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Raganato L, Del Giudice A, Ceccucci A, Sciubba F, Casciardi S, Sennato S, Scipioni A, Masci G. Self-assembling nanowires from a linear l,d-peptide conjugated to the dextran end group. Int J Biol Macromol 2022; 207:656-665. [PMID: 35292281 DOI: 10.1016/j.ijbiomac.2022.03.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/05/2022] [Accepted: 03/09/2022] [Indexed: 11/28/2022]
Abstract
Preparation and characterization of a block-like l,d-octapeptide-dextran conjugate DEX29-(l-Val-d-Val)4 self-assembling into nanowire structures is reported. The conjugate was prepared by solid phase click-chemistry on an alkyne group N-terminus functionalized peptide with a regularly alternating enantiomeric sequence. Low molecular weight dextran (Xn = 29) with moderately low dispersity (1.30) was prepared by controlled acid hydrolysis and dialysis with selected cut-off and functionalized with an azido group on the reducing end by reductive amination. The strong hydrogen bonds and hydrophobic interactions of the (l-Val-d-Val)4 linear peptide drive the conjugate to self-assemble into long (0.1-1 μm) nanowires. To our knowledge, this is the first example of a peptide-polysaccharide conjugate that can self-assemble into a nanowire architecture.
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Affiliation(s)
- Luca Raganato
- Department of Chemistry, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Alessandra Del Giudice
- Department of Chemistry, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Anita Ceccucci
- Department of Industrial, Electronic and Mechanical Engineering, Roma Tre University, via Vito Volterra 62, Roma, Italy
| | - Fabio Sciubba
- Department of Environmental biology, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; NMR-based Metabolomics Laboratory (NMLab), Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Stefano Casciardi
- National Institute for Insurance Against Accidents at Work (INAIL Research), Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, Rome, Italy
| | - Simona Sennato
- Institute for Complex Systems, National Research Council (ISC-CNR), Sede Sapienza and Department of Physics, Sapienza Università di Roma, P.le A. Moro, 2, 00185, Rome, Italy
| | - Anita Scipioni
- Department of Chemistry, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy.
| | - Giancarlo Masci
- Department of Chemistry, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy.
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De Santis S, Novelli F, Sciubba F, Casciardi S, Sennato S, Morosetti S, Scipioni A, Masci G. Switchable length nanotubes from a self-assembling pH and thermosensitive linear l,d-peptide-polymer conjugate. J Colloid Interface Sci 2019; 547:256-266. [PMID: 30954769 DOI: 10.1016/j.jcis.2019.03.093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 03/26/2019] [Accepted: 03/28/2019] [Indexed: 01/30/2023]
Abstract
Preparation and characterization of a pH and thermosensitive linear l,d-octapeptide-poly(dimethylamino ethyl methacrylate) ((l-Val-d-Val)4-PDMAEMA) conjugate is reported. The hydrophobic uncharged linear (l-Val-d-Val)4 octapeptide was designed to self-assemble in nanotubes by exploiting the tubular self-assembling properties of linear peptides with regularly alternating enantiomeric sequences. pH and thermosensitive PDMAEMA was obtained by atom transfer radical polymerization (ATRP). The conjugate was prepared by click-chemistry on the solid phase synthetized peptide. Because of the strong interactions between the peptide moieties, long single channel nanotubes (0.2-1.5 μm) are formed also at acidic pH with the fully charged polymer. At 25 °C and basic pH the size of the nanotubes did not change significantly. In basic conditions and temperature above the PDMAEMA lower critical solution temperature (LCST) a significant increase of the length of the nanotubes up to several micrometers is observed. The size is retained for several days after cooling back to room temperature. Sonication significantly reduces the nanotube length (0.2-0.5 μm) forming low polydisperse nanotubes. The elongation of the nanotubes is fully reversible by restoring acidic pH. This is the first example, to our knowledge, of thermosensitive peptide-polymer single channel nanotubes with length that can be varied from hundreds of nanometers to several micrometers.
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Affiliation(s)
- Serena De Santis
- Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Federica Novelli
- Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Fabio Sciubba
- Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Stefano Casciardi
- National Institute for Insurance against Accidents at Work (INAIL Research), Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, Rome, Italy
| | - Simona Sennato
- Institute for Complex Systems, National Research Council (ISC-CNR), Dipartimento di Fisica, Sapienza Università di Roma, P.le A. Moro, 2 00185 Rome, Italy
| | - Stefano Morosetti
- Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Anita Scipioni
- Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Giancarlo Masci
- Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy.
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