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báo cáo khoa học: " Engineering of an E coli outer membrane protein FhuA with increased channel diameter" doc

báo cáo khoa học:

báo cáo khoa học: " Engineering of an E. coli outer membrane protein FhuA with increased channel diameter" doc

... Access Engineering of an E. coli outer membrane protein FhuA with increased channel diameterManuel Krewinkel, Tamara Dworeck and Marco Fioroni*AbstractBackground: Channel proteins like FhuA can be an alternative ... between channel sur-face area in crease and kinetic results can be either dueto an increase in channel diameter or to an unlikelyincrease in the number of inserted protein channels of exactly ... previous study in which we addressed the lengthening of the channel, here wereport the increasing of the channel diameter by genetic engineering. Results: The FhuA Δ1-159 diameter increase has...
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báo cáo khoa học:

báo cáo khoa học: "Engineering of the E. coli Outer Membrane Protein FhuA to overcome the Hydrophobic Mismatch in Thick Polymeric Membranes" pdf

... the questionwhether the FhuA Δ1-159 Ext really acts as a channel or whether the observed kinetics are due to the locallyperturbed polymer membrane by the presence of the protein, the channel was ... to ensure the insertion of the FhuA Δ1-159Ext into the E. coli membrane. An increased hydrophobicmismatch between the protein and the lipid membrane would forbid the FhuA Δ1-159 Ext insertion, ... involved in closing the FhuA Δ1-159Ext channel upon labelling: four are buried within the channel and three are present on both channel entrances (see Figure 5). An average biotin concentration of...
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Báo cáo khoa học: Optimization of an Escherichia coli system for cell-free synthesis of selectively 15N-labelled proteins for rapid analysis by NMR spectroscopy pdf

Báo cáo khoa học: Optimization of an Escherichia coli system for cell-free synthesis of selectively 15N-labelled proteins for rapid analysis by NMR spectroscopy pdf

... further advantage of the T7 system lies in i tsbetter tolerance with respect to temperature changes:lowering the reaction temperature from 37 to 30 °Cdecreased protein yields insignificantly, ... tandemphage k pRand pLpromoters, when the reactions weresupplemented with purified phage T7 or E. coli RNApolymerase. Nineteen samples, each selectively labelled with a different15N-enriched amino ... whereas this tem-perature change re sulted in decreased y ields when theexpression was under c ontrol o f the k promoters. This maybe because pKE874 also directs low-level synthesis of athermolabile...
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Tài liệu Báo cáo khoa học: Expression of an a-1,3-glucanase during mycoparasitic interaction of Trichoderma asperellum docx

Tài liệu Báo cáo khoa học: Expression of an a-1,3-glucanase during mycoparasitic interaction of Trichoderma asperellum docx

... mm.Weused MALDI-TOF MS combined with PNGase F (NewEngland Biolabs, Herts, UK) treatment to identify itsN-glycan structures and their sites of expression. Protein sequence and degenerate primed ... growingcolonies of B. cinerea were placed in PDA plates covered with sterile cellophane sheets. Mycelia were allowed togrow for 48 h and then plugs from growing colonies of Trichoderma were placed 5 ... Glucose and cellulose oligosacha-rides (2–5 polymerization degree) were used as standards.Substrate controls were considered in each determination.Thermal stability of the enzyme was determined...
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Báo cáo khoa học: Inhibition of an iron-responsive element/iron regulatory protein-1 complex by ATP binding and hydrolysis docx

Báo cáo khoa học: Inhibition of an iron-responsive element/iron regulatory protein-1 complex by ATP binding and hydrolysis docx

... luciferin ⁄ luciferase assay kit,and expressed relative to the values in untreated control cells. Values are means ± SD from three independent experiments expressed relat-ive to control taken ... helicases, and RNA binding increases theATPase activity of these proteins [26]. To test whetherthe ATPase activity of IRP-1 is also enhanced in thepresence of IRE, we measured hydrolysis of [32P]ATP[cP] ... dilutedsample was added to a microplate, and 50 lL of ENLITENrL ⁄ L reagent was added immediately before measurementand mixed by repeated pipetting. Measurements were takenin a microplate luminometer...
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Báo cáo khoa học: Interaction of an  40 kDa protein from regenerating rat liver with the )148 to )124 region of c-jun complexed with RLjunRP coincides with enhanced c-jun expression in proliferating rat liver pdf

