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linker p450

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https://www.readbyqxmd.com/read/28405004/engineered-p450-biocatalysts-show-improved-activity-and-regio-promiscuity-in-aromatic-nitration
#1
Ran Zuo, Yi Zhang, Chao Jiang, John C Hackett, Rosemary Loria, Steven D Bruner, Yousong Ding
Nitroaromatics are among the most important and commonly used chemicals but their production often suffers from multiple unsolved challenges. We have previously described the development of biocatalytic nitration processes driven by an engineered P450 TxtE fusion construct. Herein we report the creation of improved nitration biocatalysts through constructing and characterizing fusion proteins of TxtE with the reductase domain of CYP102A1 (P450BM3, BM3R). The majority of constructs contained variable linker length while one was rationally designed for optimizing protein-protein interactions...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28377716/human-cytochrome-p450-3a4-as-a-biocatalyst-effects-of-the-engineered-linker-in-modulation-of-coupling-efficiency-in-3a4-bmr-chimeras
#2
Danilo Degregorio, Serena D'Avino, Silvia Castrignanò, Giovanna Di Nardo, Sheila J Sadeghi, Gianluca Catucci, Gianfranco Gilardi
Human liver cytochrome P450 3A4 is the main enzyme involved in drug metabolism. This makes it an attractive target for biocatalytic applications, such as the synthesis of pharmaceuticals and drug metabolites. However, its poor solubility, stability and low coupling have limited its application in the biotechnological context. We previously demonstrated that the solubility of P450 3A4 can be increased by creating fusion proteins between the reductase from Bacillus megaterium BM3 (BMR) and the N-terminally modified P450 3A4 (3A4-BMR)...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28355486/molecular-recognition-in-mitochondrial-cytochromes-p450-that-catalyze-the-terminal-steps-of-corticosteroid-biosynthesis
#3
Hwei-Ming Peng, Richard J Auchus
The mitochondrial cytochromes P450 11B1 and P450 11B2 are responsible for the final stages of cortisol and aldosterone synthesis, respectively. Dysregulation of both enzymes has been implicated in secondary forms of hypertension. Molecular recognition of the cytochromes P450 with their corresponding redox partner is a key step in the catalytic cycle, yet the precise nature of the interaction of P450 11B1 or P450 11B2 with their proximal partner, adrenodoxin (Adx), is still unknown. Here, we obtained P450 11B1·Adx2 and P450 11B2·Adx2 complexes using the zero-length cross-linker ethyl-3-[3-(dimethylamino)propyl]carbodiimide, which formed best under low-ionic strength conditions...
April 17, 2017: Biochemistry
https://www.readbyqxmd.com/read/28300390/recruitment-and-regulation-of-the-non-ribosomal-peptide-synthetase-modifying-cytochrome-p450-involved-in-nikkomycin-biosynthesis
#4
Courtney E Wise, Thomas M Makris
The β-hydroxylation of l-histidine is the first step in the biosynthesis of the imidazolone base of the antifungal drug nikkomycin. The cytochrome P450 (NikQ) hydroxylates the amino acid while it is appended via a phosphopantetheine linker to the non-ribosomal peptide synthetase (NRPS) NikP1. The latter enzyme is comprised of an MbtH and single adenylation and thiolation domains, a minimal composition that allows for detailed binding and kinetics studies using an intact and homogeneous NRPS substrate. Electron paramagnetic resonance studies confirm that a stable complex is formed with NikQ and NikP1 when the amino acid is tethered...
March 28, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28204885/de-bugging-and-maximizing-plant-cytochrome-p450-production-in-escherichia-coli-with-c-terminal-gfp-fusions
#5
Ulla Christensen, Dario Vazquez-Albacete, Karina M Søgaard, Tonja Hobel, Morten T Nielsen, Scott James Harrison, Anders Holmgaard Hansen, Birger Lindberg Møller, Susanna Seppälä, Morten H H Nørholm
Cytochromes P450 (CYP) are attractive enzyme targets in biotechnology as they catalyze stereospecific C-hydroxylations of complex core skeletons at positions that typically are difficult to access by chemical synthesis. Membrane bound CYPs are involved in nearly all plant pathways leading to the formation of high-value compounds. In the present study, we systematically maximize the heterologous expression of six different plant-derived CYP genes in Escherichia coli, using a workflow based on C-terminal fusions to the green fluorescent protein...
