central_dogma
1970 Crick
Reverse transcriptase: making DNA from RNA
promoter
Remove RNAP II.
RNA_processing
The 5' cap, 3' poly-A tail, and
UnTranslated Regions facilitate
ribosome attachment.
triplets
How many possible combos of triplets? 4
3=64.
genetic_code
Asn=Asparagine, Asp=Aspartic Acid, Glu=Glutamic Acid, Gln=Glutamine
mutation
GAA -> GUA: bottom row, 3 and 1
A mutation story: why can dogs synthesize vitamin C, but not higher primates?
mutation_nonsense
AAG 3rd row, 3
mutation_missense
AGC: 3rd row, 4
mutation_silent
GGC -> GGU bottom. 4
===
ACT17&B/3:
part 5 exercise: use
red
ribose;
ACT17&D/6:
translation: 45 kinds tRNA; use ATP to attach a.a. to tRNA, GTP on
ribosome?
1=C 2=B C=D 4=E 5=B
- RNA polymerase II.
After the end of the 3' coding region of an mRNA has been transcribed:
(a) The polyadenylation sequence is bound by a cleavage and
polyadenylation specificity factor (CPSF).
(b) An endonuclease binds to CPSF and cleaves the transcript.
(c) A polymerase binds to CPSF, adding up to 250 adenylate residues to the 3' end of the transcript.
- Transcription termination pacman:
polyA factors vacate the C-terminal domain (CTD) of the RNA polymerase (II), making room for Rtt103, Rai1, and Rat1.
The nuclease Rat1 then begins to digest the growing mRNA. Though the polymerase continues synthesis, Rat1 gives chase,
and once it catches up to the polymerase catalytic domain, the entire complex detaches from DNA.
- 5'cap & poly-A tail: protect from hydrolytic enzymes, attach ribosomes.
- UTR: UnTranalated Regions - bind ribosomes.
- Introns allow for alternative RNA splicing, exon shuffling: crossing over between exons.
- Some introns
are ribozymes.
- Luciferase
used as a "reporter gene".
- BT: Bacillus thuringiensis: protein (Bt delta endotoxin) kills Lepidoptera larvae, European corn borer.