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Regulating the NLO response of anthraquinone-supported thiourea-linked crown ether macrocycle by introducing metal cations: A DFT study 引入金属阳离子调节蒽醌负载硫脲连接冠醚大环的非线性光学响应:DFT研究
IF 2.4 Q3 Computer Science Pub Date : 2020-07-04 DOI: 10.1142/s0219633620500170
Yao Yao, Jin-Ting Ye, Xiang Li, Y. Zhang, Sinan Zhu, Y. Qiu
Recently, an anthraquinone-supported thiourea group linking a 1-aza-18-crown-6 macrocycle L has been the subject of extensive attention due to the perfect affinity towards metal cations. This work ...
最近,连接1-氮杂-18-冠-6大环L的蒽醌负载的硫脲基团由于其对金属阳离子的完美亲和力而受到广泛关注。这项工作。。。
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引用次数: 2
Quantum chemical, experimental exploration of biological activity and inhibitory potential of new cytotoxic kochiosides fromKochia prostrata(L.) Schrad 鳖甲新细胞毒总苷的量子化学、生物活性及抑制潜力的实验研究Schrad
IF 2.4 Q3 Computer Science Pub Date : 2020-07-01 DOI: 10.1142/s0219633620500121
A. Irfan, Muhammad Imran, A. Al‐Sehemi, M. Assiri, A. Hussain, Noreen Khalid, S. Ullah, G. Abbas
New cytotoxic steroidal glycoside of methanol extract from Kochia prostrata (L.) Schrad was investigated in this study. Bio-guided isolation from ethylacetate fraction of whole plant afforded stero...
蜈蚣草甲醇提取物新细胞毒性甾体苷的研究Schrad在这项研究中被调查。全株乙酸乙酯部分的生物引导分离提供了立体成像技术。
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引用次数: 6
In-silico analysis to identify the role of MEN1 missense mutations in breast cancer 通过计算机分析确定MEN1错义突变在乳腺癌中的作用
IF 2.4 Q3 Computer Science Pub Date : 2020-06-30 DOI: 10.1142/s0219633620410023
S. R. Ganakammal, Mahesh Koirala, Bohua Wu, E. Alexov
Background: The multiple endocrine neoplasia type 1 (MEN1) gene located on chromosome 11q13 encodes menin protein. Previously reported mutations were thought to result in loss of function of menin ...
背景:位于染色体11q13上的多发性内分泌瘤1型(MEN1)基因编码menin蛋白。先前报道的突变被认为是导致menin功能丧失的原因。
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引用次数: 3
Theoretical study of new push–pull molecules based on transition metals for NLO applications and determination of ICT mechanisms by DFT calculations NLO应用中基于过渡金属的新型推挽分子的理论研究和用DFT计算确定ICT机制
IF 2.4 Q3 Computer Science Pub Date : 2020-06-23 DOI: 10.1142/s0219633620500261
A. M. Elhorri
This study is based on the valuation of a few model molecules. The objective of this research is focussed on the nonlinear optical (NLO) improvement of four organometallic molecules and one organic molecule. These molecules have been subjected to several calculations by different functionals: CAM–B3LYP, LC–BLYP, LC–wPBE, wB97X, M11, M06–2X, M08–HX and M08–SO. These functionals gave three orders of classification of the [Formula: see text] parameters. The CAM–B3LYP functional recorded very good agreement between [Formula: see text] parameters and gaps ([Formula: see text]. Significant first hyperpolarizabilities ([Formula: see text] have been obtained around 880 * 10[Formula: see text][Formula: see text]esu. The mechanisms of intramolecular charge transfer (ICT) have shown energetic passages from donor groups to acceptors and vice versa. The substitution of metals influences the location of [Formula: see text] electrons at the level of the chromophores. Finally, the lengthening of the aromatic chains between the acceptor and donor groups shows significant NLO improvements. The first and second hyperpolarizabilities ([Formula: see text] and ([Formula: see text] for a chain of several benzene rings are of the order of 21,663.16 * 10[Formula: see text][Formula: see text]esu and 16,464.65 * 10[Formula: see text][Formula: see text]esu, respectively.
