1
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Umeno T, Ueda A, Doi M, Kato T, Oba M, Tanaka M. Helical foldamer-catalyzed enantioselective 1,4-addition reaction of dialkyl malonates to cyclic enones. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.151301] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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2
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Koba Y, Ueda A, Oba M, Doi M, Kato T, Demizu Y, Tanaka M. Left-Handed Helix of Three-Membered Ring Amino Acid Homopeptide Interrupted by an N-H···Ethereal O-Type Hydrogen Bond. Org Lett 2018; 20:7830-7834. [PMID: 30499676 DOI: 10.1021/acs.orglett.8b03331] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A chiral three-membered ring Cα,α-disubstituted α-amino acid ( R, R)-Ac3cdMOM, in which the α-carbon is not a chiral center, but two side chain β-carbons are chiral centers, was synthesized from dimethyl l-(+)-tartrate, and its homopeptides were prepared. X-ray crystallographic analysis of ( R, R)-Ac3cdMOM pentapeptide showed bent left-handed ( M) 310-helical structures with an unusual intramolecular hydrogen bond of the N-H···O (ethereal) type. The left-handedness of the bent helices was exclusively controlled by the side-chain β-carbon chiral centers.
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Affiliation(s)
- Yurie Koba
- Graduate School of Biomedical Sciences , Nagasaki University , 1-14 Bukyo-machi , Nagasaki 852-8521 , Japan
| | - Atsushi Ueda
- Graduate School of Biomedical Sciences , Nagasaki University , 1-14 Bukyo-machi , Nagasaki 852-8521 , Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences , Nagasaki University , 1-14 Bukyo-machi , Nagasaki 852-8521 , Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences , Osaka 569-1094 , Japan
| | - Takuma Kato
- Osaka University of Pharmaceutical Sciences , Osaka 569-1094 , Japan
| | - Yosuke Demizu
- Division of Organic Chemistry , National Institute of Health Sciences , Kawasaki 210-9501 , Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences , Nagasaki University , 1-14 Bukyo-machi , Nagasaki 852-8521 , Japan
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3
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Tsuji G, Misawa T, Doi M, Demizu Y. Extent of Helical Induction Caused by Introducing α-Aminoisobutyric Acid into an Oligovaline Sequence. ACS OMEGA 2018; 3:6395-6399. [PMID: 31458822 PMCID: PMC6644412 DOI: 10.1021/acsomega.8b01030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 06/05/2018] [Indexed: 06/10/2023]
Abstract
The preferred conformations of a dodecapeptide composed of l-valine (l-Val) and α-aminoisobutyric acid (Aib) residues, Boc-(l-Val-l-Val-Aib)4-OMe (3), were analyzed in solution and in the crystalline state. Peptide 3 predominantly folded into a mixture of α- and 310-(P) helical structures in solution and a (P) α helix in the crystalline state.
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Affiliation(s)
- Genichiro Tsuji
- Division
of Organic Chemistry, National Institute
of Health Sciences, Kanagawa 210-9501, Japan
| | - Takashi Misawa
- Division
of Organic Chemistry, National Institute
of Health Sciences, Kanagawa 210-9501, Japan
| | - Mitsunobu Doi
- Osaka
University of Pharmaceutical Sciences, Osaka 569-1094, Japan
| | - Yosuke Demizu
- Division
of Organic Chemistry, National Institute
of Health Sciences, Kanagawa 210-9501, Japan
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4
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Koba Y, Ueda A, Oba M, Doi M, Demizu Y, Kurihara M, Tanaka M. Helical l
-Leu-Based Peptides Having Chiral Five-Membered Carbocyclic Ring Amino Acids with an Ethylene Acetal Moiety. ChemistrySelect 2017. [DOI: 10.1002/slct.201700832] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yurie Koba
- Graduate School of Biomedical Sciences; Nagasaki University, 1-14 Bunkyo-machi; Nagasaki 852-8521 Japan
| | - Atsushi Ueda
- Graduate School of Biomedical Sciences; Nagasaki University, 1-14 Bunkyo-machi; Nagasaki 852-8521 Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences; Nagasaki University, 1-14 Bunkyo-machi; Nagasaki 852-8521 Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences; Osaka 569-1094 Japan
| | - Yosuke Demizu
- Division of Organic Chemistry; National Institute of Health Sciences; Tokyo 158-8501 Japan
| | - Masaaki Kurihara
- Graduate School of Pharmaceutical Sciences; International University of Health and Welfare; Ohtawara 324-8501 Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences; Nagasaki University, 1-14 Bunkyo-machi; Nagasaki 852-8521 Japan
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5
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Koba Y, Hirata Y, Ueda A, Oba M, Doi M, Demizu Y, Kurihara M, Tanaka M. Synthesis of chiral five-membered carbocyclic ring amino acids with an acetal moiety and helical conformations of its homo-chiral homopeptides. Biopolymers 2017; 106:555-62. [PMID: 26566886 DOI: 10.1002/bip.22769] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 11/02/2015] [Indexed: 01/11/2023]
Abstract
Chiral five-membered carbocyclic ring amino acids bearing various diol acetal moieties were synthesized starting from l-malic acid, and homo-chiral homopeptides composed of cyclic amino acid (S)-Ac5 c(3EG) bearing an ethylene glycol acetal, up to an octapeptide, were prepared. A conformational analysis revealed that (S)-Ac5 c(3EG) homopeptides formed helical structures. (S)-Ac5 c(3EG) homopeptides, up to hexapeptides, formed helical structures without controlling the helical screw direction, while (S)-Ac5 c(3EG) hepta- and octapeptides formed helical structures with a preference for the left-handed (M) helical-screw direction. © 2015 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 555-562, 2016.
