1
|
Lee JW, Collins JE, Wendt KL, Chakrabarti D, Cichewicz RH. Leveraging Peptaibol Biosynthetic Promiscuity for Next-Generation Antiplasmodial Therapeutics. JOURNAL OF NATURAL PRODUCTS 2021; 84:503-517. [PMID: 33565879 PMCID: PMC7941592 DOI: 10.1021/acs.jnatprod.0c01370] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Malaria remains a worldwide threat, afflicting over 200 million people each year. The emergence of drug resistance against existing therapeutics threatens to destabilize global efforts aimed at controlling Plasmodium spp. parasites, which is expected to leave vast portions of humanity unprotected against the disease. To address this need, systematic testing of a fungal natural product extract library assembled through the University of Oklahoma Citizen Science Soil Collection Program has generated an initial set of bioactive extracts that exhibit potent antiplasmodial activity (EC50 < 0.30 μg/mL) and low levels of toxicity against human cells (less than 50% reduction in HepG2 growth at 25 μg/mL). Analysis of the two top-performing extracts from Trichoderma sp. and Hypocrea sp. isolates revealed both contained chemically diverse assemblages of putative peptaibol-like compounds that were responsible for their antiplasmodial actions. Purification and structure determination efforts yielded 30 new peptaibols and lipopeptaibols (1-14 and 28-43), along with 22 known metabolites (15-27 and 44-52). While several compounds displayed promising activity profiles, one of the new metabolites, harzianin NPDG I (14), stood out from the others due to its noteworthy potency (EC50 = 0.10 μM against multi-drug-resistant P. falciparum line Dd2) and absence of gross toxicity toward HepG2 at the highest concentrations tested (HepG2 EC50 > 25 μM, selectivity index > 250). The unique chemodiversity afforded by these fungal isolates serves to unlock new opportunities for translating peptaibols into a bioactive scaffold worthy of further development.
Collapse
Affiliation(s)
| | | | - Karen L. Wendt
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Debopam Chakrabarti
- Corresponding Authors: Robert H. Cichewicz – Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, Oklahoma 73019, United States; ; Debopam Chakrabarti – Division of Molecular Microbiology, Burnett School of Biomedical Sciences, University of Central Florida, Orlando, Florida 32826, United States;
| | - Robert H. Cichewicz
- Corresponding Authors: Robert H. Cichewicz – Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, Oklahoma 73019, United States; ; Debopam Chakrabarti – Division of Molecular Microbiology, Burnett School of Biomedical Sciences, University of Central Florida, Orlando, Florida 32826, United States;
| |
Collapse
|
2
|
Meneghin E, Biscaglia F, Volpato A, Bolzonello L, Pedron D, Frezza E, Ferrarini A, Gobbo M, Collini E. Biomimetic Nanoarchitectures for Light Harvesting: Self-Assembly of Pyropheophorbide-Peptide Conjugates. J Phys Chem Lett 2020; 11:7972-7980. [PMID: 32886518 PMCID: PMC8011917 DOI: 10.1021/acs.jpclett.0c02138] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 09/04/2020] [Indexed: 05/27/2023]
Abstract
The biological light-harvesting process offers an unlimited source of inspiration. The high level of control, adaptation capability, and efficiency challenge humankind to create artificial biomimicking nanoarchitectures with the same performances to respond to our energy needs. Here, in the extensive search for design principles at the base of efficient artificial light harvesters, an approach based on self-assembly of pigment-peptide conjugates is proposed. The solvent-driven and controlled aggregation of the peptide moieties promotes the formation of a dense network of interacting pigments, giving rise to an excitonic network characterized by intense and spectrally wide absorption bands. The ultrafast dynamics of the nanosystems studied through two-dimensional electronic spectroscopy reveals that the excitation energy is funneled in an ultrafast time range (hundreds of femtoseconds) to a manifold of long-living dark states, thus suggesting the considerable potentiality of the systems as efficient harvesters.