这项研究是基于对一些模型分子的评估。本研究的目的是对四个有机金属分子和一个有机分子进行非线性光学(NLO)改进。这些分子已经通过不同的泛函进行了多次计算:CAM–B3LYP、LC–BLYP、LC–wPBE、wB97X、M11、M06–2X、M08–HX和M08–SO。这些泛函给出了[公式:见正文]参数的三个分类顺序。CAM–B3LYP功能记录了[公式:见正文]参数和间隙之间非常好的一致性([公式:见图正文])。在880*10[公式:参见正文][公式:见文本]esu左右获得了显著的第一超极化率([公式,见文本])。分子内电荷转移(ICT)的机制显示了从供体基团到受体的能量传递,反之亦然。金属的取代影响[公式:见正文]电子在发色团水平上的位置。最后,受体和供体基团之间的芳香链的延长显示出显著的NLO改善。几个苯环的链的第一和第二超极化率([式:见正文]和([式∶见正文])分别为21663.16*10[式:见正文][式:见文本]esu和16464.65*10[式∶见正文][式:见案文]esu的数量级。
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引用次数: 4
Thermal behavior of complex model with the cellulose II and amorphous chain 纤维素Ⅱ和无定形链复合模型的热行为
IF 2.4 Q3 Computer Science Pub Date : 2020-06-15 DOI: 10.1142/s0219633620400040
Yu Chen, Xuewei Jiang, Huhe Wu, Lu Zheng
to investigate the thermal behavior of complex model with amorphous region and crystallization region of cellulose ii, the structures and properties of cellulose ii, amorphous chain and their combined models were studied by molecular dynamics simulation . the results showed that the amorphous chain is more susceptible to temperature than the cellulose ii. it can form anti- parallel structure similar to cellulose ii at high temperature . in the complex model , one end of the amorphous chain is fixed to form hydrogen bonds with the cellulose ii, and the other end is not. at 300[formula: see text]k, the free part of amorphous chain is approximately perpendicular to the axial direction of the cellulose ii. when the temperature increases, the free part of amorphous chain adheres to the surface of cellulose ii. the free part of amorphous chain did not form hydrogen bond with the cellulose ii. the formation of amorphous chain and surface of the cellulose ii is a zipper process at 450[formula: see text]k. furthermore, water molecules penetrate into the inter-space of the amorphous and crystalline regions. the probability of hydrogen bonds between water molecules and the complex model was less than 8.21% which explains why cellulose is insoluble in water. these conclusions provide a guiding significance for the dissolution mechanism of cellulose.
为了研究具有非晶态区和结晶区的纤维素ii复合模型的热行为,采用分子动力学模拟方法研究了纤维素ii、非晶态链及其组合模型的结构和性质。结果表明,非晶链比纤维素更容易受到温度的影响。在高温下可形成类似纤维素ii的反平行结构。在复杂模型中,无定形链的一端固定与纤维素ii形成氢键,而另一端不固定。在300 k时,非晶链的自由部分近似垂直于纤维素的轴向。当温度升高时,非晶链的自由部分粘附在纤维素表面。无定形链的游离部分不与纤维素形成氢键。无定形链的形成和表面的纤维素ii是一个拉链过程在450[公式:见文]k。此外,水分子渗透到无定形和结晶区域的间隙。水分子与复合模型之间形成氢键的概率小于8.21%,这就解释了纤维素不溶于水的原因。这些结论对纤维素溶解机理的研究具有指导意义。
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引用次数: 4
Changes in structure and flexibility of p53 TAD2 upon binding to p300 Taz2 p53 TAD2与p300 Taz2结合后结构和灵活性的变化
IF 2.4 Q3 Computer Science Pub Date : 2020-06-15 DOI: 10.1142/s0219633620400076
Tongtong Li, Amy O. Stevens, Laura I. Gil Pineda, Shenghan Song, Christabel A. Ameyaw Baah, Yi He
p53 is a transcription factor with intrinsically disordered regions that plays an essential role in many cellular processes. As a tumor suppressor, the dysfunction of p53 causes various cancers. p5...
