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Báo cáo khoa học: Concerted mutation of Phe residues belonging to the b-dystroglycan ectodomain strongly inhibits the interaction with a-dystroglycan in vitro pot

Tài liệu Báo cáo khoa học: Crystal structure of importin-a bound to a peptide bearing the nuclear localisation signal from chloride intracellular channel protein 4 ppt

Tài liệu Báo cáo khoa học: Crystal structure of importin-a bound to a peptide bearing the nuclear localisation signal from chloride intracellular channel protein 4 ppt

... determined the X-ray crystal structure of a truncated form of importin-a lacking the importin-b binding domain, bound to a CLIC4NLS peptide. The NLS peptide binds to the major binding site in anextended ... atits location with the hydroxyl group reaching the im-portin-a main chain near the C-terminus of the ARM1H3 helix. Most of the hydrophobic contacts with im-portin-a residues lining the P4 pocket ... cargo binding sites, referred to as the major and minor binding sites [1]. These sites arelocated in the concave face of the protein near regions of invariant Trp and Asn arrays. The major bindingsite...
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Tài liệu Báo cáo khoa học: Different modes of dipeptidyl peptidase IV (CD26) inhibition by oligopeptides derived from the N-terminus of HIV-1 Tat indicate at least two inhibitor binding sites doc

Tài liệu Báo cáo khoa học: Different modes of dipeptidyl peptidase IV (CD26) inhibition by oligopeptides derived from the N-terminus of HIV-1 Tat indicate at least two inhibitor binding sites doc

... able to interact with the N-terminus of the peptideitself but not with the enzyme. Interestingly, a hydrophobicinteractionofthesidechainofMet1ofTat(1–9)withthephenyl ring of Ala-Pro-pNA may hinder ... Ile8 of the peptide interacting with the Tyr752 hydroxyl group of the enzyme. A hydrophobicinteractionofthesidechainofMet1ofTat(1–9)withthephenyl ring of the substrate Ala-Pro-pNA resulted in ... complexes. The inhibitor is not able to bind to the competitive binding site. The IES complex is catalyti-cally inactive. The binding affinity of substrate and inhibitor to the free enzyme and to the...
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Báo cáo khoa học: Heterologous synthesis of cytochrome c¢ by Escherichia coli is not dependent on the System I cytochrome c biogenesis machinery ppt

Báo cáo khoa học: Heterologous synthesis of cytochrome c¢ by Escherichia coli is not dependent on the System I cytochrome c biogenesis machinery ppt

... corresponding to the PHCP proteinsequence of the 31st to 40th residues (Fig. 2), and a gene-spe-cific forward primer, PHcp03fw, corresponding to the sequence of the 45th to 53rd residues. The resulting ... protein was able to heter-ologously synthesize the PHCP and PH c552proteins,confirming that the observed difference between the two proteins in the RI242 strain is a result of the absence of the ... c552proteins,respectively. The band denoted by the asterisk on the right-handside is the result of nonspecific staining of the extracts containing the PH c552protein.Biogenesis of cytochrome...
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Báo cáo khoa học: Crystal structure of salt-tolerant glutaminase from Micrococcus luteus K-3 in the presence and absence of its product L-glutamate and its activator Tris pdf

Báo cáo khoa học: Crystal structure of salt-tolerant glutaminase from Micrococcus luteus K-3 in the presence and absence of its product L-glutamate and its activator Tris pdf

... aa; nine aa in total) were locatednear the interface of the physiological dimer. The C-terminal domain may contain structural featuresinvolved in protein–protein interactions to form the physiological ... differences in the interactions across the domain interface. All the resi-dues involved here seem to be unrelated to the Tris-binding site residues (including Arg223 and Ser227),either directly or indirectly. ... area of 233 A˚2. These findings suggest that the substrate-bind-ing pocket of Mglu is too large to bind l-asparagine with proper interactions.Effect of Tris on the structureTris was found to...
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Báo cáo khoa học: Secondary structure of lipidated Ras bound to a lipid bilayer pptx

Báo cáo khoa học: Secondary structure of lipidated Ras bound to a lipid bilayer pptx

