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https://www.readbyqxmd.com/read/28079879/the-cluspro-web-server-for-protein-protein-docking
#1
Dima Kozakov, David R Hall, Bing Xia, Kathryn A Porter, Dzmitry Padhorny, Christine Yueh, Dmitri Beglov, Sandor Vajda
The ClusPro server (https://cluspro.org) is a widely used tool for protein-protein docking. The server provides a simple home page for basic use, requiring only two files in Protein Data Bank (PDB) format. However, ClusPro also offers a number of advanced options to modify the search; these include the removal of unstructured protein regions, application of attraction or repulsion, accounting for pairwise distance restraints, construction of homo-multimers, consideration of small-angle X-ray scattering (SAXS) data, and location of heparin-binding sites...
February 2017: Nature Protocols
https://www.readbyqxmd.com/read/28078551/the-proteolysis-adaptor-nbla-binds-to-the-n-terminus-of-%C3%AE-phycocyanin-implications-for-the-mechanism-of-phycobilisome-degradation
#2
Amelia Y Nguyen, William P Bricker, Hao Zhang, Daniel A Weisz, Michael L Gross, Himadri B Pakrasi
Phycobilisome (PBS) complexes are massive light-harvesting apparati in cyanobacteria that capture and funnel light energy to the photosystem. PBS complexes are dynamically degraded during nutrient deprivation, which causes severe chlorosis, and resynthesized during nutrient repletion. PBS degradation occurs rapidly after nutrient step down, and is specifically triggered by non-bleaching protein A (NblA), a small proteolysis adaptor that facilitates interactions between a Clp chaperone and phycobiliproteins...
January 11, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28067274/computational-and-biochemical-characterization-of-two-partially-overlapping-interfaces-and-multiple-weak-affinity-k-ras-dimers
#3
Priyanka Prakash, Abdallah Sayyed-Ahmad, Kwang-Jin Cho, Drew M Dolino, Wei Chen, Hongyang Li, Barry J Grant, John F Hancock, Alemayehu A Gorfe
Recent studies found that membrane-bound K-Ras dimers are important for biological function. However, the structure and thermodynamic stability of these complexes remained unknown because they are hard to probe by conventional approaches. Combining data from a wide range of computational and experimental approaches, here we describe the structure, dynamics, energetics and mechanism of assembly of multiple K-Ras dimers. Utilizing a range of techniques for the detection of reactive surfaces, protein-protein docking and molecular simulations, we found that two largely polar and partially overlapping surfaces underlie the formation of multiple K-Ras dimers...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28063347/disruption-of-redox-catalytic-functions-of-peroxiredoxin-thioredoxin-complex-in-mycobacterium-tuberculosis-h37rv-using-small-interface-binding-molecules
#4
Arun Bahadur Gurung, Amit Kumar Das, Atanu Bhattacharjee
Mycobacterium tuberculosis has distinctive ability to detoxify various microbicidal superoxides and hydroperoxides via a redox catalytic cycle involving thiol reductants of peroxiredoxin (Prx) and thioredoxin (Trx) systems which has conferred on it resistance against oxidative killing and survivability within host. We have used computational approach to disrupt catalytic functions of Prx-Trx complex which can possibly render the pathogen vulnerable to oxidative killing in the host. Using protein-protein docking method, we have successfully constructed the Prx-Trx complex...
December 31, 2016: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28026062/addressing-recent-docking-challenges-a-hybrid-strategy-to-integrate-template-based-and-free-protein-protein-docking
#5
Yumeng Yan, Zeyu Wen, Xinxiang Wang, Sheng-You Huang
Protein-protein docking is an important computational tool for predicting protein-protein interactions. With the rapid development of proteomics projects, more and more experimental binding information ranging from mutagenesis data to three-dimensional structures of protein complexes are becoming available. Therefore, how to appropriately incorporate the biological information into traditional ab initio docking has been an important issue and challenge in the field of protein-protein docking. To address these challenges, we have developed a Hybrid DOCKing protocol of template-based and template-free approaches, referred to as HDOCK...