Collapse
Affiliation(s)
- Elena Meneghin
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Francesca Biscaglia
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Andrea Volpato
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Luca Bolzonello
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Danilo Pedron
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Elisa Frezza
- Université
de Paris, CiTCoM, CNRS, F-75006 Paris, France
| | - Alberta Ferrarini
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Marina Gobbo
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Elisabetta Collini
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| |
Collapse
|
3
|
Zieleniewski F, Woolfson DN, Clayden J. Automated solid-phase concatenation of Aib residues to form long, water-soluble, helical peptides. Chem Commun (Camb) 2020; 56:12049-12052. [PMID: 32902536 DOI: 10.1039/d0cc04698a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iterative coupling of 2-aminoisobutyric acid (Aib) has been achieved rapidly and efficiently using automated solid-phase peptide synthesis, employing diisopropylcarbodiimide (DIC) in the presence of ethyl cyanohydroxyiminoacetate (Oxyma). This method has allowed the first total synthesis of the fungal antibiotic Cephaibol D, and enabled the synthesis of water-soluble oligomers of Aib containing up to an unprecedented sequence of 17 consecutive Aib residues. Conformational analysis of the Aib oligomers in aqueous solution shows a length dependence in their CD spectra, with oligomers of more than 14 Aib residues apparently adopting structured helical conformations.
Collapse
Affiliation(s)
- Francis Zieleniewski
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | | | | |
Collapse
|
4
|
Locarno S, Argentiere S, Ruffoni A, Maggioni D, Soave R, Bucci R, Erba E, Lenardi C, Gelmi ML, Clerici F. Self-assembled hydrophobic Ala-Aib peptide encapsulating curcumin: a convenient system for water insoluble drugs. RSC Adv 2020; 10:9964-9975. [PMID: 35498617 PMCID: PMC9050355 DOI: 10.1039/c9ra10981a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Accepted: 03/03/2020] [Indexed: 12/03/2022] Open
Abstract
The exploitation of self-assembled systems to improve the solubility of drugs is getting more and more attention. Among the different types of self-assembled biomaterials, peptides and in particular peptides containing non-coded amino acids (NCAPs) are promising because their use opens the door to more stable materials inducing increased stability to proteolysis. New classes of NCAP, Ac-Ala-X-Ala-Aib-AlaCONH2 (X = alpha-aminoisobutyric acid (Aib) or X = cyclopentane amino acid (Ac5c)) have been prepared and the correlation between the different secondary peptide structure and solvent (i.e. CD3CN, CD3OH, H2O/D2O) verified by NMR. Furthermore, the formation of a nanocolloidal system in water was deeply studied by DLS and the morphology of the obtained spherical aggregates with nanometric dimensions was assessed by TEM. Aib containing pentapeptide was selected for greater ease of synthesis. Its ability to encapsulate curcumin, as a model insoluble drug molecule, was investigated using fluorescence emission and confocal microscopy analyses. Two different approaches were used to study the interaction between curcumin and peptide aggregates. In the first approach peptide aggregates were formed in the presence of curcumin, while in the second approach curcumin was added to the already formed peptide aggregates. We succeeded in our challenge by using the second approach and 53.8% of added curcumin had been encapsulated.
Collapse
Affiliation(s)
- Silvia Locarno
- Department of Pharmaceutical Sciences, General and Organic Chemistry Section "A. Marchesini", University of Milan Via Venezian 21 20133 Milano Italy
| | - Simona Argentiere
- CIMAINA, Interdisciplinary Center for Nanostructured Materials and Interfaces, Department of Physics Via Celoria 16 20133 Milano Italy
| | | | - Daniela Maggioni
- Department of Chemistry, Università Degli Studi di Milano Via Golgi 19 20133 Milano Italy
| | - Raffaella Soave
- Institute of Chemical Sciences and Technologies "Giulio Natta", Italian National Research Council, CNR-SCITEC Via Golgi 19 20133 Milano Italy
| | - Raffaella Bucci
- Department of Pharmaceutical Sciences, General and Organic Chemistry Section "A. Marchesini", University of Milan Via Venezian 21 20133 Milano Italy
| | - Emanuela Erba
- Department of Pharmaceutical Sciences, General and Organic Chemistry Section "A. Marchesini", University of Milan Via Venezian 21 20133 Milano Italy
| | - Cristina Lenardi
- CIMAINA, Interdisciplinary Center for Nanostructured Materials and Interfaces, Department of Physics Via Celoria 16 20133 Milano Italy
| | - Maria Luisa Gelmi
- Department of Pharmaceutical Sciences, General and Organic Chemistry Section "A. Marchesini", University of Milan Via Venezian 21 20133 Milano Italy