Báo cáo khoa học: Interaction of an  40 kDa protein from regenerating rat liver with the )148 to )124 region of c-jun complexed with RLjunRP coincides with enhanced c-jun expression in proliferating rat liver pdf

... performed with nRNE-d, lanes3 and 4 represen t EMSA performed with nuclear extracts prepared 8 hafter partial he patectomy an d lan es 5 and 6 represent EMSA performed with nuclear extracts prepared ... described earlier [ 19]. Fraction nRNE-d and rRNE-d wereseparated on 12% SDS/PAGE and electrophoreticallytransferred o nto a nitrocellulose membrane. The membrane was t hen incubated i n denaturing ... EMSAreactions w ere c arried outin the presence of 1 ng of rad iolab elled Jun-25and 100 lg(lanes1,3and5)and150lg (lanes 2, 4 and 6) o f nuclearextracts. Lanes 1 and 2 r e present EM SA performed...
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Báo cáo khoa học: Engineering of a monomeric and low-glycosylated form of human butyrylcholinesterase pdf

Báo cáo khoa học: Engineering of a monomeric and low-glycosylated form of human butyrylcholinesterase pdf

... sitesyielded poor expression levels as well (Table 2, seven andnine sites off) due to retention of the protein inside the cell,as shown by Western blotting. As the expression level of these ... bundle ( helices 383±372 and 526±543; humanTable 2. I n¯uence of the number and position of N-glycosylation sites on the expression level of secreted human BChE. The presence or absence of theoligomerization ... contributed to t he under-standing of some aspects of the difference in speci®citybetween AChE and B ChE, they are not satisfactory forenzyme engineering. The crystal structure of human BChEis expected...
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Báo cáo khoa học: Characterization of an N6 adenine methyltransferase from Helicobacter pylori strain 26695 which methylates adjacent adenines on the same strand pptx

Báo cáo khoa học: Characterization of an N6 adenine methyltransferase from Helicobacter pylori strain 26695 which methylates adjacent adenines on the same strand pptx

... of the F195S mutant,fluorescence emission spectra and fluorescence intensi-ties were measured in the presence of different concen-trations of AdoMet. The F195S mutant protein showed significantly ... adenine residues – one in theupper strand and one in the lower strand [24].Yetanother variation is seen in the case of MmeI, where ithas been reported that MmeI modifies the adenine inthe ... the absence of enzyme was subtractedand the data were analysed. All methylation experimentswere carried out at least in triplicate and the results wereaveraged. Standard deviations of the...
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Báo cáo khoa học:

Báo cáo khoa học: "Combination of an Automatic and an Interactive Disambiguation Method" docx

... preference. • The result is the candidate with the maximum occurrence probability. To show the iuformation mentioned above, candi- dates are expressed by the tree in Figure 1. This tree is an example ... low the root node needs not to be decided because they are leaf nodes. When more than two ambiguous words exist in an input sentence, a node may often have one that is not a leaf one. To calculate ... for experiments, and compared it with the method (abbreviated as MA) that executes in- teraction in all nodes. We set the following properties to the tree of can- didates. • the number of ambiguous...
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Báo cáo khoa học: Engineering of monomeric FK506-binding protein 22 with peptidyl prolyl cis-trans isomerase Importance of a V-shaped dimeric structure for binding to protein substrate docx

Báo cáo khoa học: Engineering of monomeric FK506-binding protein 22 with peptidyl prolyl cis-trans isomerase Importance of a V-shaped dimeric structure for binding to protein substrate docx

... and NNC-FKBP22. A His-tagattached to the N-termini of the proteins isrepresented by a shaded box. The a-helicesand b-strands are represented by cylindersand arrows, respectively. These secondarystructures ... closeproximity to the Met8 of the other monomer. Bothresidues are located close to the bottom of the cleft of the V-shaped structure. Therefore, it is stronglyexpected that the mutant protein, termed NNC-FKBP22, ... the presence or absence of the enzyme. The final concentrations of RNase T1and theenzyme were 0.2 lm and 10 nm, respectively. The refoldingreaction was monitored by measuring the increase in...
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