... mea-sured in solution. Furthermore, it resembles the mean of an ensemble of 20 structures and thus indicates the dynamics of the protein, leading to changes in second-ary structure according to the ... flow.Protein incorporationAfter the formation of the model membrane, protein incor-poration was initiated by mixing the protein into the sample solution on the surface. The starting bulk concen-tration ... interactions of mem-brane-bound N-Ras protein with its effectors and regu-lators (i.e. Ras binding domain of Raf, guaninenucleotide exchange factors and GTPase activatingproteins), including possible...
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Báo cáo khoa học: Identification of crucial residues for the antibacterial activity of the proline-rich peptide, pyrrhocoricin pot

Báo cáo khoa học: Identification of crucial residues for the antibacterial activity of the proline-rich peptide, pyrrhocoricin pot

... reflected the presence of vital residues for the binding and flanking residues likely needed to maintain the structural integrity at the interaction sites(Fig. 7). The major drop in the fluorescence ... hence the interactive domain with the bacterialtarget protein, the C-terminal half aided the delivery of the pharmacophore into the interior of cells.These studies require a detailed analysis of ... in either the active site or in the C-terminal unit and binding to the protein fragmentwas strongly correlated. In addition, the native peptidelacked binding to the homologous region of mouse...
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Báo cáo khoa học: Different roles of functional residues in the hydrophobic binding site of two sweet orange tau glutathione S-transferases pdf

Báo cáo khoa học: Different roles of functional residues in the hydrophobic binding site of two sweet orange tau glutathione S-transferases pdf

... elements. The topological arrangement of these elements is usuallybababba, similar to the thioredoxin fold of otherGSH-binding or cysteine-binding proteins. The H-siteis entirely helical, with ... assistance interactions to the developing charge of the r-complex o-nitro group [33]. The comparison of the crystal structure of the rat M1-1 GST in complex with the transition state analogand with the ... shownthat the catalytic reaction of GmGSTU4-4 is barelysensitive to the nature of the leaving group, as the sub-stitution of the chlorine atom with the more electro-negative fluorine in the CDNB...
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Báo cáo khoa học: Recent contributions of in vitro models to our understanding of hepatitis C virus life cycle pdf

Báo cáo khoa học: Recent contributions of in vitro models to our understanding of hepatitis C virus life cycle pdf

... of CD81 in the binding process was further illustrated by the poor binding inhibition achieved in the presence of mAbs directed against CD81. In contrast, heparin sul-fate seemed to mediate this interaction ... Moreover, the chi-meric nature of the viruses and the intrinsic character-istics of the Huh7 cell line (its nonpermissiveness to infection with HCV-containing sera) limit absoluteextrapolation of the ... culture of infectedhepatocytes. To succeed in obtaining HCV infection in primary human hepatocytes, an existing model of hep-atitis B virus infection was used to determine optimalinfection...
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Tài liệu Báo cáo khoa học: Enhanced thermostability of methyl parathion hydrolase from Ochrobactrum sp. M231 by rational engineering of a glycine to proline mutation pdf

Tài liệu Báo cáo khoa học: Enhanced thermostability of methyl parathion hydrolase from Ochrobactrum sp. M231 by rational engineering of a glycine to proline mutation pdf

... 7.4) to determine the protein thermostability. The purified proteins were stored at )20 °C in aliquotsuntil use. The purity of the proteins was analyzed bySDS ⁄ PAGE followed by staining with ... MPH using pro-tein engineering. The two main protein-engineering strategies that canbe used to increase protein thermostability are rationaldesign and random mutagenesis [10–12]. Of these ... calculations The structures of the WT and mutant enzymes wereminimized using the discovery studio2.5.5 software with the ‘Minimization protocol’. The minimizationalgorithms of the Steepest...
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Tài liệu Báo cáo khoa học: Structural effects of a dimer interface mutation on catalytic activity of triosephosphate isomerase The role of conserved residues and complementary mutations pptx

Tài liệu Báo cáo khoa học: Structural effects of a dimer interface mutation on catalytic activity of triosephosphate isomerase The role of conserved residues and complementary mutations pptx

... revealed the importance of conserved residues in the vicinity of the active site that serve to position the functional K12 residue. The network of key interactions spans the interacting subunits. The ... the backbone CO of F102. Fur-thermore, the orientation of the side chain of the two residues brings the guanidinium plane and the aro-matic ring of F102 into close proximity, with analmost ... only criticalfor the stability of the dimer, it may also be involved in maintaining the integrity of the active site. These resultsclearly suggest that the dimer interface in the Y74W*mutant...
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