February 15, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28131847/inhibition-of-11%C3%AE-hydroxysteroid-dehydrogenase-2-by-the-fungicides-itraconazole-and-posaconazole
#6
Katharina R Beck, Murielle Bächler, Anna Vuorinen, Sandra Wagner, Muhammad Akram, Ulrich Griesser, Veronika Temml, Petra Klusonova, Hideaki Yamaguchi, Daniela Schuster, Alex Odermatt
Impaired 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2)-dependent cortisol inactivation can lead to electrolyte dysbalance, hypertension and cardiometabolic disease. Furthermore, placental 11β-HSD2 essentially protects the fetus from high maternal glucocorticoid levels, and its impaired function has been associated with altered fetal growth and a higher risk for cardio-metabolic diseases in later life. Despite its important role, 11β-HSD2 is not included in current off-target screening approaches. To identify potential 11β-HSD inhibitors among approved drugs, a pharmacophore model was used for virtual screening, followed by biological assessment of selected hits...
January 25, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28054175/directed-accumulation-of-less-toxic-pimaricin-derivatives-by-improving-the-efficiency-of-a-polyketide-synthase-dehydratase-domain
#7
Zhen Qi, Yucong Zhou, Qianjin Kang, Chunyan Jiang, Jianting Zheng, Linquan Bai
Pimaricin is an important polyene antifungal antibiotic that binds ergosterol and extracts it from fungal membranes. In previous work, two pimaricin derivatives (1 and 2) with improved pharmacological activities and another derivative (3) that showed no antifungal activity were produced by the mutant strain of Streptomyces chattanoogensis, in which the P450 monooxygenase gene scnG has been inactivated. Furthermore, inactivation of the DH12 dehydratase domain of the pimaricin polyketide synthases (PKSs) resulted in specific accumulation of the undesired metabolite 3, suggesting that improvement of the corresponding dehydratase activity may reduce or eliminate the accumulation of 3...
March 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27814979/improving-the-activity-of-surface-displayed-cytochrome-p450-enzymes-by-optimizing-the-outer-membrane-linker
#8
Paul Quehl, Jan Schüürmann, Joel Hollender, Joachim Jose
Anchorage of recombinant proteins onto the outer membrane of gram-negative bacteria is an attractive solution for protein library screening and whole cell biocatalysis if a membrane environment is required or mass transfer into the cell is limiting. Autotransporters have been successfully applied for surface display of various heterologous proteins. Still, many underlying parameters for achieving active enzymes are not known. Here, we systematically tested different linkers between passenger and the membrane embedded β-barrel of the autotransporter...
January 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27781345/immobilization-of-a-bacterial-cytochrome-p450-monooxygenase-system-on-a-solid-support
#9
Cheau Yuaan Tan, Hidehiko Hirakawa, Risa Suzuki, Tomoaki Haga, Fumiya Iwata, Teruyuki Nagamune
Bacterial cytochrome P450s (P450s), which catalyze regio- and stereoselective oxidations of hydrocarbons with high turnover rates, are attractive biocatalysts for fine chemical production. Enzyme immobilization is needed for cost-effective industrial manufacturing. However, immobilization of P450s is difficult because electron-transfer proteins are involved in catalysis and anchoring these can prevent them from functioning as shuttle molecules for carrying electrons. We studied a heterotrimeric protein-mediated co-immobilization of a bacterial P450, and its electron-transfer protein and reductase...
October 26, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27240349/transcriptome-and-difference-analysis-of-fenpropathrin-resistant-predatory-mite-neoseiulus-barkeri-hughes
#10
Lin Cong, Fei Chen, Shijiang Yu, Lili Ding, Juan Yang, Ren Luo, Huixia Tian, Hongjun Li, Haoqiang Liu, Chun Ran
Several fenpropathrin-resistant predatory mites have been reported. However, the molecular mechanism of the resistance remains unknown. In the present study, the Neoseiulus barkeri (N. barkeri) transcriptome was generated using the Illumina sequencing platform, 34,211 unigenes were obtained, and 15,987 were manually annotated. After manual annotation, attentions were attracted to resistance-related genes, such as voltage-gated sodium channel (VGSC), cytochrome P450s (P450s), and glutathione S-transferases (GSTs)...