December 27, 2016: Proteins
https://www.readbyqxmd.com/read/28002624/flexpepdock-lessons-from-capri-peptide-protein-rounds-and-suggested-new-criteria-for-assessment-of-model-quality-and-utility
#6
Orly Marcu, Emma-Joy Dodson, Nawsad Alam, Michal Sperber, Dima Kozakov, Marc F Lensink, Ora Schueler-Furman
CAPRI rounds 28 and 29 included, for the first time, peptide-receptor targets of three different systems, reflecting increased appreciation of the importance of peptide-protein interactions. The CAPRI rounds allowed us to objectively assess the performance of Rosetta FlexPepDock, one of the first protocols to explicitly include peptide flexibility in docking, accounting for peptide conformational changes upon binding. We discuss here successes and challenges in modeling these targets: we obtain top-performing, high-resolution models of the peptide motif for cases with known binding sites but there is a need for better modeling of flanking regions, as well as better selection criteria, in particular for unknown binding sites...
December 21, 2016: Proteins
https://www.readbyqxmd.com/read/27936493/new-additions-to-the-cluspro-server-motivated-by-capri
#7
Sandor Vajda, Christine Yueh, Dmitri Beglov, Tanggis Bohnuud, Scott E Mottarella, Bing Xia, David R Hall, Dima Kozakov
The heavily used protein-protein docking server ClusPro performs three computational steps as follows: (1) rigid body docking, (2) RMSD based clustering of the 1000 lowest energy structures, and (3) the removal of steric clashes by energy minimization. In response to challenges encountered in recent CAPRI targets, we added three new options to ClusPro. These are (1) accounting for Small Angle X-ray Scattering (SAXS) data in docking; (2) considering pairwise interaction data as restraints; and (3) enabling discrimination between biological and crystallographic dimers...
December 9, 2016: Proteins
https://www.readbyqxmd.com/read/27914057/bindml-bindml-detecting-protein-protein-interaction-interface-propensity-from-amino-acid-substitution-patterns
#8
Qing Wei, David La, Daisuke Kihara
Prediction of protein-protein interaction sites in a protein structure provides important information for elucidating the mechanism of protein function and can also be useful in guiding a modeling or design procedures of protein complex structures. Since prediction methods essentially assess the propensity of amino acids that are likely to be part of a protein docking interface, they can help in designing protein-protein interactions. Here, we introduce BindML and BindML+ protein-protein interaction sites prediction methods...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27866112/protein-protein-interactions-scoring-schemes-and-binding-affinity
#9
REVIEW
M Michael Gromiha, K Yugandhar, Sherlyn Jemimah
Protein-protein interactions mediate several cellular functions, which can be understood from the information obtained using the three-dimensional structures of protein-protein complexes and binding affinity data. This review focuses on computational aspects of predicting the best native-like complex structure and binding affinities. The first part covers the prediction of protein-protein complex structures and the advantages of conformational searching and scoring functions in protein-protein docking. The second part is devoted to various aspects of protein-protein interaction thermodynamics, such as databases for binding affinities and other thermodynamic parameters, computational methods to predict the binding affinity using either the three-dimensional structures of complexes or amino acid sequences, and change in binding affinities of the complexes upon mutations...
November 17, 2016: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/27864097/post-translational-regulation-by-structural-changes-of-4-dihydromethyltrisporate-dehydrogenase-a-key-enzyme-in-sexual-and-parasitic-communication-mediated-by-the-trisporic-acid-pheromone-system-of-the-fungal-fusion-parasite-parasitella-parasitica
#10
Sabrina Ellenberger, Anke Burmester, Stefan Schuster, Johannes Wöstemeyer
Sexual communication between complementary mating partners in the fungal group of zygomycetes is mediated by the trisporoid pheromone system. A key enzyme towards biosynthesis of hormonally active trisporoids is 4-dihydromethyltrisporate dehydrogenase (TSP1), an enzyme occurring in all zygomycetous fungi. Trisporic acid and some of its precursor molecules serve as pheromones for recognizing complementary mating partners and for induction of the differentiation program towards sexual spore formation. In the parasitic zygomycete Parasitella parasitica, a biotrophic fusion parasite infecting many other zygomycetes, these substances have an additional function: They are also responsible for host-parasite recognition and the formation of the characteristic infection structures...
