DNA Replication Transcription and Translation Every great advance
- Slides: 81
DNA Replication, Transcription and Translation
“Every great advance in science has issued from a new audacity of the imagination” - John Dewey
Eucaryotic DNA and RNA 3 -5% of genomic DNA is coding or informational Only a portion of DNA is transcribed into RNA makes up about 1/2 of the nucleic acid/cell r. RNA is the most abundant ≈ 90% With protein it assembles into ribosomes, site of translation m. RNA is about 2 -3% of the RNA Has poly A attached at the 3’ end Has a 5’ methyl cap May require processing and splicing t. RNA carries amino acids to ribosomes
DNA replication Four nucleotide bases Nucleotide triphosphates Phosphodiester bonds 5’ to 3’ DNA structure Hydrogen bonds, complementary base pairing A pairs with T G pairs with C Double stranded structure
DNA Four nucleotide bases
Nucleotide
DNA Replication
Nucleotide Polymerization Template Primer DNA polymerase 5’ to 3’ polymerization
Leading & Lagging Strand Replication Leading Strand • Continuous replication Lagging Strand • Discontinuous replication Okazaki fragments RNA primers
Procaryotic Replication RNA primers Dimer of Polymerase III polymerizes DNA polymerase I repairs Okazaki fragments Primosome • DNA helicase • DNA primase SSB proteins
Eucaryotic DNA Replication Dimer of DNA polymerase d polymerizes Primosome • DNA polymerase a/primase • Helicase RNA primers SSB proteins
Bidirectional Replication Polymerase III dimer Continuous replication Discontinuous replication
Telomere Replication
3 D Packing of Human DNA
Central Dogma---DNA RNA Protein
Transcription
RNAs r. RNA-class I gene in eucaryotes m. RNA-class II genes in eucaryotes t. RNAs-class III genes in eucaryotes Other RNAs • sno. RNAs • cytoplasmic stable RNAs
Basic Transcription Initiation Elongation Termination
Procaryotic Transcription A single RNA polymerase • Sigma factors give specificity Sensitive to Riframpicin antibiotic Coupling of transcription & translation Polycistronic m. RNAs No introns Pribnow box involved in initiation
Eucaryotic Transcription Three RNA polymerases • RNA pol I-r. RNA • RNA pol II-m. RNA • RNA pol III-t. RNA Pol II & III sensitive to mushroom toxin a-amanitin Transcription & Translation separated • Spacial • Temporal Exons & Introns TATAA box involved in initiation
Life Cycle of an m. RNA Transcription Modification • Methylation • Poly A addition Processing Export Translation Turnover
RNA Splicing sn. RNPs 5’, 3’splice sites Branchpoint Spliceosome Transesterification #1 Transesterification #2 Lariat formation Spliced exons Turnover
RNA Splicing Dynamics
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- Dna vs rna
- Messenger rna sequence
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- Rho independent termination
- Dna to rna transcription
- Translation
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- Translation transcription
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- 5 enzymes responsible for dna replication
- Polyribosomes
- Major enzymes in dna replication
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- Primase
- Significance of replication
- What role does dna polymerase play in copying dna?
- Nucleotide in dna replication
- Dna replication fork
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- Dna replication steps
- Tata box
- Replication fork
- Orc dna replication
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- The replication bubble and antiparallel elongation
- Summary of dna replication
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- Dna replication is considered semiconservative because