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Affiliation(s)
- Yurie Koba
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
| | - Yoko Hirata
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
| | - Atsushi Ueda
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences, Osaka, 569-1094, Japan
| | - Yosuke Demizu
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, 158-8501, Japan
| | - Masaaki Kurihara
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, 158-8501, Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
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6
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Demizu Y, Okitsu K, Doi M, Misawa T, Oba M, Tanaka M, Kurihara M. Influence of L-Leu to D-Leu Replacement on the Helical Secondary Structures of L-Leu-Aib-Based Dodecapeptides. ChemistrySelect 2016. [DOI: 10.1002/slct.201601493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yosuke Demizu
- National Institute of Health Sciences; Setagaya Tokyo 158-8501 Japan
| | - Koyo Okitsu
- National Institute of Health Sciences; Setagaya Tokyo 158-8501 Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences; Osaka 569-1094 Japan
| | - Takashi Misawa
- National Institute of Health Sciences; Setagaya Tokyo 158-8501 Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences, Nagasaki University; Nagasaki 852-8521 Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences, Nagasaki University; Nagasaki 852-8521 Japan
| | - Masaaki Kurihara
- National Institute of Health Sciences; Setagaya Tokyo 158-8501 Japan
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7
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Umeno T, Ueda A, Oba M, Doi M, Hirata T, Suemune H, Tanaka M. Helical structures of l-Leu-based peptides having chiral six-membered ring amino acids. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.04.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Demizu Y, Doi M, Yamashita H, Misawa T, Oba M, Kurihara M, Suemune H, Tanaka M. The side-chain hydroxy groups of a cyclic α,α-disubstituted α-amino acid promote oligopeptide 310 -helix packing in the crystalline state. Biopolymers 2016; 106:757-68. [PMID: 27237543 DOI: 10.1002/bip.22881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/09/2016] [Accepted: 05/23/2016] [Indexed: 01/08/2023]
Abstract
A single chiral cyclic α,α-disubstituted amino acid with side-chain methoxymethyl (MOM) protecting groups, (3S,4S)-1-amino-(3,4-dimethoxymethoxy)cyclopentanecarboxylic acid [(S, S)-Ac5 c(dOMOM) ], or side-chain hydroxy groups, (3S,4S)-1-amino-(3,4-dihydroxy)cyclopentanecarboxylic acid [(S, S)-Ac5 c(dOH) ], was attached to the N-terminal or C-terminal position of α-aminoisobutyric acid (Aib) tetrapeptide segments; i.e., we designed and synthesized four pentapeptides, Cbz-[(S, S)-Ac5 c(dOMOM) ]-(Aib)4 -OEt (1), Cbz-[(S, S)-Ac5 c(dOH) ]-(Aib)4 -OEt (2), Cbz-(Aib)4 -[(S, S)-Ac5 c(dOMOM) ]-OMe (3), and Cbz-(Aib)4 -[(S, S)-Ac5 c(dOH) ]-OMe (4). We then analyzed the peptides' structures in the crystalline state. The four peptides all folded into 310 -helical structures; 1 formed a left-handed (M) 310 -helix, 2 formed a mixture of right-handed (P) and (M) 310 -helices, 3 formed a mixture of (P) and (M) 310 -helices, and 4 formed a (P) 310 -helix, respectively. In packing mode, the molecules of peptides 1 and 3, which both possessed an Ac5 c(dOMOM) residue, were connected by intermolecular hydrogen bonds along the peptide backbone (NH···O type). On the other hand, the packing of peptides 2 and 4, which both contained an Ac5 c(dOH) residue, was based on intermolecular hydrogen bonds derived from both the peptide backbone and the side-chain hydroxy groups of the amino acid Ac5 c(dOH) (OH···O type). © 2016 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 757-768, 2016.
