Controlled Polymerization of N-Substituted Glycine N-Thiocarboxyanhydrides Initiated by Rare Earth Borohydrides toward Hydrophilic and Hydrophobic Polypeptoids
摘要:
N-substituted glycine N-thiocarboxyanhydrides (NTAs) are alternative monomers to prepare polypeptoids with large-scale producing potential compared to the corresponding N-carboxyanhydrides (NCAs) due to their easily synthetic approach and stability during purification and storage. Novel monomer N-butylglycine NTA (NBG-NTA) has been synthesized and well characterized for the first time. Rare earth borohydrides [RE(BH4)(3)(THF)(3), RE = Sc, Y, La, Nd, Dy, and Lit] have been first applied in the polymerization of sarcosine NTA (Sar-NTA) and NBG-NTA to achieve high molecular weight (MW) hydrophilic and hydrophobic polypeptoids. Polysarcosines (PSars), poly(N-butylglycine)s (PNBGs), and their copolymers with high yields, high MWs, and moderate MW distributions are synthesized at 60 degrees by using RE(BH4)(3)(THF)(3) initiators. MWs of polypeptoids are controlled by feed molar ratios. For instance, PSar with an absolute M-n, of 27.7 kDa (DP = 390) and PDI of 1.14 is produced successfully from Sar-NTA. Thermoresponsive random copolypeptoids poly(sarcosine-r-N-butylglycine)s [P(Sar-r-NBG)s] have reversible phase transitions (cloud point temperature) in aqueous solution and minimal cytotoxicity comparable to PEG and PSar, which is promising in various biomedical and biotechnological applications. Thermal properties of homo- and co-polypeptoids are investigated by TGA and DSC measurements.
Rich spectroscopic and molecular dynamic studies on the interaction of cytotoxic Pt(II) and Pd(II) complexes of glycine derivatives with calf thymus DNA
摘要:
Some amino acid derivatives, such as R-glycine, have been synthesized together with their full spectroscopic characterization. The sodium salts of these bidentate amino acid ligands have been interacted with [M(bpy)(H2O)(2)](NO3)(2) giving the corresponding some new complexes with formula [M(bpy)(R-gly)]NO3 (where M is Pt(II) or Pd(II), bpy is 2,2-bipyridine and R-gly is butyl-, hexyl- and octyl-glycine). Due to less solubility of octyl derivatives, the biological activities of butyl and hexyl derivatives have been tested against chronic myelogenous leukemia cell line, K562. The interaction of these complexes with highly polymerized calf thymus DNA has been extensively studied by means of electronic absorption, fluorescence and other measurements. The experimental results suggest that these complexes positive cooperatively bind to DNA presumably via groove binding. Molecular dynamic results show that the DNA structure is largely maintained its native structure in hexylglycine derivative-water mixtures and at lower temperatures. The simulation data indicates that the more destabilizing effect of butylglycine is induced by preferential accumulation of these molecules around the DNA and due to their more negative free energy of binding via groove binding.
METHOD FOR SYNTHESIZING PEPTIDES IN CELL-FREE TRANSLATION SYSTEM
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:US20200040372A1
公开(公告)日:2020-02-06
An objective of the present invention is to provide methods of synthesizing peptides containing structurally diverse amino acids using cell-free translation systems, which can accomplish excellent translational efficiency as compared to conventional techniques (the conventional techniques being methods which involve preparing aminoacyl-tRNAs which do not have protecting groups outside the translation systems without using ARS, and then adding the prepared aminoacyl-tRNAs into translation systems). In the present invention, it was found that amino acid-containing peptides can be synthesized efficiently by protecting an amino acid linked to tRNA with an appropriate protecting group, and then performing the step of deprotecting the protecting group of the amino acid linked to tRNA and the step of peptide translation from a template nucleic acid in a cell-free translation system in parallel.
Synthesis of new liophilic functionalized aminomethylphosphine oxides and their acid-base and membrane-transport properties toward acidic substrates
作者:R. A. Cherkasov、A. R. Garifzyanov、A. S. Talan、R. R. Davletshin、N. V. Kurnosova
DOI:10.1134/s1070363209090114
日期:2009.9
A large number of new lipophilic mono- and bisphosphinylamines including those possessing additional potential centers of coordination was synthesized on the basis of the Kabachnik-Fields reaction, and acid-base and membrane transport properties of the synthesized compounds toward the mono- and polybasic carboxylic acids were studied. By their basicity all the synthesized aminophosphine oxides were
在Kabachnik-Fields反应的基础上,合成了许多新的亲脂性单膦酸和双膦胺,包括具有额外潜在配位中心的那些,以及合成的化合物对一元和多元羧酸的酸碱和膜传输特性被研究了。由于它们的碱性,所有合成的氨基膦氧化物均显示出劣于其脂族胺前体。第二次膦基的引入极大地降低了碱性,以致于不可能通过电位法确定p K a。讨论了氨基次膦酰基载体与底物的结构与酸性底物的膜运输效率之间的相互关系。
A Mild and Efficient Method for the One-Pot Monocarboxymethylation of Primary Amines
A mild and efficient method for the monocarboxymethylation of primary amines that takes place under aqueous conditions at room temperature is described. Treatment of an aqueous solution of a variety of primary amines with two equivalents of glyoxylic acid leads to the N-formyl glycine derivatives. Direct hydrolysis of the crude reaction solution leads to the products of amine monocarboxymethylation in good to excellent yield.
Cyclic Poly(α-peptoid)s and Their Block Copolymers from N-Heterocyclic Carbene-Mediated Ring-Opening Polymerizations of N-Substituted <i>N</i>-Carboxylanhydrides
作者:Li Guo、Donghui Zhang
DOI:10.1021/ja907380d
日期:2009.12.23
sequential monomer addition. The cyclicpolymer architectures were verified by MALDI-TOF mass spectrometry and intrinsic viscosity measurements. Mark-Houwink-Sakurada plot analyses revealed that cyclic poly(alpha-peptoid)s prepared from NHC-mediated polymerizations exhibit lower intrinsic viscosities than their linear analogues prepared from primary amine-initiated polymerizations. The ratio of their intrinsic
[EN] META-GUANIDINE, UREA, THIOUREA OR AZACYCLIC AMINO BENZOIC ACID DERIVATIVES AS INTEGRIN ANTAGONISTS<br/>[FR] DERIVES DE LA META-GUANIDINE, DE L'UREE, DE LA THIO-UREE OU DE L'ACIDE AMINOBENZOIQUE AZACYCLIQUE UTILISES COMME ANTAGONISTES DE L'INTEGRINE
申请人:G.D. SEARLE & CO.
公开号:WO1997008145A1
公开(公告)日:1997-03-06
(EN) The present invention relates to a class of compounds represented by formula (I) or a pharmaceutically acceptable salt thereof, wherein A is (a) or (b) or (c) or (d) pharmaceutical compositions thereof and methods of using such compounds and compositions as $g(a)v$g(b)3 integrin antagonists.(FR) L'invention concerne une classe de composés représentés par la formule I et leurs sels acceptables sur le plan pharmaceutique. Dans cette formule, A est (a) ou (b) ou (c) ou (d). L'invention concerne également des préparations pharmaceutiques contenant ces composés, ainsi que des procédés d'utilisation de ces composés et de ces préparations comme antagonistes de l'intégrine $g(a)v$g(b)3.