| | - Francesca Clerici
- Department of Pharmaceutical Sciences, General and Organic Chemistry Section "A. Marchesini", University of Milan Via Venezian 21 20133 Milano Italy
| |
Collapse
|
5
|
Lyu Y, Marafon G, Martínez Á, Moretto A, Scrimin P. Oligopeptide Helical Conformations Control Gold Nanoparticle Cross‐Linking. Chemistry 2019; 25:11758-11764. [DOI: 10.1002/chem.201902552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Yanchao Lyu
- Department of Chemical Sciences University of Padova Via Marzolo, 1 35131 Padova Italy
| | - Giulia Marafon
- Department of Chemical Sciences University of Padova Via Marzolo, 1 35131 Padova Italy
| | - Álvaro Martínez
- Department of Chemical Sciences University of Padova Via Marzolo, 1 35131 Padova Italy
- Current address: International Physics Center Paseo Manuel de Lardizabal 4 Donostia 20018 Spain
| | - Alessandro Moretto
- Department of Chemical Sciences University of Padova Via Marzolo, 1 35131 Padova Italy
| | - Paolo Scrimin
- Department of Chemical Sciences University of Padova Via Marzolo, 1 35131 Padova Italy
| |
Collapse
|
6
|
De Zotti M, Clayden J. Extended Diethylglycine Homopeptides Formed by Desulfurization of Their Tetrahydrothiopyran Analogues. Org Lett 2019; 21:2209-2212. [PMID: 30859838 DOI: 10.1021/acs.orglett.9b00501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Diethylglycine (Deg) homopeptides adopt the rare 2.05-helical conformation, the longest three-dimensional structure that a peptide of a given sequence can adopt. Despite this unique conformational feature, Deg is rarely used in peptide design because of its poor reactivity. In this paper, we show that reductive desulfurization of oligomers formed from more reactive tetrahydrothiopyran-containing precursors provides a practical way to build the longest Deg homopeptides so far made, and we detail some conformational studies of the Deg oligomers and their heterocyclic precursors.
Collapse
Affiliation(s)
- Marta De Zotti
- Department of Chemistry , University of Padova , Via Marzolo 1 , 35131 Padova , Italy
| | - Jonathan Clayden
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| |
Collapse
|
7
|
Biscaglia F, Frezza E, Zurlo E, Gobbo M. Linker dependent chirality of solvent induced self-assembled structures of porphyrin-α-helical peptide conjugates. Org Biomol Chem 2018; 14:9568-9577. [PMID: 27722414 DOI: 10.1039/c6ob01633b] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solvent-promoted aggregation of porphyrins covalently linked to medium length peptides occurs with the formation of chiral supramolecular structures if the peptide chain can adopt an α-helical secondary structure. The circular dichroism spectra of different porphyrin-peptide conjugates show that the chiral arrangement of the porphyrins in the aggregates does not depend on the screw-sense of the peptide helix. Experimental evidence and molecular dynamic simulations suggest that the linker between the porphyrin and the peptide helix is responsible for the overall chirality of supramolecular structures. In particular when the linker is a chiral α-amino acid it is possible to tune the morphology of the chiral aggregates by inverting the configuration of the chiral center.
Collapse
Affiliation(s)
- Francesca Biscaglia
- Department of Chemical Sciences, University of Padova, I-35131 Padova, Italy.
| | - Elisa Frezza
- Department of Chemical Sciences, University of Padova, I-35131 Padova, Italy.
| | - Enrico Zurlo
- Department of Chemical Sciences, University of Padova, I-35131 Padova, Italy.
| | - Marina Gobbo
- Department of Chemical Sciences, University of Padova, I-35131 Padova, Italy. and Institute of Biomolecular Chemistry, Padova Unit, C. N. R., I-35131 Padova, Italy
| |
Collapse
|
8
|
Nasrallah H, Rabah J, Bui-Thi-Tuyet V, Baczko K, Fensterbank H, Bourdreux F, Goncalves AM, Declerck V, Boujday S, Humblot V, Wright K, Vallée A, Allard E. A fullerene helical peptide: synthesis, characterization and formation of self-assembled monolayers on gold surfaces. NEW J CHEM 2018. [DOI: 10.1039/c8nj04599b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A helical C60-peptide allowed the formation of well-packed SAMs compared to a C60-alkyl peptide, which was determined by QCM and CV experiments.
Collapse
|
9
|
Tarasenko I, Zashikhina N, Guryanov I, Volokitina M, Biondi B, Fiorucci S, Formaggio F, Tennikova T, Korzhikova-Vlakh E. Amphiphilic polypeptides with prolonged enzymatic stability for the preparation of self-assembled nanobiomaterials. RSC Adv 2018; 8:34603-34613. [PMID: 35548620 PMCID: PMC9087002 DOI: 10.1039/c8ra06324a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 10/01/2018] [Indexed: 12/25/2022] Open
Abstract
Aib residue distribution in Lys/Aib polymers influences the morphology of forming nanoparticles and the rate of their enzymatic degradation.
