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Mutual dependence of Candida albicans Est1p and Est3p in telomerase assembly and activation.

TitleMutual dependence of Candida albicans Est1p and Est3p in telomerase assembly and activation.
Publication TypeJournal Article
Year of Publication2007
AuthorsHsu M, Yu EYoung, Singh SM, Lue NF
JournalEukaryot Cell
Volume6
Issue8
Pagination1330-8
Date Published2007 Aug
ISSN1535-9778
KeywordsBase Sequence, Candida albicans, Fungal Proteins, Molecular Sequence Data, RNA, Telomerase
Abstract

Telomerase is an RNA-protein complex responsible for extending one strand of the telomere terminal repeats. Analysis of the telomerase complex in budding yeasts has revealed the presence of one catalytic protein subunit (Est2p/TERT) and at least two noncatalytic components (Est1p and Est3p). The TERT subunit is essential for telomerase catalysis, while the functions of Est1p and Est3p have not been precisely elucidated. In an earlier study, we showed that telomerase derived from a Candida est1-null mutant is defective in primer utilization in vitro; it exhibits reduced initiation and processivity on primers that terminate in two regions of the telomere repeat. Here we show that telomerase derived from a Candida est3-null mutant has nearly identical defects in primer utilization and processivity. Further analysis revealed an unexpected mutual dependence of Est1p and Est3p in their assembly into the full telomerase complex, which accounts for the similarity between the mutant enzymes. We also developed an affinity isolation and an in vitro reconstitution protocol for the telomerase complex that will facilitate future mechanistic studies.

DOI10.1128/EC.00069-07
Alternate JournalEukaryot Cell
PubMed ID17545315
PubMed Central IDPMC1951134
Grant ListR01 GM069507 / GM / NIGMS NIH HHS / United States
GM069507 / GM / NIGMS NIH HHS / United States

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