structure prediction

结构预测
  • 文章类型: Journal Article
    研究序列及其相应的三维结构之间的关系有助于结构生物学家解决蛋白质折叠问题。尽管有几种实验和计算机模拟方法,仍然从序列中理解或解码三维结构仍然是一个谜。在这种情况下,结构预测的准确性起着不可或缺的作用。为了解决这个问题,已创建更新的Web服务器(CSSP-2.0),以通过部署现有算法来提高我们以前版本的CSSP的准确性。它使用输入作为概率,并将二级结构的共识预测为高度精确的三态Q3(螺旋,strand,和线圈)。这个预测是使用六种最近表现最好的方法来实现的:MUFOLD-SS,RaptorX,PSSpredv4,PSIPRED,JPredv4和Porter5.0。CSSP-2.0验证包括涉及来自PDB的各种蛋白质类别的数据集,CullPDB,和AlphaFold数据库。我们的结果表明,共识Q3预测的准确性有了显著提高。使用CSSP-2.0,晶体学可以从整个复杂结构中挑选出稳定的规则二级结构,这将有助于推断假设蛋白质的功能注释。Web服务器可在https://bioserver3免费获得。物理。iisc.AC.in/cgi-bin/cssp-2/.
    Studying the relationship between sequences and their corresponding three-dimensional structure assists structural biologists in solving the protein-folding problem. Despite several experimental and in-silico approaches, still understanding or decoding the three-dimensional structures from the sequence remains a mystery. In such cases, the accuracy of the structure prediction plays an indispensable role. To address this issue, an updated web server (CSSP-2.0) has been created to improve the accuracy of our previous version of CSSP by deploying the existing algorithms. It uses input as probabilities and predicts the consensus for the secondary structure as a highly accurate three-state Q3 (helix, strand, and coil). This prediction is achieved using six recent top-performing methods: MUFOLD-SS, RaptorX, PSSpred v4, PSIPRED, JPred v4, and Porter 5.0. CSSP-2.0 validation includes datasets involving various protein classes from the PDB, CullPDB, and AlphaFold databases. Our results indicate a significant improvement in the accuracy of the consensus Q3 prediction. Using CSSP-2.0, crystallographers can sort out the stable regular secondary structures from the entire complex structure, which would aid in inferring the functional annotation of hypothetical proteins. The web server is freely available at https://bioserver3.physics.iisc.ac.in/cgi-bin/cssp-2/.
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  • 文章类型: Journal Article
    猴痘病毒(MPX)属于Poxviridae家族的正痘病毒属,在非洲部分地区流行,并在人类中引起类似天花的疾病。最近的MPX疫情已经影响到110个国家,自2022年5月以来,已确诊病例86,956例,因此已成为人们关注的焦点。特别是,对病毒的分子理解对于研究感染过程和病原体-宿主相互作用至关重要,预测向性变化,或在非常早期的阶段指导药物开发和药物发现以及疫苗开发或疫苗适应。在这里,我们对目前正在流行的MPX的结构蛋白质组进行了研究:我们对爆发后一年内采样的3,713个基因组序列进行了一致分析,发现了10,580个特征性候选开放阅读框(ORF).在非冗余蛋白质数据库中的搜索将可疑ORF的数量减少到1,079个,其中210个是典型的MPX参考基因组中的代表性蛋白质。这应该作为目前传播的MPX中推定的蛋白质的集合,一种可以支持及时发现药物的信息组合,突变分析,和疫苗开发。我们,在这里,通过提供210种蛋白质的原子3D模型,呈现迄今为止最全面的结构蛋白质组,用三种最先进的结构预测方法生成,包括蛋白质组的突变分析,特别关注tecovirimat和brincidofovir的药物结合位点。重要性2022年爆发的猴痘病毒已经涉及,截至2023年4月,110个国家有86,956例确诊病例和119例死亡。在分子水平上了解新出现的疾病对于研究感染过程并最终指导早期药物发现至关重要。为了支持这一点,我们提供了迄今为止最全面的猴痘病毒结构蛋白质组,其中包括210个结构模型,每种都使用三种最先进的结构预测方法进行计算。而不是建立在单基因组序列上,我们从疫情爆发后1年内从患者中抽取的3,713份高质量基因组序列的共识中生成了我们的模型.因此,我们展示了目前分离的病毒的平均结构蛋白质组,包括特别关注药物结合位点的突变分析。在这里提出的结构蛋白质组中的持续动态突变监测对于及时预测进化病毒中可能的生理变化至关重要。
    OBJECTIVE: The 2022 outbreak of the monkeypox virus already involves, by April 2023, 110 countries with 86,956 confirmed cases and 119 deaths. Understanding an emerging disease on a molecular level is essential to study infection processes and eventually guide drug discovery at an early stage. To support this, we provide the so far most comprehensive structural proteome of the monkeypox virus, which includes 210 structural models, each computed with three state-of-the-art structure prediction methods. Instead of building on a single-genome sequence, we generated our models from a consensus of 3,713 high-quality genome sequences sampled from patients within 1 year of the outbreak. Therefore, we present an average structural proteome of the currently isolated viruses, including mutational analyses with a special focus on drug-binding sites. Continuing dynamic mutation monitoring within the structural proteome presented here is essential to timely predict possible physiological changes in the evolving virus.
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  • 文章类型: Journal Article
    The identification of RNA secondary structure has been an important tool for the characterization of nucleic acids. Computational structure prediction has been an effective approach toward this end, but improvement of established methods is often slow and reliant on redundant methodology. Here we present a novel consensus scoring approach, created to incorporate inputs from an array of established methods with the goal of producing outputs that contain mutual structures from these programs. This method is implemented in RNAdemocracy, a python program capable of competing with existing methods. This ensemble approach was limited by commonalities in established methods like parameter sourcing, which may lead to agreement error, an unavoidable outcome due to the limit of available RNA structure datasets. The modular construction of RNAdemocracy allows for its easy upgrading and customization to suit user\'s needs. RNAdemocracy, while capable of accurate predictions, is best suited to guide users to regions of the sequence space that exhibit agreement instead of a totally reliant predictor of structure. It is also capable of grading predictions for potential accuracy by providing a percentage of consensus between contributing methods in the final structure.
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