Collapse
Affiliation(s)
- Irina Tarasenko
- Institute of Macromolecular Compounds
- Russian Academy of Sciences
- 199004 St Petersburg
- Russia
| | - Natalia Zashikhina
- Institute of Macromolecular Compounds
- Russian Academy of Sciences
- 199004 St Petersburg
- Russia
- Institute of Chemistry
| | - Ivan Guryanov
- Institute of Chemistry
- St Petersburg State University
- 26 Universitetskij Pr
- St Petersburg
- Russia
| | - Maria Volokitina
- Institute of Macromolecular Compounds
- Russian Academy of Sciences
- 199004 St Petersburg
- Russia
| | - Barbara Biondi
- Department of Clinical and Experimental Medicine
- University of Perugia
- 06132 Perugia
- Italy
| | | | - Fernando Formaggio
- Department of Clinical and Experimental Medicine
- University of Perugia
- 06132 Perugia
- Italy
| | - Tatiana Tennikova
- Institute of Chemistry
- St Petersburg State University
- 26 Universitetskij Pr
- St Petersburg
- Russia
| | - Evgenia Korzhikova-Vlakh
- Institute of Macromolecular Compounds
- Russian Academy of Sciences
- 199004 St Petersburg
- Russia
- Institute of Chemistry
| |
Collapse
|
10
|
Marafon G, Menegazzo I, De Zotti M, Crisma M, Toniolo C, Moretto A. Tuning morphological architectures generated through living supramolecular assembly of a helical foldamer end-capped with two complementary nucleobases. SOFT MATTER 2017; 13:4231-4240. [PMID: 28509927 DOI: 10.1039/c7sm00764g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Two appropriately functionalized nucleobases, thymine and adenine, have been covalently linked at the N- and C-termini, respectively, of two α-aminoisobutyric acid-rich helical peptide foldamers, aiming at driving self-assembly through complementary recognition. A crystal-state analysis (by X-ray diffraction) on the shorter, achiral foldamer 1 unambiguously shows that adeninethymine base pairing, through Watson-Crick intermolecular H-bonding, does take place between either end of each peptide molecule. In the crystals, π-stacking between base pairs is also observed. Evidence for time-dependent foldameroldamer associations for the longer, chiral foldamer 2 in solution is provided by circular dichroism measurements. The self-assembly of foldamer 2, through living supramolecular polymerization, eventually leads to the formation of twisted fibers. Such a supramolecular organization can be affected by addition of either pristine adenine or thymine, that acts as a "terminator" by selectively matching a pairing nucleobase at one end of the foldamer. The co-assembly of foldamer 2 with a porphyrin-derivatized thymine, under appropriate experimental conditions, leads to the formation of vesicles which, in turn, can be converted to the fiber morphology by changing the environmental polarity. Conversely, dendrimeric, star polymer-like microstructures are generated when the supramolecular assembly of foldamer 2 is seeded by adenine-capped gold nanoparticles.
Collapse
Affiliation(s)
- Giulia Marafon
- Department of Chemical Sciences, University of Padova, 35131 Padova, Italy.
| | | | | | | | | | | |
Collapse
|
11
|
Guterman T, Kornreich M, Stern A, Adler-Abramovich L, Porath D, Beck R, Shimon LJW, Gazit E. Formation of bacterial pilus-like nanofibres by designed minimalistic self-assembling peptides. Nat Commun 2016; 7:13482. [PMID: 27853136 PMCID: PMC5473601 DOI: 10.1038/ncomms13482] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 10/07/2016] [Indexed: 02/06/2023] Open
Abstract
Mimicking the multifunctional bacterial type IV pili (T4Ps) nanofibres provides an important avenue towards the development of new functional nanostructured biomaterials. Yet, the development of T4Ps-based applications is limited by the inability to form these nanofibres in vitro from their pilin monomers. Here, to overcome this limitation, we followed a reductionist approach and designed a self-assembling pilin-based 20-mer peptide, derived from the presumably bioelectronic pilin of Geobacter sulfurreducens. The designed 20-mer, which spans sequences from both the polymerization domain and the functionality region of the pilin, self-assembled into ordered nanofibres. Investigation of the 20-mer revealed that shorter sequences which correspond to the polymerization domain form a supramolecular β-sheet, contrary to their helical configuration in the native T4P core, due to alternative molecular recognition. In contrast, the sequence derived from the functionality region maintains a native-like, helical conformation. This study presents a new family of self-assembling peptides which form T4P-like nanostructures.
