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L9 - Protein Synthesis I
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First part of the two-part lecture on protein synthesis by Prof Robert Hindges
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L9 – Protein Synthesis I: DNA TranscriptionSlide 4 – DNA as genetic information
• 1944 – Avery: DNA as genetic material
• 1953 – Crick and Watson: DNA structure
• 1957 – Crick: The central dogma
Slide 5 – The central dogma of molecular biology
• “Once information has got into a protein it can’t get out again”
Slide 6-7 – Coding properties of nucleic acids
• Three key sets of experiments defined relationship between nuclear DNA and protein
expression
- A messenger exists that transmits information from the nucleus to the cytoplasm
(Brenner, 1960)
- The genetic code is read in triplets (Crick 1961, Nirenberg 1961, Khorana 1960s)
- The amino acid sequence is linearly related to the DNA sequence (Yanofsky, 1967)
Slide 8 – Transcription: from RNA to DNA
• When you make an RNA molecule, you read it from the template strand and make a
copy of it, which is then the same sequence with the upper (coding) strand
- Except for uracil in RNA and missing oxygen in DNA
, Slide 9 – RNA structure
Slide 10-11 – Transcription: RNA synthesis
• RNA polymerase enzymes make RNA
• Addition of nucleotides in 5’ to 3’ direction
• Requires a template, two strands of DNA need to be separated
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