Antibody Recognition of Chiral Surfaces. Enantiomorphous Crystals of Leucine-Leucine-Tyrosine
摘要:
Monoclonal antibodies were selected after immunization with crystals of the tripeptide L-leucine-L-leucine-L-tyrosine. They interact with the tripeptide crystals, but do not interact with the tripeptide molecule, with other crystalline surfaces, or with adsorbed protein. The interactions of two antibodies with crystals of L-Leu-L-Leu-L-Tyr and of its enantiomer D-LeU-D-Leu-D-Tyr were characterized in depth. Antibody 48E is stereoselective and enantioselective: it recognizes only the {0(1) over bar 1} faces of the L-Leu-L-Leu-L-Tyr crystals, and not the enantiomorphous {01(1) over bar} faces of D-Leu-D-Leu-D-Tyr crystals, or any other faces of either crystal. In contrast antibody 602E is poorly stereoselectiwe and is not enantioselective: it recognizes the crystals of both enantiomers, interacting With a number of different faces of each. The different recognition patterns are explained on the basis of the nature of the interactions and the structure of the interacting surfaces. Understanding this antibody specificity advances our general understanding of surface recognition and transfer of chiral information across biological interfaces.
Design and Synthesis of Gramicidin S Analogs with High Antibiotic Activity
作者:Kazuki Sato、Yoko Yamaguchi、Ukon Nagai
DOI:10.1246/bcsj.20120166
日期:2013.1.15
Based on the β-turn preference of tetrapeptide sequences as analyzed by CD spectra of their chromophoric derivatives, 10 analogs of gramicidinS (GS) were designed and synthesized with general form...
基于四肽序列的 β-转角偏好(通过其发色衍生物的 CD 光谱分析),设计并合成了 10 种短杆菌肽 S (GS) 类似物,具有一般形式...
Antifungal dipeptides incorporating an inhibitor of homoserine dehydrogenase
作者:Andrzej S. Skwarecki、Marta Schielmann、Dorota Martynow、Marcin Kawczyński、Aleksandra Wiśniewska、Maria J. Milewska、Sławomir Milewski
DOI:10.1002/psc.3060
日期:2018.1
The antifungal activity of 5‐hydroxy‐4‐oxo‐l‐norvaline (HONV), exhibited under conditions mimicking human serum, may be improved upon incorporation of this amino acid into a dipeptide structure. Several HONV‐containing dipeptides inhibited growth of human pathogenic yeasts of the Candida genus in the RPMI‐1640 medium, with minimal inhibitory concentration values in the 32 to 64 μg mL−1 range. This
Aminoacyl prodrug derivatives and medicaments for treatment of thromboembolic disorders
申请人:Lerchen Hans-Georg
公开号:US20100292230A1
公开(公告)日:2010-11-18
The present application relates to prodrug derivatives of 5-chloro-N-((5S)-2-oxo-3-[4-(3-oxomorpholin-4-yl)phenyl]-1,3-oxazolidin-5-yl}methyl)thiophene-2-carboxamide, processes for their preparation, their use for the treatment and/or prophylaxis of diseases, and their use for the manufacture of medicaments for the treatment and/or prophylaxis of diseases, especially of thromboembolic disorders.
The total synthesis of surfactin B2, a cyclic depsipeptide isolated from Bacillus natto KMD 2311, was achieved to elucidate the absolute configuration of its fatty acid moiety. This is the first chemical confirmation of the absolute configuration of a surfactin homolog. Two possible diastereoisomers of surfactin B2, cyclo[D- and L-3-(Glu-Leu-D-Leu-Val-Asp-D-Leu-Leu-O)-n-tetradecanoyl] (1a and b), were synthesized by a solution method using mainly active ester and azide fragment condensation methods. Cyclization reaction of the partially protected linear depsipeptide containing the C-terminal N-succinimidyl active ester in pyridine by the high dilution method at room temperature for 3d gave the desired cyclic depsipeptide in a high yield of about 70%. The synthetic product 1a, containing the D-isomer of 3-hydroxytetradecanoic acid as a fatty acid moiety, was identical with natural surfactin B2.
Synthesis of new hydrophilic rhodamine based enzymatic substrates compatible with droplet-based microfluidic assays
作者:Johan Fenneteau、Dany Chauvin、Andrew D. Griffiths、Clément Nizak、Janine Cossy
DOI:10.1039/c7cc01506b
日期:——
Here we report the conception, synthesis and evaluation of new hydrophilic rhodamine-based enzymaticsubstrates for detection of peptidase activity compatible with high-throughput screening using droplet-based microfluidics.