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Template requirements for telomerase translocation in Kluyveromyces lactis

Item Type:Article
Title:Template requirements for telomerase translocation in Kluyveromyces lactis
Creators Name:Underwood, D.H. and Zinzen, R.P. and McEachern, M.J.
Abstract:Telomeres are synthesized by telomerase, a specialized reverse transcriptase, which contains a template in its intrinsic RNA component. In Kluyveromyces lactis, the repeats synthesized by the wild-type telomerase are 25 nucleotides (nt) in length and uniform in sequence. To determine the role of the 5-nt repeats defining the ends of the K. lactis telomerase RNA template in telomerase translocation, we have made mutations in and around them and observed their effects on telomere length and the sequence of newly made telomeric repeats. These template mutations typically result in telomeres that are shorter than those of wild-type cells. The mismatches between the telomerase template and the telomeric tip that occur after telomerase-mediated incorporation of the mutations are normally not removed. Instead, the mutations lead to the synthesis of aberrant repeats that range in size from 31 to 13 bp. Therefore, the specificity with which the telomeric tip aligns with the telomere is critical for the production of the uniform repeats seen in K. lactis. In addition, the region immediately 3' of the template may play an important role in translocation of the enzyme.
Keywords:Active Biological Transport, Bacterial DNA, Bacterial Genes, Bacterial RNA, Base Pair Mismatch, Base Sequence, Kluyveromyces, Molecular Sequence Data, Mutation, Telomerase, Terminal Repeat Sequences
Source:Molecular and Cellular Biology
Publisher:American Society for Microbiology
Page Range:912-923
Date:January 2004
PubMed:View item in PubMed

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