p53是一种具有内在紊乱区域的转录因子,在许多细胞过程中发挥重要作用。作为一种肿瘤抑制因子,p53的功能障碍会导致多种癌症。p5。。。
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引用次数: 4
The accuracy of force fields on the simulation of intrinsically disordered proteins: A benchmark test on the human p53 tumor suppressor 模拟内在无序蛋白的力场的准确性:对人类p53肿瘤抑制因子的基准测试
IF 2.4 Q3 Computer Science Pub Date : 2020-06-01 DOI: 10.1142/s021963362050011x
Shangbo Ning, Jun Liu, Na Liu, Da-zhong Yan
Intrinsically disordered proteins (IDPs) are a class of proteins without stable three-dimensional structures under physiological conditions. IDPs exhibit high dynamic nature and could be described by structural ensembles. As one of the most widely used tools, molecular dynamics (MD) simulation could provide the atomic descriptions of the structural ensemble of IDPs. However, the accuracy of the MD simulation largely depends on the accuracy of the force field. In this paper, we compared the structural ensembles of the activation domain 1 (AD1) in p53 tumor suppressor obtained from the widely used force fields, AMBER99SB-ILDN, CHARMM27, CHARMM36m with different water models. The results show that CHARMM36m generates more extended conformations than other force fields, while CHARMM27 prefers to sample the [Formula: see text]-helical structure. Moreover, the chemical shifts obtained by CHARMM36m are the closest to the experimental measurements. These results indicate that the CHARMM36m force field performs best in characterizing the structure properties of p53 AD1. Water models are also critical to describe the structural ensemble of IDPs. TIP4P water model can obtain more extended conformations and produce more local helical conformations than the TIP3P model in our simulation. In addition, we also compare the chemical shifts predicted by different chemical shift predicting programs with experimental measurements, the results show that SHIFTX2 obtains the best performance in the chemical shifts prediction.
内在无序蛋白(IDPs)是一类在生理条件下没有稳定三维结构的蛋白质。国内流离失所者表现出高动态性质,可以用结构系综来描述。分子动力学(MD)模拟是目前应用最广泛的工具之一,它可以对IDPs的结构系综进行原子描述。然而,MD仿真的精度在很大程度上取决于力场的精度。在本文中,我们比较了从广泛使用的力场amber99sdb - ildn、CHARMM27、CHARMM36m不同水模型中获得的p53肿瘤抑制因子激活域1 (activation domain 1, AD1)的结构集合。结果表明,CHARMM36m比其他力场产生更多的扩展构象,而CHARMM27更倾向于采样[公式:见文]-螺旋结构。此外,CHARMM36m获得的化学位移与实验测量最接近。这些结果表明,CHARMM36m力场最能表征p53 AD1的结构特性。水模型对于描述国内流离失所者的结构集合也至关重要。在我们的模拟中,与TIP3P模型相比,TIP4P水模型可以获得更多的扩展构象和产生更多的局部螺旋构象。此外,我们还将不同化学位移预测程序预测的化学位移与实验测量结果进行了比较,结果表明SHIFTX2在化学位移预测中获得了最好的性能。
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引用次数: 2
Xanthine oxidoreductase inhibition – A review of computational aspect 黄嘌呤氧化还原酶抑制——计算方面的综述
IF 2.4 Q3 Computer Science Pub Date : 2020-06-01 DOI: 10.1142/s0219633620400088
Chaonan Dong, M. Montes, W. Al-Sawai
Xanthine Oxidoreductase (XOR) exists in a variety of organisms from bacteria to humans and catalyzes the oxidation of hypoxanthine to xanthine and from xanthine to uric acid. Excessive uric acid could lead to gout and hyperuricemia. In this paper, we have reviewed the recent computational studies on xanthine oxidase inhibition. Computational methods, such as molecular dynamics (molecular mechanics), quantum mechanics, and quantum mechanics/molecular mechanics (QM/MM), have been employed to investigate the binding affinity of xanthine oxidase with synthesized and isolated nature inhibitors. The limitations of different computational methods for xanthine oxidase inhibition studies were also discussed. Implications of the computational approach could be used to help to understand the existing arguments on substrate/product orientation in xanthine oxidase inhibition, which allows designing new inhibitors with higher efficacy.
