Dec 05, 2014 · The DNA ligation reaction itself has two basic steps. Firstly the DNA ends have to collide by chance and stay together long enough for the ligase to join them. This is the most inefficient part of the reaction, but is easier at low temperatures.
Abstract. Abstract The traceless Staudinger ligation of azides and phosphines is an effective method to produce an amide bond. In this work, density functional theory (DFT) calculations were carried out to investigate the mechanism of the traceless Staudinger ligation, which suggested that its rate-limiting step was the attack of azide on phosphine leading to the formation of phosphazide. Keywords:Self-assembled monolayers (SAM), traceless staudinger ligation, biotinylation, surface modification, thiol-gold attachment, surface characterization. Abstract:Background: Formation of Self-assembled monolayers (SAMs) is one of the most widely used methods to modify a surface to achieve the desired property. It is a very unique, yet Direct Acyl Substitution of Carboxylic Acids: A Chemoselective O‐ to N‐Acyl Migration in the Traceless Staudinger Ligation Andrew D. Kosal Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, IN 46556 (USA), Fax: (+1) 574‐631‐6652 Apr 07, 2008 · Putative mechanism of the traceless Staudinger ligation. Recently, we reported a new reagent, di(4-methoxyphenyl)phosphinomethanethiol ( 2 ), that is effective at mediating ligations between encumbered residues. 12 Results indicated that electron-donating substituents on the aryl rings disfavor the formation of a side product, thereby leading The so-called traceless Staudinger ligation is a highly attractive process leading to a native amide bond without inclusion of the phosphine oxide in the final product. 6 The synthetic value of this remarkable transformation has been demonstrated by Raines and coworkers with the ligation of complex peptide fragments, possibly best illustrated Jan 01, 2009 · The traceless Staudinger ligation has joined the repertoire of ligation methods for the convergent synthesis of proteins. This method has been used along with others to assemble an entire protein. A putative strategy for the assembly of proteins is depicted in Fig. 4 ( Nilsson et al. , 2003b ).
Site‐Selective Traceless Staudinger Ligation for Glycoprotein Synthesis Reveals Scope and Limitations Dr. Gonçalo J. L. Bernardes Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, OX1 3TA Oxford (UK), Fax: (+44) 1865‐285002
BERKELEY, CA — No, the "Staudinger ligation" isn't the latest Robert Ludlum thriller; it's a new chemical reaction in a growing arsenal of cell engineering techniques developed by Carolyn Bertozzi of the Department of Energy's Lawrence Berkeley National Laboratory, a pioneer in modifying the surfaces of living cells.
Jul 12, 2006 · The traceless Staudinger ligation enables the formation of an amide bond between a phosphinothioester (or phosphinoester) and an azide without the incorporation of residual atoms. Here, the coupling of peptides by this reaction was characterized in detail.
Reaction mechanism of Staudinger reaction and reduction Staudinger ligation. Of interest in chemical biology research, the Staudinger ligation is a modification of the classical Staudinger reaction in which an electrophilic trap (usually a methyl ester) is placed on the triaryl phosphine.  the Ligation reaction an intramolecular acetylation of the iminophosphorane takes place, and after hydrolysis an amide bond is formed.5 In the traceless variant the arylphosphine is part of the leaving group, and just a na tive amide bond between the ligation partners is formed (Scheme 1).6 Thus the traceless Staudinger ligation is es Apr 23, 2013 · An efficient method has been developed for the salicylaldehyde ester-mediated ligation of unprotected peptides at serine (Ser) or threonine (Thr) residues. The utility of this peptide ligation approach has been demonstrated through the convergent syntheses of two therapeutic peptides––ovine-corticoliberin and Forteo––and the human erythrocyte acylphosphatase protein (∼11 kDa). Mar 12, 2013 · Staudinger ligation DOI: 10.1002/anie.201206533 Phosphine-Based Redox Catalysis in the Direct Traceless Staudinger Ligation of Carboxylic Acids and Azides** Andrew D. Kosal, Erin E. Wilson, and Brandon L. Ashfeld* The synthesis of amide C N bonds through nucleophilic acyl substitutions constitutes one of the most fundamental trans- Jul 29, 2018 · Traceless Staudinger Ligation 1.png 2,456 × 888; 30 KB Traceless Staudinger Ligation 2.png 2,629 × 539; 25 KB Traceless Staudinger Ligation 3.png 2,143 × 303; 19 KB