May 27, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27050842/potent-and-selective-human-neuronal-nitric-oxide-synthase-inhibition-by-optimization-of-the-2-aminopyridine-based-scaffold-with-a-pyridine-linker
#11
Heng-Yen Wang, Yajuan Qin, Huiying Li, Linda J Roman, Pavel Martásek, Thomas L Poulos, Richard B Silverman
Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (Ki = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a Ki value of 13 nM against human nNOS with 1761-fold human n/e selectivity...
May 26, 2016: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27049848/a-fluorescent-readout-for-the-oxidation-state-of-electron-transporting-proteins-in-cell-free-settings
#12
Sergii Pochekailov, Rebecca R Black, Venkata Pramod Chavali, Arjun Khakhar, Georg Seelig
Pathways involving sequential electron transfer between multiple proteins are ubiquitous in nature. Here, we demonstrate a new class of fluorescent protein-based reporters for monitoring electron transport through such multistage cascades, specifically those involving ferredoxin-like electron transporters. We created protein fusions between mammalian Adrenodoxin (Adx) and plant Ferredoxin (Fdx) with fluorescent proteins of different colors and found that the fluorescence of such fusions is highly sensitive to the redox state of the electron transporter...
July 15, 2016: ACS Synthetic Biology
https://www.readbyqxmd.com/read/26972311/a-rationally-designed-connector-for-assembly-of-protein-functionalized-dna-nanostructures
#13
Katja J Koßmann, Cornelia Ziegler, Alessandro Angelin, Rebecca Meyer, Marc Skoupi, Kersten S Rabe, Christof M Niemeyer
We report on the rational engineering of the binding interface of the self-ligating HaloTag protein to generate an optimized linker for DNA nanostructures. Five amino acids positioned around the active-site entry channel for the chlorohexyl ligand (CH) of the HaloTag protein were exchanged for positively charged lysine amino acids to produce the HOB (halo-based oligonucleotide binder) protein. HOB was genetically fused with the enzyme cytochrome P450 BM3, as well as with BMR, the separated reductase domain of BM3...
June 16, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/26235815/photo-initiated-crosslinking-extends-mapping-of-the-protein-protein-interface-to-membrane-embedded-portions-of-cytochromes-p450-2b4-and-b%C3%A2
#14
Tomáš Ječmen, Renata Ptáčková, Věra Černá, Helena Dračínská, Petr Hodek, Marie Stiborová, Jiří Hudeček, Miroslav Šulc
Protein-protein interactions play a central role in the regulation of many biochemical processes (e.g. the system participating in enzyme catalysis). Therefore, a deeper understanding of protein-protein interactions may contribute to the elucidation of many biologically important mechanisms. For this purpose, it is necessary to establish the composition and stoichiometry of supramolecular complexes and to identify the crucial portions of the interacting molecules. This study is devoted to structure-functional relationships in the microsomal Mixed Function Oxidase (MFO) complex, which is responsible for biotransformation of many hydrophobic endogenous compounds and xenobiotics...
November 1, 2015: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/26177696/design-and-improvement-of-artificial-redox-modules-by-molecular-fusion-of-flavodoxin-and-flavodoxin-reductase-from-escherichia-coli
#15
Patrick J Bakkes, Stefan Biemann, Ansgar Bokel, Marc Eickholt, Marco Girhard, Vlada B Urlacher
A variety of fusion proteins between the versatile redox partners flavodoxin (FldA) and flavodoxin reductase (Fpr) from Escherichia coli was constructed with the aim to improve the electron transfer properties. The order in which FldA and Fpr were fused and the linker region between them was varied in a systematic manner. A simple molecular tool, designated "DuaLinX", was developed that facilitated the parallel introduction of flexible glycine-rich and rigid proline-rich linkers between the fusion partners in a single cloning event...