January 21, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/27862345/predicting-protein-conformational-changes-for-unbound-and-homology-docking-learning-from-intrinsic-and-induced-flexibility
#11
Haoran Chen, Yuanfei Sun, Yang Shen
Predicting protein conformational changes from unbound structures or even homology models to bound structures remains a critical challenge for protein docking. Here we present a study directly addressing the challenge by reducing the dimensionality and narrowing the range of the corresponding conformational space. The study builds on cNMA-our new framework of partner- and contact-specific normal mode analysis that exploits encounter complexes and considers both intrinsic and induced flexibility. First, we established over a CAPRI (Critical Assessment of PRedicted Interactions) target set that the direction of conformational changes from unbound structures and homology models can be reproduced to a great extent by a small set of cNMA modes...
November 15, 2016: Proteins
https://www.readbyqxmd.com/read/27862307/rescore-protein-protein-docked-ensembles-with-an-interface-contact-statistics
#12
Mihaly Mezei
The recently developed statistical measure for the type of residue-residue contact at protein complex interfaces, based on a parameter-free definition of contact, has been used to define a contact score that is correlated with the likelihood of correctness of a proposed complex structure. Comparing the proposed contact scores on the native structure and on a set of model structures the proposed measure was shown to generally favor the native structure but in itself was not able to reliably score the native structure to be the best...
November 12, 2016: Proteins
https://www.readbyqxmd.com/read/27846259/introducing-a-clustering-step-in-a-consensus-approach-for-the-scoring-of-protein-protein-docking-models
#13
Edrisse Chermak, Renato De Donato, Marc F Lensink, Andrea Petta, Luigi Serra, Vittorio Scarano, Luigi Cavallo, Romina Oliva
Correctly scoring protein-protein docking models to single out native-like ones is an open challenge. It is also an object of assessment in CAPRI (Critical Assessment of PRedicted Interactions), the community-wide blind docking experiment. We introduced in the field the first pure consensus method, CONSRANK, which ranks models based on their ability to match the most conserved contacts in the ensemble they belong to. In CAPRI, scorers are asked to evaluate a set of available models and select the top ten ones, based on their own scoring approach...
2016: PloS One
https://www.readbyqxmd.com/read/27845406/quantifying-side-chain-conformational-variations-in-protein-structure
#14
Zhichao Miao, Yang Cao
Protein side-chain conformation is closely related to their biological functions. The side-chain prediction is a key step in protein design, protein docking and structure optimization. However, side-chain polymorphism comprehensively exists in protein as various types and has been long overlooked by side-chain prediction. But such conformational variations have not been quantitatively studied and the correlations between these variations and residue features are vague. Here, we performed statistical analyses on large scale data sets and found that the side-chain conformational flexibility is closely related to the exposure to solvent, degree of freedom and hydrophilicity...
November 15, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27834872/unraveling-the-roots-of-selectivity-of-peptide-affinity-reagents-for-structurally-similar-ribosomal-inactivating-protein-derivatives
#15
Deborah A Sarkes, Margaret M Hurley, Dimitra N Stratis-Cullum
Peptide capture agents have become increasingly useful tools for a variety of sensing applications due to their ease of discovery, stability, and robustness. Despite the ability to rapidly discover candidates through biopanning bacterial display libraries and easily mature them to Protein Catalyzed Capture (PCC) agents with even higher affinity and selectivity, an ongoing challenge and critical selection criteria is that the peptide candidates and final reagent be selective enough to replace antibodies, the gold-standard across immunoassay platforms...
