Self-splicing occurs for rare introns that form a ribozyme, performing the functions of the spliceosome by RNA alone. There are two kinds of self-splicing introns, Group I and Group II.
Self-splicing RNA Refers to introns that have the ability to remove themselves from the precursor RNA and assist in the splicing of exons to form mature RNA.
Self-splicing intron that does not require an external nucleotide for splicing; releases the intron in a lariat form.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Satellite RNA (viroids). A small, self-splicing RNA molecule that accompanies several plant viruses, including tobacco ringspot virus.
S&E. See U.S. Department of Agriculture.
Xu, et. al., Bacterial Origin of a Chloroplast Intron: Conserved Self-Splicing Group I Introns in Cyanobacteria, Science 250: 1566 - 1569
Kuhsel, et. al., An Ancient Group I Intron Shared by Eubacteria and Chloroplasts, Science 250: 1570 - 1572 ...
Problem 4: Self-catalytic RNAs
RNAs that catalyze biological reactions, such as self-splicing introns, are known as:
A.
enzymes ...
Most virusoids and at least one viroid are self-splicing; that is they can cut themselves out of the precursor and ligate their ends without the aid of any host enzymes.
Thus they represent another class of ribozyme.
structures composed of small nuclear ribonuclear proteins (snRNPs (pronounced "snurps")), splice the 3' end of the first exon, form the intron into a lariat, splice the 5' end of the next exon, and fuse the exon-exon junction;
Self-splicing: ...
A small, self-splicing RNA molecule that accompanies several plant viruses, including tobacco ringspot virus. S&E. See U.S. Department of Agriculture. Self-pollination.
 See also: Splicing, Intron, Exons, Human, Nucleotide
  
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