1ph5 | pdb_00001ph5

CRYSTAL STRUCTURE OF THE OXYTRICHA NOVA TELOMERE END-BINDING PROTEIN COMPLEXED WITH NONCOGNATE SSDNA GGGGTTTTG(3DR)GG

spinqualitylabelsall models 1ph5, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ph5 is a 5 chain structure with sequence from Ciliate. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, NA NonStd Res: 3DR Related: 1otc, 1jb7, 1kix, 1k8g, 1pa6, 1ph1, 1ph2, 1ph3, 1ph4, 1ph6, 1ph7, 1ph8, 1ph9, 1phj Gene: MAC-56A AND MAC-56K AND MAC-56S (Ciliate), MAC-41A AND MAC-41S (Ciliate) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [TEBB_OXYNO] May function as protective capping of the single-stranded telomeric overhang. May also participate in telomere length regulation during DNA replication. Binds specifically to the T4G4-containing extension on the 3'strand and protects this region of the telomere from nuclease digestion and chemical modification. [TEBA_OXYNO] May function as protective capping of the single-stranded telomeric overhang. May also participate in telomere length regulation during DNA replication. Binds specifically to the T4G4-containing extension on the 3'strand and protects this region of the telomere from nuclease digestion and chemical modification. 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 PubMed Sequence-specific protein recognition of single-stranded nucleic acids is critical for many fundamental cellular processes, such as DNA replication, DNA repair, transcription, translation, recombination, apoptosis and telomere maintenance. To explore the mechanisms of sequence-specific ssDNA recognition, we determined the crystal structures of 10 different non-cognate ssDNAs complexed with the Oxytricha nova telomere end-binding protein (OnTEBP) and evaluated their corresponding binding affinities (PDB ID codes 1PH1-1PH9 and 1PHJ). The thermodynamic and structural effects of these sequence perturbations could not have been predicted based solely upon the cognate structure. OnTEBP accommodates non-cognate nucleotides by both subtle adjustments and surprisingly large structural rearrangements in the ssDNA. In two complexes containing ssDNA intermediates that occur during telomere extension by telomerase, entire nucleotides are expelled from the complex. Concurrently, the sequence register of the ssDNA shifts to re-establish a more cognate-like pattern. This phenomenon, termed nucleotide shuffling, may be of general importance in protein recognition of single-stranded nucleic acids. This set of structural and thermodynamic data highlights a fundamental difference between protein recognition of ssDNA versus dsDNA. Nucleotide shuffling and ssDNA recognition in Oxytricha nova telomere end-binding protein complexes.,Theobald DL, Schultz SC EMBO J. 2003 Aug 15;22(16):4314-24. PMID:12912928 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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