November 9, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27834201/identification-of-ybey-protein-interactions-involved-in-16s-rrna-maturation-and-stress-regulation-in-escherichia-coli
#16
Maarten Vercruysse, Caroline Köhrer, Yang Shen, Sandra Proulx, Anubrata Ghosal, Bryan W Davies, Uttam L RajBhandary, Graham C Walker
: YbeY is part of a core set of RNases in Escherichia coli and other bacteria. This highly conserved endoribonuclease has been implicated in several important processes such as 16S rRNA 3' end maturation, 70S ribosome quality control, and regulation of mRNAs and small noncoding RNAs, thereby affecting cellular viability, stress tolerance, and pathogenic and symbiotic behavior of bacteria. Thus, YbeY likely interacts with numerous protein or RNA partners that are involved in various aspects of cellular physiology...
November 8, 2016: MBio
https://www.readbyqxmd.com/read/27816523/structural-and-energy-determinants-in-protein-rna-docking
#17
Laura Pérez-Cano, Miguel Romero-Durana, Juan Fernández-Recio
Deciphering the structural and energetic determinants of protein-RNA interactions harbors the potential to understand key cell processes at molecular level, such as gene expression and regulation. With this purpose, computational methods like docking aim to complement current biophysical and structural biology efforts. However, the few reported docking algorithms for protein-RNA interactions show limited predictive success rates, mainly due to incomplete sampling of the conformational space of both the protein and the RNA molecules, as well as to the difficulties of the scoring function in identifying the correct docking models...
November 2, 2016: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/27802576/performance-of-mdockpp-in-capri-rounds-28-29-and-31-35-including-the-prediction-of-water-mediated-interactions
#18
Xianjin Xu, Liming Qiu, Chengfei Yan, Zhiwei Ma, Sam Z Grinter, Xiaoqin Zou
Protein-protein interactions are either through direct contacts between two binding partners or mediated by structural waters. Both direct contacts and water-mediated interactions are crucial to the formation of a protein-protein complex. During the recent CAPRI rounds, a novel parallel searching strategy for predicting water-mediated interactions is introduced into our protein-protein docking method, MDockPP. Briefly, a FFT-based docking algorithm is employed in generating putative binding modes, and an iteratively derived statistical potential-based scoring function, ITScorePP, in conjunction with biological information is used to assess and rank the binding modes...
November 1, 2016: Proteins
https://www.readbyqxmd.com/read/27799549/e3-ubiquitin-ligase-sp1-regulates-peroxisome-biogenesis-in-arabidopsis
#19
Ronghui Pan, John Satkovich, Jianping Hu
Peroxisomes are ubiquitous eukaryotic organelles that play pivotal roles in a suite of metabolic processes and often act coordinately with other organelles, such as chloroplasts and mitochondria. Peroxisomes import proteins to the peroxisome matrix by peroxins (PEX proteins), but how the function of the PEX proteins is regulated is poorly understood. In this study, we identified the Arabidopsis RING (really interesting new gene) type E3 ubiquitin ligase SP1 [suppressor of plastid protein import locus 1 (ppi1) 1] as a peroxisome membrane protein with a regulatory role in peroxisome protein import...
November 15, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27797779/jadoppt-java-based-autodock-preparing-and-processing-tool
#20
Carlos García-Pérez, Rafael Peláez, Roberto Therón, José Luis López-Pérez
MOTIVATION: AutoDock is a very popular software package for docking and virtual screening. However, currently it is hard work to visualize more than one result from the virtual screening at a time. To overcome this limitation we have designed JADOPPT, a tool for automatically preparing and processing multiple ligand-protein docked poses obtained from AutoDock. It allows the simultaneous visual assessment and comparison of multiple poses through clustering methods. Moreover, it permits the representation of reference ligands with known binding modes, binding site residues, highly scoring regions for the ligand, and the calculated binding energy of the best ranked results...
October 26, 2016: Bioinformatics
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