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Related Experiment Videos

Telomerase: biochemical considerations for enzyme and substrate.

Colleen Kelleher1, M Teresa Teixeira, Klaus Förstemann

  • 1Swiss Institute for Experimental Cancer Research (ISREC), CH-1066 Epalinges, Switzerland.

Trends in Biochemical Sciences
|November 6, 2002
PubMed
Summary

Telomerase (TERT) extends chromosome ends using its RNA template. Guanine-rich structures may facilitate repeat addition by repositioning the RNA template and DNA substrate within the active site.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Telomerase is a key enzyme responsible for maintaining chromosome ends (telomeres).
  • It functions through reverse transcription of an internal RNA template.
  • Understanding telomerase's mechanism is crucial for aging and cancer research.

Purpose of the Study:

  • To elucidate the mechanistic steps involved in telomeric repeat addition by telomerase.
  • To identify the roles of specific telomerase reverse transcriptase (TERT) sub-domains.
  • To explore the potential involvement of secondary structures in telomere synthesis.

Main Methods:

  • Analysis of telomerase activity and processivity.
  • Biochemical assays to study substrate and template interactions.

Related Experiment Videos

  • Structural studies of telomerase reverse transcriptase (TERT) domains.
  • Investigation of nascent DNA product structures.

    • Main Results:

    • Telomerase reverse transcriptase (TERT) sub-domains coordinate iterative repeat addition.
    • A repositioning step involving RNA template and DNA substrate is essential after each repeat.
    • Guanine-rich secondary structures in the nascent product may facilitate this repositioning.
    • Telomerase likely functions as a multimer with cooperative active sites.

    Conclusions:

    • Telomerase utilizes a complex, multi-step process involving TERT sub-domains and potential secondary structures.
    • The enzyme's mechanism ensures accurate and iterative extension of chromosome ends.
    • Understanding telomere maintenance is vital for therapeutic strategies targeting cancer and aging.