排序方式: 共有273条查询结果,搜索用时 15 毫秒
91.
Aleksandar Mikić Petr Smýkal Gregory Kenicer Margarita Vishnyakova Nune Sarukhanyan Janna A. Akopian Armen Vanyan Ivan Gabrielyan Iva Smýkalová Ekaterina Sherbakova Lana Zorić Jovanka Atlagić Tijana Zeremski-Škorić Branko Ćupina Đorđe Krstić Igor Jajić Svetlana Antanasović Vuk Đorđević Vojislav Mihailović Alexandr Ivanov Sergio Ochatt Cengiz Toker Bojan Zlatković Mike Ambrose 《Planta》2014,240(5):1147-1147
92.
Rachael Parker Ana Mercedes‐Camacho Tijana Z. Grove 《Protein science : a publication of the Protein Society》2014,23(6):790-800
Repeat proteins have recently emerged as especially well‐suited alternative binding scaffolds due to their modular architecture and biophysical properties. Here we present the design of a scaffold based on the consensus sequence of the leucine rich repeat (LRR) domain of the NOD family of cytoplasmic innate immune system receptors. Consensus sequence design has emerged as a protein design tool to create de novo proteins that capture sequence‐structure relationships and interactions present in nature. The multiple sequence alignment of 311 individual LRRs, which are the putative ligand‐recognition domain in NOD proteins, resulted in a consensus sequence protein containing two internal and N‐ and C‐capping repeats named CLRR2. CLRR2 protein is a stable, monomeric, and cysteine free scaffold that without any affinity maturation displays micromolar binding to muramyl dipeptide, a bacterial cell wall fragment. To our knowledge, this is the first report of direct interaction of a NOD LRR with a physiologically relevant ligand. 相似文献
93.
Milan ?i?i? Miroslav ?ivi? Vuk Maksimovi? Marina Stani? Strahinja Kri?ak Tijana Cveti? Anti? Joanna Zakrzewska 《PloS one》2014,9(7)
The biological and chemical basis of vanadium action in fungi is relatively poorly understood. In the present study, we investigate the influence of vanadate (V5+) on phosphate metabolism of Phycomyces blakesleeanus. Addition of V5+ caused increase of sugar phosphates signal intensities in 31P NMR spectra in
vivo. HPLC analysis of mycelial phosphate extracts demonstrated increased concentrations of glucose 6 phosphate, fructose 6 phosphate, fructose 1, 6 phosphate and glucose 1 phosphate after V5+ treatment. Influence of V5+ on the levels of fructose 2, 6 phosphate, glucosamine 6 phosphate and glucose 1, 6 phosphate (HPLC), and polyphosphates, UDPG and ATP (31P NMR) was also established. Increase of sugar phosphates content was not observed after addition of vanadyl (V4+), indicating that only vanadate influences its metabolism. Obtained results from in
vivo experiments indicate catalytic/inhibitory vanadate action on enzymes involved in reactions of glycolysis and glycogenesis i.e., phosphoglucomutase, phosphofructokinase and glycogen phosphorylase in filamentous fungi. 相似文献
94.
Ke Jiang John Sanseverino Archana Chauhan Susan Lucas Alex Copeland Alla Lapidus Tijana Glavina Del Rio Eileen Dalin Hope Tice David Bruce Lynne Goodwin Sam Pitluck David Sims Thomas Brettin John C. Detter Cliff Han Y.J. Chang Frank Larimer Miriam Land Loren Hauser Nikos C. Kyrpides Natalia Mikhailova Scott Moser Patricia Jegier Dan Close Jennifer M. DeBruyn Ying Wang Alice C. Layton Michael S. Allen Gary S. Sayler 《Standards in genomic sciences》2012,6(3):325-335
95.
K Mavromatis O Chertkov A Lapidus M Nolan S Lucas H Tice TG Del Rio JF Cheng C Han R Tapia D Bruce LA Goodwin S Pitluck M Huntemann K Liolios I Pagani N Ivanova N Mikhailova A Pati A Chen K Palaniappan M Land EM Brambilla M Rohde S Spring M Göker JC Detter J Bristow JA Eisen V Markowitz P Hugenholtz NC Kyrpides HP Klenk T Woyke 《Standards in genomic sciences》2012,6(2):210-219
Saprospira grandis Gross 1911 is a member of the Saprospiraceae, a family in the class 'Sphingobacteria' that remains poorly characterized at the genomic level. The species is known for preying on other marine bacteria via 'ixotrophy'. S. grandis strain Sa g1 was isolated from decaying crab carapace in France and was selected for genome sequencing because of its isolated location in the tree of life. Only one type strain genome has been published so far from the Saprospiraceae, while the sequence of strain Sa g1 represents the second genome to be published from a non-type strain of S. grandis. Here we describe the features of this organism, together with the complete genome sequence and annotation. The 4,495,250 bp long Improved-High-Quality draft of the genome with its 3,536 protein-coding and 62 RNA genes is a part of the Genomic Encyclopedia of Bacteria and Archaea project. 相似文献
96.
