Year-end Sale % OFF 
Abstract
The ribosomal genes of Physarum polycephalum are located on linear DNA molecules (rDNA) of 38 x 10(6) daltons present in each nucleolus in 100--200 copies. The rDNA is not part of the large chromosomal DNA. These molecules have now been solubilized in the form of transcriptionally active deoxyribonucleoprotein complexes from nucleoli purified through Percoll gradients. The ribosomal chromatin (rDNP) sediments in sucrose gradients as a homogeneous fraction with an approximate sedimentation coefficient of 100 S. It contains alpha-amanitin-resistant RNA polymerase I activity and rDNA as its major (or sole) DNA component. Buoyant density analysis indicates that ribosomal chromatin contains, besides RNA polymerase I, significant amounts of additional protein. RNA synthesized in vitro by the endogenous RNA polymerase is complementary to rDNA and is transcribed mainly from the sequences coding for 19S and 26S ribosomal RNA.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