Collapse
Affiliation(s)
- Tom Guterman
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Micha Kornreich
- The Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
| | - Avigail Stern
- Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel
| | - Lihi Adler-Abramovich
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
| | - Danny Porath
- Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel
| | - Roy Beck
- The Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
| | - Linda J W Shimon
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ehud Gazit
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel.,Department of Materials Science and Engineering, Iby and Aladar Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv 6997801, Israel
| |
Collapse
|
12
|
Maffucci I, Contini A. An Updated Test of AMBER Force Fields and Implicit Solvent Models in Predicting the Secondary Structure of Helical, β-Hairpin, and Intrinsically Disordered Peptides. J Chem Theory Comput 2016; 12:714-27. [DOI: 10.1021/acs.jctc.5b01211] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Irene Maffucci
- Dipartimento di Scienze Farmaceutiche
− Sezione di Chimica Generale e Organica “Alessandro
Marchesini”, Università degli Studi di Milano, Via
Venezian, 21 20133 Milano, Italy
| | - Alessandro Contini
- Dipartimento di Scienze Farmaceutiche
− Sezione di Chimica Generale e Organica “Alessandro
Marchesini”, Università degli Studi di Milano, Via
Venezian, 21 20133 Milano, Italy
| |
Collapse
|
13
|
Maffucci I, Clayden J, Contini A. Origin of Helical Screw Sense Selectivity Induced by Chiral Constrained Cα-Tetrasubstituted α-Amino Acids in Aib-based Peptides. J Phys Chem B 2015; 119:14003-13. [PMID: 26457452 DOI: 10.1021/acs.jpcb.5b07050] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The mechanisms behind the propensity of chiral constrained Cα-tetrasubstituted amino acids (cCTAAs) to induce one particular helical screw sense, when included in the Ac-Aib2-cCTAA-Aib2-NHMe peptide model, were studied through replica exchange molecular dynamics, potential of mean force, and quantum theory of atoms in molecules calculations. We observed that cCTAAs exert their effect on helical screw sense selectivity through the positioning of the side chain to generate steric hindrance in either the (-x, +y, +z) or (+x, +y, -z) sectors of a right-handed 3D Cartesian space, where the z axis corresponds to the axis of the helix and the Cα lies on the +y semiaxis (0, +y, 0). The different strengthening of the noncovalent interactions, also comprising C-H···O interactions, exerted by the cCTAA in the right-handed or left-handed helix was also found important to define the preference of a cCTAA for a particular helix screw sense.
Collapse
Affiliation(s)
- Irene Maffucci
- Dipartimento di Scienze Farmaceutiche - Sezione di Chimica Generale e Organica "Alessandro Marchesini", Università degli Studi di Milano , Via Venezian, 21, 20133 Milano, Italy
| | - Jonathan Clayden
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, U.K
| | - Alessandro Contini
- Dipartimento di Scienze Farmaceutiche - Sezione di Chimica Generale e Organica "Alessandro Marchesini", Università degli Studi di Milano , Via Venezian, 21, 20133 Milano, Italy
| |
Collapse
|
14
|
Pellegrino S, Bonetti A, Clerici F, Contini A, Moretto A, Soave R, Gelmi ML. 1H-Azepine-2-oxo-5-amino-5-carboxylic Acid: A 310 Helix Inducer and an Effective Tool for Functionalized Gold Nanoparticles. J Org Chem 2015; 80:5507-16. [DOI: 10.1021/acs.joc.5b00396] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sara Pellegrino
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Andrea Bonetti
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Francesca Clerici
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Alessandro Contini
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Alessandro Moretto
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, Via
Marzolo 1 35131, Padova, Italy
| | - Raffaella Soave
- CNR- Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19 20133, Milano, Italy
| | - Maria Luisa Gelmi
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| |
Collapse
|
15
|
Maffucci I, Pellegrino S, Clayden J, Contini A. Mechanism of stabilization of helix secondary structure by constrained Cα-tetrasubstituted α-amino acids. J Phys Chem B 2015; 119:1350-61. [PMID: 25528885 DOI: 10.1021/jp510775e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The theoretical basis behind the ability of constrained Cα-tetrasubstituted amino acids (CTAAs) to induce stable helical conformations has been studied through Replica Exchange Molecular Dynamics Potential of Mean Force Quantum Theory of Atoms In Molecules calculations on Ac-l-Ala-CTAA-l-Ala-Aib-l-Ala-NHMe peptide models. We found that the origin of helix stabilization by CTAAs can be ascribed to at least two complementary mechanisms limiting the backbone conformational freedom: steric hindrance predominantly in the (+x,+y,-z) sector of a right-handed 3D Cartesian space, where the z axis coincides with the helical axis and the Cα of the CTAA lies on the +y axis (0,+y,0), and the establishment of additional and relatively strong C-H···O interactions involving the CTAA.
