- CYCLIC PEPTIDE ANALOGS OF MELANOCORTIN AND AMANITIN AND METHODS OF MAKING SUCH
-
The invention described herein is based in part on the discovery of a protein/peptide crosslink, which introduces fluorescent properties, and which has been applied to synthesize analogues of melanocortin and amanitin as choice peptides to be explored in the context of isoindole peptides. Without limitation, it is expected that those trained in the art of peptide synthesis and stapling would appreciate the consequences of this invention such that other peptides of varied length can be similarly constrained by isoindole staples as featured herein.
- -
-
Paragraph 0114; 0116-0117; 0125
(2021/01/29)
-
- Photoresponsive transformation from spherical to nanotubular assemblies: Anticancer drug delivery using macrocyclic cationic gemini amphiphiles
-
We developed NIR-light-responsive macrocyclic cationic gemini amphiphiles, one of which displayed various favorable properties of lipids. The NIR-light-mediated cleavage of the strained dioxacycloundecine ring led to the conversion of the spherical to a n
- Dey, Subhasis,Chatterjee, Soumya,Patel, Anjali,Pradhan, Nirmalya,Srivastava, Diship,Patra, Niladri,Bhattacharyya, Arindam,Manna, Debasis
-
supporting information
p. 4646 - 4649
(2021/05/19)
-
- FlICk (fluorescent isoindole crosslinking) for peptide stapling
-
The rigidification of peptide secondary structure via stapling is an important and enduring goal in the development of functional peptides for biochemical and pharmaceutical applications. In addition, the incorporation of fluorophores and chromophores has
- Todorovic, Mihajlo,Perrin, David M.
-
p. 313 - 332
(2020/05/18)
-
- A Spiroalkylation Method for the Stereoselective Construction of α-Quaternary Carbons and Its Application to the Total Synthesis of (R)-Puraquinonic Acid
-
Cyclic α-quaternary carbon stereocenters were prepared from biselectrophillic substrates and an easily prepared chiral bicyclic sulfonyl lactam. This was achieved in two steps by spiroalkylation, employing biphasic reaction conditions with a phase-transfer catalyst, followed by reduction and alkylation with a series of alkyl halide electrophiles. The products of this method were isolated in good yields with with high levels of diastereoselectivity. This methodology was employed in the enantioselective total synthesis of (R)-puraquinonic acid (1) for a late-stage installation of the α-quaternary carbon stereocenter. This enabled the shortest synthesis of 1 to date, an eight-pot sequence providing an overall yield of 14%.
- Elmehriki, Adam A. H.,Gleason, James L.
-
supporting information
p. 9729 - 9733
(2019/12/02)
-
- Fluorescent Isoindole Crosslink (FlICk) Chemistry: A Rapid, User-friendly Stapling Reaction
-
The stabilization of peptide secondary structure via stapling is a ubiquitous goal for creating new probes, imaging agents, and drugs. Inspired by indole-derived crosslinks found in natural peptide toxins, we employed ortho-phthalaldehydes to create isoindole staples, thus transforming inactive linear and monocyclic precursors into bioactive monocyclic and bicyclic products. Mild, metal-free conditions give an array of macrocyclic α-melanocyte-stimulating hormone (α-MSH) derivatives, of which several isoindole-stapled α-MSH analogues (Ki≈1 nm) are found to be as potent as α-MSH. Analogously, late-stage intra-annular isoindole stapling furnished a bicyclic peptide mimic of α-amanitin that is cytotoxic to CHO cells (IC50=70 μm). Given its user-friendliness, we have termed this approach FlICk (fluorescent isoindole crosslink) chemistry.
- Todorovic, Mihajlo,Schwab, Katerina D.,Zeisler, Jutta,Zhang, Chengcheng,Bénard, Francois,Perrin, David M.
-
supporting information
p. 14120 - 14124
(2019/07/31)
-