Báo cáo khoa học: Crystal structures of HIV protease V82A and L90M mutants reveal changes in the indinavir-binding site potx

... in the active site of the protease that is critical to inhibitor binding, L90M isdistal to the inhibitor-binding site and is located near the dimerization interface. The kinetic parameters of ... crystal structure of the L63P/V82T/I84V mutant with indinavir[20]. Our structures of PR V82A and PR L90M showedopposite changes in the main chain atoms of residues81–82, and PR L90M also had changes in the ... ordered in all three structures and the side chain ﬁtted well in the S2 binding pocket created by the t-butyl group of indinavir. Ile50, on the other hand, wasdisordered in all the structures and...

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

... On the basis of their crystal structures and the conserved amino acid residues (aa) of their active sites, these glutaminases are classiﬁedinto a large group of bacterial penicillin-bindingproteins ... region of the C-terminaldomain; however, we failed to determine the structure of the intact glutaminase because the crystals exhib-ited heavy twinning. In the present study, we foundnew crystallization ... Active sites of Mglu and Bacillus glutaminase in the presence and absence of ligands. Backbone atoms of the seven conservedamino acid residues and the three conserved tyrosine residues in Mglu and...

Tài liệu Báo cáo khoa học: Crystal structures of the regulatory subunit of Thr-sensitive aspartate kinase fromThermus thermophilus pdf

... In the absence of Thr, an outwardshift of b-strands near the Thr-binding site (site 1) and a concomitant loss of the electron density of the loop region between b3 and b4 near the Thr-binding ... differencebetween the structures is that the electron density of the b3–b4 loop around the Thr-binding site is missing in TtAKb-free, and that b-strands surrounding the Thr-binding site show outward shifts in ... in the A chain, and residues in green are in the B chain. (C) Vacant Thr-binding site in TtAKb-free. Residues in blue are in the E chain, and residues in orange are in the F chain. (D) Structure-based...

Tài liệu Báo cáo khoa học: Crystal structures of a bacterial 6-phosphogluconate dehydrogenase reveal aspects of speciﬁcity, mechanism and mode of inhibition by analogues of high-energy reaction intermediates pdf

... surface area of 6200 A˚2. The cofactor-binding site The cofactor binds on the periphery of domain I(Figs 3B,4) with the adenine ribose approaching the b1–a1 turn that carries the ﬁngerprint motif ... [12]. In TbPDH, the alanine in this motifis replaced by glycine suggesting less steric in uence oncofactor binding. The adenine stacks against the Arg34guanidinium group. This arginine, essential ... ﬂoor of the active site. The C1 of 6PG isplaced near to the cofactor-binding domain with the phosphate directed to the loop between a10–a11 and the tail domain of the partner subunit. There are...

Báo cáo khoa học: Crystal structures of the apo form of b-fructofuranosidase from Biﬁdobacterium longum and its complex with fructose pot

... containing two domains: an N-terminal five-bladedb-propeller and a C-terminal b-sandwich module. The active site is located in the centre of the b-propeller domain, in the bottom of a ‘funnel’. The binding ... IV and V blades and b-strands (1–6) from the internal b-sheet of the b-sand-wich domain. The last four amino acids of the nativesequence at the C-terminus and the His-tag protrudefrom the ... 2A). The first strand of each blade createsan internal surface of the ‘whirl’ and all five strands gofrom the substrate entrance direction, ending on the opposite site of the cylindrical N-terminal...

Báo cáo khoa học: Crystal structures of Nipah and Hendra virus fusion core proteins ppt

... out of nine changes (including one A to V) occur in the e and g positions of HR1, and six out of nine changes (including two L to I and one I to V) occur in HR2 at the a and d positions. In contrast, ... closetogether. A region of about 270 amino acids wouldbe located at the other end of the six-helix bundlebetween HR1 and HR2 in the postfusion state of NiVF protein. The eight amino acids in the linker ... asymmetric unit include residues 143–176 in HR1 and 455–484 in HR2, 143–175 in HR1 and 454–484 in HR2, and 143–177 in HR1 and 457–484 in HR2, respectively. The rmsd of the NiV two-helix and the HeV...

Báo cáo khoa học: Crystal structures of the human SUMO-2 protein at 1.6 A and 1.2 A resolution ppt

... 45–58 in the former model and 40 , 49 and 55–58 in the latter model of SUMO-2 and the equivalents of ubiquitin. Although the sequences have only 18% identity, the protein folds of SUMO-2 and ubiquitin ... partic-ularly evident in the regions of 28–43 and 71–83, thatcorrespond to the strand b2, the N terminus of the h elix a1, the helix a2, and the connecting loop to the strand b5(Fig. 3 A,D).SuchalargedifferencebetweentheNMRandcrystal structures ... side chainon the target protein via an isopeptide bond with itsC-terminal glycine. There are at least four SUMO proteins in humans, wh ich are involved in protein traﬃcking and tar-geting. A...

Báo cáo khoa học: Crystal structures of open and closed forms of D-serine deaminase from Salmonella typhimurium – implications on substrate speciﬁcity and catalysis pptx

... diverse family of proteins involved in the metabolism of amino acids, amino sugars and aminogroup containing lipids. A majority of them are keyenzymes in the metabolism of amino acids. The reac-tions ... H3 and H19 and the antiparallel b strand S1 in the largedomain and the helices H5 and H8 in the small domainare signiﬁcantly different and could be considered asadditions to the fold of the ... Leu338 and Ile115. These residues may limit the tilting of the pyridine ring between the internal and external aldi-mine forms [31]. The side chain of Asn168 and the hydroxyl group of Thr422 are...

Báo cáo khoa học: Crystal structures of open and closed forms of cyclo⁄maltodextrin-binding protein pptx

... described in (A) and (B). (E) Alignment of the primary structures of hinge-1 and hinge-2 of TvuCMBP and related solute-binding proteins. PfuMBP,P. furiosus maltodextrin-binding protein (amino acid ... forEcoMBP, and the bending and twist angles (35° and ABCDEFig. 6. Structures of the hinge regions of TvuCMBP–a-CD and TvuCMBP–G4. (A, B) Comparison of the residues in and aroundhinge-1 and hinge-2. ... the ligands.Hinge bendingWe determined the range of the hinge region bendingby comparing the open and closed conformations of TvuCMBP and superposing the N-domains orC-domains (Fig. 6). The critical...

Báo cáo khoa học: Crystal structures of bovine odorant-binding protein in complex with odorant molecules doc

... [3], a family of proteins generally involved in the transport of hydrophobic ligands [4]. The hypothesis of their involvement in the olfactory process, perception and transduction of the signal, ... onformational changes involving protein loops or backbone. T hus, the role of OBP in signal triggering remains unresolved.3Keywords: crystal str ucture; domain swapping; odorant-binding protein; olfaction.Odorant-binding ... 7150–7155].These features led us to investigate the binding of odorantmolecules with bOBP in solution and in the crystal. The behavior of odorant m olecules in bOBP resembles thatobserved with porcine...

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