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Breistein P, Johansson J, Ibrahem I, Lin S, Deiana L, Sun J, Cordova A. One-Step Catalytic Enantioselective α-Quaternary 5-Hydroxyproline Synthesis: An Asymmetric Entry to Highly Functionalized α-Quaternary Proline Derivatives. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100911] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Oliveira VX, Fázio MA, Silva AF, Campana PT, Pesquero JB, Santos EL, Costa-Neto CM, Miranda A. Biological and conformational evaluation of angiotensin II lactam bridge containing analogues. ACTA ACUST UNITED AC 2011; 172:1-7. [PMID: 21787808 DOI: 10.1016/j.regpep.2011.05.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2010] [Revised: 03/28/2011] [Accepted: 05/30/2011] [Indexed: 11/25/2022]
Abstract
Angiotensin II (AII) is the active octapeptide product of the renin enzymatic cascade, which is responsible for sustaining blood pressure. In an attempt to establish the AII-receptor-bound conformation of this octapeptide, we designed conformationally constrained analogues by scanning the entire AII sequence with an i-(i+2) and i-(i+3) lactam bridge consisting of an Asp-(Xaa)(n)-Lys scaffold. Most analogues presented low agonistic activity when compared to AII in the different bioassays tested. The exceptions are cyclo(0-1a) [Asp(0), endo-(Lys(1a))]-AII (1) and [Asp(0), endo-(Lys(1a))]-AII (2), both of which showed activity similar to AII. Based on peptide 1 and the analogue cyclo(3-5)[Sar(1), Asp(3), Lys(5)]-AII characterized by Matsoukas et al., we analyzed the agonistic and antagonistic activities, respectively, through a new monocyclic peptide series synthesized by using the following combinations of residues as bridgehead elements for the lactam bond formation: D- or L-Asp combined with D- or L-Lys or L-Glu combined with L-Orn. Six analogues showed an approximately 20% increase in biological activity when compared with peptide (1) and were equipotent to AII. In contrast, six analogues presented antagonistic activity. These results suggest that the position of the lactam bridge is more important than the bridge length or chirality for recognition of and binding to the angiotensin II AT1-receptor.
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Affiliation(s)
- Vani X Oliveira
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP 09210-170, Brazil.
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Le Quement ST, Petersen R, Meldal M, Nielsen TE. N-acyliminium intermediates in solid-phase synthesis. Biopolymers 2010; 94:242-56. [PMID: 20225296 DOI: 10.1002/bip.21358] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
N-Acyliminium ions are powerful intermediates in synthetic organic chemistry. Examples of their use are numerous in solution-phase synthesis, but there are unmerited few reports on these highly reactive electrophiles in solid-phase synthesis. The present review covers the literature to date and illustrates the methods used to generate N-acyliminium intermediates on solid support and their further elaboration to a range of pharmacologically interesting peptidomimetics, heterocycles, and other small molecules.
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Affiliation(s)
- Sebastian T Le Quement
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 201, DK-2800 Kgs. Lyngby, Denmark
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Yu SM, Hong WX, Wu Y, Zhong CL, Yao ZJ. Total Synthesis of Chloptosin, a Potent Apoptosis-Inducing Cyclopeptide. Org Lett 2010; 12:1124-7. [DOI: 10.1021/ol100135a] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shun-Ming Yu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Wen-Xu Hong
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Yuan Wu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Chun-Long Zhong
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Zhu-Jun Yao
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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Rosenström U, Sköld C, Lindeberg G, Botros M, Nyberg F, Hallberg A, Karlén A. Synthesis and AT2 receptor-binding properties of angiotensin II analogues. ACTA ACUST UNITED AC 2004; 64:194-201. [PMID: 15485557 DOI: 10.1111/j.1399-3011.2004.00184.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The present study investigates the importance of the amino acid side chains in the octapeptide angiotensin II (Ang II) for binding to the AT2 receptor. A Gly scan was performed where each amino acid in Ang II was substituted one-by-one with glycine. The resulting set of peptides was tested for affinity to the AT2 receptor (porcine myometrial membranes). For a comparison, the peptides were also tested for affinity to the AT1 receptor (rat liver membranes). Only the substitution of Arg2 reduced affinity to the AT2 receptor considerably (92-fold when compared with Ang II). For the other Gly-substituted analogues the affinity to the AT2 receptor was only moderately affected. To further investigate the role of the Arg2 side chain for receptor binding, we synthesized some N-terminally modified Ang II analogues. According to these studies a positive charge in the N-terminal end of angiotensin III [Ang II (2-8)] is not required for high AT2 receptor affinity but seems to be more important in Ang II. With respect to the AT1 receptor, [Gly2]Ang II and [Gly8]Ang II lacked binding affinity (Ki > 10 microM). Replacement of the Val3 or Ile5 residues with Gly produced only a slight decrease in affinity. Interestingly, substitution of Tyr4 or His6, which are known to be very important for AT1 receptor binding, resulted in only 48 and 14 times reduction in affinity, respectively.
