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DNA Replication and Synthesis

DNA Replication and Synthesis. •Complementarity. •”It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism … “. •Mode of DNA Replication. •Conservative. •Semiconservative. •Dispersive. *Overview: DNA replication.

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DNA Replication and Synthesis

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  1. DNA Replication and Synthesis •Complementarity •”It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism … “ •Mode of DNA Replication •Conservative •Semiconservative •Dispersive

  2. *Overview: DNA replication

  3. *Overview: DNA replication

  4. Origin and Direction Replication fork Replicon

  5. DNA Polymerases •chain elongation in a 5’-to-3’ direction •biological activity?

  6. DNA Polymerase

  7. Exonuclease Activities of DNA Polymerases

  8. Initiation *Strands must separate •DnaA •Helicases (DnaB and DnaC) •SSBPs (DnaA) •Topoisomerase (DNA gyrase)

  9. Initiation *Primase *Two strands of a double helix are antiparallel •Continuous DNA synthesis = leading •Discontinuous DNA synthesis = lagging

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