Trans - Gene Expression Flashcards
retroviruses
RNA viruses that make DNA copies of themselves by using reverse transcriptase
reverse transcriptase
enzyme that creates DNA from RNA template
retrotransposons
sequences of DNA that make RNA copies of themselve, then get reverse-transcribed into DNA
operons - type/level of control
transcriptional control
operons
functioning unit of genomic DNA containing a cluster of genes under the control of a single regulatory signal or promoter
enzyme for transcription
RNA polymerase
subunits of RNA polymerase [5]
[1] alpha1 [2] alpha2 [3] beta' [4] beta [5] omege
alpha1 subunit of RNA polymerase
assembling of RNA polymerase complex
alpha2 subunit of RNA polymerase
assembling of RNA polymerase complex
beta’ subunit of RNA polymerase
template binding
beta subunit of RNA polymerase
catalytic subunit for RNA synthesis
enzyme catalyzed by beta subunit of RNA polymerase
5’ –> 3’ polymerase
omega subunit of RNA polymerase
unclear function
subunits of eukaryotic RNA polymerase
2 alpha, 2 beta, omega, 7 more
RNA polymerase I
synthesis of rRNA (28S, 18S, 5.8S)
RNA polymerase II
synthesis of mRNA
RNA polymerase III
synthesis of tRNA, snRNA, 5S rRNA, misc RNAs
raw materials for new RNA
ATP, CTP, GTP, UTP
direction of transcription
5’–>3’
processes involved in transcription
initiation, elongation, termination
relationship of chromatin structure to gene expression
open chromatin –> increased gene expression
transcription unit
transcribed segment of DNA
promoter regions [3]
[1] TATA box
[2] CAAT box
[3] GC box
classes of transcription factors [3]
[1] basal components
[2] activators
[3] corregulators
basal components
allow transcription to take place at lower levels
examples of basal components
TBP, TFIIA, B, E, F, H
activators
bind to distal regulatory elements - enhancers
corregulators
bind to distal regulatory elements - enhancers
examples of activators
TFIID
examples of corregulators
SP1, atf, ctf, ap1
TFIID
recognizes TATA box, activator
TFIIH
helicase - unwinds DNA; kinase - phosphorylates polymerase
TFIIF
brings polymerase to promoter
Sp1
recognizes GC box