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Affiliation(s)
- Yosuke Demizu
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, 158-8501, Japan.
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences, Osaka, 569-1094, Japan
| | - Hiroko Yamashita
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, 158-8501, Japan
| | - Takashi Misawa
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, 158-8501, Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
| | - Masaaki Kurihara
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, 158-8501, Japan
| | - Hiroshi Suemune
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan
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9
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Demizu Y, Okitsu K, Yamashita H, Doi M, Misawa T, Oba M, Tanaka M, Kurihara M. α-Helical Structures of Oligopeptides with an Alternating l-Leu-Aib Segment. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600327] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yosuke Demizu
- National Institute of Health Sciences; Setagaya 158-8501 Tokyo Japan
| | - Koyo Okitsu
- National Institute of Health Sciences; Setagaya 158-8501 Tokyo Japan
| | - Hiroko Yamashita
- National Institute of Health Sciences; Setagaya 158-8501 Tokyo Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences; 569-1094 Osaka Japan
| | - Takashi Misawa
- National Institute of Health Sciences; Setagaya 158-8501 Tokyo Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences; Nagasaki University; 852-8521 Nagasaki Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences; Nagasaki University; 852-8521 Nagasaki Japan
| | - Masaaki Kurihara
- National Institute of Health Sciences; Setagaya 158-8501 Tokyo Japan
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10
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Demizu Y, Yamashita H, Misawa T, Doi M, Oba M, Tanaka M, Kurihara M. Handedness Preferences of Heterochiral Helical Peptides Containing Homochiral Peptide Segments. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501146] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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11
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Demizu Y, Yamashita H, Doi M, Misawa T, Oba M, Tanaka M, Kurihara M. Topological Study of the Structures of Heterochiral Peptides Containing Equal Amounts of l-Leu and d-Leu. J Org Chem 2015; 80:8597-603. [PMID: 26274390 DOI: 10.1021/acs.joc.5b01541] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We designed and synthesized two dodecapeptides, Boc-(l-Leu-l-Leu-Aib-d-Leu-d-Leu-Aib)2-OMe (5) and Boc-l-Leu-l-Leu-Aib-(d-Leu-d-Leu-Aib)2-l-Leu-l-Leu-Aib-OMe (6), that contain equal amounts of l-Leu, d-Leu, and achiral Aib residues. The conformations of peptides 5 and 6 in the crystalline state were studied using X-ray crystallographic analysis. Peptide 5 formed a left-handed (M) α-helical structure, whereas peptide 6 was composed of a combination of fused (M) α-helical and right-handed (P) 310-helical structures. In solution, roughly equivalent amounts of (P) and (M) helices were present in 5, whereas the (M) α-helix was present in 6 as its dominant conformation.
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Affiliation(s)
- Yosuke Demizu
- Division of Organic Chemistry, National Institute of Health Sciences , Tokyo 158-8501, Japan
| | - Hiroko Yamashita
- Division of Organic Chemistry, National Institute of Health Sciences , Tokyo 158-8501, Japan.,Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology , Yokohama 226-8501, Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences , Osaka 569-1094, Japan
| | - Takashi Misawa
- Division of Organic Chemistry, National Institute of Health Sciences , Tokyo 158-8501, Japan
| | - Makoto Oba
- Graduate School of Biomedical Sciences, Nagasaki University , Nagasaki 852-8521, Japan
| | - Masakazu Tanaka
- Graduate School of Biomedical Sciences, Nagasaki University , Nagasaki 852-8521, Japan
| | - Masaaki Kurihara
- Division of Organic Chemistry, National Institute of Health Sciences , Tokyo 158-8501, Japan.,Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology , Yokohama 226-8501, Japan
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12
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Hirata T, Ueda A, Oba M, Doi M, Demizu Y, Kurihara M, Nagano M, Suemune H, Tanaka M. Amino equatorial effect of a six-membered ring amino acid on its peptide 310- and α-helices. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.02.075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Yamashita H, Demizu Y, Misawa T, Shoda T, Kurihara M. Synthesis of a bis-cationic α,α-disubstituted amino acid (9-amino-bispidine-9-carboxylic acid) and its effects on the conformational properties of peptides. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.02.076] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Demizu Y, Yamashita H, Misawa T, Doi M, Tanaka M, Kurihara M. Effects of D-Leu Residues on the Helical Secondary Structures of L-Leu-Based Nonapeptides. Chem Pharm Bull (Tokyo) 2015; 63:218-24. [DOI: 10.1248/cpb.c14-00760] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yosuke Demizu
- Division of Organic Chemistry, National Institute of Health Sciences
| | - Hiroko Yamashita
- Division of Organic Chemistry, National Institute of Health Sciences
- Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology
| | - Takashi Misawa
- Division of Organic Chemistry, National Institute of Health Sciences
| | | | | | - Masaaki Kurihara
- Division of Organic Chemistry, National Institute of Health Sciences
- Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology
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15
