1
|
Zhang C, Chen S, Fu X, Dedkova LM, Hecht SM. Enhancement of N-Methyl Amino Acid Incorporation into Proteins and Peptides Using Modified Bacterial Ribosomes and Elongation Factor P. ACS Chem Biol 2024; 19:1330-1338. [PMID: 38769080 DOI: 10.1021/acschembio.4c00165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
N-Methylated amino acids are constituents of natural bioactive peptides and proteins. Nα-methylated amino acids appear abundantly in natural cyclic peptides, likely due to their constraint of peptide conformation and contribution to peptide stability. Peptides containing Nα-methylated amino acids have long been prepared by chemical synthesis. While such natural peptides are not produced ribosomally, recent ribosomal strategies have afforded Nα-methylated peptides. Presently, we define new strategies for the ribosomal incorporation of Nα-methylated amino acids into peptides and proteins. First, we identify modified ribosomes capable of facilitating the incorporation of six N-methylated amino acids into antibacterial scorpion peptide IsCT. Also synthesized analogously was a protein domain (RRM1) from hnRNP LL; improved yields were observed for nearly all tested N-methylated amino acids. Computational modeling of the ribosomal assembly illustrated how the distortion imposed by N-methylation could be compensated by altering the nucleotides in key 23S rRNA positions. Finally, it is known that incorporation of multiple prolines (an N-alkylated amino acid) ribosomally can be facilitated by bacterial elongation factor P. We report that supplementing endogenous EF-P during IsCT peptide and RRM1 protein synthesis gave improved yields for most of the N-methylated amino acids studied.
Collapse
Affiliation(s)
- Chao Zhang
- Biodesign Center for BioEnergetics, Arizona State University, Tempe, Arizona 85287, United States
| | - Shengxi Chen
- Biodesign Center for BioEnergetics, Arizona State University, Tempe, Arizona 85287, United States
| | - Xuan Fu
- Biodesign Center for BioEnergetics, Arizona State University, Tempe, Arizona 85287, United States
| | - Larisa M Dedkova
- Biodesign Center for BioEnergetics, Arizona State University, Tempe, Arizona 85287, United States
| | - Sidney M Hecht
- Biodesign Center for BioEnergetics, and School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| |
Collapse
|
2
|
Ding Y, Lambden E, Peate J, Picken LJ, Rees TW, Perez-Ortiz G, Newgas SA, Spicer LAR, Hicks T, Hess J, Ulmschneider MB, Müller MM, Barry SM. Rapid Peptide Cyclization Inspired by the Modular Logic of Nonribosomal Peptide Synthetases. J Am Chem Soc 2024; 146:16787-16801. [PMID: 38842580 PMCID: PMC11191687 DOI: 10.1021/jacs.4c04711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 05/12/2024] [Accepted: 05/14/2024] [Indexed: 06/07/2024]
Abstract
Nonribosomal cyclic peptides (NRcPs) are structurally complex natural products and a vital pool of therapeutics, particularly antibiotics. Their structural diversity arises from the ability of the multidomain enzyme assembly lines, nonribosomal peptide synthetases (NRPSs), to utilize bespoke nonproteinogenic amino acids, modify the linear peptide during elongation, and catalyze an array of cyclization modes, e.g., head to tail, side chain to tail. The study and drug development of NRcPs are often limited by a lack of easy synthetic access to NRcPs and their analogues, with selective macrolactamization being a major bottleneck. Herein, we report a generally applicable chemical macrocyclization method of unprecedented speed and selectivity. Inspired by biosynthetic cyclization, it combines the deprotected linear biosynthetic precursor peptide sequence with a highly reactive C-terminus to produce NRcPs and analogues in minutes. The method was applied to several NRcPs of varying sequences, ring sizes, and cyclization modes including rufomycin, colistin, and gramicidin S with comparable success. We thus demonstrate that the linear order of modules in NRPS enzymes that determines peptide sequence encodes the key structural information to produce peptides conformationally biased toward macrocyclization. To fully exploit this conformational bias synthetically, a highly reactive C-terminal acyl azide is also required, alongside carefully balanced pH and solvent conditions. This allows for consistent, facile cyclization of exceptional speed, selectivity, and atom efficiency. This exciting macrolactamization method represents a new enabling technology for the biosynthetic study of NRcPs and their development as therapeutics.
Collapse
Affiliation(s)
- Yaoyu Ding
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Edward Lambden
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Jessica Peate
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Lewis J. Picken
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Thomas W. Rees
- The
Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K.
| | - Gustavo Perez-Ortiz
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Sophie A. Newgas
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Lucy A. R. Spicer
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Thomas Hicks
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Jeannine Hess
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
- The
Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K.
| | - Martin B. Ulmschneider
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Manuel M. Müller
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| | - Sarah M. Barry
- Department
of Chemistry, Faculty of Natural, Mathematical, and Engineering Sciences, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
| |
Collapse
|
3
|
McInturff EL, France SP, Leverett CA, Flick AC, Lindsey EA, Berritt S, Carney DW, DeForest JC, Ding HX, Fink SJ, Gibson TS, Gray K, Hubbell AK, Johnson AM, Liu Y, Mahapatra S, McAlpine IJ, Watson RB, O'Donnell CJ. Synthetic Approaches to the New Drugs Approved During 2021. J Med Chem 2023; 66:10150-10201. [PMID: 37528515 DOI: 10.1021/acs.jmedchem.3c00501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
Each year, new drugs are introduced to the market, representing structures that have affinity for biological targets implicated in human diseases and conditions. These new chemical entities (NCEs), particularly small molecules and antibody-drug conjugates, provide insight into molecular recognition and serve as potential leads for the design of future medicines. This annual review is part of a continuing series highlighting the most likely process-scale synthetic approaches to 35 NCEs that were first approved anywhere in the world during 2021.
