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Originally published In Press as doi:10.1074/jbc.M000622200 on May 12, 2000

J. Biol. Chem., Vol. 275, Issue 29, 22568-22573, July 21, 2000
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Telomerase Activity Reconstituted in Vitro with Purified Human Telomerase Reverse Transcriptase and Human Telomerase RNA Component*

Kenkichi MasutomiDagger §, Shuichi Kaneko§, Naoyuki HayashiDagger , Tatsuya YamashitaDagger §, Yukihiro ShirotaDagger §, Kenichi Kobayashi§, and Seishi MurakamiDagger

From the Dagger  Department of Molecular Biology, Division of Molecular Oncology, Cancer Research Institute and the § First Department of Internal Medicine, Medical School, Kanazawa University, Kanazawa 920-0934, Japan

Telomerase is a specialized reverse transcriptase that catalyzes elongation of the telomeric tandem repeat, TTAGGG, by addition of this sequence to the ends of existing telomeres. Human telomerase reverse transcriptase (hTERT) has been identified as a catalytic enzyme involved in telomere elongation that requires telomerase RNA, human telomerase RNA component (hTR), as an RNA template. We established a new method to express and purify soluble insect-expressed recombinant hTERT. The partially purified FLAG-hTERT retained the catalytic activity of telomerase in a complementation assay in vitro to exhibit telomerase activity in telomerase-negative TIG3 cell extract and in a reconstitution assay with FLAG-hTERT and purified hTR in vitro. FLAG-hTERT (D712A) with a mutation in the VDV motif exhibited no telomerase activity, confirming the authentic catalytic activity of FLAG-hTERT. The reconstituted complex of FLAG-hTERT and hTR in vitro was detected by electrophoretic mobility shift assay, and its activity was stimulated by more than 30-fold by TIG3 cell extract. This suggested that some cellular component(s) in the extract facilitated the reconstituted telomerase activity in vitro. Geldanamycin had no effect on the reconstituted activity but partially reduced the stimulated activity of the reconstituted telomerase by the TIG3 cell extract, suggesting that Hsp90 may contribute to the stimulatory effect of the cellular components.

* The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Dept. Molecular Biology, Division of Molecular Oncology, Cancer Research Institute, Kanazawa University, Takara-Machi 13-1, Kanazawa 920-0934, Japan. Tel.: 81-76-265-2731; Fax: 81-76-234-4501; E-mail: semuraka@kenroku.kanazawa-u.ac.jp.

Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.
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