- Spiegelmeric 4R/S-hydroxy/amino-L/D-prolyl collagen peptides: conformation and morphology of self-assembled structures
-
The primary structure of collagen, the major protein in connective tissue of mammals, comprises of repeating triads [(LPro-LHyp-Gly)n, P1, LHyp being 4R-hydroxy-lProline)] in a single strand that adopts left-handed polyproline II type helix. Three such single stranded helices wind around each another and held together by interchain H-bonds to form right-handed triple helix. This manuscript reports on collagen derived from its mirror image triad [(DPro-DHyp-Gly)n, P2, DHyp being 4S-hydroxy-DProline) and its 4-amino analogue (DPro-DAmp-Gly)n P4, DAmp being 4S-amino-DProline that form corresponding spiegelmeric triplexes. The amino L-collagen peptide (LPro-LAmp-Gly)n P3 and its D-analogue P4 show higher thermal stabilities compared to 4-hydroxy-lProline collagen peptides P1 and P2. The enantiomeric peptide pairs show mirror image CD profiles and identical thermal stability, with ionizable 4-amino group in P3 and P4 imparting pH dependent triplex stability. Upon cold mixing of the L- and D-collagen peptides, different morphological nanostructures arise from inter triplex peptide association. When the peptides are hot mixed (annealed), the inter peptide association occurs via interaction of single stranded peptide chains of opposite handedness leading to networked gel formation in P1 and P2, while the charged peptides P3 and P4 show more ordered nanofibers, different from the enantiomerically pure peptides. The nanocomposites of such chiral hybrid peptides may have not only interesting physicomorphology, but also biological properties that need exploration.
- Ganesh, Krishna N,More, Shahaji H
-
-
- An improved, scalable synthesis of bis-amino acids
-
trans-4-Hydroxy-L-proline derived bis-amino acids are chiral, cyclic building blocks that display two alpha-amino acids that are differentiated from each other with protecting groups. They are assembled into spiroligomers—rigid, shape-programmable spirocyclic oligomers that are both stereochemically and functionally diverse. The synthesis presented here focuses on recent improvements that allow for a convenient, large-scale synthesis of twelve stereochemically pure bis-amino acids from inexpensive trans-4-hydroxy-L-proline. The bis-amino acids differ in stereochemistry as well as the amine protecting group, one of which (para-nitrobenzyl carbamate) has not been previously incorporated into bis-amino acids.
- Cheong, Jae Eun,Pfeiffer, Conrad T.,Northrup, Justin D.,Parker, Matthew F.L.,Schafmeister, Christian E.
-
p. 4882 - 4884
(2016/10/24)
-
- COMPOUNDS
-
The present invention relates to novel compounds that inhibit Lp-PLA2 activity, processes for their preparation, to compositions containing them and to their use in the treatment of diseases associated with the activity of Lp-PLA2, for example Alzheimer's disease.
- -
-
Page/Page column 119; 120
(2016/02/12)
-
- Chemoselective synthesis of N-protected alkoxyprolines under specific solvation conditions
-
N-Protected hydroxyprolines (Hyp) were transformed chemoselectively into alkoxyproline derivatives by direct O-alkylation. The starting Hyp was transformed into the corresponding dianion in a mixture of dimethyl sulfoxide and tetrahydrofuran (1:16 v/v) as solvent. Under these conditions, the carboxy-anion showed reduced nucleophilicity because it was specifically solvated, and the more reactive oxy-anion was selectively alkylated. N-Protected trans-4-alkoxy-, cis-4-alkoxy- and trans-3-alkoxyprolines were thus obtained in a single step in very high overall yields and with complete stability of the stereogenic center configuration. Copyright
- Mihali, Voichita,Foschi, Francesca,Penso, Michele,Pozzi, Gianluca
-
supporting information
p. 5351 - 5355
(2014/10/15)
-
- Synthesis and evaluation of lysophosphatidylserine analogues as inducers of mast cell degranulation. Potent activities of lysophosphatidylthreonine and its 2-deoxy derivative
-
In response to various exogenous stimuli, mast cells (MCs) release a wide variety of inflammatory mediators stored in their cytoplasmic granules and this release initiates subsequent allergic reactions. Lysophosphatidylserine (lysoPS) has been known as an exogenous inducer to potentiate histamine release from MCs, though even at submicromolar concentrations. In this study, through SAR studies on lysoPS against MC degranulation, we identified lysoPT, a threonine-containing lysophospholipid and its 2-deoxy derivative as novel strong agonists. LysoPT and its 2-deoxy derivative induced histamine release from MCs both in vitro and in vivo at a concentration less than one-tenth that of lysoPS. Notably, lysoPT did not activate a recently proposed lysoPS receptor on MCs, GPR34, demonstrating the presence of another undefined receptor reactive to both lysoPS and lysoPT that is involved in MC degranulation. Thus, the present strong agonists, lysoPT and its 2-deoxy derivative, will be useful tools to understand the mechanisms of lysoPS-induced activation of degranulation of MCs. 2009 American Chemical Society.
