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Liu MC, Chen CY, Chiang CH, Wang WM, Cheng RP. Effect of lysine methylation and acetylation on the RNA recognition and cellular uptake of Tat-derived peptides. Bioorg Med Chem 2016; 24:5047-5051. [DOI: 10.1016/j.bmc.2016.08.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 08/09/2016] [Accepted: 08/11/2016] [Indexed: 11/25/2022]
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Ohata J, Minus MB, Abernathy ME, Ball ZT. Histidine-Directed Arylation/Alkenylation of Backbone N–H Bonds Mediated by Copper(II). J Am Chem Soc 2016; 138:7472-5. [DOI: 10.1021/jacs.6b03390] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jun Ohata
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Matthew B. Minus
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Morgan E. Abernathy
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Zachary T. Ball
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
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Recent Advances in Application of Amino Acids: Key Building Blocks in Design and Syntheses of Heterocyclic Compounds. ADVANCES IN HETEROCYCLIC CHEMISTRY 2015. [DOI: 10.1016/bs.aihch.2015.02.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Cescato R, Erchegyi J, Waser B, Piccand V, Maecke HR, Rivier JE, Reubi JC. Design and in vitro characterization of highly sst2-selective somatostatin antagonists suitable for radiotargeting. J Med Chem 2008; 51:4030-7. [PMID: 18543899 DOI: 10.1021/jm701618q] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Radiolabeled sst 2 and sst 3 antagonists are better candidates for tumor targeting than agonists with comparable binding characteristics (Ginj, M.; Zhang, H.; Waser, B.; Cescato, R.; Wild, D.; Erchegyi, J.; Rivier, J.; Mäcke, H. R.; Reubi, J. C. Proc. Natl. Acad. Sci. U.S.A. 2006, 103, 16436-16441.). Because most of the neuroendocrine tumors express sst 2, we used the known antagonists acetyl- pNO 2Phe (2)- c[ dCys (3)-Tyr (7)- dTrp (8)-Lys (9)-Thr (10)-Cys (14)]- dTyr (15)-NH 2 ( 1) (Bass, R. T.; Buckwalter, B. L.; Patel, B. P.; Pausch, M. H.; Price, L. A.; Strnad, J.; Hadcock, J. R. Mol. Pharmacol. 1996, 50, 709-715. Bass, R. T.; Buckwalter, B. L.; Patel, B. P.; Pausch, M. H.; Price, L. A.; Strnad, J.; Hadcock, J. R. Mol. Pharmacol. 1997, 51, 170; Erratum.) and H-Cpa (2)- c[ dCys (3)-Tyr (7)- dTrp (8)-Lys (9)-Thr (10)-Cys (14)]-2Nal (15)-NH 2 ( 7) (Hocart, S. J.; Jain, R.; Murphy, W. A.; Taylor, J. E.; Coy, D. H. J. Med. Chem. 1999, 42, 1863-1871.) as leads for analogues with increased sst 2 binding affinity and selectivity. Among the 32 analogues reported here, DOTA- pNO 2Phe (2)- c[ dCys (3)-Tyr (7)- dAph (8)(Cbm)-Lys (9)-Thr (10)-Cys (14)- dTyr (15)-NH 2 ( 3) and DOTA-Cpa (2)- c[ dCys (3)-Aph (7)(Hor)- dAph (8)(Cbm)-Lys (9)-Thr (10)-Cys (14)]- dTyr (15)-NH 2 ( 31) had the highest sst 2 binding affinity and selectivity. All of the analogues tested kept their sst 2 antagonistic properties (i.e., did not affect calcium release in vitro and competitively antagonized the agonistic effect of [Tyr (3)]octreotide). Moreover, in an immunofluorescence-based internalization assay, the new analogues prevented sst 2 internalization induced by the sst 2 agonist [Tyr (3)]octreotide without being active by themselves. In conclusion, several analogues (in particular 3, 31, and 32) have outstanding sst 2 binding and functional antagonistic properties and, because of their DOTA moiety, are excellent candidates for in vivo targeting of sst 2-expressing cancers.
