2p2r | pdb_00002p2r
Crystal structure of the third KH domain of human Poly(C)-Binding Protein-2 in complex with C-rich strand of human telomeric DNA
Structural highlights
FunctionPCBP2_HUMAN Single-stranded nucleic acid binding protein that binds preferentially to oligo dC. Major cellular poly(rC)-binding protein. Binds also poly(rU). Negatively regulates cellular antiviral responses mediated by MAVS signaling. It acts as an adapter between MAVS and the E3 ubiquitin ligase ITCH, therefore triggering MAVS ubiquitinationa and degradation.[1] 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 PubMedKH (hnRNP K homology) domains, consisting of approximately 70 amino acid residues, are present in a variety of nucleic-acid-binding proteins. Among these are poly(C)-binding proteins (PCBPs), which are important regulators of mRNA stability and posttranscriptional regulation in general. All PCBPs contain three different KH domains and recognize poly(C)-sequences with high affinity and specificity. To reveal the molecular basis of poly(C)-sequence recognition, we have determined the crystal structure, at 1.6 A resolution, of PCBP2 KH3 domain in complex with a 7-nt DNA sequence (5'-AACCCTA-3') corresponding to one repeat of the C-rich strand of human telomeric DNA. The domain assumes a type-I KH fold in a betaalphaalphabetabetaalpha configuration. The protein-DNA interface could be studied in unprecedented detail and is made up of a series of direct and water-mediated hydrogen bonds between the protein and the DNA, revealing an especially dense network involving several structural water molecules for the last 2 nt in the core recognition sequence. Unlike published KH domain structures, the protein crystallizes without protein-protein contacts, yielding new insights into the dimerization properties of different KH domains. A nucleotide platform, an interesting feature found in some RNA molecules, was identified, evidently for the first time in DNA. Crystal structure of the third KH domain of human poly(C)-binding protein-2 in complex with a C-rich strand of human telomeric DNA at 1.6 A resolution.,Fenn S, Du Z, Lee JK, Tjhen R, Stroud RM, James TL Nucleic Acids Res. 2007;35(8):2651-60. Epub 2007 Apr 10. PMID:17426136[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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