Sureshbabu, Vommina V.; Chennakrishnareddy, Gundala, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2009, vol. 48, # 7, p. 981 - 988
Synthesis and biological activity of nociceptin/orphanin FQ analogues substituted in position 7 or 11 with Cα,α-dialkylated amino acids
摘要:
Previous structure-activity and NMR studies on nociceptin/orphanin FQ (N/OFQ) demonstrated that Aib substitution of Ala(7) and/or Ala(11) increases the peptide potency through an alpha helix structure induction mechanism. On these bases we synthesised and evaluated pharmacologically in the mouse vas deferens assay a series of N/OFQ-NH2 analogues substituted in position 7 and 11 with C alpha,alpha-disubstituted cyclic, linear and branched amino acids. None of the 20 novel N/OFQ analogues produced better results than [Aib(7)]N/OFQ-NH2. Thus, this substitution was combined with other chemical modifications known to modulate peptide potency and/or efficacy generating compound 21 [Nphe(1)Aib(7) Arg(14) Lys(15)] N/OFQ-NH2 (coded as UFP- 111), compound 22 [(pF)Phe(4) Aib(7) Arg(14) Lys(15)] N/OFQ-NH2 (UFP-112) and compound 23 [Phe psi(CH2-NH)Gly(2) (pF)Phe(4)Aib(7)Arg(14)Lys(15)]N/OFQ-NH2 (UFP- 113). These novel peptides behaved as highly potent NOP receptor ligands showing full (UFP- 112) and partial (UFP- 113) agonist and pure antagonist (UFP- 111) activities in a series of in vitro functional assays performed on pharmacological preparations expressing native as well as recombinant NOP receptors. (c) 2007 Elsevier Ltd. All rights reserved.
Babu, Vommina V. Suresh; Ananda, Kuppanna, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2001, vol. 40, # 1, p. 70 - 74
作者:Babu, Vommina V. Suresh、Ananda, Kuppanna
DOI:——
日期:——
Anthranilimide-based glycogen phosphorylase inhibitors for the treatment of type 2 diabetes: 1. Identification of 1-amino-1-cycloalkyl carboxylic acid headgroups
作者:Steven M. Sparks、Pierette Banker、David M. Bickett、H. Luke Carter、Daphne C. Clancy、Scott H. Dickerson、Kate A. Dwornik、Dulce M. Garrido、Pamela L. Golden、Robert T. Nolte、Andrew J. Peat、Lauren R. Sheckler、Francis X. Tavares、Stephen A. Thomson、Liping Wang、James E. Weiel
DOI:10.1016/j.bmcl.2008.11.085
日期:2009.2
Optimization of the amino acid residue within a series of anthranilimide-based glycogen phosphorylase inhibitors is described. These studies culminated in the identification of anthranilimides 16 and 22 which displayed potent in vitro inhibition of GPa in addition to reduced inhibition of CYP2C9 and excellent pharmacokinetic properties. (C) 2008 Elsevier Ltd. All rights reserved.
Peptaibolin analogues by incorporation of α,α-dialkylglycines: synthesis and study of their membrane permeating ability
作者:Vânia I.B. Castro、Carina M. Carvalho、Rui D.V. Fernandes、Sílvia M.M.A. Pereira-Lima、Elisabete M.S. Castanheira、Susana P.G. Costa
DOI:10.1016/j.tet.2015.12.079
日期:2016.2
Analogues of Peptaibolin, a peptaibol with antibiotic activity, incorporating alpha,alpha-dialkylglycines (Deg, Dpg, and Ac(6)c) at selected positions were synthesised by MW-SPPS and fully characterized. A control analogue incorporating L-alanine was also prepared. The native peptide and the analogues were studied by fluorescence spectroscopy for their membrane permeating activity. Small unilamellar vesicles (SUVs) of egg phosphatidylcholine/cholesterol (70:30) containing an encapsulated fluorescence probe (6-carboxyfluorescein) were used as membrane models. The assays of carboxyfluorescein release from SUVs upon peptide addition showed that Peptaibolin-Dpg and Peptaibolin-Ac(6)c are the most active peptides. These results indicate that the structure of the alpha,alpha-diallcylglycines is crucial for the membrane permeating ability of these Peptaibolin analogues. (C) 2016 Elsevier Ltd. All rights reserved.
Thermodynamic and Structural Impact of α,α-Dialkylated Residue Incorporation in a β-Hairpin Peptide
作者:Megan A. Karnes、Shelby L. Schettler、Halina M. Werner、Alana F. Kurz、W. Seth Horne、George A. Lengyel
DOI:10.1021/acs.orglett.6b01936
日期:2016.8.5
Peptides containing alpha,alpha-dialkylated alpha-amino acids, owing to their ability to disrupt aggregation of beta-amyloid proteins, have therapeutic potential in the treatment of neurodegenerative diseases. Thermodynamic and structural analyses are reported for a series of beta-hairpin peptides containing alpha,alpha-dialkylated alpha-amino acids with varying side chain lengths. The results of these experiments show that alpha,alpha-dialkylated alpha-amino acids with side-chain lengths longer than one carbon unit are tolerated in a beta-hairpin, although at a moderate cost to folded stability.
Facile Synthesis of α,α-Diisobutylglycine and Anchoring Its Derivatives onto PAL-PEG-PS Resin
作者:Yanwen Fu、Marcus A. Etienne、Robert P. Hammer
DOI:10.1021/jo034885j
日期:2003.12.1
alpha,alpha-Diisobutylglycine has been synthesized using a Pd-mediated dialkylation of ethyl nitroacetate as a key first step. The free alphaalphaAA is N-alpha-protected and has been applied to the assembly of conformationally constrained peptide analogues. Mixed anhydrides from BOP-Cl and Fmoc-alphaalphaAA-OH are used for anchoring alphaalphaAAs onto a trialkoxybenzyl linker on PEG-PS grafted support, upon which a beta-strand mimic with difficult sequence is assembled in a superior quality.