Collapse
Affiliation(s)
- Emma L McInturff
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Scott P France
- Process Research & Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Carolyn A Leverett
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Andrew C Flick
- Takeda Pharmaceuticals, 9625 Towne Centre Drive, San Diego, California 92121, United States
| | - Erick A Lindsey
- Takeda Pharmaceuticals, 9625 Towne Centre Drive, San Diego, California 92121, United States
| | - Simon Berritt
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Daniel W Carney
- Takeda Pharmaceuticals, 9625 Towne Centre Drive, San Diego, California 92121, United States
| | - Jacob C DeForest
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10777 Science Center Drive, San Diego, California 92121, United States
| | - Hong X Ding
- Pharmacodia (Beijing) Co. Ltd., Beijing, 100085, China
| | - Sarah J Fink
- Takeda Pharmaceuticals, 125 Binney Street, Cambridge, Massachusetts 02142, United States
| | - Tony S Gibson
- Takeda Pharmaceuticals, 9625 Towne Centre Drive, San Diego, California 92121, United States
| | - Kaitlyn Gray
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Aran K Hubbell
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Amber M Johnson
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Yiyang Liu
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Subham Mahapatra
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Indrawan J McAlpine
- Genesis Therapeutics, 11568 Sorrento Valley Road, Suite 8, San Diego, California 92121, United States
| | - Rebecca B Watson
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10777 Science Center Drive, San Diego, California 92121, United States
| | - Christopher J O'Donnell
- Groton Laboratories, Pfizer Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| |
Collapse
|
4
|
Chaudhari TY, Bisht S, Chorol S, Bhujbal SM, Bharatam PV, Tandon V. Bronsted Acid-Catalyzed Regioselective Carboxamidation of 2-Indolylmethanols with Isonitriles. J Org Chem 2023. [PMID: 37440673 DOI: 10.1021/acs.joc.2c02816] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/15/2023]
Abstract
A regioselective direct carboxamidation reaction of 2-indolylmethanols with readily available isocyanoesters/isocyanides has been reported in this work. The reaction was catalyzed by Bronsted acid such as p-TsOH to deliver the benzylic regioselective amides in 67-86% yield under mild conditions. The developed methodology provides alternative access to traditional metal-free carboxamidation via C-C and C-O bond formation with high atom economy. Furthermore, the developed approach was diversified to synthesize chiral indole-2-carboxamide derivatives with a moderate enantiomeric excess (61-73% ee) using an (R)-chiral phosphoric acid.
Collapse
Affiliation(s)
| | - Somya Bisht
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India
| | - Sonam Chorol
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Shivkanya Madhavrao Bhujbal
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160062, Punjab, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160062, Punjab, India
| | - Vibha Tandon
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India
| |
Collapse
|
5
|
Batalha PN, Forezi LSM, Lima CGS, Pauli FP, Boechat FCS, de Souza MCBV, Cunha AC, Ferreira VF, da Silva FDC. Drug repurposing for the treatment of COVID-19: Pharmacological aspects and synthetic approaches. Bioorg Chem 2021; 106:104488. [PMID: 33261844 PMCID: PMC7676325 DOI: 10.1016/j.bioorg.2020.104488] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/20/2020] [Accepted: 11/16/2020] [Indexed: 02/06/2023]
Abstract
In December 2019, a new variant of SARS-CoV emerged, the so-called acute severe respiratory syndrome coronavirus 2 (SARS-CoV-2). This virus causes the new coronavirus disease (COVID-19) and has been plaguing the world owing to its unprecedented spread efficiency, which has resulted in a huge death toll. In this sense, the repositioning of approved drugs is the fastest way to an effective response to a pandemic outbreak of this scale. Considering these facts, in this review we provide a comprehensive and critical discussion on the chemical aspects surrounding the drugs currently being studied as candidates for COVID-19 therapy. We intend to provide the general chemical community with an overview on the synthetic/biosynthetic pathways related to such molecules, as well as their mechanisms of action against the evaluated viruses and some insights on the pharmacological interactions involved in each case. Overall, the review aims to present the chemical aspects of the main bioactive molecules being considered to be repositioned for effective treatment of COVID-19 in all phases, from the mildest to the most severe.
Collapse
Affiliation(s)
- Pedro N Batalha
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil.
| | - Luana S M Forezi
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil
| | - Carolina G S Lima
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil
| | - Fernanda P Pauli
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil
| | - Fernanda C S Boechat
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil
| | - Maria Cecília B V de Souza
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil
| | - Anna C Cunha
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil
| | - Vitor F Ferreira
- Universidade Federal Fluminense, Faculdade de Farmácia, Departamento de Tecnologia Farmacêutica, CEP 24241-000 Niterói, RJ, Brazil.
| | - Fernando de C da Silva
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, CEP 24020-150 Niterói, RJ, Brazil.
| |
Collapse
|
6
|
Bond AG, Testa A, Ciulli A. Stereoselective synthesis of allele-specific BET inhibitors. Org Biomol Chem 2020; 18:7533-7539. [PMID: 32756710 DOI: 10.1039/d0ob01165g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Developing stereoselective synthetic routes that are efficient and cost-effective allows easy access to biologically active molecules. Our previous syntheses of allele-selective bumped inhibitors of the Bromo and Extra-Terminal (BET) domain proteins, Brd2, Brd3, Brd4 and BrdT, required a wasteful, late-stage alkylation step and expensive chiral separation. To circumvent these limitations, we developed a route based on stereocontrolled alkylation of an N-Pf protected aspartic acid derivative that was used in a divergent, racemisation-free protocol to yield structurally diverse and enantiopure triazolodiazepines. With this approach, we synthesized bumped thienodiazepine-based BET inhibitor, ET-JQ1-OMe, in five steps and 99% ee without the need for chiral chromatography. Exquisite selectivity of ET-JQ1-OMe for Leu-Ala and Leu-Val mutants over wild-type bromodomain was established by isothermal titration calorimetry and X-ray crystallography. Our new approach provides unambiguous chemical evidence for the absolute stereochemistry of the active, allele-specific BET inhibitors and a viable route that will open wider access to this compound class.
