RNA World Flashcards
What is the structure of the group 1 intron ribozyme?
A rich bulge
Tetraloop
tetraloop receptor
What catalytic mechanism does the ribozyme have?
Either acid/base catalysis or 2 divalent metal ions
What catalytic mechanism does the spliceozyme have?
G nucleophilic attack onto the 3’ intron induced by free GTP
How does the spliceozyme detect sequence?
Complex coiled shape produces active site by self base pairing
Who first observed RNA self splicing?
Tom Cech by removing all protein from solution
How long is self splicing RNA?
100s of nucleotides
What did Sidney Altman study?
RNase P to determine catalytic component is RNA
Who studied the prebiotic soup?
Miller and Urey
What did the prebiotic soup experiment show?
Amino acids, nucleotides and oxyribose sugars could be synthesised in basic environment
What small molecules are contained in the prebiotic soup?
Water,
Hydrogen
Methane
Ammonia
How were the products of the prebiotic soup observed?
Aromatic chromophores
Why are polymerases needed?
Natural polymerisation occurs too slowly for sustain organisms with a defined lifespan
What does the Hammerhead ribozyme show?
The viriod contains no peptide sequences but can self replicate using 20nt within a 200nt cRNA linear product folded into 3D structure
Which virus has the Hammerhead ribozyme?
Cadang Candang virus
What can RNA be modified into?
Cofactors
deoxyribose sugars for DNA