Meincke L Copeland A Lapidus A Lucas S Berry KW Del Rio TG Hammon N Dalin E Tice H Pitluck S Richardson P Bruce D Goodwin L Han C Tapia R Detter JC Schmutz J Brettin T Larimer F Land M Hauser L Kyrpides NC Ivanova N Göker M Woyke T Wu QL Pöckl M Hahn MW Klenk HP 《Standards in genomic sciences》2012,6(1):74-83
Polynucleobacter necessarius subsp. asymbioticus strain QLW-P1DMWA-1(T) is a planktonic freshwater bacterium affiliated with the family Burkholderiaceae (class Betaproteobacteria). This strain is of interest because it represents a subspecies with cosmopolitan and ubiquitous distribution in standing freshwater systems. The 16S-23S ITS genotype represented by the sequenced strain comprised on average more than 10% of bacterioplankton in its home habitat. While all strains of the subspecies P. necessarius asymbioticus are free-living freshwater bacteria, strains belonging to the only other subspecies, P. necessarius subsp. necessarius are obligate endosymbionts of the ciliate Euplotes aediculatus. The two subspecies of P. necessarius are the instances of two closely related subspecies that differ in their lifestyle (free-living vs. obligate endosymbiont), and they are the only members of the genus Polynucleobacter with completely sequenced genomes. Here we describe the features of P. necessarius subsp. asymbioticus, together with the complete genome sequence and annotation. The 2,159,490 bp long chromosome with a total of 2,088 protein-coding and 48 RNA genes is the first completed genome sequence of the genus Polynucleobacter to be published and was sequenced as part of the DOE Joint Genome Institute Community Sequencing Program 2006. 相似文献
97.
M2 protein of influenza A viruses is a tetrameric transmembrane proton channel, which has essential functions both early and late in the virus infectious cycle. Previous studies of proton transport by M2 have been limited to measurements outside the context of the virus particle. We have developed an in vitro fluorescence-based assay to monitor internal acidification of individual virions triggered to undergo membrane fusion. We show that rimantadine, an inhibitor of M2 proton conductance, blocks the acidification-dependent dissipation of fluorescence from a pH-sensitive virus-content probe. Fusion-pore formation usually follows internal acidification but does not require it. The rate of internal virion acidification increases with external proton concentration and saturates with a pK(m) of ~4.7. The rate of proton transport through a single, fully protonated M2 channel is approximately 100 to 400 protons per second. The saturating proton-concentration dependence and the low rate of internal virion acidification derived from authentic virions support a transporter model for the mechanism of proton transfer. 相似文献
98.
99.
Cytochromes c6 and f react by three et mechanisms under similar conditions. We report temperature and viscosity effects on the protein docking and kinetics of 3Zncyt c6 + cyt f(III) → Zncyt c6+ + cyt f(II). At 0.5-40.0 °C, this reaction occurs within the persistent (associated) diprotein complex with the rate constant kpr and within the transient (collision) complex with the rate constant ktr. The viscosity independence of kpr, the donor-acceptor coupling Hab = (0.5 ± 0.1) cm−1, and reorganizational energy λ = (2.14 ± 0.02) eV indicate true et within the persistent complex. The viscosity dependence of ktr and a break at 30 °C in the Eyring plot for ktr reveal mechanisms within the transient complex that are reversibly switched by temperature change. Kramers protein friction parameters differ much for the reactions below (σ = 0.3 ± 0.1, δ = 0.85 ± 0.07) and above (σ = 4.0 ± 0.9, δ = 0.40 ± 0.06) 30 °C. The transient complex(es) undergo(es) coupled et below ca. 30 °C and gated et above ca. 30 °C. Brownian dynamics simulations reveal two broad, dynamic ensembles of configurations “bridged” by few intermediate configurations through which the interconversion presumably occurs. 相似文献
100.
Nikcević G Savić T Kovacević-Grujicić N Stevanović M 《Journal of neurochemistry》2008,107(5):1206-1215
Sox3/SOX3 gene is considered to be one of the earliest neural markers in vertebrates and it is implicated in the genetic cascades that direct brain formation. We have previously shown that early phases of differentiation and neural induction of NT2/D1 embryonal carcinoma cells by retinoic acid (RA) involve up-regulation of the SOX3 gene expression. Here, we present identification of a novel positive regulatory promoter element involved in RA-dependent activation of the SOX3 gene expression in NT2/D1 cells. This element represents a direct repeat 3-like motif that directly interacts with retinoid X receptor (RXR) alpha in a sequence-specific manner. It is capable of independently mediating the RA effect in a heterologous promoter context and its disruption caused significant reduction of RA/RXR transactivation of the SOX3 promoter. Furthermore, by using synthetic antagonists of retinoid receptors, we have shown for the first time, that RA-induced SOX3 gene expression could be significantly down-regulated by the synthetic antagonist of RXR. Also, this data showed that RXRs, but not RA receptors, are mediators of RA effect on the SOX3 gene up-regulation in NT2/D1 cells. Presented data will be valuable for future investigation of SOX3 gene expression, not only in NT2/D1 model system, but also in diverse developmental, physiological and pathological settings. 相似文献