Collapse
Affiliation(s)
- Adam G Bond
- Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, James Black Centre, Dow Street, Dundee DD1 5EH, UK.
| | | | | |
Collapse
|
7
|
Otake Y, Shibata Y, Hayashi Y, Kawauchi S, Nakamura H, Fuse S. N‐Methylated Peptide Synthesis via Generation of an Acyl N‐Methylimidazolium Cation Accelerated by a Brønsted Acid. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002106] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuma Otake
- Laboratory for Chemistry and Life Science Institute of Innovative Research Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
- School of Life Science and Technology Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
| | - Yusuke Shibata
- School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Yoshihiro Hayashi
- School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Susumu Kawauchi
- School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science Institute of Innovative Research Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
| | - Shinichiro Fuse
- Department of Basic Medicinal Sciences Graduate School of Pharmaceutical Sciences Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8601 Japan
| |
Collapse
|
8
|
Otake Y, Shibata Y, Hayashi Y, Kawauchi S, Nakamura H, Fuse S. N-Methylated Peptide Synthesis via Generation of an Acyl N-Methylimidazolium Cation Accelerated by a Brønsted Acid. Angew Chem Int Ed Engl 2020; 59:12925-12930. [PMID: 32274844 DOI: 10.1002/anie.202002106] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Indexed: 12/31/2022]
Abstract
The development of a robust amide-bond formation remains a critical aspect of N-methylated peptide synthesis. In this study, we synthesized a variety of dipeptides in high yields, without severe racemization, from equivalent amounts of amino acids. Highly reactive N-methylimidazolium cation species were generated in situ to accelerate the amidation. The key to success was the addition of a strong Brønsted acid. The developed amidation enabled the synthesis of a bulky peptide with a higher yield in a shorter amount of time compared with the results of conventional amidation. In addition, the amidation can be performed by using either a microflow reactor or a conventional flask. The first total synthesis of naturally occurring bulky N-methylated peptides, pterulamides I-IV, was achieved. Based on experimental results and theoretical calculations, we speculated that a Brønsted acid would accelerate the rate-limiting generation of acyl imidazolium cations from mixed carbonic anhydrides.
Collapse
Affiliation(s)
- Yuma Otake
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Yusuke Shibata
- School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Yoshihiro Hayashi
- School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Susumu Kawauchi
- School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Shinichiro Fuse
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan
| |
Collapse
|
9
|
Elagawany M, Hegazy L, Elgendy B. Catalyst- and organic solvent-free synthesis of thioacids in water. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.06.061] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
10
|
Patel D, Wairkar S. Recent advances in cyclosporine drug delivery: challenges and opportunities. Drug Deliv Transl Res 2019; 9:1067-1081. [DOI: 10.1007/s13346-019-00650-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
11
|
Saavedra CJ, Carro C, Hernández D, Boto A. Conversion of “Customizable Units” into N-Alkyl Amino Acids and Generation of N-Alkyl Peptides. J Org Chem 2019; 84:8392-8410. [DOI: 10.1021/acs.joc.9b00114] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Carlos J. Saavedra
- Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
- BIOSIGMA, Antonio Domı́nguez Alfonso 16, 38003-Sta. Cruz de Tenerife, Tenerife, Spain
| | - Carmen Carro
- Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
- BIOSIGMA, Antonio Domı́nguez Alfonso 16, 38003-Sta. Cruz de Tenerife, Tenerife, Spain
| | - Dácil Hernández
- Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Alicia Boto
- Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| |
Collapse
|
12
|
De Simone A, Georgiou C, Ioannidis H, Gupta AA, Juárez-Jiménez J, Doughty-Shenton D, Blackburn EA, Wear MA, Richards JP, Barlow PN, Carragher N, Walkinshaw MD, Hulme AN, Michel J. A computationally designed binding mode flip leads to a novel class of potent tri-vector cyclophilin inhibitors. Chem Sci 2019; 10:542-547. [PMID: 30746096 PMCID: PMC6335623 DOI: 10.1039/c8sc03831g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 10/14/2018] [Indexed: 12/27/2022] Open
Abstract
Cyclophilins (Cyps) are a major family of drug targets that are challenging to prosecute with small molecules because the shallow nature and high degree of conservation of the active site across human isoforms offers limited opportunities for potent and selective inhibition. Herein a computational approach based on molecular dynamics simulations and free energy calculations was combined with biophysical assays and X-ray crystallography to explore a flip in the binding mode of a reported urea-based Cyp inhibitor. This approach enabled access to a distal pocket that is poorly conserved among key Cyp isoforms, and led to the discovery of a new family of sub-micromolar cell-active inhibitors that offer unprecedented opportunities for the development of next-generation drug therapies based on Cyp inhibition. The computational approach is applicable to a broad range of organic functional groups and could prove widely enabling in molecular design.
Collapse
Affiliation(s)
- Alessio De Simone
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Charis Georgiou
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Harris Ioannidis
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Arun A Gupta
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Jordi Juárez-Jiménez
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Dahlia Doughty-Shenton
- Edinburgh Phenotypic Assay Centre , University of Edinburgh , Queen's Medical Research Institute , Little France Cres , Edinburgh , Scotland EH16 4TJ , UK
| | - Elizabeth A Blackburn
- The Edinburgh Protein Production Facility (EPPF) , University of Edinburgh , Level 3 Michael Swann Building, King's Buildings, Max Born Crescent , Edinburgh , Scotland EH9 3BF , UK
| | - Martin A Wear
- The Edinburgh Protein Production Facility (EPPF) , University of Edinburgh , Level 3 Michael Swann Building, King's Buildings, Max Born Crescent , Edinburgh , Scotland EH9 3BF , UK
| | - Jonathan P Richards
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Paul N Barlow
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Neil Carragher
- Cancer Research UK Edinburgh Centre , University of Edinburgh , MRC Institute of Genetics and Molecular Medicine , Crewe Road South , Edinburgh , Scotland EH4 2XR , UK
| | - Malcolm D Walkinshaw
- University of Edinburgh , Michael Swann Building, Max Born Crescent , Edinburgh , Scotland EH9 3BF , UK
| | - Alison N Hulme
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| | - Julien Michel
- University of Edinburgh , Joseph Black Building, King's Buildings, David Brewster Road , Edinburgh , Scotland EH9 3FJ , UK .
