NDLI: Studies of point mutants define three essential paired nucleotides in the domain 5 substructure of a group II intron.

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Studies of point mutants define three essential paired nucleotides in the domain 5 substructure of a group II intron.

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Studies of point mutants define three essential paired nucleotides in the domain 5 substructure of a group II intron.

Content Provider	PubMed Central
Author	Boulanger, S. C. Belcher, S. M. Schmidt, U. Dib-hajj, S. D. Schmidt, T. Perlman, P. S.
Abstract	Domain 5 (D5) is a highly conserved, largely helical substructure of group II introns that is essential for self-splicing. Only three of the 14 base pairs present in most D5 structures (A2.U33, G3.U32, and C4.G31) are nearly invariant. We have studied effects of point mutations of those six nucleotides on self-splicing and in vivo splicing of aI5 gamma, an intron of the COXI gene of Saccharomyces cerevisiae mitochondria. Though none of the point mutations blocked self-splicing under one commonly used in vitro reaction condition, the most debilitating mutations were at G3 and G4. Following mitochondrial Biolistic transformation, it was found that mutations at A2, G3, and C4 blocked respiratory growth and splicing while mutations at the other sites had little effect on either phenotype. Intra-D5 second-site suppressors showed that pairing between nucleotides at positions 2 and 33 and 4 and 31 is especially important for D5 function. At the G3.U32 wobble pair, the mutant A.U pair blocks splicing, but a revertant of that mutant that can form an A+.C base pair regains some splicing. A dominant nuclear suppressor restores some splicing to the G3A mutant but not the G3U mutant, suggesting that a purine is required at position 3. These findings are discussed in terms of the hypothesis of Madhani and Guthrie (H. D. Madhani and C. Guthrie, Cell 71:803-817, 1992) that helix 1 formed between yeast U2 and U6 small nuclear RNAs may be the spliceosomal cognate of D5.
Starting Page	4479
File Format	PDF
ISSN	10985549
e-ISSN	10985549
Journal	Molecular and Cellular Biology
Issue Number	8
Volume Number	15
Language	English
Publisher Date	1995-08-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology

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