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Plant Molecular Biology

, Volume 60, Issue 5, pp 633–646 | Cite as

Asparagales Telomerases which Synthesize the Human Type of Telomeres

  • Eva Sýkorová
  • Andrew Rowland Leitch
  • Jiří Fajkus
Article

Abstract

The order of monocotyledonous plants Asparagales is attractive for studies of telomere evolution as it includes three phylogenetically distinct groups with telomeres composed of TTTAGGG (Arabidopsis-type), TTAGGG (human-type) and unknown alternative sequences, respectively. To analyze the molecular causes of these switches in telomere sequence (synthesis), genes coding for the catalytic telomerase subunit (TERT) of representative species in the first two groups have been cloned. Multiple alignments of the sequences, together with other TERT sequences in databases, suggested candidate amino acid substitutions grouped in the Asparagales TERT synthesizing the human-type repeat that could have contributed to the changed telomere sequence. Among these, mutations in the C motif are of special interest due to its functional importance in TERT. Furthermore, two different modes of initial elongation of the substrate primer were observed in Asparagales telomerases producing human-like repeats, which could be attributed to interactions between the telomerase RNA subunit (TR) and the substrate.

Keywords

Asparagales evolution telomerase template region 

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Copyright information

© Springer 2006

Authors and Affiliations

  • Eva Sýkorová
    • 1
  • Andrew Rowland Leitch
    • 2
  • Jiří Fajkus
    • 1
    • 3
  1. 1.Laboratory of DNA-Molecular Complexes, Institute of BiophysicsAcademy of Sciences of the Czech RepublicBrnoCzech Republic
  2. 2.School of Biological SciencesQueen Mary University of LondonLondonUK
  3. 3.Department of Functional Genomics and ProteomicsMasaryk University BrnoBrnoCzech Republic

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