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Affiliation(s)
- Renzo Cescato
- Division of Cell Biology and Experimental Cancer Research, Institute of Pathology, University of Berne, Berne, Switzerland
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Samant MP, Hong DJ, Croston G, Rivier C, Rivier J. Novel analogues of degarelix incorporating hydroxy-, methoxy-, and pegylated-urea moieties at positions 3, 5, 6 and the N-terminus. Part III. J Med Chem 2006; 49:3536-43. [PMID: 16759096 PMCID: PMC2536684 DOI: 10.1021/jm060240a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel degarelix (Fe200486) analogues were screened for antagonism of GnRH-induced response (IC(50)) in a reporter gene assay. Inhibition of luteinizing hormone release over time was measured in the castrated male rat. N(omega)-Hydroxy- and N(omega)-methoxy-carbamoylation of Dab and Dap at position 3 (3-6), and N(omega)-hydroxy-,N(omega)-methoxy-carbamoylation and pegylation of 4Aph at positions 5 and 6 (7-10, 15-17, 22-25) were carried out. Modulation of hydrophobicity was achieved using different acylating groups at the N-terminus (11-14, 18-21, 26-28). Analogues 8, 15-17, 22, and 23 were equipotent to acyline (IC(50) = 0.69 nM) and degarelix (IC(50) = 0.58 nM) in vitro. Analogues 7, 17, and 23 were shorter acting than acyline, when 9, 11, 13, 15, 16, and 22 were longer acting. Only 9 and 14 were inactive at releasing histamine. No analogue exhibited a duration of action comparable to that of degarelix. Analogues with shorter and longer retention times on HPLC (a measure of hydrophilicity) than degarelix were identified.
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Affiliation(s)
- Manoj P Samant
- The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute, 10010 N. Torrey Pines Road, La Jolla, California 92037, USA
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Samant MP, Gulyas J, Hong DJ, Croston G, Rivier C, Rivier J. Iterative approach to the discovery of novel degarelix analogues: substitutions at positions 3, 7, and 8. Part II. J Med Chem 2005; 48:4851-60. [PMID: 16033265 PMCID: PMC2593149 DOI: 10.1021/jm050134t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Degarelix (FE200486, Ac-d-2Nal(1)-d-4Cpa(2)-d-3Pal(3)-Ser(4)-4Aph(l-Hor)(5)-d-4Aph(Cbm)(6)-Leu(7)-ILys(8)-Pro(9)-d-Ala(10)-NH(2)) is a potent and very long acting antagonist of gonadotropin-releasing hormone (GnRH) after subcutaneous administration in mammals including humans. Analogues of degarelix were synthesized, characterized, and screened for the antagonism of GnRH-induced response in a reporter gene assay in HEK-293 cells expressing the human GnRH receptor. The duration of action was also determined in the castrated male rat assay to measure the extent (efficacy and duration of action) of inhibition of luteinizing hormone (LH) release. Structurally, this series of analogues has novel substitutions at positions 3, 7, and 8 and N(alpha)-methylation at positions 6, 7, and 8 in the structure of degarelix. These substitutions were designed to probe the spatial limitations of the receptor's cavity and to map the steric and ionic boundaries. Some functional groups were introduced that were hypothesized to influence the phamacokinetic properties of the analogues such as bioavailability, solubility, intra- or intermolecular hydrogen bond forming capacity, and ability to bind carrier proteins. Substitutions at positions 3 ([N(beta)-(2-pyridyl-methyl)d-Dap(3)]degarelix, IC(50) = 2.71 nM) (5), 7 ([Pra(7)]degarelix, IC(50) = 2.11 nM) (16), and 8 ([N(delta)-(IGly)Orn(8)]degarelix, IC(50) = 1.38 nM) (20) and N-methylation ([N(alpha)-methyl-Leu(7)]degarelix, IC(50) = 1.47 nM) (32) yielded analogues that were equipotent to degarelix (2) in vitro (IC(50) = 1.64 nM) but shorter acting in vivo. Out of the 33 novel analogues tested for the duration of action in this series, two analogues ([N(epsilon)-cyclohexyl-Lys(8)]degarelix, IC(50) = 