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Yayat HNA, Maharani R, Hidayat AT, Wiani I, Zainuddin A, Mayanti T, Nurlelasari, Harneti D, Supratman U. Total synthesis of a reversed cyclopurpuracin using a combination of solid and solution phase methods. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hasna Noer Agus Yayat
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Rani Maharani
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Laboratorium Sentral Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Ace Tatang Hidayat
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Laboratorium Sentral Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Ika Wiani
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Achmad Zainuddin
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Tri Mayanti
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Nurlelasari
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Desi Harneti
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
| | - Unang Supratman
- Department of Chemistry Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
- Laboratorium Sentral Universitas Padjadjaran, Jatinangor West Java Indonesia
- Study Centre of Natural Products and Synthesis, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor West Java Indonesia
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2
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Minta E, Kafarski P, Martinez J, Rolland V. Synthesis of cyclooctapeptides: constraints analogues of the peptidic neurotoxin, omega-agatoxine IVB-an experimental point of view. J Pept Sci 2008; 14:267-77. [PMID: 17853503 DOI: 10.1002/psc.919] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
omega-AGA IVB is an important lead structure when considering the design of effectors of glutamate release inducting P/Q-type calcium channels. The best route to achieve the analogues possessing the three-dimensional arrangement corresponding to the native binding loop was the introduction of constraint by ring formation via side chain to side chain lactamization for suitably protected Lys and Glu residues. Since tryptophane residue located at position 14 of this neuropeptide has been suggested as essential for binding, analogues in which this amino acid was replaced by aza-tryptophane and alanine were synthesized. The synthesis was carried out on various acid-labile resins (BARLOS chlorotrityl, Rink amide, PEG-based or Wang resins), by Fmoc strategy. In this paper, we describe optimization of the peptide cyclization with various protecting groups, and on resin or in solution cyclization experimental parameters.
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Affiliation(s)
- Ewelina Minta
- IBMM, UMR 5247, CNRS, Max Mousseron Institut of Biomolecules, Montpellier 1 & 2, Place E.Bataillon, Montpellier, France
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3
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3-(4-Hydroxymethylphenylsulfanyl)propanoic acid (HMPPA) as a new safety catch linker in solid phase peptide synthesis. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.04.138] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Chakraborty TK, Koley D, Prabhakar S, Ravi R, Kunwar AC. Synthesis and conformational studies of amide-linked cyclic homooligomers of a thymidine-based nucleoside amino acid. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.07.089] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Abstract
Constricting the peptide backbone into a more defined conformational form through cyclization is an activity evolved in nature and in synthetic work, the latter straddling only the most recent decades. The resulting conformational constraints increase the probability of an optimum response with bio-receptors. The purpose of this review is to highlight developments that have proved to be reasonably efficient in the macrocyclization of linear precursors into cyclic peptides and depsipeptides.
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Affiliation(s)
- John S Davies
- Department of Chemistry, University of Wales, Swansea, Singleton Park, Swansea SA2 8PP, UK.
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6
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Abstract
Side-chain lactam bridges linking amino acid residues that are spaced several residues apart in the linear sequence offer a convenient and flexible method for introducing conformational constraints into a peptide structure. The availability of a variety of selectively cleavable protecting groups for amines and carboxylic acids allows for several approaches to the synthesis of monocyclic, dicyclic, and bicyclic lactam-bridged peptides by solid-phase methods. Multicyclic structures are also accessible, but segment-condensation syntheses with solution-phase cyclizations are most likely to provide the best synthetic approach to these more complex constrained peptides. Lactam bridges linking (i, i + 3)-, (i, i + 4), and (i, i + 7)-spaced residue pairs have all proven useful for stabilization of alpha helices, and (i, i + 3)-linked residues have also been demonstrated to stabilize beta-turns. These structures are finding an increasing number of applications in protein biology, including studies of protein folding, protein aggregation, peptide ligand-receptor recognition, and the development of more potent peptide therapeutics. Defining the functional roles of the amphiphilic alpha-helices in medium-sized peptide hormones, and studying helix propagation from rigid, alpha-helix initiating bicyclic peptides are among the most exciting developments currently underway in this field.
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Affiliation(s)
- John W Taylor
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, USA.
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7
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Cavallaro V, Thompson PE, Hearn MT. Solid-phase synthesis of cyclic analogues related to the hypoglycaemic peptide hGH(6-13): comparison of two i-->i + 4 lactam cyclization procedures. J Pept Sci 2001; 7:529-36. [PMID: 11695648 DOI: 10.1002/psc.343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The use of 1,3-diisopropylcarbodiimide (DIC) for the synthesis of cyclic analogues of the hypoglycaemic peptide fragment derived from the N-terminus of human growth hormone (hGH), namely hGH[6-13], is described. Different strategies were examined to achieve improved yields for the on resin side-chain to side-chain cyclization of the corresponding linear peptides containing reverse beta-turn motifs. When compared with the more reactive Castro's reagent, the results confirm that DIC in the presence of HOBt can be successfully employed to minimize the formation of intermolecular oligomeric byproducts associated with the preparation of cyclic hGH[6-14] peptide analogues based on an i-->(i + 4)Lys-->Glu or Glu-->Lys cyclization strategy.
