structural and functional insights
Báo cáo khoa học: Structural and functional insights into Erwinia carotovora L-asparaginase ppt
... both EcAII and ErA To gain further insights into EwA and to assess its suitability as a drug candidate, we have determined the crystal structure of the enzyme in the presence of Asp and carried ... parameters, such as oligomerization and thermal stability, were overlooked Hence, a clear understanding of the catalytic activity, conformational stability and structural properties is required ... the overall fold and active site orientation One structurally important difference found between EwA and EcAII is the presence of a single disulde bond in EcAII, involving Cys77 and Cys105 This...
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Tài liệu Báo cáo khoa học: Structural and functional studies of the human phosphoribosyltransferase domain containing protein 1 docx
... Agricultural Sciences and Spatial Planning (to L.W and S.E.), the 4928 Swedish Research Council (to H.E and P.N.) and the Swedish Cancer Foundation (to H.E and P.N.) The Structural Genomics Consortium ... domain is mainly built up by residues from the C-terminus and consists of a two-stranded anti-parallel b-sheet composed of b2 and b9 and an a-helix from the C-terminus (Fig 1A) The two subunits ... PRTFDC1 (A) monomer and (B) tetramer generated using symmetry-related molecules Interactions with GMP (C) GMP, phosphate and calcium ions are shown as sticks and spheres colored pink and black, respectively...
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Tài liệu Báo cáo khoa học: Studies on structural and functional divergence among seven WhiB proteins of Mycobacterium tuberculosis H37Rv pdf
... signature), 218 nm (b strand signature), 202–204 nm (random coil signature) In WhiB5 and WhiB6, the structure was dominated by a helices and b strands and the proportion of these structural elements ... refolding were 98% pure and were brownish (Figs S1 and S2) The presence of four conserved cysteines and the brownish appearance of purified WhiB1, WhiB2, WhiB5, WhiB6 and WhiB7 indicated the presence ... WhiB6 and WhiB7 the loss was 8–10% After 48 h of air exposure, losses were as follows: 80% in WhiB1, 75% in WhiB2 and WhiB5, 65% in WhiB3, 60% in WhiB4, and 35–40% in WhiB6 and WhiB7...
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Tài liệu Báo cáo khoa học: Structural and functional studies on a mesophilic stationary phase survival protein (Sur E) from Salmonella typhimurium ppt
... between R81 and P82 and between G90 and I91 A similar cis peptide between G93 and V94 is found in Tm SurE also Overall structural features of the protein St SurE is an aba sandwich protein and adopts ... archaic and thermophilic homologues The St SurE monomer consists of 13 b-strands, six a-helices and three 310-helices The core of the protein is made up of a nine-stranded b-sheet flanked by a1, a5 and ... are represented by pink, cyan, blue and yellow, respectively The tetrameric interactions are between the subunits A and C, and B and D, by way of the b hairpins and the loop, which connects b2 to...
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Tài liệu Báo cáo khoa học: Interleukin-1-inducible MCPIP protein has structural and functional properties of RNase and participates in degradation of IL-1b mRNA doc
... lanes 2,3 and 4, lower band) The levels of mutant and wild-type MCPIP mRNAs were higher when these vectors were co-transfected with a vector overexpressing IL-1b (Fig 5, lanes and 4, upper bands) ... intermediate levels in heart and placenta, and the lowest levels in spleen, kidney, liver and lung The transcript was not detectable in brain, thymus, muscles, small intestine and colon (Fig 3A) The ... within the PIN domain (D141A and D226A) Transcription was inhibited by addition of actinomycin D, and RNA was collected after 3, and h The mRNA level for IL-1b (top panel) and MCPIP (bottom panel)...
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Tài liệu Báo cáo khoa học: Structural and functional investigations of Ureaplasma parvum UMP kinase – a potential antibacterial drug target ppt
... D and E + F), (b) a few hydrogen bonds, and a hydrophobic interaction between A + C, B + E and D + F, and (c) electrostatic forces in the central channel of the hexamer between B, C and F, and ... water molecule fixing the three lysines from the B, C and F subunits, and there is no direct interaction between subunits A and F, B and D, or C and E A phosphate ion was found in the donor site ... Ala The mutant enzymes, F133N and F133A, were expressed, purified and characterized With mm UMP and ATP as substrates, the activities of F133N and F133A were only 50 and 20% of that of the wild-type...
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Tài liệu Báo cáo khoa học: Structural and functional specificities of PDGF-C and PDGF-D, the novel members of the platelet-derived growth factors family docx
... chromosomes; PDGF-a and -b on chromosomes and 22 [17,18], and PDGF-c and -d on chromosomes and 11 [19], respectively The genomic organization of the pdgf genes is quite similar, although PDGF-c and -d genes ... exons in PDGF-c (exons and 6) and PDGF-d (exons and 7) encoding the cystine knot motifs resemble the corresponding exons in the PDGF-a and -b (exons and 5) genes Both in PDGF-a and -b, exon encodes ... While PDGF-A and -B can form both homo- and heterodimers (PDGF-AA, -AB, -BB), PDGF-C and -D exist only as homodimers (PDGF-CC and -DD) The full-length PDGF-C and -D monomers are 54–55 kDa and 49–56...
