Definition of a spliceosome interaction domain in yeast Prp2 ATPase
The Saccharomyces cerevisiae splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2 binds to the spliceosome in the absence of ATP and is released following ATP hydrolysis. It contains three domains: a unique N-terminal domai...
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Published in | RNA (Cambridge) Vol. 10; no. 2; pp. 210 - 220 |
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Abstract | The Saccharomyces cerevisiae splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2 binds to the spliceosome in the absence of ATP and is released following ATP hydrolysis. It contains three domains: a unique N-terminal domain, a helicase domain that is highly conserved in the DExD/H protein family, and a C-terminal domain that is conserved in spliceosomal DEAH proteins Prp2, Prp16, Prp22, and Prp43. We examined the role of each domain of Prp2 by deletion mutagenesis. Whereas deletions of either the helicase or C-terminal domain are lethal, deletions in the N-terminal domain have no detectable effect on Prp2 activity. Overexpression of the C-terminal domain of Prp2 exacerbates the temperature-sensitive phenotype of a prp2(Ts) strain, suggesting that the C-domain interferes with the activity of the Prp2(Ts) protein. A genetic approach was then taken to study interactions between Prp2 and the spliceosome. Previously, we isolated dominant negative mutants in the helicase domain of Prp2 that inhibit the activity of wild-type Prp2 when the mutant protein is overexpressed. We mutagenized one prp2 release mutant gene and screened for loss of dominant negative function. Several weak binding mutants were isolated and mapped to the C terminus of Prp2, further indicating the importance of the C terminus in spliceosome binding. This study is the first to indicate that amino acid substitutions outside the helicase domain can abolish spliceosome contact and splicing activity of a spliceosomal DEAH protein. |
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AbstractList | The
Saccharomyces cerevisiae
splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2 binds to the spliceosome in the absence of ATP and is released following ATP hydrolysis. It contains three domains: a unique N-terminal domain, a helicase domain that is highly conserved in the DExD/H protein family, and a C-terminal domain that is conserved in spliceosomal DEAH proteins Prp2, Prp16, Prp22, and Prp43. We examined the role of each domain of Prp2 by deletion mutagenesis. Whereas deletions of either the helicase or C-terminal domain are lethal, deletions in the N-terminal domain have no detectable effect on Prp2 activity. Overexpression of the C-terminal domain of Prp2 exacerbates the temperature-sensitive phenotype of a
prp2
Ts
strain, suggesting that the C-domain interferes with the activity of the Prp2
Ts
protein. A genetic approach was then taken to study interactions between Prp2 and the spliceosome. Previously, we isolated dominant negative mutants in the helicase domain of Prp2 that inhibit the activity of wild-type Prp2 when the mutant protein is overexpressed. We mutagenized one
prp2
release mutant gene and screened for loss of dominant negative function. Several weak binding mutants were isolated and mapped to the C terminus of Prp2, further indicating the importance of the C terminus in spliceosome binding. This study is the first to indicate that amino acid substitutions outside the helicase domain can abolish spliceosome contact and splicing activity of a spliceosomal DEAH protein. The Saccharomyces cerevisiae splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2 binds to the spliceosome in the absence of ATP and is released following ATP hydrolysis. It contains three domains: a unique N-terminal domain, a helicase domain that is highly conserved in the DExD/H protein family, and a C-terminal domain that is conserved in spliceosomal DEAH proteins Prp2, Prp16, Prp22, and Prp43. We examined the role of each domain of Prp2 by deletion mutagenesis. Whereas deletions of either the helicase or C-terminal domain are lethal, deletions in the N-terminal domain have no detectable effect on Prp2 activity. Overexpression of the C-terminal domain of Prp2 exacerbates the temperature-sensitive phenotype of a prp2(Ts) strain, suggesting that the C-domain interferes with the activity of the Prp2(Ts) protein. A genetic approach was then taken to study interactions between Prp2 and the spliceosome. Previously, we isolated dominant negative mutants in the helicase domain of Prp2 that inhibit the activity of wild-type Prp2 when the mutant protein is overexpressed. We mutagenized one prp2 release mutant gene and screened for loss of dominant negative function. Several weak binding mutants were isolated and mapped to the C terminus of Prp2, further indicating the importance of the C terminus in spliceosome binding. This study is the first to indicate that amino acid substitutions outside the helicase domain can abolish spliceosome contact and splicing activity of a spliceosomal DEAH protein. The Saccharomyces cerevisiae splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2 binds to the spliceosome in the absence of ATP and is released following ATP hydrolysis. It contains three domains: a unique N-terminal domain, a helicase domain that is highly conserved in the DExD/H protein family, and a C-terminal domain that is conserved in spliceosomal DEAH proteins Prp2, Prp16, Prp22, and Prp43. We examined the role of each domain of Prp2 by deletion mutagenesis. Whereas deletions of either the helicase or C-terminal domain are lethal, deletions in the N-terminal domain have no detectable effect on Prp2 activity. Overexpression of the C-terminal domain of Prp2 exacerbates the temperature-sensitive phenotype of a prp2 super(Ts) strain, suggesting that the C-domain interferes with the activity of the Prp2 super(Ts) protein. A genetic approach was then taken to study interactions between Prp2 and the spliceosome. Previously, we isolated dominant negative mutants in the helicase domain of Prp2 that inhibit the activity of wild-type Prp2 when the mutant protein is overexpressed. We mutagenized one prp2 release mutant gene and screened for loss of dominant negative function. Several weak binding mutants were isolated and mapped to the C terminus of Prp2, further indicating the importance of the C terminus in spliceosome binding. This study is the first to indicate that amino acid substitutions outside the helicase domain can abolish spliceosome contact and splicing activity of a spliceosomal DEAH protein. |
Author | Kim, Dong-Ho Edwalds-Gilbert, Gretchen Silverman, Edward Lin, Ren-Jang |
AuthorAffiliation | 3 Graduate School of Biological Sciences, City of Hope, Duarte, California 91010, USA 1 Division of Molecular Biology, Beckman Research Institute of the City of Hope, Duarte, California 91010, USA 2 W.M. Keck Science Center of the Claremont Colleges, Claremont, California 91711, USA |
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Notes | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 Reprint requests to: Ren-Jang Lin, 1450 E. Duarte Road, Duarte, CA 91010, USA; e-mail: rlin@coh.org. Article and publication are at http://www.rnajournal.org/cgi/doi/10.1261/rna.5151404. |
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Snippet | The Saccharomyces cerevisiae splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2... The Saccharomyces cerevisiae splicing factor Prp2 is an RNA-dependent ATPase required before the first transesterification reaction in pre-mRNA splicing. Prp2... |
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SubjectTerms | Amino Acid Sequence DEAD-box RNA Helicases Galactose - metabolism Molecular Sequence Data Protein Structure, Tertiary prp2 gene RNA Splicing - physiology Saccharomyces cerevisiae Saccharomyces cerevisiae - genetics Saccharomyces cerevisiae - metabolism Saccharomyces cerevisiae Proteins - metabolism Spliceosomes - metabolism |
Title | Definition of a spliceosome interaction domain in yeast Prp2 ATPase |
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