centrifugation. This DNA, which has a buoyant density of 1.691 grams per cubic centimeter was identified as plastidic in origin by enrichment experiments. Inclusion of the nuclease inhibitor aurintricarboxylic acid in all lysis buffers was mandatory for isolation of high molecular weight DNA. Long linear molecules (40 to 48 micrometers) with considerable internal organization comprised the majority of the ctDNA isolated, whereas supertwisted ctDNA and open circular molecules averaging 46 micrometers were occasionally present. Also observed in this study were folded ctDNA molecules with electron dense centers (“rosettes”) and plastid DNA molecules which have a tightly wound “key-ring” center. The ctDNA of Olisthodiscus has a contour length that is median to the size range reported for chlorophytic plants.

Documentos Relacionados

• Kinetic Complexity, Homogeneity, and Copy Number of Chloroplast DNA from the Marine Alga Olisthodiscus luteus1
• Sequence and secondary structure of chloroplast 16S rRNA from the chromophyte alga Olisthodiscus luteus, as inferred from the gene sequence.
• Gene for the ribulose-1,5-bisphosphate carboxylase small subunit protein of the marine chromophyte Olisthodiscus luteus is similar to that of a chemoautotrophic bacterium.
• Equilibrium melting of plasmid ColE1 DNA: electron-microscopic visualization.
• Structural, Functional, and Evolutionary Analysis of Ribulose-1,5-Bisphosphate Carboxylase from the Chromophytic Alga Olisthodiscus luteus1