188109-89-9Relevant academic research and scientific papers
Internal Activation of Peptidyl Prolyl Thioesters in Native Chemical Ligation
Gui, Yue,Qiu, Lingqi,Li, Yaohao,Li, Hongxing,Dong, Suwei
, p. 4890 - 4899 (2016/05/10)
Prolyl thioesters have shown significantly lower reactivities in native chemical ligation (NCL) in comparison to that of the alanyl thioester. This report describes a mild and efficient internal activation protocol of peptidyl prolyl thioesters in NCL without using any thiol-based additives, where the introduction of a 4-mercaptan substituent on the C-terminal proline significantly improves the reactivity of prolyl thioesters via the formation of a bicyclic thiolactone intermediate. The kinetic data indicate that the reaction rate is comparable to that of the reported data of alanyl thioesters, and the mechanistic studies suggest that the ligation of two peptide segments proceeds through an NCL-like pathway instead of a direct aminolysis, which ensures the chemoselectivity and compatibility of various amino acid side chains. This 4-mercaptoprolyl thioester-based protocol also allows an efficient one-pot ligation-desulfurization procedure. The utility of this method has been further demonstrated in the synthesis of a proline-rich region of Wilms tumor protein 1.
POTENT AND SELECTIVE INHIBITORS OF HEPATITIS C VIRUS
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Page/Page column 32, (2015/11/09)
The present invention is directed to compounds, compositions and methods for treating or preventing hepatitis C virus (HCV) infection in human subjects or other animal hosts. The compounds are as also pharmaceutically acceptable, salts, prodrugs, and othe
HEPATITIS C INHIBITOR COMPOUNDS
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, (2012/05/04)
Compounds of Formula (I) and (II) wherein R1, R2, R3, R6, A and A' are defined herein. The compounds are useful as inhibitors of the function of NS5A protein encoded by HCV for the treatment of hepatitis C viral infection.
Chemotactic peptides: fMLF-OMe analogues incorporating proline-methionine chimeras as N-terminal residue
Mollica, Adriano,Paradisi, Mario Paglialunga,Varani, Katia,Spisani, Susanna,Lucente, Gino
, p. 2253 - 2265 (2007/10/03)
The new fMLF analogues 1-4, incorporating chimeric S-proline-methionine residues (namely the homochiral cis-4(S)-methylthio-(S)-proline (10) and the heterochiral trans-4(R)-methylthio-(S)-proline) (17) in place of the native S-methionine, have been prepared; their solution conformation and activity as agonists or antagonists of formylpeptide receptors have been studied. In addition to peptides 1-4, which maintain the Met γ-thiomethyl-ether function, the analogues Boc-PLF-OMe (18) and For-PLF-OMe (19) devoid, as compared with 1-4, of position 1 side chain, have been synthesized and their activity examined.