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Oba M, Takazaki H, Kawabe N, Doi M, Demizu Y, Kurihara M, Kawakubo H, Nagano M, Suemune H, Tanaka M. Helical Peptide-Foldamers Having a Chiral Five-Membered Ring Amino Acid with Two Azido Functional Groups. J Org Chem 2014; 79:9125-40. [DOI: 10.1021/jo501493x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Makoto Oba
- Graduate
School of Biomedical Sciences, Nagasaki University, 1-14 Bukyo-machi, Nagasaki 852-8521, Japan
| | - Hiroomi Takazaki
- Graduate
School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Naomi Kawabe
- Graduate
School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences, Osaka 569-1094, Japan
| | - Yosuke Demizu
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Masaaki Kurihara
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Hiromu Kawakubo
- Department
of Pharmaceutical Sciences, Nihon Pharmaceutical University, Saitama 362-0806, Japan
| | - Masanobu Nagano
- Graduate
School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Hiroshi Suemune
- Graduate
School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Masakazu Tanaka
- Graduate
School of Biomedical Sciences, Nagasaki University, 1-14 Bukyo-machi, Nagasaki 852-8521, Japan
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16
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Wright K, d'Aboville E, Scola J, Margola T, Toffoletti A, De Zotti M, Crisma M, Formaggio F, Toniolo C. A Quaternary Nitronyl Nitroxide α-Amino Acid: Synthesis, Configurational and Conformational Assignments, and Physicochemical Properties. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301765] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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17
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Demizu Y, Yamashita H, Yamazaki N, Sato Y, Doi M, Tanaka M, Kurihara M. Oligopeptides with Equal Amounts of l- and d-Amino Acids May Prefer a Helix Screw Sense. J Org Chem 2013; 78:12106-13. [DOI: 10.1021/jo402133e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Yosuke Demizu
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Hiroko Yamashita
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
- Graduate
School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Norikazu Yamazaki
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Yukiko Sato
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Mitsunobu Doi
- Osaka
University of Pharmaceutical Sciences, Osaka 569-1094, Japan
| | - Masakazu Tanaka
- Graduate
School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan
| | - Masaaki Kurihara
- Division
of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan
- Graduate
School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
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18
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Anan K, Demizu Y, Oba M, Kurihara M, Doi M, Suemune H, Tanaka M. Helical Structures of Bicyclicα-Amino Acid Homochiral Oligomers with the Stereogenic Centers at the Side-Chain Fused-Ring Junctions. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201200403] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Demizu Y, Doi M, Kurihara M, Maruyama T, Suemune H, Tanaka M. One-Handed Helical Screw Direction of Homopeptide Foldamer Exclusively Induced by Cyclic α-Amino Acid Side-Chain Chiral Centers. Chemistry 2012; 18:2430-9. [DOI: 10.1002/chem.201102902] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Indexed: 11/11/2022]
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20
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Design, conformational studies and analysis of structure-function relationships of PTH (1-11) analogues: the essential role of Val in position 2. Amino Acids 2011; 43:207-18. [PMID: 21918876 DOI: 10.1007/s00726-011-1065-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 08/24/2011] [Indexed: 10/17/2022]
Abstract
The N-terminal 1-34 segment of parathyroid hormone (PTH) is fully active in vitro and in vivo and it elicits all the biological responses characteristic of the native intact PTH. Recent studies reported potent helical analogues of the PTH (1-11) with helicity-enhancing substitutions. This work describes the synthesis, biological activity, and conformational studies of analogues obtained from the most active non-natural PTH (1-11) peptide H-Aib-Val-Aib-Glu-Ile-Gln-Leu-Nle-His-Gln-Har-NH2; specifically, the replacement of Val in position 2 with D-Val, L-(αMe)-Val and N-isopropyl-Gly was studied. The synthesized analogues were characterized functionally by in-cell assays and their structures were determined by CD and NMR spectroscopy. To clarify the relationship between the structure and activity, the structural data were used to generate a pharmacophoric model, obtained overlapping all the analogues. This model underlines the fundamental functional role of the side chain of Val2 and, at the same time, reveals that the introduction of conformationally constrained Cα-tetrasubstituted α-amino acids in the peptides increases their helical content, but does not necessarily ensure significant biological activity.
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21
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Nagano M, Tanaka M, Doi M, Demizu Y, Kurihara M, Suemune H. Helical-screw directions of diastereoisomeric cyclic alpha-amino acid oligomers. Org Lett 2010; 11:1135-7. [PMID: 19191578 DOI: 10.1021/ol802963a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two series of homooligomers composed of diastereoisomeric cyclic alpha-amino acids having two chiral centers at the alpha-carbon and the side chain were synthesized, and their preferred secondary structures were studied in solution and in the crystal state. The oligomers are a new class of helical-foldamers possessing two kinds of chiral centers on the helical backbone and at the lateral surface of the helix.
