2019
DOI: 10.1021/acs.orglett.9b01737
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Development of Powerful Auxiliary-Mediated Ligation To Facilitate Rapid Protein Assembly

Abstract: Here, we describe an Se-auxiliary mediated ligation protocol capable of rapid native chemical ligations at sterically hindered junctions, followed by in situ auxiliary cleavage under neutral conditions without affecting unprotected Cys residues. This auxiliary, which is prepared from phenyl acetaldehyde in one step, can be conveniently attached to the N-terminal region of a peptide via a reductive amination or coupling reaction. We demonstrated this methodology by synthesizing two protein samples.

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Cited by 17 publications
(27 citation statements)
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References 61 publications
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“…This chemical behavior contrasts with the known difficulty in breaking carbon-nitrogen bonds, a process that usually requires harsch conditions, 16,17 metal catalysis 18 or radical reactions. 19,20 In contrast, the detailed mechanistic investigations reported here point toward an anionic mechanism that depends on the ionization state of SetCys in its ring-opened and reduced form. In this respect, SetCys uncovers a novel mode of reactivity for Cys and provides a useful means for accessing complex protein scaffolds as illustrated by the total 3 one-pot synthesis of biologically active linear or backbone cyclized variants of the hepatocyte growth factor (HGF) kringle 1 (K1) domain.…”
Section: Introductionmentioning
confidence: 55%
“…This chemical behavior contrasts with the known difficulty in breaking carbon-nitrogen bonds, a process that usually requires harsch conditions, 16,17 metal catalysis 18 or radical reactions. 19,20 In contrast, the detailed mechanistic investigations reported here point toward an anionic mechanism that depends on the ionization state of SetCys in its ring-opened and reduced form. In this respect, SetCys uncovers a novel mode of reactivity for Cys and provides a useful means for accessing complex protein scaffolds as illustrated by the total 3 one-pot synthesis of biologically active linear or backbone cyclized variants of the hepatocyte growth factor (HGF) kringle 1 (K1) domain.…”
Section: Introductionmentioning
confidence: 55%
“…Kürzlich stellten Wang et al. eine Seleno‐Variante des MPE‐Auxiliares vor, das 2‐Seleno‐2‐phenethyl‐Auxiliar ( 13 ) [10] . Wie für Reaktionen, die auf Selenol‐Selenoesteraustausch basieren, erwartet, [11] vermittelte dieses Auxiliar sehr schnelle Ligationen.…”
Section: Einführungunclassified
“…Kanai und Otaka erklärten den vorteilhaften Effekt der 2‐Mercaptomethyl‐DMAP‐Systeme mit einer erhöhten Acidität der Thiolgruppe, die wiederum die Reaktivität der Acylkomponente des beim Thiol‐Austausch gebildeten Thioester‐Intermediates erhöhen würde. In Anbetracht der Tatsache, dass selbst NCL‐Reaktionen an selenomodifizierten Auxiliaren vor der Umlagerung abbrechen können, [10] denken wir, dass die Aktivierung der Acylkomponente nicht für die hohen Ligationsraten verantwortlich sein kann, die mit dem MPyE‐Auxiliar beobachtet wurden.…”
Section: Ergebnisse Und Diskussionunclassified
“…The subsequent auxiliary removal can be achieved with the treatment of morpholine and TCEP at slightly basic pH (Scheme ). Notably, such radical condition can tolerate unprotected Cys residue …”
Section: Other Ligation Techniquesmentioning
confidence: 99%