Rhizobium Genetics and Plasmid Biology

  1. Symbiosis Plasmid Biology
    1. Sym Plasmid Characteristics
      1. Size and Copy Number
        1. Typical size ranges
          1. Low copy maintenance
            1. Replication control
            2. Essential Symbiotic Gene Content
              1. Nodulation gene clusters
                1. Nitrogen fixation genes
                  1. Regulatory elements
                  2. Host Range Determination
                    1. Specificity factors
                      1. Host adaptation mechanisms
                        1. Cross-inoculation patterns
                      2. Genetic Organization of Sym Plasmids
                        1. Modular Architecture
                          1. Functional gene clusters
                            1. Regulatory modules
                              1. Insertion sequences
                              2. Major Gene Regions
                                1. Nodulation (nod) gene clusters
                                  1. Nitrogen fixation (nif) genes
                                    1. Fixation (fix) genes
                                      1. Surface polysaccharide genes
                                        1. Type III secretion systems
                                          1. Type IV secretion systems
                                          2. Regulatory Networks
                                            1. Transcriptional regulators
                                              1. Two-component systems
                                                1. Small regulatory RNAs
                                              2. Sym Plasmid Replication and Maintenance
                                                1. Replication Origins
                                                  1. Origin structure
                                                    1. Initiator proteins
                                                      1. Replication timing
                                                      2. Partitioning Systems
                                                        1. Par proteins
                                                          1. Centromere-like sequences
                                                            1. Segregation mechanisms
                                                            2. Stability Mechanisms
                                                              1. Post-segregational killing
                                                                1. Multimer resolution
                                                                  1. Copy number control

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                                                              2. Rhizobial Genome Organization

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                                                              4. Molecular Communication and Nodulation