- Iwashita, Masazumi,Makide, Kumiko,Nonomura, Taro,Misumi, Yoshimasa,Otani, Yuko,Ishida, Mayuko,Taguchi, Ryo,Tsujimoto, Masafumi,Aoki, Junken,Arai, Hiroyuki,Ohwada, Tomohiko
-
experimental part
p. 5837 - 5863
(2010/03/24)
-
- Prolinol-based nucleoside phosphonic acids: new isosteric conformationally flexible nucleotide analogues
-
trans-4-Hydroxy-l-proline has been used as a starting material for the synthesis of prolinol-based nucleotide analogues with an N-phosphonomethyl moiety attached to the prolinol ring nitrogen atom. The synthetic methodology based on the inversion of configuration at both 1- and 4-position led to all diastereoisomeric O-protected 4-mesyloxyprolinol-N-phosphonates. Alkylation of nucleobases using the synthons in the l-series afforded the nucleotide analogues corresponding to α-l- and β-l-nucleotide. The NMR-based conformational study of these compounds in aqueous solution performed at two different pH values, showing either N-fully protonated or deprotonated forms, revealed the occurrence of the same mostly populated conformer in both cases. All final l-prolinol-based nucleoside phosphonic acids were tested for cytotoxic and antiviral properties, but no significant activity was found.
- Vaněk, Václav,Budě?ínsky, Milo?,Rinnová, Markéta,Rosenberg, Ivan
-
experimental part
p. 862 - 876
(2009/05/09)
-
- AZA-BENZOFURANYL COMPOUNDS AND METHODS OF USE
-
The invention relates to azabenzofuranyl compounds of Formula (I) with anti-cancer and/or anti-inflammatory activity and more specifically to azabenzofuranyl compounds which inhibit MEK kinase activity. The invention provides compositions and methods useful for inhibiting abnormal cell growth or treating a hyperproliferative disorder, or treating an inflammatory disease in a mammal. The invention also relates to methods of using the compounds for in vitro, in situ, and in vivo diagnosis or treatment of mammalian cells, or associated pathological conditions.
- -
-
Page/Page column 126
(2008/06/13)
-
- The synthesis of curved and linear structures from a minimal set of monomers
-
Spiro-ladder oligomers of designed shape were assembled from a set of two enantiomeric bis-amino acid monomers. Two tetramers of differing monomer sequence were synthesized to study the effect of monomer stereochemistry upon macromolecular shape. Two-dime
- Levins, Christopher G.,Schafmeister, Christian E.
-
p. 9002 - 9008
(2007/10/03)
-
- 4.5-diaryloxazole compounds with prostaglandin I2 (PGI2) agonistic activity
-
Heterocyclic compounds of formula (I), wherein R1is carboxy or protected carboxy, R2is aryl which may have suitable sustituent(s), R3is aryl which may have suitable substituent(s), R4is hydrogen, lower alkyl, hy
- -
-
Page column 8
(2010/02/05)
-
- Aromatic amidine derivatives useful as selective thrombin inhibitors
-
The present invention relates to a novel thrombin inhibitor which is effective even when orally administered. More specifically, the present invention relates to an aromatic amidine derivative represented by formula (I) and the salts thereof, which show potent selective inhibitory activity for thrombin in which (a), R, R1, R2, R3, A, W, Y and n are defined as described in the specification.
- -
-
-
- Nucleosides and Oligonucleotides Derived from trans-4-Hydroxy-N-acetylprolinol
-
The 4-O-phosphoramidites of monomethoxytritylated 4-hydroxy-N-6-benzoyladenin-9-yl)acetyl>prolinol and 4-hydroxy-N-prolinol were prepared for incorporation into nucleic acids.The L-trans all-adenine oligonucleotide (ON) hybridises to natural oligothymidylate, apparently via triplex formation.All-purine sequences of the L-trans form can also form homo-complexes with their pyrimidine counterpart.The D-trans compounds give larger destabilisation when inserted in DNA.D-trans all-adenine ONs do not form complexes with natural oligothymidylate.For this series of modified ONs no hybridisation could be detected between complementary strands of opposite enantiomeric form.