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Affiliation(s)
- Masanobu Nagano
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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22
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Abstract
Abstract
The molecular and crystal structures of the terminally blocked homo-tri- and homo-pentapeptides from 1-amino-1-cyclopentane-carboxylic acid, Z-(Ac5c)3-OtBu (1) and Z-(Ac5c)5-OtBu (2), were determined by X-ray diffraction. The two compounds exhibit the following parameters: (1) orthorhombic, P212121, a = 11.539(7) Å, b = 16.185(2) Å, c = 30.925(4) Å and Z = 8; (2) triclinic, P[unk], a = 10.835(5) Å, b = 11.631(9) Å, c = 18.212(5) Å, α = 92.20(7)°, β = 94.79(10)°, γ = 107.6(3)° and Z = 2. The crystal structures were solved by direct methods. The least-squares refinements led to R values of 0.080 and 0.060 for 4061 and 4018 reflections with I ≥ 2σ(I) (according to the SHELXL-93 computer program weighting scheme) for (1) and I ≥ 3σ(I) (Structure Determination Programs, SDP crystallographic package weighting scheme) for (2), respectively. The two independent molecules, A and B, in the asymmetric unit of the tripeptide (1) are folded into a type-I/III and a type-I′/β-bend conformation, respectively, each stabilized by an intramolecular C=O…H–N H-bond. The pentapeptide molecules adopt a 310-helical structure, stabilized by three consecutive, intramolecularly H-bonded type-III (III′) β-bend conformations.
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23
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Revilla-López G, Torras J, Jiménez AI, Cativiela C, Nussinov R, Alemán C. Side-chain to backbone interactions dictate the conformational preferences of a cyclopentane arginine analogue. J Org Chem 2009; 74:2403-12. [PMID: 19236034 PMCID: PMC2682113 DOI: 10.1021/jo802704h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The intrinsic conformational preferences of the nonproteinogenic amino acids constructed by incorporating the arginine side chain in the beta position of 1-aminocyclopentane-1-carboxylic acid (either in a cis or a trans orientation relative to the amino group) have been investigated by using computational methods. These compounds may be considered as constrained analogues of arginine (denoted as c(5)Arg) in which the orientation of the side chain is fixed by the cyclopentane moiety. Specifically, the N-acetyl-N'-methylamide derivatives of cis- and trans-c(5)Arg have been examined in the gas phase and in solution by using B3LYP/6-311+G(d,p) calculations and Molecular Dynamics simulations. Results indicate that the conformational space available to these compounds is highly restricted, their conformational preferences being dictated by the ability of the guanidinium group in the side chain to establish hydrogen bond interactions with the backbone. A comparison with the behavior previously described for the analogous phenylalanine derivatives is presented.
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Affiliation(s)
- Guillem Revilla-López
- Departament d’Enginyeria Química, E. T. S. d’Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
| | - Juan Torras
- Departament d’Enginyeria Química, EUETII, Universitat Politècnica de Catalunya, Pça Rei 15, Igualada 08700, Spain
| | - Ana I. Jiménez
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza – CSIC, 50009 Zaragoza, Spain
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza – CSIC, 50009 Zaragoza, Spain
| | - Ruth Nussinov
- Basic Research Program, SAIC-Frederick, Inc. Center for Cancer Research Nanobiology Program, NCI, Frederick, MD 21702, USA
- Department of Human Genetics Sackler, Medical School, Tel Aviv University, Tel Aviv 69978, Israel
| | - Carlos Alemán
- Departament d’Enginyeria Química, E. T. S. d’Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
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24
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Ballano G, Zanuy D, Jiménez AI, Cativiela C, Nussinov R, Alemán C. Structural analysis of a beta-helical protein motif stabilized by targeted replacements with conformationally constrained amino acids. J Phys Chem B 2008; 112:13101-15. [PMID: 18811190 DOI: 10.1021/jp8032116] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Here we study conformational stabilization induced in a beta-helical nanostructure by position-specific mutations. The nanostructure is constructed through the self-assembly of the beta-helical building block excised from E. coli galactoside acetyltransferase (PDB code 1krr , chain A; residues 131-165). The mutations involve substitutions by cyclic, conformationally constrained amino acids. Specifically, a complete structural analysis of the Pro-Xaa-Val sequence [with Xaa being Gly, Ac 3c (1-aminocyclopropane-1-carboxylic acid) and Ac 5c (1-aminocyclopentane-1-carboxylic acid)], corresponding to the 148-150 loop region in the wild-type (Gly) and mutated (Ac 3c and Ac 5c) 1krr , has been performed using Molecular Dynamics simulations and X-ray crystallography. Simulations have been performed for the wild-type and mutants of three different systems, namely the building block, the nanoconstruct and the isolated Pro-Xaa-Val tripeptide. Furthermore, the crystalline structures of five peptides of Pro-Xaa-Val or Xaa-Val sequences have been solved by X-ray diffraction analysis and compared with theoretical predictions. Both the theoretical and crystallographic studies indicate that the Pro-Ac n c-Val sequences exhibit a high propensity to adopt turn-like conformations, and this propensity is little affected by the chemical environment. Overall, the results indicate that replacement of Gly149 by Ac 3c or Ac 5c significantly reduce the conformational flexibility of the target site enhancing the structural specificity of the building block and the nanoconstruct derived from the 1krr beta-helical motif.
