Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 97, Issue 11, Pages 5784-5789Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.97.11.5784
Keywords
-
Categories
Ask authors/readers for more resources
In vitro selection was used to isolate Mg2+-dependent self-cleaving ribozymes from random sequence. Characterization of representative clones revealed the emergence of at least 12 classes of ribozymes that adopt distinct secondary structure motifs, Only one class corresponds to a previously known structural motif, that of the naturally occurring hammerhead ribozyme, Each ribozyme promotes self-cleavage via an internal phosphoester transfer reaction involving the adjacent 2'-hydroxyl group with a chemical rate enhancement of between 10(3)- and 10(6)-fold greater than the corresponding uncatalyzed rate. These findings indicate that RNA can form a multitude of secondary and tertiary structures that promote cleavage by internal phosphoester transfer. Upon further in vitro selection, a class I ribozyme that adopts an X motif structure dominates over all other ribozymes in the population. Thus, self-cleaving RNAs isolated by in vitro selection from random-sequence populations can rival the catalytic efficiency of natural ribozymes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available