Synthesis of new chiral PNAs bearing a dipeptide-mimic monomer with two lysine-derived stereogenic centres
摘要:
The synthesis of new chiral PNA analogues based on lysine is reported. In particular, L- and/or D-lysine-based PNA submonomers bearing two lysine side chains exactly spaced as in the dipeptide Lys-Lys were synthesized and incorporated in the middle of decameric PNA strands, obtaining four diastereomeric (LD, DL, LL and DD) lysine-based chiral PNAs. The hybridization with their complementary antiparallel DNA strand was studied by melting temperature determination and compared with the analogue achiral PNA and chiral PNAs bearing one residue with either of the two lysine enantiomers. The binding abilities were shown to be strongly dependent on the configuration of the stereogenic centres. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of new chiral PNAs bearing a dipeptide-mimic monomer with two lysine-derived stereogenic centres
摘要:
The synthesis of new chiral PNA analogues based on lysine is reported. In particular, L- and/or D-lysine-based PNA submonomers bearing two lysine side chains exactly spaced as in the dipeptide Lys-Lys were synthesized and incorporated in the middle of decameric PNA strands, obtaining four diastereomeric (LD, DL, LL and DD) lysine-based chiral PNAs. The hybridization with their complementary antiparallel DNA strand was studied by melting temperature determination and compared with the analogue achiral PNA and chiral PNAs bearing one residue with either of the two lysine enantiomers. The binding abilities were shown to be strongly dependent on the configuration of the stereogenic centres. (c) 2005 Elsevier Ltd. All rights reserved.
paper, the synthesis of a short modified peptidenucleicacid (PNA), obtained by using several different L-amino acids as synthons, is shown. The synthesis was performed by a submonomeric strategy, obtaining a model trimeric PNA containing embedded amino acid derived side chains in its backbone that mimic the peptidesequence PKKKRKV, which is a nuclearlocalization signal (NLS) widely used for translocating
Design and Synthesis of Activity-Based Probes and Inhibitors for Bleomycin Hydrolase
作者:Wouter A. van der Linden、Ehud Segal、Matthew A. Child、Anna Byzia、Marcin Drąg、Matthew Bogyo
DOI:10.1016/j.chembiol.2015.07.010
日期:2015.8
Bleomycin hydrolase (BLMH) is a neutral cysteine aminopeptidase that has been ascribed roles in many physiological and pathological processes, yet its primary biological function remains enigmatic. In this work, we describe the results of screening of a library of fluorogenic substrates to identify non-natural amino acids that are optimally recognized by BLMH. This screen identified several substrates with k(cat)/K-M values that are substantially improved over the previously reported fluorogenic substrates for this enzyme. The substrate sequences were used to design activity-based probes that showed potent labeling of recombinant BLMH as well as endogenously expressed BLMH in cell extracts, and in intact cells. Importantly, we identify potent BLMH inhibitors that are able to fully inhibit endogenous BLMH activity in intact cells. These probes and inhibitors will be valuable new reagents to study BLMH function in cellular and animal models of human diseases where BLMH is likely to be involved.