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Solution structure of the Arabidopsis thaliana telomeric repeat-binding protein DNA binding domainSolution structure of the Arabidopsis thaliana telomeric repeat-binding protein DNA binding domain
Structural highlights
FunctionTRP1_ARATH Binds specifically to the plant telomeric double-stranded DNA sequences 5'-GGTTTAG-3'. At least 4 repeats of telomeric sequences are required for binding. Induces DNA bending. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe double-stranded telomeric repeat-binding protein (TRP) AtTRP1 is isolated from Arabidopsis thaliana. Using gel retardation assays, we defined the C-terminal 97 amino acid residues, Gln464 to Val560 (AtTRP1(464-560)), as the minimal structured telomeric repeat-binding domain. This region contains a typical Myb DNA-binding motif and a C-terminal extension of 40 amino acid residues. The monomeric AtTRP1(464-560) binds to a 13-mer DNA duplex containing a single repeat of an A.thaliana telomeric DNA sequence (GGTTTAG) in a 1:1 complex, with a K(D) approximately 10(-6)-10(-7) M. Nuclear magnetic resonance (NMR) examination revealed that the solution structure of AtTRP1(464-560) is a novel four-helix tetrahedron rather than the three-helix bundle structure found in typical Myb motifs and other TRPs. Binding of the 13-mer DNA duplex to AtTRP1(464-560) induced significant chemical shift perturbations of protein amide resonances, which suggests that helix 3 (H3) and the flexible loop connecting H3 and H4 are essential for telomeric DNA sequence recognition. Furthermore, similar to that in hTRF1, the N-terminal arm likely contributes to or stabilizes DNA binding. Sequence comparisons suggested that the four-helix structure and the involvement of the loop residues in DNA binding may be features unique to plant TRPs. Solution structure of the Arabidopsis thaliana telomeric repeat-binding protein DNA binding domain: a new fold with an additional C-terminal helix.,Sue SC, Hsiao HH, Chung BC, Cheng YH, Hsueh KL, Chen CM, Ho CH, Huang TH J Mol Biol. 2006 Feb 10;356(1):72-85. Epub 2005 Nov 22. PMID:16337232[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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