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Affiliation(s)
- Gema Ballano
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Zaragoza, Spain
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25
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Casanovas J, Jiménez AI, Cativiela C, Nussinov R, Alemán C. 1-amino-2-phenylcyclopentane-1-carboxylic acid: a conformationally restricted phenylalanine analogue. J Org Chem 2007; 73:644-51. [PMID: 18081347 DOI: 10.1021/jo702107s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
DFT calculations at the B3LYP/6-311G(d,p) level have been used to investigate the intrinsic conformational preferences of 1-amino-2-phenylcyclopentane-1-carboxylic acid (c5Phe), a constrained analogue of phenylalanine in which the alpha and beta carbons are included in a cyclopentane ring. Specifically, the N-acetyl-N'-methylamide derivatives of the cis and trans stereoisomers, where cis and trans refer to the relative position between the amino group and the phenyl ring, have been calculated. Solvent effects have been examined using a self-consistent reaction field (SCRF) method. Results indicate that the conformational space of the cis stereoisomer is much more restricted than that of the trans derivative both in the gas phase and in solution.
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Affiliation(s)
- Jordi Casanovas
- Departament de Química, Escola Politècnica Superior, Universitat de Lleida, c/Jaume II No. 69, Lleida E-25001, Spain.
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26
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Aleman C, Zanuy D, Casanovas J, Cativiela C, Nussinov R. Backbone conformational preferences and pseudorotational ring puckering of 1-aminocyclopentane-1-carboxylic acid. J Phys Chem B 2007; 110:21264-71. [PMID: 17048955 DOI: 10.1021/jp062804s] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We have used quantum mechanical calculations at the B3LYP/6-311G(d,p) level to determine the conformational preferences of the N-acetyl-N'-methylamide derivative of 1-aminocyclopentane-1-carboxylic acid in the gas phase, chloroform solution, and water solution. The backbone conformation of this dipeptide has been described through the dihedral angles varphi and psi, while the pseudorotational phase angle was used to define the conformation of the cyclopentane ring. Results indicate that the backbone flexibility of this amino acid is restricted by the cyclic nature of the side chain, the relative stability of the different conformations depending on the polarity of the environment. The potential energy of the pseudorotation was also studied as a function of the backbone conformation. Interestingly, the conformation of the cyclic side chain depends on the backbone arrangement. Furthermore, the number of pseudorotational states accessible at room temperature is high in all the investigated environments, especially in aqueous solution. Finally, a set of force-field parameters for classical molecular mechanics calculations was developed for the investigated amino acid. Molecular dynamics simulations in both chloroform and aqueous solutions were performed to demonstrate the reliability of such parameters.
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Affiliation(s)
- Carlos Aleman
- Departament d'Enginyeria Química, E. T. S. d'Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain.