- Ceulemans, G.,Aerschot, A. Van,Herdewijn, P.
-
p. S234 - S237
(2007/10/03)
-
- PYRROLIDINYL DI-CARBOXYLIC ACID DERIVATIVES AS METABOTROPIC GLUTAMATE RECEPTOR AGONISTS
-
The present invention provides novel compounds that affect certain excitatory amino acid receptors, and are useful in the treatment of neurological disorders and psychiatric disorders.
- -
-
-
- Synthesis of conformationally constrained DTPA analogues. Incorporation of the ethylenediamine units as aminopyrrolidines
-
The synthesis of conformationally constrained diethylenetriaminepentaacetic acid (DTPA) analogues is an effort to probe the relationship between ligand structure and metal complex stability. In the pursuit of this objective, diastereomerically and enantiomerically pure mono- and bis-pyrrolidine analogues of DTPA have been prepared from trans-4-hydroxy-L-proline. The mono-pyrrolidine chelator 1 was constructed from a single hydroxyproline unit and an ethylenediamine moiety while two hydroxyproline-derived fragments 4e or 14b and 9b were coupled by N-alkylation of a triflate to afford the core bis-pyrrolidine structures: optically active 10 and meso-15. Deprotection of the triamine pentaesters 12 and 17 afforded the triamine pentaacetic acids 2 and 3 as their hydrochloride salts. The stereochemical homogeneity of precursor esters 12 and 17 was determined by HPLC using authentic epimeric standards to establish that essentially no racemization of the original amino acid α-center had occurred. Some loss of stereochemical homogeniety was encountered in the synthesis of 10 and 15 by N-alkylation of aminoproline 9b with a hydroxyproline-derived triflate, which had proceeded with some retention of configuration. The diastereomeric impurities were removed by crystallization of the respective benzyl carbamates. Bis-pyrrolidine pentaacids 2 and 3 formed isolable chelates with gadolinium and lutetium. A comparision of the lutetium chelates of 2 and 3 by NMR revealed significant differences which were reflective of a rigid structure with 2, while metal complexation with 3 was structurally less defined.
- Williams,Rapoport
-
p. 3616 - 3625
(2007/10/02)
-
- PREPARATION OF (1R,4R)-1-METHYL-2-(p-TOLUENESULFONYL)-5-PHENYLMETHYL-2,5-DIAZABICYCLOHEPTANE, INTERMEDIATE IN A SYNTHESIS OF NEW NAPHTHYRIDONES
-
An efficient chiral synthesis of the (1R,4R)-1-methyl-2-(p-toluenesulfonyl)-5-phenylmethyl-2,5-diazabicycloheptane (2b) was performed using trans-4-hydroxy-L-proline as starting material.This bridged piperazine was used in the preparation of new na
- Remuzon, Philippe,Massoudi, Massoud,Bouzard, Daniel,Jacquet, Jean-Pierre
-
p. 679 - 684
(2007/10/02)
-
- Conformationally Defined Neurotransmitter Analogues. Selective Inhibition of Glutamate Uptake by One Pyrrolidine-2,4-dicarboxylate Diastereomer
-
In order to determine the conformational requirements for binding of L-glutamate to the proteins involved in the process of neurotransmission, rigid analogues containing an embedded glutamate moiety have been prepared.These "conformer mimics", the pyrrolidine-2,4-dicarboxylates 4, 7, 11, and 14, were synthesized from commercially available trans-4-hydroxy-L-proline and cis-4-hydroxy-D-proline, and then were tested for their ability to inhibit the high-affinity transport of -L-glutamate into synaptosomes and to block the binding of radioligands to the NMDA (N-methyl-D-aspartate), KA (kainate), and QA (quisqualate) glutamate neurotransmitter receptor sites.While none of the four analogues binds effectively to the excitatory receptors, the L-trans-isomer 7 is a potent and selective competitive inhibitor of L-glutamate transport.These results delineate a specific structural/conformational preference for binding to the uptake system that is distinct from that required for binding to the NMDA, KA, and QA receptors.
- Bridges, Richard J.,Stanley, Mark S.,Anderson, Michael W.,Cotman, Carl W.,Chamberlin, A. Richard
-
p. 717 - 725
(2007/10/02)
-