2015: Scientific Reports
https://www.readbyqxmd.com/read/25638375/quantification-of-interactions-between-cytochrome-p450-2b4-and-cytochrome-b5-in-a-functional-membrane-complex
#16
Tomáš Ječmen, Renata Ptáčková, Daniel Kavan, Věra Cerná, Petr Hodek, Marie Stiborová, Jiří Hudeček, Miroslav Sulc
OBJECTIVES: The mammalian mixed function oxidase (MFO) system participates in hydroxylation of many hydrophobic endogenous compounds as well as xenobiotics such as drugs and carcinogens. This biotransformation system, located in a membrane of endoplasmic reticulum, consists of cytochrome P-450 (P450), NADPH:P450 oxidoreductase and a facultative component, cytochrome b5. The knowledge of the interactions among the individual components of the MFO system is essential to understand the relationships between the structure and function of this system that finally dictate a qualitative and quantitative pattern of produced metabolites (e...
2014: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/25079257/aflatoxin-and-deconstruction-of-type-i-iterative-polyketide-synthase-function
#17
REVIEW
Craig A Townsend
In this viewpoint highlights are drawn from a deep analysis of the multifaceted problem of aflatoxin biosynthesis, one of the most highly rearranged polyketide natural products known. Fundamental chemical insights have emerged into how cytochrome P450-mediated skeletal rearrangements occur through probable cationic intermediates and oxidative dearomatizations, which are applicable more widely in natural product catabolism. So to where current experimental methods have failed in our hands, bioinformatic tools and fresh experimental strategies have been developed to identify linker regions in large, polydomain proteins and guide the dissection and reassembly of their component parts...
October 2014: Natural Product Reports
https://www.readbyqxmd.com/read/25005689/p-link-a-method-for-generating-multicomponent-cytochrome-p450-fusions-with-variable-linker-length
#18
Ketaki D Belsare, Anna Joëlle Ruff, Ronny Martinez, Amol V Shivange, Hemanshu Mundhada, Dirk Holtmann, Jens Schrader, Ulrich Schwaneberg
Fusion protein construction is a widely employed biochemical technique, especially when it comes to multi-component enzymes such as cytochrome P450s. Here we describe a novel method for generating fusion proteins with variable linker lengths, protein fusion with variable linker insertion (P-LinK), which was validated by fusing P450cin monooxygenase (CinA) to the flavodoxin shuttle protein (CinC). CinC was fused to the C terminus of CinA through a series of 16 amino acid linkers of different lengths in a single experiment employing 3 PCR amplifications...
July 2014: BioTechniques
https://www.readbyqxmd.com/read/24292786/synthesis-and-structure-activity-relationship-of-naphtho-1-2-b-furan-2-carboxamide-derivatives-as-melanin-concentrating-hormone-receptor-1-antagonists
#19
Chae Jo Lim, Jun Young Choi, Byung Ho Lee, Kwang-Seok Oh, Kyu Yang Yi
The discovery that novel naphtho[1,2-b]furan-2-carboxamides containing linked piperidinylphenylacetamide groups serve as melanin concentrating hormone receptor 1 (MCH-R1) antagonists is described. An extensive structure-activity relationship (SAR) study, probing members of this family that contain a variety of aryl and heteroaryl groups at C-5 of the naphtho[1,2-b]furan-2-carboxamide skeleton and having different chain linker lengths, led to the identification of the 5-(4-pyridinyl) substituted analog 10b as a highly potent MCH-R1 antagonist with an IC50 value of 3 nM...
2013: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/24040392/fine-tuning-of-spatial-arrangement-of-enzymes-in-a-pcna-mediated-multienzyme-complex-using-a-rigid-poly-l-proline-linker
#20
Tomoaki Haga, Hidehiko Hirakawa, Teruyuki Nagamune
Inspired by natural multienzyme complexes, many types of artificial multienzyme complexes have recently been constructed. We previously constructed a self-assembled complex of a bacterial cytochrome P450 and its ferredoxin and ferredoxin reductase partners using heterotrimerization of proliferating cell nuclear antigen (PCNA) from Sulfolobus solfataricus. In this study, we inserted different peptide linkers between ferredoxin and the PCNA subunit, and examined the effect on activity of the self-assembled multienzyme complex...
2013: PloS One
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