| |
Collapse
|
13
|
Ongpipattanakul C, Nair SK. Molecular Basis for Autocatalytic Backbone N-Methylation in RiPP Natural Product Biosynthesis. ACS Chem Biol 2018; 13:2989-2999. [PMID: 30204409 DOI: 10.1021/acschembio.8b00668] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
N-methylation of nucleic acids, proteins, and peptides is a chemical modification with significant impact on biological regulation. Despite the simplicity of the structural change, N-methylation can influence diverse functions including epigenetics, protein complex formation, and microtubule stability. While there are limited examples of N-methylation of the α-amino group of bacterial and eukaryotic proteins, there are no examples of catalysts that carry out post-translation methylation of backbone amides in proteins or peptides. Recent studies have identified enzymes that catalyze backbone N-methylation on a peptide substrate, a reaction with little biochemical precedent, in a family of ribosomally synthesized natural products produced in basidiomycetes. Here, we describe the crystal structures of Dendrothele bispora dbOphMA, a methyltransferase that catalyzes multiple N-methylations on the peptide backbone. We further carry out biochemical studies of this catalyst to determine the molecular details that promote this unusual chemical transformation. The structural and biochemical framework described here could facilitate biotechnological applications of catalysts for the rapid production of backbone N-methylated peptides.
Collapse
|
14
|
Luo H, Yin H, Tang C, Wang P, Liang F. Synthesis of cyclic peptide reniochalistatin E and conformational isomers. CHINESE CHEM LETT 2018. [DOI: 10.1016/j.cclet.2018.05.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
15
|
Gao XH, Xu YS, Fan YY, Gan LS, Zuo JP, Yue JM. Cascarinoids A-C, a Class of Diterpenoid Alkaloids with Unpredicted Conformations from Croton cascarilloides. Org Lett 2018; 20:228-231. [PMID: 29251945 DOI: 10.1021/acs.orglett.7b03592] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cascarinoids A-C (1-3), a new class of diterpenoid alkaloids with unpredicted conformations, were isolated and structurally characterized from Croton cascarilloides. It was demonstrated that the dispersion interaction might be one of the main contributors that stabilized the folded conformations for compounds 1-3. Compounds 2 and 3 showed moderate immunosuppressive activity against T and/or B lymphocyte cells.
Collapse
Affiliation(s)
- Xin-Hua Gao
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , 555 Zuchongzhi Road, Shanghai 201203, People's Republic of China.,University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, People's Republic of China
| | - Yan-Sheng Xu
- Laboratory of Immunology and Virology, Shanghai University of Traditional Chinese Medicine , Shanghai 201203, People's Republic of China
| | - Yao-Yue Fan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , 555 Zuchongzhi Road, Shanghai 201203, People's Republic of China
| | - Li-She Gan
- Institute of Modern Chinese Medicine, College of Pharmaceutical Sciences, Zhejiang University , Hangzhou 310058, People's Republic of China
| | - Jian-Ping Zuo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , 555 Zuchongzhi Road, Shanghai 201203, People's Republic of China.,Laboratory of Immunology and Virology, Shanghai University of Traditional Chinese Medicine , Shanghai 201203, People's Republic of China
| | - Jian-Min Yue
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , 555 Zuchongzhi Road, Shanghai 201203, People's Republic of China
| |
Collapse
|
16
|
N. N, Thimmalapura VM, Hosamani B, Prabhu G, Kumar LR, Sureshbabu VV. Thioacids – synthons for amide bond formation and ligation reactions: assembly of peptides and peptidomimetics. Org Biomol Chem 2018; 16:3524-3552. [DOI: 10.1039/c8ob00512e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of α-amino thioacids and peptide thioacids and their applications in chemoselective amide bond formation, ligation of peptides/proteins/glycopeptides and synthesis of peptidomimetics are reviewed.
Collapse
Affiliation(s)
- Narendra N.
- Department of Chemistry
- University College of Science
- Tumkur University
- Tumkur 572 103
- India
| | - Vishwanatha M. Thimmalapura
- Room No. 109
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. Ambedkar Veedhi
| | - Basavaprabhu Hosamani
- Room No. 109
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. Ambedkar Veedhi
| | - Girish Prabhu
- Room No. 109
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. Ambedkar Veedhi
| | - L. Roopesh Kumar
- Room No. 109
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. Ambedkar Veedhi
| | - Vommina V. Sureshbabu
- Room No. 109
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. Ambedkar Veedhi
| |
Collapse
|
17
|
Mazuela J, Antonsson T, Johansson MJ, Knerr L, Marsden SP. Direct Synthesis of N-Alkyl Arylglycines by Organocatalytic Asymmetric Transfer Hydrogenation of N-Alkyl Aryl Imino Esters. Org Lett 2017; 19:5541-5544. [PMID: 28981292 DOI: 10.1021/acs.orglett.7b02627] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The organocatalytic asymmetric transfer hydrogenation of N-alkyl aryl imino esters for the direct synthesis of N-alkylated arylglycinate esters is reported. High yields and enantiomeric ratios were obtained, and tolerance to a diverse set of functional groups facilitated the preparation of more complex molecules as well as intermediates for active pharmaceuticals. A simple recycling protocol was developed for the Brønsted acid catalyst which could be reused through five cycles with no loss of activity or selectivity.