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Affiliation(s)
- V Cavallaro
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
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8
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Alexander McNamara LM, Andrews MJ, Mitzel F, Siligardi G, Tabor AB. Peptides constrained by an aliphatic linkage between two C(alpha) sites: design, synthesis, and unexpected conformational properties of an i,(i + 4)-linked peptide. J Org Chem 2001; 66:4585-94. [PMID: 11421778 DOI: 10.1021/jo015508e] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel route for the synthesis of cyclic peptides constrained by an aliphatic bridge between two C(alpha)sites, using a triply orthogonal protecting group strategy, is described. The synthesis of the orthogonally protected bis-amino acid 1, via an enantioselective route utilizing the Schöllkopf and Evans methodologies, is first described. This is then incorporated into a short, alanine-rich peptide 13, using a novel triply orthogonal protecting group strategy to couple first one, then the other, amino acid moiety in such a way that an aliphatic bridge is formed between the i and i + 4 positions. Unexpectedly, the resulting constrained peptide does not adopt a helical conformation: instead, it is shown by CD at low temperature to adopt a left-handed type II beta-turn conformation in aqueous media and a right-handed type I beta-turn conformation in TFE.
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Affiliation(s)
- L M Alexander McNamara
- Department of Chemistry, University College London, Christoper Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, U.K
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O'Bryan MK, Sebire K, Meinhardt A, Edgar K, Keah HH, Hearn MT, De Kretser DM. Tpx-1 is a component of the outer dense fibers and acrosome of rat spermatozoa. Mol Reprod Dev 2001; 58:116-25. [PMID: 11144214 DOI: 10.1002/1098-2795(200101)58:1<116::aid-mrd14>3.0.co;2-8] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Previously we reported the cloning of a member of the cysteine-rich secretory protein family, tpx-1, from a testis expression library using an outer dense fiber (ODF)-specific antiserum. Using immunohistochemical and immunoelectron microscopic techniques and Western blotting of purified sperm tail components, we have determined that tpx-1 exists as 25 and 27 kDa proteins in two components of rat spermatid: the ODFs and the acrosome. Tpx-1 mRNA is first expressed in the late pachytene spermatocytes, but the production of these tpx-1 proteins is translationally delayed for 4-5 days before being incorporated into the developing sperm acrosome, surrounding the elongating and condensing spermatid nucleus. Concurrent with sperm head formation, tpx-1 protein was incorporated into the developing sperm tail, and specifically the ODFs. The tpx-1 protein was seen within structures resembling granulated bodies in the cytoplasmic lobe of elongating spermatids and was incorporated subsequently into the growing tail in a manner consistent with ODF development. In addition, tpx-1 protein was localized at the ultrastructural level of the connecting piece of the neck and longitudinal columns of the fibrous sheath, suggesting common protein components in these cytoskeletal structures. As such, tpx-1 may have functional significance in the processes of sperm head development and tail function.
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Affiliation(s)
- M K O'Bryan
- Monash Institute of Reproduction and Development, Monash Medical Centre, Clayton, Australia.
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Anichini B, Ricci R, Fabbri G, Balacco G, Mauro S, Triolo A, Altamura M, Maggi CA, Quartara L. Solid-phase synthesis of MEN 11270, a new cyclic peptide kinin B2 receptor antagonist. J Pept Sci 2000; 6:612-20. [PMID: 11192241 DOI: 10.1002/1099-1387(200012)6:12<612::aid-psc291>3.0.co;2-k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
An efficient synthesis of the cyclic decapeptide MEN 11270 [H-DArg1-Arg2 Pro3-Hyp4-Gly5-Thi6-Dab7-DTic8-Oic9-Arg10 c(7gamma - 10alpha)] was developed. Two three-dimensional orthogonal strategies were applied and compared: Fmoc/Tos/Boc (procedure A) and Fmoc/Pmc/Dde (procedure B). Both resulted in a 23-step strategy comprising the stepwise solid-phase chain assembly of the linear protected peptide, partial deprotection, solution-phase cyclization and final full deprotection. The stepwise assembly of the linear peptide was optimized by double coupling and acylation time prolongation for critical residues (Tic, Dab, Thi, Pro). O-(7-azabenzotriazol-1-yl)-N,N,N',N' tetramethyluronium (HATU) was preferred as coupling reagent for Dab. In the cyclization step, the partial racemization of Arg10 (31% using 1-ethyl-3-(3'-dimethyl-aminopropyl) carbodiimide/1-hydroxybenzotriazole (EDC/HOBt) as activation system) was reduced to 3% with HATU. The final deprotection was performed in the presence of dimethylsulfide (procedure A) and thiocresol (procedure B) as scavengers, to avoid the sulfation of Hyp side chain. The final compound and the main by-products were characterized by mass spectroscopy (MS), nuclear magnetic resonance (NMR) and racemization test. Procedure B produced operationally simpler and more efficient results than A (28% overall yield versus 4%).
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11
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Sitaram BR, Keah HH, Hearn MT. Studies on the relationship between structure and electrophoretic mobility of alpha-helical and beta-sheet peptides using capillary zone electrophoresis. J Chromatogr A 1999; 857:263-73. [PMID: 10536845 DOI: 10.1016/s0021-9673(99)00768-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The electrophoretic behaviour of a series of 33 different synthetic peptides has been investigated using free solution high-performance capillary zonal electrophoretic (HPCZE) methods. The dependency of the electrophoretic mobility, mu(em), on the peptide charge, q, and on the charge-to-size ratio parameter, zeta, determined according to several electromobility models, have been examined. Significant divergences from linearity in the mu(em) vs. q or the mu(em) vs. zeta plots were noted for several peptides, possibly due to the proclivity of specific arrangements of their amino acid sequences to assume preferred alpha-helical or beta-sheet conformational features rather than random coil structures under the HPCZE conditions. These results provide further demonstration of the facility of HPCZE procedures to probe the effects of compositional, sequential and conformational differences of closely-related peptides and their consequences on their physicochemical behaviour in solution.
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Affiliation(s)
- B R Sitaram
- Centre for Bioprocess Technology, Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
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