Functional characterization of domains in AtTRB1, a putative telomere-binding protein in Arabidopsis thaliana |
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Authors: | Mozgová Iva Schrumpfová Petra Procházková Hofr Ctirad Fajkus Jirí |
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Institution: | Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic. |
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Abstract: | Telomeres are nucleoprotein structures ensuring the stability of eukaryotic chromosome ends. Two protein families, TRFL (TFL-Like) and SMH (Single-Myb-Histone), containing a specific telobox motif in their Myb domain, have been identified as potential candidates involved in a functional nucleoprotein structure analogous to human "shelterin" at plant telomeres. We analyze the DNA-protein interaction of the full-length and truncated variants of AtTRB1, a SMH-family member with a typical structure: N-terminal Myb domain, central H1/5 domain and C-terminal coiled-coil. We show that preferential interaction of AtTRB1 with double-stranded telomeric DNA is mediated by the Myb domain, while the H1/5 domain is involved in non-specific DNA-protein interaction and in the multimerization of AtTRB1. |
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Keywords: | Plant Arabidopsis thaliana Telomere Single-Myb-Histone protein AtTRB1 DNA-protein interaction EMSA PFO-ELFO |
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