Collapse
Affiliation(s)
- Javier Mazuela
- Cardiovascular and Metabolic Diseases, Innovative Medicines and Early Development, AstraZeneca R&D, Pepparedsleden 1, Mölndal, SE-431 83, Sweden
| | - Thomas Antonsson
- Cardiovascular and Metabolic Diseases, Innovative Medicines and Early Development, AstraZeneca R&D, Pepparedsleden 1, Mölndal, SE-431 83, Sweden
| | - Magnus J Johansson
- Cardiovascular and Metabolic Diseases, Innovative Medicines and Early Development, AstraZeneca R&D, Pepparedsleden 1, Mölndal, SE-431 83, Sweden
| | - Laurent Knerr
- Cardiovascular and Metabolic Diseases, Innovative Medicines and Early Development, AstraZeneca R&D, Pepparedsleden 1, Mölndal, SE-431 83, Sweden
| | | |
Collapse
|
18
|
Johnson TC, Siegel D. Directing Stem Cell Fate: The Synthetic Natural Product Connection. Chem Rev 2017; 117:12052-12086. [PMID: 28771328 DOI: 10.1021/acs.chemrev.7b00015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Stem cells possess remarkable potential for the treatment of a broad array of diseases including many that lack therapeutic options. However, the use of cell-based products derived from stem cells as therapeutics has limitations including rejection, sufficient availability, and lack of appropriate engraftment. Chemical control of stem cells provides potential solutions for overcoming many of the current limitations in cell-based therapeutics. The development of exogenous molecules to control stem cell self-renewal or differentiation has arrived at natural product-based agents as an important class of modulators. The ex vivo production of cryopreserved cellular products for use in tissue repair is a relatively new area of medicine in which the conventional hurdles to implementing chemicals to effect human health are changed. Translational challenges centered on chemistry, such as pharmacokinetics, are reduced. Importantly, in many cases the desired human tissues can be evaluated against new chemicals, and approaches to cellular regulation can be validated in the clinically applicable system. As a result linking new and existing laboratory syntheses of natural products with findings of the compounds' unique abilities to regulate stem cell fate provides opportunities for developing improved methods for tissue manufacture, accessing probe compounds, and generating new leads that yield manufactured cells with improved properties. This review provides a summary of natural products that have shown promise in controlling stem cell fate and which have also been fully synthesized thereby providing chemistry platforms for further development.
Collapse
Affiliation(s)
- Trevor C Johnson
- Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093, United States
| | - Dionicio Siegel
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego , La Jolla, California 92093, United States
| |
Collapse
|
19
|
Yang J, Zhao J. Recent developments in peptide ligation independent of amino acid side-chain functional group. Sci China Chem 2017. [DOI: 10.1007/s11426-017-9056-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
20
|
Levinson AM, McGee JH, Roberts AG, Creech GS, Wang T, Peterson MT, Hendrickson RC, Verdine GL, Danishefsky SJ. Total Chemical Synthesis and Folding of All-l and All-d Variants of Oncogenic KRas(G12V). J Am Chem Soc 2017; 139:7632-7639. [PMID: 28448128 PMCID: PMC5606205 DOI: 10.1021/jacs.7b02988] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The Ras proteins are essential GTPases involved in the regulation of cell proliferation and survival. Mutated oncogenic forms of Ras alter effector binding and innate GTPase activity, leading to deregulation of downstream signal transduction. Mutated forms of Ras are involved in approximately 30% of human cancers. Despite decades of effort to develop direct Ras inhibitors, Ras has long been considered "undruggable" due to its high affinity for GTP and its lack of hydrophobic binding pockets. Herein, we report a total chemical synthesis of all-l- and all-d-amino acid biotinylated variants of oncogenic mutant KRas(G12V). The protein is synthesized using Fmoc-based solid-phase peptide synthesis and assembled using combined native chemical ligation and isonitrile-mediated activation strategies. We demonstrate that both KRas(G12V) enantiomers can successfully fold and bind nucleotide substrates and binding partners with observable enantiodiscrimination. By demonstrating the functional competency of a mirror-image form of KRas bound to its corresponding enantiomeric nucleotide triphosphate, this study sets the stage for further biochemical studies with this material. In particular, this protein will enable mirror-image yeast surface display experiments to identify all-d peptide ligands for oncogenic KRas, providing a useful tool in the search for new therapeutics against this challenging disease target.
Collapse
Affiliation(s)
- Adam M. Levinson
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Tri-Institutional PhD Program in Chemical Biology, Weill Cornell Medical College, New York, New York, United States of America
| | - John H. McGee
- Departments of Molecular and Cellular Biology, Stem Cell and Regenerative Biology, and Chemistry and Chemical Biology, Harvard University and Harvard Medical School, Cambridge, MA 02138
| | - Andrew G. Roberts
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
| | - Gardner S. Creech
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
| | - Ting Wang
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
| | - Michael T. Peterson
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
| | - Ronald C. Hendrickson
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
| | - Gregory L. Verdine
- Departments of Molecular and Cellular Biology, Stem Cell and Regenerative Biology, and Chemistry and Chemical Biology, Harvard University and Harvard Medical School, Cambridge, MA 02138
| | - Samuel J. Danishefsky
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States of America
- Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, New York 10027, United States of America
| |
Collapse
|
21
|
Price DA, Eng H, Farley KA, Goetz GH, Huang Y, Jiao Z, Kalgutkar AS, Kablaoui NM, Khunte B, Liras S, Limberakis C, Mathiowetz AM, Ruggeri RB, Quan JM, Yang Z. Comparative pharmacokinetic profile of cyclosporine (CsA) with a decapeptide and a linear analogue. Org Biomol Chem 2017; 15:2501-2506. [PMID: 28266673 DOI: 10.1039/c7ob00096k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The synthesis and in vivo pharmacokinetic profile of an analogue of cyclosporine is disclosed. An acyclic congener was also profiled in in vitro assays to compare cell permeability. The compounds possess similar calculated and measured molecular descriptors however have different behaviors in an RRCK assay to assess cell permeability.