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27
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Bhadbhade MM, Kishore R. An observation of non-superimposable stereogeometrical features in a non-chiral one-component β-Ala model peptide. Biochem Biophys Res Commun 2004; 316:1029-36. [PMID: 15044088 DOI: 10.1016/j.bbrc.2004.02.152] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2004] [Indexed: 10/26/2022]
Abstract
This paper describes the chemical synthesis and crystal molecular conformation of a non-chiral beta-Ala containing model peptide Boc-beta-Ala-Acc5-OCH3. The analysis revealed the existence of two crystallographically independent molecules A and B, in the asymmetric unit. Unexpectedly, while the magnitudes of the backbone torsion angles in both molecules are remarkably similar, the signs of the corresponding torsion angles are reverse therefore, inclining us to suggest the existence of non-superimposable stereogeometrical features in a non-chiral one-component beta-Ala model system. The critical mu torsion angle around CbetaH2-CalphaH2 bond of the beta-Ala residue represents a typical gauche orientation i.e., mu = 67.7 degrees in A and mu = -61.2 degrees in B, providing the molecule an overall crescent shaped topology. The observed conformation contrasts markedly to those determined for the correlated non-chiral model peptides: Boc-beta-Ala-Acc6-OCH3 and Boc-beta-Ala-Aib-OCH3 signifying the role of stereocontrolling elements since the stereochemically constrained Calpha, alpha-disubstituted glycyl residues (e.g., Acc5, Acc6, and the prototype Aib) are known to strongly restrict the peptide backbone conformations in the 3(10)/alpha-helical-regions ( phi approximately +/-60+/-20 degrees, psi approximately +/-30+/-20 degrees) of the Ramachandran map. Unpredictably, the preferred, phi, psi torsion angles of the Acc5 residue fall outside the helical regions of the Ramachandran map and exhibit opposite-handed twists for A and B. The implications of the semi-extended conformation of the Acc5 residue in the construction of backbone-modified novel scaffolds and peptides of biological relevance are highlighted. Taken together, the results indicate that in short linear beta-Ala containing peptides specific structural changes can be induced by selective substitution of non-coded linear- or cyclic symmetrically Calpha,alpha-disubstituted glycines, reinstating the hypothesis that in addition to conformational restrictions, the chemical nature of the neighboring side-chain substituents and local environments collectively influences the stabilization of folding-unfolding behavior of the two methylene units of a beta-Ala residue.
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Affiliation(s)
- M Mohan Bhadbhade
- Center for Materials Characterization, National Chemical Laboratory, Pune - 411 008, India
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28
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Crisma M, Formaggio F, Mezzato S, Toniolo C, Savrda J, Mazaleyrat JP, Wakselman M. Afc can adopt either the fully extended or a turn conformation. Int J Pept Res Ther 2000. [DOI: 10.1007/bf02443571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Lombardi A, De Simone G, Galdiero S, Nastri F, Di Costanzo L, Makihira K, Yamada T, Pavone V. The crystal structure of Afc-containing peptides. Biopolymers 2000; 53:150-60. [PMID: 10679619 DOI: 10.1002/(sici)1097-0282(200002)53:2<150::aid-bip5>3.0.co;2-c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A systematic structural analysis of Afc (9-amino-fluorene-9-carboxylic acid) containing peptides is here reported. The crystal structures of four fully protected tripeptides containing the Afc residue in position 2: Z-X(1)-Afc(2)-Y(3)-OMe (peptide a: X = Y = Gly; peptide b: X = Aib, C(alpha, alpha)-dimethylglycine, Y = Gly; peptide c: X = Gly, Y = Aib; peptide d: X = Y = Aib) have been solved by x-ray crystallography. All the results suggest that the Afc residue has a high propensity to assume an extended conformation. In fact, the Afc residue adopts an extended conformation in three peptides examined in this paper (peptides a-c). In contrast, Afc was found in a folded conformation, in the 3(10)-helical region, only in the peptide d, in which it is both preceded and followed by the strong helix promoting Aib.
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Affiliation(s)
- A Lombardi
- Centro Interuniversitario di Ricerca su Peptidi Bioattivi, CNR, University of Napoli "Federico II" via Mezzocannone 4, I-80134 Napoli, Italy
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Savrda J, Mazaleyrat JP, Wakselman M, Formaggio F, Crisma M, Toniolo C. Synthesis, conformational study, and spectroscopic characterization of the cyclic C alpha, alpha-disubstituted glycine 9-amino-9-fluorenecarboxylic acid. J Pept Sci 1999; 5:61-74. [PMID: 10100122 DOI: 10.1002/(sici)1099-1387(199902)5:2<61::aid-psc173>3.0.co;2-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A series of terminally blocked peptides (to the pentamer level) from L-Ala and the cyclic C alpha, alpha-disubstituted Gly residue Afc and one Gly/Afc dipeptide have been synthesized by solution method and fully characterized. The molecular structure of the amino acid derivative Boc-Afc-OMe and the dipeptide Boc-Afc-Gly-OMe were determined in the crystal state by X-ray diffraction. In addition, the preferred conformation of all of the model peptides was assessed in deuterochloroform solution by FT-IR absorption and 1H-NMR. The experimental data favour the conclusion that the Afc residue tends to adopt either the fully-extended (C5) or a folded/helical structure. In particular, the former conformation is highly populated in solution and is also that found in the crystal state in the two compounds investigated. A comparison with the structural propensities of the strictly related C alpha, alpha-disubstituted Gly residues Ac5c and D phi g is made and the implications for the use of the Afc residue in conformationally constrained analogues of bioactive peptides are briefly examined. A spectroscopic (UV absorption, fluorescence, CD) characterization of this novel aromatic C alpha, alpha-disubstituted Gly residue is also reported.
