Reference: Tharun S, et al. (2005) Mutations in the Saccharomyces cerevisiae LSM1 gene that affect mRNA decapping and 3' end protection. Genetics 170(1):33-46

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Abstract


The decapping of eukaryotic mRNAs is a key step in their degradation. The heteroheptameric Lsm1p-7p complex is a general activator of decapping and also functions in protecting the 3' ends of deadenylated mRNAs from a 3'-trimming reaction. Lsm1p is the unique member of the Lsm1p-7p complex, distinguishing that complex from the functionally different Lsm2p-8p complex. To understand the function of Lsm1p, we constructed a series of deletion and point mutations of the LSM1 gene and examined their effects on phenotype. These studies revealed the following: (i) Mutations affecting the predicted RNA-binding and inter-subunit interaction residues of Lsm1p led to impairment of mRNA decay, suggesting that the integrity of the Lsm1p-7p complex and the ability of the Lsm1p-7p complex to interact with mRNA are important for mRNA decay function; (ii) mutations affecting the predicted RNA contact residues did not affect the localization of the Lsm1p-7p complex to the P-bodies; (iii) mRNA 3'-end protection could be indicative of the binding of the Lsm1p-7p complex to the mRNA prior to activation of decapping, since all the mutants defective in mRNA 3' end protection were also blocked in mRNA decay; and (iv) in addition to the Sm domain, the C-terminal domain of Lsm1p is also important for mRNA decay function.

Reference Type
Journal Article | Research Support, N.I.H., Extramural | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
Authors
Tharun S, Muhlrad D, Chowdhury A, Parker R
Primary Lit For
LSM1 | LSM1-7-PAT1 complex | LSM1-7 complex

Gene Ontology Annotations 2 entries for 2 genes


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Gene/ComplexQualifierGene Ontology TermAnnotation ExtensionEvidenceSourceAssigned On
LSM1-7-PAT1 complexinvolved indeadenylation-dependent decapping of nuclear-transcribed mRNAIMPComplexPortal2015-06-29
LSM1-7 complexinvolved indeadenylation-dependent decapping of nuclear-transcribed mRNAIMPComplexPortal2015-04-10
Showing 1 to 2 of 2 entries