Publications by authors named "Julia V Ponomarenko"

The specific binding of transcription factors to cognate sequence elements is thought to be critical for the generation of specific gene expression programs. Members of the nuclear factor κB (NF-κB) and interferon (IFN) regulatory factor (IRF) transcription factor families bind to the κB site and the IFN response element (IRE), respectively, of target genes, and they are activated in macrophages after exposure to pathogens. However, how these factors produce pathogen-specific inflammatory and immune responses remains poorly understood.

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Background: The ability to predict antibody binding sites (aka antigenic determinants or B-cell epitopes) for a given protein is a precursor to new vaccine design and diagnostics. Among the various methods of B-cell epitope identification X-ray crystallography is one of the most reliable methods. Using these experimental data computational methods exist for B-cell epitope prediction.

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Background: Structural information about epitopes, particularly the three-dimensional (3D) structures of antigens in complex with immune receptors, presents a valuable source of data for immunology. This information is available in the Protein Data Bank (PDB) and provided in curated form by the Immune Epitope Database and Analysis Resource (IEDB). With continued growth in these data and the importance in understanding molecular level interactions of immunological interest there is a need for new specialized molecular visualization and analysis tools.

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A B-cell epitope is the three-dimensional structure within an antigen that can be bound to the variable region of an antibody. The prediction of B-cell epitopes is highly desirable for various immunological applications, but has presented a set of unique challenges to the bioinformatics and immunology communities. Improving the accuracy of B-cell epitope prediction methods depends on a community consensus on the data and metrics utilized to develop and evaluate such tools.

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Epitopes are defined as parts of antigens interacting with receptors of the immune system. Knowledge about their intrinsic structure and how they affect the immune response is required to continue development of techniques that detect, monitor, and fight diseases. Their scientific importance is reflected in the vast amount of epitope-related information gathered, ranging from interactions between epitopes and major histocompatibility complex molecules determined by X-ray crystallography to clinical studies analyzing correlates of protection for epitope based vaccines.

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A planned repository of immune epitope data with associated analysis tools should be a boon to vaccine development

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Accompanying the discovery of an increasing number of proteins, there is the need to provide functional annotation that is both highly accurate and consistent. The Gene Ontology (GO) provides consistent annotation in a computer readable and usable form; hence, GO annotation (GOA) has been assigned to a large number of protein sequences based on direct experimental evidence and through inference determined by sequence homology. Here we show that this annotation can be extended and corrected for cases where protein structures are available.

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Article Synopsis
  • Analyzing gene regulatory networks is a complex challenge in postgenomic research, with a focus on transcription factor (TF) binding sites that can impact disease phenotypes.
  • The rSNP_Guide system helps predict these TF binding sites and has been validated by established connections between TF sites and diseases, as well as experimental data.
  • The tool identifies potential TF sites in similar genes based on known alterations, classifying their TF-DNA interactions as 'present', 'weak', or 'absent', with statistical significance for each classification.
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Intensive growth in 3D structure data on DNA-protein complexes as reflected in the Protein Data Bank (PDB) demands new approaches to the annotation and characterization of these data and will lead to a new understanding of critical biological processes involving these data. These data and those from other protein structure classifications will become increasingly important for the modeling of complete proteomes. We propose a fully automated classification of DNA-binding protein domains based on existing 3D-structures from the PDB.

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Article Synopsis
  • The human genome sequencing has spurred significant advancements in bioinformatics, particularly in analyzing single nucleotide polymorphisms (SNPs).
  • rSNP_Guide is a developed tool that predicts transcription factor binding sites based on DNA sequence alterations, which may relate to diseases.
  • The system has been validated using various genes linked to diseases and has shown effectiveness in analyzing important SNPs in both human and mouse genes.
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  • SELEX_DB is an online resource that provides experimental data on in vitro selected DNA/RNA oligomers (aptamers) and tools for recognizing these sequences.
  • The new version includes a supplemental database, SYSTEM, which details the experimental design, and SELEX_TOOLS, an applet package for using this data in genomic annotation.
  • Cross-validation tests revealed that recognition accuracy improves with higher similarity between training and test sets of protein binding sequences, showing varying accuracy levels for natural sites, nearest homologs, and distant homologs.
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