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Affiliation(s)
- J Savrda
- SIRCOB, Bât, Lavoisier, University of Versailles, France
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31
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Pavone V, Lombardi A, Saviano M, Di Blasio B, Nastri F, Fattorusso R, Zaccaro L, Maglio O, Yamada T, Omote Y. Mixed conformation in C alpha, alpha-disubstituted tripeptides: x-ray crystal structures of Z-Aib-Dph-Gly-OMe and Bz-Dph-Dph-Gly-OMe. Biopolymers 1994; 34:1595-604. [PMID: 7849223 DOI: 10.1002/bip.360341204] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We report here the synthesis and molecular structure in the solid state of fully protected tripeptides containing C alpha, alpha-diphenylglycine (Dph), namely Z-Aib-Dph-Gly-OMe (Aib: C alpha, alpha-dimethylglycine) and Bz-Dph-Dph-Gly-OMe. The molecular conformation around the Dph residue, containing two bulky substituents, is fully extended, while the Aib residue, containing two smaller groups on the C alpha atom, adopts the typical 3(10)/alpha-helical conformation. Gly residues, without substituents on the C alpha atom, show different conformational preferences. Each residue seems to behave, from a conformational point of view, independently from the presence of the other residues, and thus mixed local conformations (folded and extended) are present in the crystals. The nonconventional peptide synthesis, using the Ugi reaction, is also reported.
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Affiliation(s)
- V Pavone
- Centro Interdipartimentale di Ricerca su Peptidi Bioattivi, University of Naples Federico II, Italy
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Di Blasio B, Lombardi A, Nastri F, Saviano M, Pedone C, Yamada T, Nakao M, Kuwata S, Pavone V. Conformation of diastereomeric peptide sequences: structural analysis of Z-D-Val-Ac6c-Gly-L-Phe-OMe. Biopolymers 1992; 32:1155-61. [PMID: 1420984 DOI: 10.1002/bip.360320904] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We have recently undertaken a systematic structural analysis of fully protected tetrapeptides containing at the N- and C-terminus either homo- or heterochiral amino acids, spaced by an achiral dipeptide segment. The interest for this class of peptides derives from the observation that, on reverse-phase (HPLC), the homo- and heterochiral sequences have a markedly different retention times. The diastereomeric sequences, namely Z-(L/D)-Val-X-Y-L-Phe-OMe (X = Sar, Gly, Ac3c, Aib, Ac5c, Ac6c, Deg, Dpg, Dbu, Dip, Dph; Y = Sar, Gly, Ac3c, Aib, Ac5c, Ac6c) show different overall hydrophobicity attributed to a different three-dimensional structure that also depends on the X-Y segment. Therefore, following preliminary studies in solution, we report here the detailed x-ray analysis of the tetrapeptide Z-D-Val-Ac6c-Gly-L-Phe-OMe in order to understand the structural features governing the overall hydrophobicity of linear fully protected tetrapeptides.
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Affiliation(s)
- B Di Blasio
- Department of Chemistry, University Federico II, Napoli, Italy
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Valle G, Crisma M, Toniolo C, Sudhanand, Rao RB, Sukumar M, Balaram P. Stereochemistry of peptides containing 1-aminocycloheptane-1-carboxylic acid (Ac7c). INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1991; 38:511-8. [PMID: 1819586 DOI: 10.1111/j.1399-3011.1991.tb01534.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The crystal structures of four peptides incorporating 1-aminocycloheptane-1-carboxylic acid (Ac7c) are described. Boc-Aib-Ac7c-NHMe and Boc-Pro-Ac7c-Ala-OMe adopt beta-turn conformations stabilized by an intramolecular 4----1 hydrogen bond, the former folding into a type-I/III beta-turn and the latter into a type-II beta-turn. In the dipeptide esters, Boc-Aib-Ac7c-OMe and Boc-Pro-Ac7c-OMe, the Ac7c and Aib residues adopt helical conformations, while the Pro residue remains semi-extended in both the molecules of Boc-Pro-Ac7c-OMe found in the asymmetric unit. The cycloheptane ring of Ac7c residues adopts a twist-chair conformation in all the peptides studied. 1H-NMR studies in CDCl3 and (CD3)2SO and IR studies in CDCl3 suggest that Boc-Aib-Ac7c-NHMe and Boc-Pro-Ac7c-Ala-OMe maintain the beta-turn conformations in solution.
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Affiliation(s)
- G Valle
- Department of Organic Chemistry, University of Padova, Italy
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Santini A, Barone V, Bavoso A, Benedetti E, Di Blasio B, Fraternali F, Lelj F, Pavone V, Pedone C, Crisma M, Bonora G, Toniolo C. Structural versatility of peptides from Cα,α-dialkylated glycines: a conformational energy calculation and X-ray diffraction study of homopeptides from 1-aminocyclopentane-1-carboxylic acid. Int J Biol Macromol 1988. [DOI: 10.1016/0141-8130(88)90007-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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