1.50 nM) (23) and ([N(beta)-(IbetaAla)Dap(8)]degarelix, IC(50) = 1.98 nM) (26) had antagonist potencies and duration of action similar to that of azaline B {inhibited LH (>80%) release for >72 h after sc injection to castrated male rats at a standard dose of 50 mug/rat in 5% mannitol}. Under similar conditions analogues ([N(gamma)-(IGly)Dab(8)]degarelix, IC(50) = 1.56 nM) (21) and ([IOrn(8)]degarelix, IC(50) = 1.72 nM) (18) had a longer duration of action {inhibited LH (>96 h) release} than azaline B; however they were shorter acting than degarelix. Hydrophilicity of these analogues, a potential measure of their ability to be formulated for sustained release, was determined using RP-HPLC at neutral pH yielding analogues with shorter as well as longer retention times. No correlation was found between retention times and antagonist potency or duration of action.
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Affiliation(s)
- Manoj P. Samant
- The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037
| | - Jozsef Gulyas
- The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037
| | - Doley J. Hong
- Ferring Research Institute Inc., 3550 General Atomics Ct., San Diego, California 92121
| | - Glenn Croston
- Ferring Research Institute Inc., 3550 General Atomics Ct., San Diego, California 92121
| | - Catherine Rivier
- The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037
| | - Jean Rivier
- The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037
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Affiliation(s)
- Luigi Aurelio
- Department of Chemistry, La Trobe University, Victoria 3086, Australia
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Reubi JC, Schaer JC, Wenger S, Hoeger C, Erchegyi J, Waser B, Rivier J. SST3-selective potent peptidic somatostatin receptor antagonists. Proc Natl Acad Sci U S A 2000; 97:13973-8. [PMID: 11095748 PMCID: PMC17685 DOI: 10.1073/pnas.250483897] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A family of octapeptide derivatives of somatostatin cyclized via a disulfide bridge (des-AA(1,2,4,5,12,13)[d-2Nal(8)]-somatostatin-14, ODN-8) was identified that has high affinity and selectivity for the human sst(3) somatostatin receptor subtype transfected in CCL39 cells. The binding affinity of carbamoyl-des-AA(1,2,4,5,12, 13)[d-Cys(3),Tyr(7),d-Agl(8)(Me,2-naphthoyl)]-somatostatin-14 (sst(3)-ODN-8) is equal to that of somatostatin-28 for sst(3) and less than one-thousandth that for the other four somatostatin receptor subtypes. Compound sst(3)-ODN-8 potently reverses the somatostatin-28-induced inhibition of forskolin-stimulated cAMP production (pK(B) = 9.07) and reverses the somatostatin-28-induced stimulation of phospholipase C activity (pK(i) = 9.22) in sst(3)-transfected CCL39 cells. [(125)I-Tyr(7)]sst(3)-ODN-8 selectively labels sst(3)-expressing cells with subnanomolar binding affinity (K(D) = 0.27 nM). With the use of this radioligand, sst(3)-expressing human tumors, particularly inactive pituitary adenomas, can be identified with receptor autoradiography; moreover, areas of the human lymphoreticular system express sst(3) binding sites selectively displaced by nanomolar concentrations of sst(3)-ODN-8. Based on the structure-activity relationship of selected analogs substituted at positions 3, 7, and 8, we hypothesize that the basis for sst(3) selectivity, high affinity, and possibly antagonism resides in the ring size of the analog and the unique conformational and structural character of the N-methylated amino-2-naphthoyl side chain of aminoglycine at position 8 and not in the Tyr(7) substitution or in the d-configuration at position 3. The family of labeled and unlabeled sst(3)-ODN-8 analogs represents highly innovative, potent, and specific sst(3)-selective antagonist tools for the study of sst(3)-mediated physiological and pathophysiological conditions that may suggest novel clinical applications.
