exam #1 is t 9/23 in class (bring cheat sheet)
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Exam #1 is T 9/23 in class (bring cheat sheet). DNA is used to produce RNA and/or proteins, but not all genes are expressed at the same time or in the same cells. How do cells control which genes are expressed?. Protein. Signal Transduction. External. Stimulus. Internal. Effector…. - PowerPoint PPT PresentationTRANSCRIPT
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•Exam #1 is T 9/23in class(bring cheat sheet)
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Protein
DNA is used to produce RNA and/or proteins, but not all genes are expressed at the same time or in the same cells.How do cells control which genes are expressed?
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Stimulus
Signal Transduction
Stimulus
Perception(by receptor)
EffectorResponse
(change in cellular components and/or gene expression)
Effector…Effector
Effector
External
Internal
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How do cells express genes?
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a gene
The relationship between DNA and genes
promoter coding region terminator non-geneDNA
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Combinations of 3 nucleotides code for each 1 amino acid in a protein.
Fig 13.2
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• Overview of transcription Fig 12.2
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Fig 9.8
Each nucleotide carbon is numbered
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Fig 9.22
Each nucleotide is connected from the 5’ carbon through the phosphate to the next 3’ carbon.
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Fig 9.22
Each nucleotide is connected from the 5’ carbon through the phosphate to the next 3’ carbon.
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The relationship between DNA and RNA
Fig 12.8
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Fig 12.8
What is so magic about adding nucleotides to the 3’ end?
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Fig 12.7
How does the RNA polymerase know which strand to transcribe?
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5’5’3’
3’5’
Reverse promoter, reverse direction and strand transcribed.
RNA
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DNARNA RNA
DNA
UU
Why do polymerases only add nucleotides to the 3’ end?
similar to Fig 11.11
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P
Error
P-P
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The 5’ tri-P’s can supply energy for repair
Error
P
P-P-PPU
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3’
5’Error repair on 5’ end not possible.
Incoming nucleotide
similar to Fig 11.11
U
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DNARNA RNA
DNA
UU
Need for error repair limits nucleotide additions to 3’ end.
similar to Fig 11.11
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a gene
When to express a gene is critical
promoter coding region terminator non-geneDNA
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Promoter sequences in E. coli Fig 12.5
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Transcription initiation in prokaryotes:sigma factor binds to the -35 and -10 regions and then the RNA polymerase subunits bind and begin transcription
Fig 12.7
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Transcription Elongation Fig 12.8
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Termination of Transcription Fig 12.11
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Eukaryotic promoters are more diverse and more complex
Fig 12.13
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Fig 12.14
in eukaryotes: transcription factors are needed before RNA polymerase can bind
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Transcription overviewFig 12.3
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Some genes code for RNA (tRNA, rRNA, etc) mRNA is used to code for proteins
Protein
RNA synthesis
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rRNA is transcribed by RNA polymerase I
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tRNA is transcribed by RNA polymerase III
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mRNA is transcribed by RNA polymerase II
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mRNA is processed during transcription and before it leaves the nucleus.
(transcribed from DNA)
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Addition of the 5’ cap, a modified guanineFig 12.23
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Addition of the 3’ poly-A tail Fig 12.24
After the RNA sequence AAUAAA enzymes cut the mRNA and add 150 to 200 A’s
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What do the cap and tail do?
(transcribed from DNA)
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Luciferase Gene (from fireflies) Expressed in a Plant
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4.7% 0.34% 0.22%100%
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The cap and tail have overlapping and distinct functions
Protects from degradation/ recognition for ribosome
Protects from degradation/ transport to cytoplasm
5’ untranslatedregion
3’ untranslatedregion
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DNA Composition:In humans:•Each cell contains ~6 billion base pairs of DNA.•This DNA is ~2 meters long and 2 nm wide.•~3% directly codes for amino acids•~10% is genes•In a single human cell only about 5-10% of genes are expressed at a time.
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Introns are spliced out of most mRNAs before they leave the nucleus.
(transcribed from DNA)
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• Conserved sequences related to intron splicing
Sequences shown in bold are highly conserved
Serve as recognition sites for the binding of the spliceosome
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Splicing an intron: intron removal.
Fig 12.22
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Splicing an intron: reattach exons.
Fig 12.22
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Alternate splicing of introns/exons can lead to different proteins produced from the same gene.
Fig 15.16
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Complex patterns of eukaryotic mRNA splicing
Fig 15.16
(-tropomyosin)
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Fruit fly DSCAM, a neuron guide,115 exons over 60,000 bp of DNA20 exons constitutively expressed95 exons alternatively splicedFor over 38,000 possible unique proteins
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Size and Number of Genes for Some Sequenced Eukaryotic Genomes
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RNA editing:Some mRNAs are changed after transcription by guide RNA
http://www.cc.ndsu.nodak.edu/instruct/mcclean/plsc731/genome/genome9.htm
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/R/RNA_Editing.html
Tbl 12.3
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A processed mRNA ready for translation
5’ untranslatedregion
3’ untranslatedregion
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•Exam #1 is T 9/23in class(bring cheat sheet)