黄嘌呤氧化还原酶(XOR)存在于从细菌到人类的各种生物体中,催化次黄嘌呤氧化为黄嘌呤和黄嘌呤氧化成尿酸。尿酸过高会导致痛风和高尿酸血症。本文综述了近年来黄嘌呤氧化酶抑制的计算研究进展。已经采用分子动力学(分子力学)、量子力学和量子力学/分子力学(QM/MM)等计算方法来研究黄嘌呤氧化酶与合成和分离的天然抑制剂的结合亲和力。还讨论了黄嘌呤氧化酶抑制研究中不同计算方法的局限性。计算方法的含义可用于帮助理解黄嘌呤氧化酶抑制中底物/产物取向的现有论点,这允许设计具有更高功效的新抑制剂。
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引用次数: 4
A new way to recognize downhill folding based on generalized path length 基于广义路径长度的下坡折叠识别新方法
IF 2.4 Q3 Computer Science Pub Date : 2020-06-01 DOI: 10.1142/s0219633620400052
Xuewei Jiang, Zhengwu Wu, Z. Fan, Junhua Yin, Lu Zheng
The protein folding is an important scientific problem and many methods were designed to elucidate the protein folding and obtain insight into the molecular mechanism. A novel means is presented to identify the downhill pathways of protein folding in this paper. This method is based on barrier energy profile projected onto the generalized path length (GPL) with Breadth-first searching (BFS) algorithm. We show the effectiveness of this approach by constructing the barrier energy profile of trpzip2 and comparing with other methods.
蛋白质折叠是一个重要的科学问题,人们设计了许多方法来阐明蛋白质折叠并深入了解其分子机制。本文提出了一种新的方法来识别蛋白质折叠的下行途径。该方法基于广义路径长度(GPL)上的势垒能量分布,采用广度优先搜索(BFS)算法。我们通过构建trpzip2的势垒能量分布并与其他方法进行比较,证明了该方法的有效性。
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引用次数: 1
Adaptive lasso with weights based on normalized filtering scores in molecular big data 分子大数据中基于归一化滤波分数的权重自适应套索
IF 2.4 Q3 Computer Science Pub Date : 2020-06-01 DOI: 10.1142/s0219633620400106
Abhijeet R. Patil, Byung-Kwon Park, Sangjin Kim
The molecular big data are highly correlated, and numerous genes are not related. The various classification methods performance mainly rely on the selection of significant genes. Sparse regularized regression (SRR) models using the least absolute shrinkage and selection operator (lasso) and adaptive lasso (alasso) are popularly used for gene selection and classification. Nevertheless, it becomes challenging when the genes are highly correlated. Here, we propose a modified adaptive lasso with weights using the ranking-based feature selection (RFS) methods capable of dealing with the highly correlated gene expression data. Firstly, an RFS methods such as Fisher’s score (FS), Chi-square (CS), and information gain (IG) are employed to ignore the unimportant genes and the top significant genes are chosen through sure independence screening (SIS) criteria. The scores of the ranked genes are normalized and assigned as proposed weights to the alasso method to obtain the most significant genes that were proven to be biologically related to the cancer type and helped in attaining higher classification performance. With the synthetic data and real application of microarray data, we demonstrated that the proposed alasso method with RFS methods is a better approach than the other known methods such as alasso with filtering such as ridge and marginal maximum likelihood estimation (MMLE), lasso and alasso without filtering. The metrics of accuracy, area under the receiver operating characteristics curve (AUROC), and geometric mean (GM-mean) are used for evaluating the performance of the models.
分子大数据高度相关,大量基因不相关。各种分类方法的表现主要依赖于对显著基因的选择。利用最小绝对收缩和选择算子(lasso)和自适应lasso (alasso)的稀疏正则化回归(SRR)模型被广泛用于基因选择和分类。然而,当基因高度相关时,它就变得具有挑战性了。在此,我们提出了一种改进的自适应加权套索,该套索使用基于排名的特征选择(RFS)方法来处理高度相关的基因表达数据。首先,采用Fisher评分(FS)、卡方(CS)和信息增益(IG)等RFS方法忽略不重要基因,并通过确定的独立性筛选(SIS)标准选择最重要的基因。排序基因的分数被归一化,并作为建议的权重分配给alasso方法,以获得最重要的基因,这些基因被证明与癌症类型具有生物学相关性,并有助于获得更高的分类性能。通过合成数据和微阵列数据的实际应用,我们证明了基于RFS方法的alasso方法优于其他已知的带岭和边际极大似然估计(MMLE)等滤波的alasso方法,以及lasso和不带滤波的alasso方法。准确度、受试者工作特征曲线下面积(AUROC)和几何均值(GM-mean)等指标用于评估模型的性能。
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引用次数: 2
期刊
Journal of Theoretical & Computational Chemistry
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