- CYCLIC COMPOUNDS AND METHODS OF MAKING AND USING
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Disclosed are compounds and methods for highly effective chemoselective peptide cyclization and bicyclization directly on unprotected peptides and other compounds as well as the compounds produced by the methods, which have a novel structural motif. The fast reaction rate and operational simplicity render this method to be highly effective to synthesize cyclic structures, i.e. cyclic peptides. The cyclic compounds allow for various functionalities useful in chemical biology study and drug discovery.
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Page/Page column 110
(2020/10/19)
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- Chemoselective Peptide Cyclization and Bicyclization Directly on Unprotected Peptides
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Cyclic peptides are drawing wide attention as potential medium-sized modulators of biomolecular interactions with large binding surfaces. Simple but effective peptide cyclization methods are needed to construct cyclic peptide libraries by both peptide and nonpeptide chemists. Herein, we report a highly chemoselective and operation-simple method directly cyclizing unprotected peptides, in which ortho-phthalaldehyde (OPA) is found to react with the lysine/N-terminus and cysteine within one unprotected peptide sequence effectively to form the isoindole-bridged cyclic peptides. This reaction is carried out in the aqueous buffer and features tolerance of diverse functionalities, rapid and clean transformation, and operational simplicity. In addition, OPA peptide cyclization can also be combined with native chemical ligation-mediated cyclization to generate bicyclic peptides. Furthermore, the OPA peptide cyclization product can further react with the N-maleimide moiety in a one-pot manner to introduce additional functional motifs, like a fluorophore probe, biomolecules (e.g., glycan, peptide, or DNA). This OPA-cyclization method extends the toolbox for integrating postcyclization modification and bioconjugation into peptide cyclization with an all-in-one manner strategy.
- Zhang, Yue,Zhang, Qing,Wong, Clarence T. T.,Li, Xuechen
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supporting information
p. 12274 - 12279
(2019/08/20)
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- PHARMACEUTICAL COMPOSITIONS COMPRISING MACROLIDE DIASTEREOMERS, METHODS OF THEIR SYNTHESIS AND THERAPEUTIC USES
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The disclosure relates to compositions comprising diastereomer of a macrolide exhibiting improved therapeutic profile in the context of inhibiting cell proliferation compared to the corresponding compositions comprising mixture of diastereomers. The discl
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Paragraph 00103
(2015/03/16)
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- ANTICANCER CONJUGATE
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An anticancer conjugate, which comprises a fusion protein comprising domain (a), which is the functional fragment of a sequence of soluble human TRAIL (hTRAIL) protein beginning with an amino acid at a position not lower than hTRAIL95 or a sequence having at least 70% identity with said functional fragment, domain (b) which is the sequence of an effector peptide having proapoptotic, antiangiogenic, antiproliferative or pore forming activity, and conjugation domain (d) for attachment of a chemical compound selected from the group consisting of the sequences Cys Ala Ala Ala Cys Ala Ala Cys and Cys Ala Ala Cys Ala Ala Ala Cys, and a molecule of a chemical compound Z having antiblastic activity, which is attached to said conjugation domain (d) of said fusion protein directly or via a conjugation linker L.
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Page/Page column 63
(2014/09/29)
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- Azide-alkyne cycloaddition for universal post-synthetic modifications of nucleic acids and effective synthesis of bioactive nucleic acid conjugates
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The regioselective post-synthetic modifications of nucleic acids are essential to studies of these molecules for science and applications. Here we report a facile universal approach by harnessing versatile phosphoramidation reactions to regioselectively incorporate alkynyl/azido groups into post-synthetic nucleic acids primed with phosphate at the 5′ termini. With and without the presence of copper, the modified nucleic acids were subjected to azide-alkyne cycloaddition to afford various nucleic acid conjugates including a peptide-oligonucleotide conjugate (POC) with high yield. The POC was inoculated with human A549 cells and demonstrated excellent cell-penetrating ability despite cell deformation caused by a small amount of residual copper chelated to the POC. The combination of phosphoramidation and azide-alkyne cycloaddition reactions thus provides a universal regioselective strategy to post-synthetically modify nucleic acids. This study also explicated the toxicity of residual copper in synthesized bioconjugates destined for biological systems. This journal is the Partner Organisations 2014.
- Su, Yu-Chih,Lo, Yu-Lun,Hwang, Chi-Ching,Wang, Li-Fang,Wu, Min Hui,Wang, Eng-Chi,Wang, Yun-Ming,Wang, Tzu-Pin
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p. 6624 - 6633
(2014/08/18)
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- N-(3-Triethoxysilylpropyl)-4-(N′-maleimidylmethyl)cyclohexanamide (TPMC): A heterobifunctional reagent for immobilization of oligonucleotides on glass surface
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A new heterobifunctional reagent, namely, N-(3-triethoxysilylpropyl)-4-(N′-maleimidylmethyl)cyclohexanamide (TPMC) was developed and its potentiality for fixing of thiol (-SH) modified oligonucleotides were tested. The covalent attachment of oligonucleoti
- Misra, Arvind
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p. 3749 - 3753
(2008/02/10)
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