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Affiliation(s)
- U Rosenström
- Department of Medicinal Chemistry, Division of Organic Pharmaceutical Chemistry, Uppsala University, SE-751 23 Uppsala, Sweden
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Facile and rapid regeneration of free amino acids from N -benzyloxycarbonyl-5-oxazolidinones and from N -benzyloxycarbonylamino derivatives by treatment with BCl 3 in dichloromethane. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lindman S, Lindeberg G, Frändberg PA, Nyberg F, Karlén A, Hallberg A. Effect of 3-5 monocyclizations of angiotensin II and 4-aminoPhe6-Ang II on AT2 receptor affinity. Bioorg Med Chem 2003; 11:2947-54. [PMID: 12788364 DOI: 10.1016/s0968-0896(03)00212-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The endogenous angiotensin II (Ang II) and the synthetic AT(2) selective agonist 4-aminoPhe(6)-Ang II respond very differently to identical cyclizations. Cyclizations of Ang II by thioacetalization, involving the 3 and 5 amino acid residue side chains, provided ligands with almost equipotent binding affinities to Ang II at the AT(2) receptor. In contrast, the same cyclization procedures applied on the AT(2) selective 4-aminoPhe(6)-Ang II delivered significantly less potent AT(2) receptor ligands, although the AT(2)/AT(1) selectivity was still very high. The fact that different structure-activity relationships are observed after imposing conformational restrictions on Ang II and 4-aminoPhe(6)-Ang II, respectively, suggests that the peptides, despite large similarities might adopt quite different backbone conformations when binding to the AT(2) receptor.
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Affiliation(s)
- Susanna Lindman
- Department of Organic Pharmaceutical Chemistry, Uppsala Biomedical Centre, Uppsala University, Box 574, SE-751 23 Uppsala, Sweden
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Tantry SJ, Kantharaju, Suresh Babu VV. Microwave accelerated efficient synthesis of N-fluorenylmethoxycarbonyl/t-butoxycarbonyl/benzyloxycarbonyl-5-oxazolidinones. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)02257-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Allevi P, Cighetti G, Anastasia M. Cleavage of benzyloxycarbonyl-5-oxazolidinones to α-benzyloxycarbonylamino-α-alkyl esters by alcohols and sodium hydrogen carbonate. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00971-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lindman S, Lindeberg G, Gogoll A, Nyberg F, Karlén A, Hallberg A. Synthesis, receptor binding affinities and conformational properties of cyclic methylenedithioether analogues of angiotensin II. Bioorg Med Chem 2001; 9:763-72. [PMID: 11310611 DOI: 10.1016/s0968-0896(00)00294-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Cyclic 12-, 13- and 14-membered ring angiotensin II analogues related to disulfides but encompassing methylene-dithioether bridges have been prepared. The affinity data from these derivatives were compared to those from the disulfides. The methylenedithioether analogues displayed good binding affinities to rat liver AT1 receptors although in most cases somewhat lower than their disulfide counterparts. One of the methylenedithioethers with a 13-membered ring system demonstrated the highest binding affinity among the thioethers. Theoretical conformational analysis of model compounds of the two series were performed suggesting a similarity between the disulfide and the corresponding methylenedithioether analogues and also between the ring size homologues. This analysis also suggested that some of the model compounds were prone to adopt inverse gamma-turn conformations, which was further supported by use of NMR spectroscopy of the 12-membered ring analogue in the series. The easily executed methylenedithioether cyclization should constitute a valuable complement to the common disulfide methodology for fine-tuning and for probing the bioactive conformation of peptides.
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Affiliation(s)
- S Lindman
- Department of Organic Pharmaceutical Chemistry, Uppsala Biomedical Centre, Uppsala University, Sweden
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Lindman S, Lindeberg G, Nyberg F, Karlén A, Hallberg A. Comparison of three gamma-turn mimetic scaffolds incorporated into angiotensin II. Bioorg Med Chem 2000; 8:2375-83. [PMID: 11026551 DOI: 10.1016/s0968-0896(00)00169-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rigidification of peptides by cyclization and iterative incorporation of well-defined secondary structure mimetics constitutes one approach to the design of non-peptidergic structures with better defined conformations. We herein present the synthesis of a potential gamma-turn mimetic scaffold, and its incorporation in the 3-5 position of angiotensin II. Two analogues of angiotensin II (Ang II) incorporating this 1,3,5-trisubstituted benzene gamma-turn scaffold were synthesized. Evaluation of the compounds in a radioligand binding assay showed that they lacked affinity to the AT1 receptor. To rationalize these results a geometrical and electrostatical comparison with Ang II analogues encompassing a bicyclic scaffold that delivered inactive pseudo peptides and an azepine scaffold producing highly active ligands was made. This analysis did not provide a clear rationale for the inactivity of the benzene gamma-turn scaffolds.
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Affiliation(s)
- S Lindman
- Department of Organic Pharmaceutical Chemistry, Uppsala Biomedical Centre, Uppsala University, Sweden
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