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Tài liệu Báo cáo khoa học: Fish and molluscan metallothioneins A structural and functional comparison ppt
... concentrations: 40 and 80 mM (lanes and 3) for h MTs were also treated for the same period with a reducing agent (dithiothreitol) at 40 and 80 mM (lanes and 5) To reduce aggregation, MT samples were handled ... urchin, snail and oyster) have so far been elucidated [11–17] As in mammals and fish [18], echinoderm MTs contain two globular domains binding four and three bivalent ions [19] On the other hand, in ... Vergani et al right-handed b domain binds three bivalent metal ions The C-terminal a domain is left-handed and binds four bivalent ions Zinc is preferentially located in the b domain and cadmium in...
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Báo cáo khoa học: Structural and functional aspects of unique type IV secretory components in the Helicobacter pylori cag-pathogenicity island potx
... be distinguished Helices B, E, F and H, arranged in an up -and- down topology, form the structural core, whereas the short helices C, D and G on one side, and A, I and J on the other, represent types ... glutamate and aspartate residues confined to the portion of the molecule involving a-helix A, the nearby loop, the first and last turns of helices E and F, and the C-terminus helices I and J In ... b-sheet flanked by a-helices Five b-strands, labelled from A to E, run all contiguous The N-terminus of the monomer includes strand A, an a-helix and a long stretch, and the C-terminal portion includes...
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Báo cáo khoa học: Glutamic acid residues in the C-terminal extension of small heat shock protein 25 are critical for structural and functional integrity pptx
... of polar and charged groups, as well as hydrophobic and packing effects [28] These proteins typically have a higher proportion of polar and charged residues, primarily glutamic acid and lysine, ... 17 Andley UP, Mathur S, Griest TA & Petrash JM (1996) Cloning, expression, and chaperone-like activity of human aA-crystallin J Biol Chem 271, 31973–31980 18 Fernando P & Heikkila JJ (2000) Functional ... protein–solvent interactions: thermostability and the role of hydrophobic and electrostatic interactions Protein Sci 4, 1516–1527 Cambillau C & Claverie J-M (2000) Structural and genomic correlates of hyperthermostability...
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Báo cáo khoa học: Structural and thermodynamic insights into the binding mode of five novel inhibitors of lumazine synthase from Mycobacterium tuberculosis pptx
... residues 5861 from loop connecting b3 and a and residues 8187 from loop connecting b4 and a3 from one subunit and the residues 114 and 128141 from b5 and a4- and a5-helices from the neighbouring subunit ... coloured in brown (A- and F-subunits), pink (B- and J-subunits), light brown (C- and I-subunits), light pink (D- and H-subunits) and beige (E- and G-subunits) The active sites, located between ... Pro51, Val53, Leu69, Leu156 and Ala158 Whereas four arginines (Arg19, Arg71, Arg154 and Arg157), two histidines (His73 and His159), two aspartates (Asp50 and Asp74) and Glu68 form ionic interactions...
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Báo cáo khoa học: Structural and functional roles for b-strand 7 in the a-crystallin domain of p26, a polydisperse small heat shock protein from Artemia franciscana pdf
... dimers, with monomers A and B in dimer and C and D in dimer (Fig 8) The a-crystallin domain of each monomer is composed of nine b-strands (labeled b2–b10), with the b6 strand situated in a large ... formation depends upon contact of b-strand 10 from the C-terminal extensions of monomers A and D with b-strands and in the a-crystallin domain of monomers C and B, respectively (Fig 8) A more prominent ... parent monomer Monomers A (green) and B (yellow) form dimer 1, while monomers C (red) and D (blue) form dimer L5 ⁄ 7, the loop between b-strands and which contains b-strand 6; N term, amino terminus...
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Báo cáo khoa học: Structural and functional analysis of the interaction of the AAA-peroxins Pex1p and Pex6p pptx
... Here we confirm and extend earlier studies of these AAA-peroxins and give a further detailed functional analysis of their cassette structure and interaction The interaction of Pex1p and Pex6p involves ... for ATP-binding and ATP-hydrolysis [19,20] Pex1p and Pex6p are functionally nonredundant AAA-proteins required for the biogenesis of peroxisomes A direct interaction of Pex1p and Pex6p has been ... function of Pex1p and Pex6p functions and proteolysis [17,18] AAA-proteins share the presence of one or two AAA-cassettes, comprising about 230 amino acids and are characterized by WalkerA and B motifs...
