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HOT1 is a mammalian direct telomere repeat-binding protein contributing to telomerase recruitment

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons77831

Butter,  Falk
Mann, Matthias / Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons77736

Benda,  Christian
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons78974

Scheibe,  Marion
Mann, Matthias / Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons77712

Basquin,  Claire
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons78356

Mann,  Matthias
Mann, Matthias / Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Max Planck Society;

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Zitation

Kappei, D., Butter, F., Benda, C., Scheibe, M., Draskovic, I., Stevense, M., et al. (2013). HOT1 is a mammalian direct telomere repeat-binding protein contributing to telomerase recruitment. EMBO JOURNAL, 32(12), 1681-1701. doi:10.1038/emboj.2013.105.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-FD6D-E
Zusammenfassung
Telomeres are repetitive DNA structures that, together with the shelterin and the CST complex, protect the ends of chromosomes. Telomere shortening is mitigated in stem and cancer cells through the de novo addition of telomeric repeats by telomerase. Telomere elongation requires the delivery of the telomerase complex to telomeres through a not yet fully understood mechanism. Factors promoting telomerase-telomere interaction are expected to directly bind telomeres and physically interact with the telomerase complex. In search for such a factor we carried out a SILAC-based DNA-protein interaction screen and identified HMBOX1, hereafter referred to as homeobox telomere-binding protein 1 (HOT1). HOT1 directly and specifically binds double-stranded telomere repeats, with the in vivo association correlating with binding to actively processed telomeres. Depletion and overexpression experiments classify HOT1 as a positive regulator of telomere length. Furthermore, immunoprecipitation and cell fractionation analyses show that HOT1 associates with the active telomerase complex and promotes chromatin association of telomerase. Collectively, these findings suggest that HOT1 supports telomerase-dependent telomere elongation.