Preptin Analogues: Chemical Synthesis, Secondary Structure and Biological Studies
摘要:
Peptide hormones that modulate insulin secretion have been recognized to have therapeutic potential, with peptides such as amylin (pramlintide acetate, Symlin) and exendin‐4 (exenatide, Byetta) now commercially available. Preptin is a peptide that has been shown to increase insulin secretion in vitro and in vivo. Here, we describe the first chemical synthesis and analysis of a short series of preptin analogues based on the rat preptin sequence. Phe 21 in the preptin sequence was substituted with the non‐protein amino acids D‐Phe, D‐Hphe, 3‐aminobenzoic acid and 1‐aminocyclooctane‐1‐carboxylic acid, which rendered the preptin analogues resistant to chymotryptic protease hydrolysis at this position. Substitution of Phe 21 with these non‐protein amino acids did not abrogate the insulin secretory effect of preptin, with analogues showing a similar dose‐dependent effect on insulin secretion from βTC6‐F7 mouse β‐cells in both the presence and absence of glucose as unmodified rat preptin. Further studies on the stability of the preptin analogues and their effect on insulin secretion are in progress.
Unnatural amino acids increase sensitivity and provide for the design of highly selective caspase substrates
作者:M Poreba、P Kasperkiewicz、S J Snipas、D Fasci、G S Salvesen、M Drag
DOI:10.1038/cdd.2014.64
日期:2014.9
proteases - the human caspases. The power of this library for caspase discrimination extends far beyond traditional PS-SCL approach, as in addition to 19 natural amino acids we also used 110 diverse unnatural amino acids that can more extensively explore the chemical space represented by caspase-active sites. Using this approach we identified and employed peptide-based substrates that provided excellent
Design, Synthesis, and Screening of a Library of Peptidyl Bis(Boroxoles) as Oligosaccharide Receptors in Water: Identification of a Receptor for the Tumor Marker TF-Antigen Disaccharide
作者:Arnab Pal、Marie Bérubé、Dennis G. Hall
DOI:10.1002/anie.200906620
日期:2010.2.15
Mini lectins: A new class of oligosaccharidereceptors (see example) was designed by exploiting several modes of molecular recognition, including the unique ability of benzoboroxoles to complex hexopyranosides. The synthesis is modular, thus well suited to targeting specific oligosaccharides using combinatorial libraries.
Selective Substrates and Activity-Based Probes for Imaging of the Human Constitutive 20S Proteasome in Cells and Blood Samples
作者:Wioletta Rut、Marcin Poręba、Paulina Kasperkiewicz、Scott J. Snipas、Marcin Drąg
DOI:10.1021/acs.jmedchem.8b00026
日期:2018.6.28
the HyCoSuL approach, we designed and synthesized novel and selective fluorogenic substrates for each of these three constitutive 20S proteasome activities and applied them to assess inhibition of proteasome subunits by MG-132 and a clinically used inhibitor bortezomib. Our results confirm the utility of designed substrates in biochemical assays. Furthermore, selective peptide sequences obtained in this
[EN] FACTOR XIIA INHIBITORS<br/>[FR] INHIBITEURS DU FACTEUR XIIA
申请人:UNIV LEEDS INNOVATIONS LTD
公开号:WO2019186164A1
公开(公告)日:2019-10-03
This invention relates to compoundsof formula (I)and methods of treatment using the compounds. The invention also relates to processes and methods for producing the compounds of the invention. The compounds of the invention are modulators of Factor XII (e.g. Factor XIIa). In particular, the compounds are inhibitors of Factor XIIa and may be useful as anticoagulants.