Is Group 1 ribozyme an intron?

Group I introns are large self-splicing ribozymes. They catalyze their own excision from mRNA, tRNA and rRNA precursors in a wide range of organisms. The core secondary structure consists of nine paired regions (P1-P9).

What are group I and group II introns?

Altogether, these elements are found in all three domains of life: group I introns are present in bacteria, bacteriophages and eukaryotes (organellar and nuclear genomes), while group II introns are present in bacteria, archaea and eukaryotic organelles.

Is a self-splicing intron a ribozyme?

Twin-ribozyme introns have a highly complex structural organization that consists of a standard self-splicing ribozyme responsible for SSU rRNA exon ligation, intron excision and the generation of full-length intron RNA circles.

What types of biochemical reactions does a group 1 intron ribozyme catalyze?

Group I intron RNAs are ribozymes that catalyze two consecutive trans-esterification reactions to excise themselves from the precursor RNAs and ligate the flanking exons together (1).

Where are group II introns found?

Distribution and phylogeny. Group II introns are found in rRNA, tRNA, and mRNA of organelles (chloroplasts and mitochondria) in fungi, plants, and protists, and also in mRNA in bacteria.

What types of biochemical reactions does a group 1 intron catalyze?

What is a difference between group I and group II introns quizlet?

-Group I introns form a lariat structure. -Group II introns use an exogenous guanosine as a cofactor. -Group I introns use an exogenous guanosine as a cofactor.

Where are introns found?

genes
Introns are found in the genes of most organisms and many viruses and they can be located in both protein-coding genes and genes that function as RNA (noncoding genes).

In which group of introns does self-splicing occur?

splicing group I introns
A major class of introns is represented by the self-splicing group I introns. These introns are widespread but sporadically distributed in nature, and they are present in the genomes of some bacteria, mitochondria, chloroplasts, bacteriophages, and eukaryotic viruses, and in the nuclei of eukaryotic microorganisms [2].