Results 51 to 60 of about 838,914 (323)
Organellar Introns in Fungi, Algae, and Plants
Cells, 2021 Introns are ubiquitous in eukaryotic genomes and have long been considered as ‘junk RNA’ but the huge energy expenditure in their transcription, removal, and degradation indicate that they may have functional significance and can offer evolutionary ...
Jigeesha Mukhopadhyay, Georg Hausner
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Evolution of group II introns [PDF]
Mobile DNA, 2015 Present in the genomes of bacteria and eukaryotic organelles, group II introns are an ancient class of ribozymes and retroelements that are believed to have been the ancestors of nuclear pre-mRNA introns. Despite long-standing speculation, there is limited understanding about the actual pathway by which group II introns evolved into eukaryotic introns.
Zimmerly, Steven, Semper, Cameron
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Frontiers in Microbiology, 2022 Group II introns (G2Is) are ribozymes that have retroelement characteristics in prokaryotes. Although G2Is are suggested to have been an important evolutionary factor in the prokaryote-to-eukaryote transition, comprehensive analyses of these introns ...
Masahiro C. Miura +9 more
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The brown algae Pl.LSU/2 group II intron-encoded protein has functional reverse transcriptase and maturase activities. [PDF]
PLoS ONE, 2013 Group II introns are self-splicing mobile elements found in prokaryotes and eukaryotic organelles. These introns propagate by homing into precise genomic locations, following assembly of a ribonucleoprotein complex containing the intron-encoded protein ...
Madeleine Zerbato +5 more
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Structure determination of group II introns [PDF]
Methods, 2017 Group II introns are self-splicing catalytic RNAs that are able to excise themselves from pre-mRNAs using a mechanism identical to that utilized by the spliceosome. Both structural and phylogenetic data support the hypothesis that group II introns and the spliceosome share a common ancestor.
Timothy Wiryaman, Navtej Toor
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BMC Ecology and Evolution, 2023 Group II introns are common in the two endosymbiotic organelle genomes of the plant lineage. Chloroplasts harbor 22 positionally conserved group II introns whereas their occurrence in land plant (embryophyte) mitogenomes is highly variable and specific ...
Simon Zumkeller, Volker Knoop
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Excision of Group II Introns as Circles [PDF]
Molecular Cell, 2001 Group II introns are usually removed from precursor RNAs as lariats comprised of a circular component and a short 3' tail. We find that group II introns can also be excised as complete circles. Circle formation requires release of the 3' exon of a splicing substrate, apparently by a trans splicing mechanism.
Vincent W. Coljee +6 more
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A Highly Proliferative Group IIC Intron from Geobacillus stearothermophilus Reveals New Features of Group II Intron Mobility and Splicing. [PDF]
J Mol Biol, 2018 Mohr G +7 more
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Unraveling the role of the enigmatic MatK maturase in chloroplast group IIA intron excision
Plant Direct, 2020 Maturases are prokaryotic enzymes that aid self‐excision of introns in precursor RNAs and have evolutionary ties to the nuclear spliceosome. Both the mitochondria and chloroplast, due to their prokaryotic origin, encode a single intron maturase, MatR for
Michelle M. Barthet +2 more
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Host Factors Influencing the Retrohoming Pathway of Group II Intron RmInt1, Which Has an Intron-Encoded Protein Naturally Devoid of Endonuclease Activity. [PDF]
PLoS ONE, 2016 Bacterial group II introns are self-splicing catalytic RNAs and mobile retroelements that have an open reading frame encoding an intron-encoded protein (IEP) with reverse transcriptase (RT) and RNA splicing or maturase activity.
Rafael Nisa-Martínez +2 more
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