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Báo cáo khoa học: Structural and functional evidence for a singular repertoire of BMP receptor signal transducing proteins in the lophotrochozoan Crassostrea gigas suggests a shared ancestral BMP/activin pathway docx
... and functional BMP ⁄ activin pathway in lophotrochozoans, for which a singular and promiscuous type II receptor would be the shared interface for both BMP and activin ligands Results Type I and ... cloning and functional study of the central part of the BMP pathway (the Cg-BMPR1 type I receptor and Cg-TGFbsfR2 type II receptor) This shows probably the most ancestral and unusual functional ... bold and underlined, and the cysteine knot is boxed The second extracellular domain (C2) also contained 10 cysteines and these are also shown in bold and the cysteine knot is boxed The C1 and...
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Báo cáo khoa học: Plant oxylipins: Plant responses to 12-oxo-phytodienoic acid are governed by its specific structural and functional properties ppt
... but also directly to enzymes and transcription factors OPDA: an independent regulator of gene expression Given the functional and structural differences between OPDA and JA, it is exciting to presume ... of structurally related compounds and their role in cellular stress responses is a very intriguing and challenging matter of actual research The latter compounds comprise oxidized lipids and ... FEBS C Bottcher and S Pollmann ¨ for growth inhibitory effects and the development of necrotic lesions [56] Studies on flu and the flu ⁄ dde2-2 double mutant indicated that OPDA and ⁄ or dnOPDA...
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Báo cáo khoa học: Structural and functional characterization of human Iba proteins ppt
... composed mainly of a helices (Figs and 2) The core of Iba2 is a pair of EF-hand motifs, denoted as EF-hands and 2, each consisting of two a helices (aA, aB and aC, aD, respectively) anking a ... similarities to classical EF-hand proteins The second pair of EF-hands in calmodulin (PDB code 1CLL) [19] and the second pair of EF-hands in troponin C (PDB code 1NCX) [20] are structurally closely related ... and the conformational change of EF-hand proteins upon Ca2+ binding [18] Thus, it may be concluded that EF-hand of the Iba proteins is not capable of functional Ca2+ binding Function of EF-hand...
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Báo cáo khoa học: Structural and functional consequences of single amino acid substitutions in the pyrimidine base binding pocket of Escherichia coli CMP kinase pdf
... structures of CMP and UMP, and interactions between the cytosine moiety of nucleotide and various side chains of wild-type CMP kinase (Upper) Chemical differences between CMP and UMP are indicated ... from R110 and S36 could not be established with UMP Each of these residues could, in principle, also be important for stability of the protein Partial coupling between the structural and functional ... of relaxation, and in the case of S36A, no relaxation at all The rst type of relaxation (structural relaxation), which involves only proton and side chain motions, is seen in D132 and R110 mutants...
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Báo cáo khóa học: Structural and functional comparison of 15S- and 15R-specific cyclooxygenases from the coral Plexaura homomalla potx
... Cay and Cat Island) were obtained as a generous gift from J Sanchez, SUNY, Buffalo, NY [1-14C]Arachidonic acid was from Amersham Pharmacia Biotech Hydroxyeicosatetraenoic acid (HETE) and PG standards ... ether/acetic acid (3 : : 0.05, v/v/v) Incubation products and unlabelled authentic PG and HETE standards were visualized with an anisaldehyde spray reagent and brief heating at 90 °C [28] For product quantification, ... methanol, and the radioactivity was measured by liquid scintillation counting as described before [29] Results PCR cloning and structural analysis We obtained P homomalla samples from the Bahamas and...
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Báo cáo khoa học: Disruption of structural and functional integrity of a2-macroglobulin by cathepsin E pptx
... selectively associated with cathepsin E below pH 5.0 and rapidly cleaved it at a specific site distinct from the bait region, thereby losing its structural and functional integrity against 20 mM Hepes buffer, ... gel) under reducing conditions and then transferred onto poly(vinylidene difluoride) membranes and stained with Coomassie blue R-250 The stained bands were excised and the adsorbed proteins were ... activities of cathepsin E and cathepsin D The Hb-hydrolyzing activity of cathepsin E purified from human erythrocytes and rat spleen and cathepsin D purified from bovine spleen and rat spleen (0.01...
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Báo cáo Y học: Structural and functional characterization of a C-type lectin-like antifreeze protein from rainbow smelt (Osmerus mordax) potx
... was to investigate the structural and functional characteristics of smelt type II AFP The effects and inter-relationship of metal ion binding, N-linked glycosylation, and quaternary structure ... both untreated and deglycosylated smelt AFP were digested with Glu-C and trypsin in the presence and absence of Ca2+ Both enzymes generated some proteolysis near the N-terminus and/ or C-terminus ... resistant both in the presence and absence of Ca2+ and with and without the N-linked oligosaccharide Similar digestion patterns were also seen in both the untreated and deglycosylated smelt AFP...
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