Collapse
Affiliation(s)
- David A Price
- Pfizer Inc. Medicine Design, 610 Main Street, Cambridge, Massachusetts, 02155 USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Zhao G, Xu G, Qian C, Tang W. Efficient Enantioselective Syntheses of (+)-Dalesconol A and B. J Am Chem Soc 2017; 139:3360-3363. [DOI: 10.1021/jacs.7b00783] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guoqing Zhao
- State Key Laboratory of Bio-Organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai 200032, China
| | - Guangqing Xu
- State Key Laboratory of Bio-Organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai 200032, China
| | - Chao Qian
- State Key Laboratory of Bio-Organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai 200032, China
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai 200032, China
| |
Collapse
|
23
|
Abstract
The present review offers an overview of nonclassical (e.g., with no pre- or in situ activation of a carboxylic acid partner) approaches for the construction of amide bonds. The review aims to comprehensively discuss relevant work, which was mainly done in the field in the last 20 years. Organization of the data follows a subdivision according to substrate classes: catalytic direct formation of amides from carboxylic and amines ( section 2 ); the use of carboxylic acid surrogates ( section 3 ); and the use of amine surrogates ( section 4 ). The ligation strategies (NCL, Staudinger, KAHA, KATs, etc.) that could involve both carboxylic acid and amine surrogates are treated separately in section 5 .
Collapse
Affiliation(s)
- Renata Marcia de Figueiredo
- Institut Charles Gerhardt de Montpellier (ICGM), UMR 5253-CNRS-UM-ENSCM, Ecole Nationale Supérieure de Chimie , 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Jean-Simon Suppo
- Institut Charles Gerhardt de Montpellier (ICGM), UMR 5253-CNRS-UM-ENSCM, Ecole Nationale Supérieure de Chimie , 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Jean-Marc Campagne
- Institut Charles Gerhardt de Montpellier (ICGM), UMR 5253-CNRS-UM-ENSCM, Ecole Nationale Supérieure de Chimie , 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| |
Collapse
|
24
|
Hutton CA, Shang J, Wille U. Synthesis of Peptides by Silver-Promoted Coupling of Carboxylates and Thioamides: Mechanistic Insight from Computational Studies. Chemistry 2016; 22:3163-9. [PMID: 26813415 DOI: 10.1002/chem.201503753] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Indexed: 11/05/2022]
Abstract
The mechanism of the recently described N→C direction peptide synthesis through silver-promoted coupling of N-protected amino acids with thioacetylated amino esters was explored by using density functional theory. Calculation of the potential energy surfaces for various pathways revealed that the reaction proceeds through silver-assisted addition of the carboxylate to the thioamide, which is followed by deprotonation and silver-mediated extrusion of sulfur as Ag2 S. The resulting isoimide is the key intermediate, which subsequently rearranges to an imide through a concerted pericyclic [1,3]-acyl shift (O-sp(2) N 1,3-acyl migration). The proposed mechanism clearly emphasises the requirement of two equivalents of Ag(I) and basic reaction conditions, which is in full agreement with the experimental findings. Alternative rearrangement pathways involving only one equivalent of Ag(I) or through O-sp(3) N 1,3-acyl migration can be excluded. The computations further revealed that peptide couplings involving thioformamides require significant conformational changes in the intermediate isoformimide, which slow down the rearrangement process.
Collapse
Affiliation(s)
- Craig A Hutton
- School of Chemistry and Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, VIC, 3010, Australia.
| | - Jing Shang
- School of Chemistry and Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, VIC, 3010, Australia
| | - Uta Wille
- School of Chemistry and Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, VIC, 3010, Australia.
| |
Collapse
|
25
|
Duttagupta I, Ghosh K, Sinha S. Synthetic Studies Toward Nonribosomal Peptides. STUDIES IN NATURAL PRODUCTS CHEMISTRY 2016. [DOI: 10.1016/b978-0-444-63602-7.00002-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
26
|
Roberts AG, Johnston EV, Shieh JH, Sondey JP, Hendrickson RC, Moore MAS, Danishefsky SJ. Fully Synthetic Granulocyte Colony-Stimulating Factor Enabled by Isonitrile-Mediated Coupling of Large, Side-Chain-Unprotected Peptides. J Am Chem Soc 2015; 137:13167-75. [PMID: 26401918 PMCID: PMC4617663 DOI: 10.1021/jacs.5b08754] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Human granulocyte colony-stimulating factor (G-CSF) is an endogenous glycoprotein involved in hematopoiesis. Natively glycosylated and nonglycosylated recombinant forms, lenograstim and filgrastim, respectively, are used clinically to manage neutropenia in patients undergoing chemotherapeutic treatment. Despite their comparable therapeutic potential, the purpose of O-linked glycosylation at Thr133 remains a subject of controversy. In light of this, we have developed a synthetic platform to prepare G-CSF aglycone with the goal of enabling access to native and designed glycoforms with site-selectivity and glycan homogeneity. To address the synthesis of a relatively large, aggregation-prone sequence, we advanced an isonitrile-mediated ligation method. The chemoselective activation and coupling of C-terminal peptidyl Gly thioacids with the N-terminus of an unprotected peptide provide ligated peptides directly in a manner complementary to that with conventional native chemical ligation-desulfurization strategies. Herein, we describe the details and application of this method as it enabled the convergent total synthesis of G-CSF aglycone.
