Nonribosomal

Luận văn được thực hiện với mục tiêu nhằm phân lập và đánh giá đa dạng xạ khuẩn nội sinh trên cây Màng tang thu thập tại tỉnh Phú Thọ; đánh giá khả năng kháng vi sinh vật kiểm định các chủng xạ khuẩn nội sinh và xác định sự có mặt của ba gen mã hóa các enzyme tham gia vào quá trình tổng hợp kháng sinh gồm polyketide synthases I (PKS-I), polyketide synthases II (PKS-II) và nonribosomal peptide synthetase (NRPS). Mời các bạn cùng tham khảo.

67p zhangyan 13-07-2021 41 6   Download

The initial condensation event in the nonribosomal biosyn-thesisof thepeptideantibioticsgramicidinSandtyrocidineA takes place between a phenylalanine activating racemase GrsA/TycAand the ®rst proline-activatingmodule ofGrsB/ TycB. Recently we established a minimalin vitro model system for NRPS with recombinant His6-tagged GrsA (GrsA Phe-ATE; 127 kDa) and TycB1 (TycB1Pro-CAT; 120 kDa) and demonstrated the catalytic function of the C-domaininTycB1Pro-CAT to form a peptide bond between phenylalanine and proline during diketopiperazine formation (DKP). ...

10p research12 23-04-2013 37 2   Download

The elongation phase of mRNA translation is the stage at which the polypeptide is assembled and requires a substantial amount of metabolic energy. Translation elongation in mammals requires a set of nonribosomal proteins called eukaryotic elongation actors or eEFs. Several of these proteins are subject to phosphorylation in mammalian cells, including the factors eEF1A and eEF1B that are involved in recruitment of amino acyl-tRNAs to the ribosome.

9p tumor12 22-04-2013 36 2   Download

Many pharmacologically important agents are assembled on multimodular nonribosomal peptide synthetases (NRPSs) whose modules comprise a set of core domains with all essential catalytic functions necessary for the incorporation and modification of one building block. Very often, d-amino acids are found in such products which, with few exceptions, are generated by the action of NRPS integrated epimerization (E) domains that alter the stereochemistry of the corresponding peptidyl carrier protein (PCP) bound l-intermediate....

15p fptmusic 12-04-2013 34 2   Download

Microorganisms produce a large number of pharmaco-logically and biotechnologically important peptides by using nonribosomal peptide synthetases (NRPSs). Due to their modular arrangement and their domain organization NRPSs are particularly suitable for engineering recom-binant proteins for the production of novel peptides with interesting properties.

9p fptmusic 12-04-2013 64 3   Download

This work presents a computational analysis of the molecular characteris-tics shared by the adenylation domains from traditional nonribosomal pep-tide synthetases (NRPSs) and the group of the freestanding homologous enzymes: a-aminoadipate semialdehyde dehydrogenase, a-aminoadipate reductase and the protein Ebony. The results of systematic sequence com-parisons allow us to conclude that a specificity-conferring code, similar to that described for the NRPSs, can be recognized in such enzymes.

13p awards 05-04-2013 35 3   Download

Recent studies on type II thioesterases (TEIIs) involved in microbial secondary metabolism described a role for these enzymes in the removal of short acyl-S- phosphopantetheine intermediates from misprimed holo-(acyl carrier proteins) and holo-(peptidyl carrier proteins) of polyketide synthases and nonribosomal peptide synthetases.

10p dell39 03-04-2013 55 4   Download

Aspergillus fumigatusis an important human fungal pathogen. The Asper-gillus fumigatus genome contains 14 nonribosomal peptide synthetase genes, potentially responsible for generating metabolites that contribute to organismal virulence. Differential expression of the nonribosomal peptide synthetase gene,pes1, in four strains of Aspergillus fumigatuswas observed.

16p inspiron33 25-03-2013 35 4   Download

Ribosome subunit assembly in bacteria is a fast and efficient process. Among the nonribosomal proteins involved in ribosome biogenesis are RNA helicases. We describe ribosome biogenesis inEscherichia colistrains lacking RNA helicase DeaD (CsdA) or DbpA.

11p galaxyss3 07-03-2013 32 3   Download

Daptomycin and A21987C antibiotics are branched, cyclic, nonribosomally assembled acidic lipodepsipeptides produced byStreptomyces roseosporus. The antibacterial activity of daptomycin against Gram-positive bacteria strongly depends on the nature of the N-terminal fatty acid moiety.

7p vinaphone15 28-02-2013 28 3   Download

The family of chromodepsipeptides constitutes a class of structurally related pseudosymmetrical peptidolactones and peptidothiolactones synthe-sized by nonribosomal peptide synthetases. The chromodepsipeptides, which are analogous to the extensively characterized echinomycin, attain their DNA-bisintercalating properties from chromophore moieties attached to the N-termini of the oligopeptide chain.

13p vinaphone15 27-02-2013 39 2   Download

Despite the unique phenotypic properties and clinical importance ofPeni-cillium marneffei, the polyketide synthase genes in its genome have never been characterized. Twenty-three putative polyketide synthase genes and two putative polyketide synthase nonribosomal peptide-synthase hybrid genes were identified in theP.

9p viettel02 19-02-2013 41 5   Download

Nonribosomal peptide synthetases serve as multidomain protein templates for producing a wealth of pharmaceutically important natural products. For the correct assembly of the desired natural product the interactions between the different catalytic centres and the reaction intermediates bound to the peptidyl carrier protein must be precisely controlled at spatial and temporal levels.

13p mobifone23 18-01-2013 43 3   Download

The class of nonribosomally assembled siderophores encompasses a multi-tude of structurally diverse natural products. The genome of the erythro-mycin-producing strainSaccharopolyspora erythraeacontains 25 secondary metabolite gene clusters that are mostly considered to be orphan, including two that are responsible for siderophore assembly.

14p mobifone23 18-01-2013 50 4   Download