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Eukaryotic Gene Regulation
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User has deleted their subject information Mind Map on Eukaryotic Gene Regulation, created by Deleted user on 21/12/2016.
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Resource summary
Eukaryotic Gene Regulation
Eukaryotic regulation harder than in Prokaryotes
Hard for RNA polymerase to bind to eukaryotes
chromatin hides transcriptional regulatory regions
DNA packed into tight chromatin fibers of nucleosomes
nucleosome: DNA wrapped around octameric histone core
ionic bonds between histone (+) and DNA (-)
Histones need to be moved
Remodeling
Why
Expose regulatory regions to bind promoter
methods
swi/snf
uses ATP to "nudge" over histone cores
acetylation of histone tails
removes +ve charge on histone tails
Less attraction between histones and DNA
enzyme: HATs
nucleosome remoding
Require combinatorial system with many regulatory proteins bound to many regulatory DNA sequences and to each other for RNA polymerase to bind
enhanceosomes
Protein sequence that binds to enhancer and regulates gene expression
role in transcriptional regulation
recruit GTFs. activator proteins, CBP, and RNA polymerase
Promoter
Promoter-proximal elements
Enhancer
regulatory sequence to help create combinatorial system and enhance gene expression
-20000
-100 CCAAT
-200 GC-rich box
-30 TATA
Regulatory Proteins
General Transcription Factors (GTF)
DNA-binding region
regulatory protein binding region
DNA binding proteins
bends DNA for more stable enhancesome
GAL system
yeast
Chrom 12
UAS ->
GAL2
Gal2
1) brings galactose into cell
Chrom 2
GAL 7 <-
<- Upstream activation sequence (UAS)
GAL 10 <-
<- UAS ->
Mig1 site
-> GAL1
gal1
2) Converts galactose into galactose-1-phosphate
Mig1
Tup1
gal10
4) converts UDP-galactose into UDP-glucose
gal7
3) Converts galactose-1-phosphate into UDP-galactose
5) converts UDP-glucose into glucose-1-phosphate
enters Glycolysis
Gal4
DNA-binding domain: Attaches to UAS
GTF, dimer
Activation domain: Binds to other proteins
Mutation in either domain: cannot form enhanceosome
Gal80
binds to Gal4
prevent formation of enhanceosome
Gal3
Galactose and ATP present
Binds to Gal80
Removes Gal80 so enhanceosome can form
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