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Affiliation(s)
- J C Reubi
- Division of Cell Biology and Experimental Cancer Research, Institute of Pathology, University of Berne, Switzerland.
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Li WR, Peng SZ. Rational design and synthesis of unsaturated 2,5-dioxopiperazine derivatives as potential protein tyrosine kinase inhibitors. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)01599-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Fernández-García C, Prager K, McKervey MA, Walker B, Williams CH. Solid phase synthesis of N-carboxy alkyl-containing peptides derived from enantiopure alpha-keto-beta-aminoacids. Bioorg Med Chem Lett 1998; 8:433-6. [PMID: 9871593 DOI: 10.1016/s0960-894x(98)00054-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
alpha-Keto-beta-aminoacids 5a-c can be reductively aminated with the peptide sequence H2N-Leu-Val-Phe-Phe on a solid support to afford N-carboxy alkyl peptides 1a-c. The N-carboxy alkyl lysine derivative 7 was subsequently extended from the N-terminus with glutamine and histidine residues.
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Brown EG, Nuss JM. Alkylation of Rink's amide linker on polystyrene resin: A reductive amination approach to modified amine-linkers for the solid phase synthesis of N-substituted amide derivatives. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)10279-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Paikoff SJ, Wilson TE, Cho CY, Schultz PG. The solid phase synthesis of N-alkylcarbamate oligomers. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)01197-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Rivera-Baeza C, Kaljuste K, Undén A. Backbone-to-backbone cyclized and linear pseudopeptide analogs of substance P as ligands to the substance P receptor from rat brain. Neuropeptides 1996; 30:327-33. [PMID: 8914858 DOI: 10.1016/s0143-4179(96)90021-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Two series of backbone modified substance P analogs were synthesized. In the first group of analogs the N-terminal region of substance P, SP(1-4), was replaced by a polyamine segment or aliphatic omega-amino fatty acid residues. Two of these analogs displaced 125I-Bolton-Hunter labeled substance P from rat brain synaptosomes with IC50 values of 1.3 +/- 0.5 and 1.6 +/- 0.3 nM, respectively. These affinities are similar to that of substance P (IC50 1.3 nM). The second group of analogs were a set of backbone-to-backbone cyclized pseudopeptides. In these analogs two peptide bonds at the C-terminal portion of substance P were replaced by the reduced peptide bonds (psi[CH2NH]) which were further reductively alkylated with 3(4-methylbenzylthio)propanal. After cleavage from the resin the peptides were oxidized into a cyclic disulfide. All of the cyclic analogs of substance P interacted with the NK1 receptor from rat brain with IC50 values in the micromolar range.
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Affiliation(s)
- C Rivera-Baeza
- Department of Neurochemistry and Neurotoxicology, Arrhenius Laboratories for Natural Sciences, Stockholm University, Sweden
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Koh JS, Ellman JA. Palladium-Mediated Three-Component Coupling Strategy for the Solid-Phase Synthesis of Tropane Derivatives(1). J Org Chem 1996; 61:4494-4495. [PMID: 11667363 DOI: 10.1021/jo960638m] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jong Sung Koh
- Department of Chemistry, University of California, Berkeley, California 94720
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Čudić M, Kojić-Prodić B, Milinković V, Horvat J, Horvat Š, Elofsson M, Kihlberg J. Preparation and structural characterization of N-glycated amino acid and linear or cyclic dipeptides containing the 6-amino-6-deoxy-1,2:3,4-di-O-isopropylidene-α-d-galactopyranose moiety. Carbohydr Res 1996. [DOI: 10.1016/0008-6215(96)00061-4] [Citation(s) in RCA: 7] [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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