Collapse
Affiliation(s)
- Andrew G. Roberts
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
| | - Eric V. Johnston
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
| | - Jae-Hung Shieh
- Cell Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
| | - Joseph P. Sondey
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
| | - Ronald C. Hendrickson
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
| | - Malcolm A. S. Moore
- Cell Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
| | - Samuel J. Danishefsky
- Laboratory for Bio-Organic Chemistry, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
- Chemical Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
- Cell Biology Program, Sloan Kettering Institute (SKI) for Cancer Research, New York, New York 10065, United States
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| |
Collapse
|
27
|
Fernández-Llamazares AI, Spengler J, Albericio F. Review backboneN-modified peptides: How to meet the challenge of secondary amine acylation. Biopolymers 2015; 104:435-52. [DOI: 10.1002/bip.22696] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 05/21/2015] [Accepted: 05/26/2015] [Indexed: 12/29/2022]
Affiliation(s)
- Ana I. Fernández-Llamazares
- Institute for Research in Biomedicine; Deparment of Chemistry and Molecular Pharmacology, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
| | - Jan Spengler
- Institute for Research in Biomedicine; Deparment of Chemistry and Molecular Pharmacology, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
| | - Fernando Albericio
- Institute for Research in Biomedicine; Deparment of Chemistry and Molecular Pharmacology, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- Department of Organic Chemistry; University of Barcelona; Martí i Franquès 1-11 Barcelona 08028 Spain
- School of Chemistry and Physics; University of KwaZulu-Natal; 4001 Durban South Africa
- School of Life Sciences, Department of Chemistry, Yachay Tech, Yachay City of Knowledge; Urcuquι 100119 Ecuador. Department of Chemistry; College of Science, King Saud University; P.O. Box 2455 Riyadh 11451 Saudi Arabia
| |
Collapse
|
28
|
Copper-catalyzed oxidative amidation between aldehydes and arylamines under mild conditions. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.113] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
29
|
Maharani R, Sleebs BE, Hughes AB. Macrocyclic N-Methylated Cyclic Peptides and Depsipeptides. STUDIES IN NATURAL PRODUCTS CHEMISTRY 2015. [DOI: 10.1016/b978-0-444-63460-3.00004-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
30
|
Fan YY, Zhang H, Zhou Y, Liu HB, Tang W, Zhou B, Zuo JP, Yue JM. Phainanoids A–F, A New Class of Potent Immunosuppressive Triterpenoids with an Unprecedented Carbon Skeleton from Phyllanthus hainanensis. J Am Chem Soc 2014; 137:138-41. [DOI: 10.1021/ja511813g] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Yao-Yue Fan
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Hua Zhang
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Yu Zhou
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Hong-Bing Liu
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Wei Tang
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Bin Zhou
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Jian-Ping Zuo
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| | - Jian-Min Yue
- State Key Laboratory of Drug Research,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China
| |
Collapse
|
31
|
Khaybullin RN, Panda SS, Mirzai S, Toneff E, Asiri AM, Hall CD, Katritzky AR. Arginine thioacid in synthesis of arginine conjugates and peptides. RSC Adv 2014. [DOI: 10.1039/c4ra04897k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
|
32
|
He W, Qiu HB, Chen YJ, Xi J, Yao ZJ. Total synthesis of proposed structure of coibamide A, a highly N- and O-methylated cytotoxic marine cyclodepsipeptide. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.09.047] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
33
|
|
34
|
Chandra K, Roy TK, Shalev DE, Loyter A, Gilon C, Gerber RB, Friedler A. A tandem in situ peptide cyclization through trifluoroacetic acid cleavage. Angew Chem Int Ed Engl 2014; 53:9450-5. [PMID: 24827640 DOI: 10.1002/anie.201402789] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Indexed: 12/31/2022]
Abstract
We present a new approach for peptide cyclization during solid phase synthesis under highly acidic conditions. Our approach involves simultaneous in situ deprotection, cyclization and trifluoroacetic acid (TFA) cleavage of the peptide, which is achieved by forming an amide bond between a lysine side chain and a succinic acid linker at the peptide N-terminus. The reaction proceeds via a highly active succinimide intermediate, which was isolated and characterized. The structure of a model cyclic peptide was solved by NMR spectroscopy. Theoretical calculations support the proposed mechanism of cyclization. Our new methodology is applicable for the formation of macrocycles in solid-phase synthesis of peptides and organic molecules.
Collapse
Affiliation(s)
- Koushik Chandra
- Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assaf
| | | | | | | | | | | | | |
Collapse
|
35
|
Chandra K, Roy TK, Shalev DE, Loyter A, Gilon C, Gerber RB, Friedler A. A Tandem In Situ Peptide Cyclization through Trifluoroacetic Acid Cleavage. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402789] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
36
|
Bai J, Zambroń BK, Vogel P. Amides in One Pot from Carboxylic Acids and Amines via Sulfinylamides. Org Lett 2014; 16:604-7. [DOI: 10.1021/ol403508j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Jianfei Bai
- Laboratoire de Glycochimie
et de Synthèse Asymétrique, Swiss Federal Institute of Technology (EPFL), Batochime, CH 1015 Lausanne, Switzerland
| | - Bartosz K. Zambroń
- Laboratoire de Glycochimie
et de Synthèse Asymétrique, Swiss Federal Institute of Technology (EPFL), Batochime, CH 1015 Lausanne, Switzerland
| | - Pierre Vogel
- Laboratoire de Glycochimie
et de Synthèse Asymétrique, Swiss Federal Institute of Technology (EPFL), Batochime, CH 1015 Lausanne, Switzerland
| |
Collapse
|
37
|
Abstract
Natural products, their derivatives or compounds based on natural product leads constitute ~50 % of clinically used pharmaceuticals. This review highlights pharmaceuticals currently used in Australia and New Zealand that have their origins in fungal metabolites, discussing the natural products chemistry and medicinal chemistry leading to their application as pharmaceuticals.
Collapse
|
38
|
Guan X, Chaffey PK, Zeng C, Tan Z. New Methods for Chemical Protein Synthesis. Top Curr Chem (Cham) 2014; 363:155-92. [DOI: 10.1007/128_2014_599] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
39
|
Pourvali A, Cochrane JR, Hutton CA. A new method for peptide synthesis in the N→C direction: amide assembly through silver-promoted reaction of thioamides. Chem Commun (Camb) 2014; 50:15963-6. [DOI: 10.1039/c4cc07601j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Ag(i)-promoted coupling of peptide-acids with thioamides generates peptide-imides, which was exploited in the synthesis of peptides in the N→C direction.
Collapse
Affiliation(s)
- Aysa Pourvali
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- , Australia
| | - James R. Cochrane
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- , Australia
| | - Craig A. Hutton
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- , Australia
| |
Collapse
|
40
|
Huang L, Guo H, Pan L, Xie C. Synthesis of Amides by Palladium-Catalyzed Decarbonylative Coupling of Carboxylic Acids with Isocyanides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300982] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
41
|
Solid-phase peptide synthesis and solid-phase fragment coupling mediated by isonitriles. Proc Natl Acad Sci U S A 2013; 110:11708-13. [PMID: 23821753 DOI: 10.1073/pnas.1310431110] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The synthesis of polypeptides on solid phase via mediation by isonitriles is described. The acyl donor is a thioacid, which presumably reacts with the isonitrile to generate a thio-formimidate carboxylate mixed anhydride intermediate. Applications of this chemistry to reiterative solid-phase peptide synthesis as well as solid-phase fragment coupling are described.