Collapse
Affiliation(s)
- Irene Maffucci
- Dipartimento di Scienze Farmaceutiche - Sezione di Chimica Generale e Organica "Alessandro Marchesini", Università degli Studi di Milano , Via Venezian, 21 20133 Milano, Italy
| | | | | | | |
Collapse
|
16
|
Ruffoni A, Contini A, Soave R, Lo Presti L, Esposto I, Maffucci I, Nava D, Pellegrino S, Gelmi ML, Clerici F. Model peptides containing the 3-sulfanyl-norbornene amino acid, a conformationally constrained cysteine analogue effective inducer of 310-helix secondary structures. RSC Adv 2015. [DOI: 10.1039/c5ra03805g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Two model peptides containing the 3-benzylsulfanylnorbornene amino acid (NRB) was prepared. Theoretical calculations, spectroscopic and X-ray analyses confirmed that both NRB enantiomers possess a strong right-handed helicogenic effect.
Collapse
|
17
|
Longo E, Orlandin A, Mancin F, Scrimin P, Moretto A. Reversible chirality control in peptide-functionalized gold nanoparticles. ACS NANO 2013; 7:9933-9939. [PMID: 24127829 DOI: 10.1021/nn403816a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report the induction of chiroptical properties in 2 nm diameter gold nanoparticles passivated with short peptides characterized by the Aib-l-Ala repetition in their sequence. The nanoparticles present relevant ECD signals in the 300-650 nm wavelength region, corresponding to the gold nanoparticle's quantized electronic structure. Although the only chiral amino acid present in the peptide sequences is l-Ala, the particles show mirror image spectra like those of enantiomers according to the number of amino acids in the main chain (odd or even). Such a behavior appears to be strongly influenced by the secondary structure assumed by the peptides when passivating the nanoparticles and vanishes when the sequence is long enough to assume a 310-helix conformation. Moreover, chirality control is a reversible process and can be deactivated or reactivated by increasing or decreasing the temperature.
Collapse
Affiliation(s)
- Edoardo Longo
- Department of Chemical Sciences, University of Padova , Via Marzolo 1, 35131 Padova, Italy
| | | | | | | | | |
Collapse
|
18
|
Hydrophobic Aib/Ala peptides solubilize in water through formation of supramolecular assemblies. Polym J 2013. [DOI: 10.1038/pj.2013.24] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
19
|
Pellegrino S, Contini A, Clerici F, Gori A, Nava D, Gelmi ML. 1H-Azepine-4-amino-4-carboxylic acid: a new α,α-disubstituted ornithine analogue capable of inducing helix conformations in short Ala-Aib pentapeptides. Chemistry 2012; 18:8705-15. [PMID: 22689465 DOI: 10.1002/chem.201104023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/30/2012] [Indexed: 11/08/2022]
Abstract
A very efficient synthesis of orthogonally protected 1H-azepine-4-amino-4-carboxylic acid, abbreviated as Azn, a conformationally restricted analogue of ornithine, was realized. It was obtained on a gram scale in good overall yield in five steps, three of which did not require isolation of the intermediates, starting from the readily available 1-amino-4-oxo-cyclohexane-4-carboxylic acid. Both enantiomers were used for the preparation of pentapeptide models containing Ala, Aib, and Azn. Conformational studies using both spectroscopic techniques (NMR, CD) and molecular dynamics on model 5-mer peptides showed that the (R)-Azn isomer possesses a marked helicogenic effect.
Collapse
Affiliation(s)
- Sara Pellegrino
- DISMAB, Sezione di Chimica Organica A. Marchesini, Facoltà di Farmacia, Università degli Studi Milano, Via Venezian 21, 20133 Milano, Italy.
| | | | | | | | | | | |
Collapse
|