Folding of the group I intron ribozyme from the 26S rRNA gene of Candida albicans

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Preincubation of the group I intron Ca.LSU from Candida albicans at 37°C in the absence of divalent cations results in partial folding of this intron. This is indicated by increased resistance to T1 ribonuclease cleavage of many G residues in most local helices, including P4-P6, as well as the non-local helix P7, where the G binding site is located. These changes correlate with increased gel mobility and activation of catalysis by precursor RNA containing this intron after preincubation. The presence of divalent cations or spermidine during preincubation results in formation of the predicted helices, as indicated by protection of additional G residues. However, addition of these cations during preincubation of the precursor RNA alters its gel mobility and eliminates the preincubation activation of precursor RNA seen in the absence of cations. These results suggest that, in the presence of divalent cations or spermidine, Ca.LSU folds into a more ordered, stable but misfolded conformation that is less able to convert into the catalytically active form than the ribozyme preincubated without cations. These results indicate that, like the group I intron of Tetrahymena, multiple folding pathways exist for Ca.LSU. However, it appears that the role cations play in the multiple folding pathways leading to the catalytically active form may differ between folding of these two group I introns.

Original languageEnglish (US)
Pages (from-to)2644-2653
Number of pages10
JournalNucleic Acids Research
Volume29
Issue number12
StatePublished - Jun 15 2001
Externally publishedYes

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Candida albicans
rRNA Genes
Introns
Cations
RNA Precursors
Divalent Cations
Spermidine
Gels
Ribonuclease T1
Tetrahymena
Catalytic RNA
Catalysis
Binding Sites
ribosomal RNA 26S
GIR1 ribozyme

ASJC Scopus subject areas

  • Genetics

Cite this

Folding of the group I intron ribozyme from the 26S rRNA gene of Candida albicans. / Zhang, Yi; Leibowitz, Michael J.

In: Nucleic Acids Research, Vol. 29, No. 12, 15.06.2001, p. 2644-2653.

Research output: Contribution to journalArticle

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abstract = "Preincubation of the group I intron Ca.LSU from Candida albicans at 37°C in the absence of divalent cations results in partial folding of this intron. This is indicated by increased resistance to T1 ribonuclease cleavage of many G residues in most local helices, including P4-P6, as well as the non-local helix P7, where the G binding site is located. These changes correlate with increased gel mobility and activation of catalysis by precursor RNA containing this intron after preincubation. The presence of divalent cations or spermidine during preincubation results in formation of the predicted helices, as indicated by protection of additional G residues. However, addition of these cations during preincubation of the precursor RNA alters its gel mobility and eliminates the preincubation activation of precursor RNA seen in the absence of cations. These results suggest that, in the presence of divalent cations or spermidine, Ca.LSU folds into a more ordered, stable but misfolded conformation that is less able to convert into the catalytically active form than the ribozyme preincubated without cations. These results indicate that, like the group I intron of Tetrahymena, multiple folding pathways exist for Ca.LSU. However, it appears that the role cations play in the multiple folding pathways leading to the catalytically active form may differ between folding of these two group I introns.",
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AB - Preincubation of the group I intron Ca.LSU from Candida albicans at 37°C in the absence of divalent cations results in partial folding of this intron. This is indicated by increased resistance to T1 ribonuclease cleavage of many G residues in most local helices, including P4-P6, as well as the non-local helix P7, where the G binding site is located. These changes correlate with increased gel mobility and activation of catalysis by precursor RNA containing this intron after preincubation. The presence of divalent cations or spermidine during preincubation results in formation of the predicted helices, as indicated by protection of additional G residues. However, addition of these cations during preincubation of the precursor RNA alters its gel mobility and eliminates the preincubation activation of precursor RNA seen in the absence of cations. These results suggest that, in the presence of divalent cations or spermidine, Ca.LSU folds into a more ordered, stable but misfolded conformation that is less able to convert into the catalytically active form than the ribozyme preincubated without cations. These results indicate that, like the group I intron of Tetrahymena, multiple folding pathways exist for Ca.LSU. However, it appears that the role cations play in the multiple folding pathways leading to the catalytically active form may differ between folding of these two group I introns.

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