Collapse
|
42
|
Fécourt F, Delpech B, Melnyk O, Crich D. Se-(9-Fluorenylmethyl) Selenoesters; Preparation, Reactivity, and Use as Convenient Synthons for Selenoacids. Org Lett 2013; 15:3758-61. [DOI: 10.1021/ol401677a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Fabien Fécourt
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France, CNRS UMR 8161, Univ. Lille Nord de France, Institut Pasteur de Lille, 59021, Lille, France, and Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Bernard Delpech
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France, CNRS UMR 8161, Univ. Lille Nord de France, Institut Pasteur de Lille, 59021, Lille, France, and Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Oleg Melnyk
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France, CNRS UMR 8161, Univ. Lille Nord de France, Institut Pasteur de Lille, 59021, Lille, France, and Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - David Crich
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France, CNRS UMR 8161, Univ. Lille Nord de France, Institut Pasteur de Lille, 59021, Lille, France, and Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| |
Collapse
|
43
|
Chandrasekhar S, Rajesh G, Naresh T. Enantioselective synthesis of the C5–C23 segment of biselyngbyaside. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2012.11.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
44
|
Konar AD. The unique crystallographic signature of a β-turn mimic nucleated by N-methylated phenylalanine and Aib as corner residue: conformational and self-assembly studies. CrystEngComm 2013. [DOI: 10.1039/c3ce41448e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
45
|
Polisar JG, Norton JR. On the reaction of carboxylic acids and isonitriles with conventional heating. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.09.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
46
|
Chatterjee J, Rechenmacher F, Kessler H. N-methylation of peptides and proteins: an important element for modulating biological functions. Angew Chem Int Ed Engl 2012; 52:254-69. [PMID: 23161799 DOI: 10.1002/anie.201205674] [Citation(s) in RCA: 352] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Indexed: 11/06/2022]
Abstract
N-Methylation is one of the simplest chemical modifications often occurring in peptides and proteins of prokaryotes and higher eukaryotes. Over years of evolution, nature has employed N-methylation of peptides as an ingenious technique to modulate biological function, often as a mode of survival through the production of antibiotics. This small structural change can not only mobilize large protein complexes (as in the histone methylation), but also inhibits the action of enzymes by selective recognition of protein-protein interaction surfaces. In recent years through the advancement in synthetic approaches, the potential of N-methylation has begun to be revealed, not only in modulating biological activity and selectivity as well as pharmacokinetic properties of peptides, but also in delivering novel drugs. Herein, we summarize the current knowledge of the versatility of N-methylation in modulating biological, structural, and pharmacokinetic properties of peptides.
Collapse
Affiliation(s)
- Jayanta Chatterjee
- Genome biology unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | | | | |
Collapse
|
47
|
Chatterjee J, Rechenmacher F, Kessler H. N-Methylierung von Peptiden und Proteinen: ein wichtiges Element für die Regulation biologischer Funktionen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205674] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
48
|
Araujo-Andrade C, Giuliano BM, Gómez-Zavaglia A, Fausto R. Structure and UV-induced photochemistry of 2-furaldehyde dimethylhydrazone isolated in rare gas matrices. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 97:830-837. [PMID: 22902581 DOI: 10.1016/j.saa.2012.07.061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Revised: 07/11/2012] [Accepted: 07/13/2012] [Indexed: 06/01/2023]
Abstract
In this work, a combined matrix isolation FTIR and theoretical DFT(B3LYP)/6-311++G(d,p) study of 2-furaldehyde dimethylhydrazone (2FDH) was performed. According to calculations, two E and two Z conformers exist, the E forms having considerably lower energy than the Z forms. The absence of relevant sterical hindrance between the two substituents around the CN bond (dimethylamino and 2-furyl) in the E structures and an extended π-p electron delocalization in the hydrazone moiety determines the higher stability of these species relatively to the Z structures. In the lowest energy form (E-AG) the O-C-CN and CN-N-Lp (Lp=lone electron pair of amine nitrogen atom) dihedral angles are predicted by the calculations to be -177.2° and 93.7°, respectively. The weak (NC)-H⋯O hydrogen bond type interaction (H⋯O distance: 252.2 pm) in form E-AG, together with the absence in this form of the destabilizing interaction between the lone electron pairs of the oxygen and nitrogen atoms existing in E-SG, explains its lower energy in comparison with this latter form. Both E-AG and E-SG conformers could be trapped from room temperature gas phase in low temperature argon and xenon matrices. The high E-SG→E-AG energy barrier (>25 kJ mol(-1)) explains that, upon increasing the temperature of the matrices no conformational isomerization could be observed. After irradiation of 2FDH with UV-light at λ>328 and λ>234 nm, two different photochemistries were observed. Irradiation at lower energy (λ>328nm) induced the E-AG→E-SG isomerization. Further irradiation at higher energy (λ>234 nm) led to a quick consumption of 2FDH and production of furan and dimethylisocyanide.
Collapse
Affiliation(s)
- C Araujo-Andrade
- Unidad Académica de Física de la Universidad Autónoma de Zacatecas, Zacatecas, Mexico
| | | | | | | |
Collapse
|
49
|
Hemantha HP, Narendra N, Sureshbabu VV. Total chemical synthesis of polypeptides and proteins: chemistry of ligation techniques and beyond. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.08.059] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
50
|
Haj-Yahya M, Eltarteer N, Ohayon S, Shema E, Kotler E, Oren M, Brik A. N-methylation of isopeptide bond as a strategy to resist deubiquitinases. Angew Chem Int Ed Engl 2012; 51:11535-9. [PMID: 23065695 DOI: 10.1002/anie.201205771] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 08/23/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Mahmood Haj-Yahya
- Department of Chemistry, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | | | | | | | | | | | | |
Collapse
|