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Nigam KK, Pandey MD. Zinc-Induced Luminescent l-Valine-Based Pseudopeptidic Soft Bioinspired Materials for Precise Tuning of Nanoassembly. ACS Biomater Sci Eng 2024; 10:1393-1402. [PMID: 38386412 DOI: 10.1021/acsbiomaterials.3c01954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Pseudopeptide-based bioinspired materials are emerging for selective recognition of biologically significant analytes and are applicable in the modern nanoscience field. Therefore, we have developed novel multifunctional C2-symmetric soft pseudopeptides by amino acid l-valine and salicylaldehyde fragments using a series of aliphatic linkers. They are highly selective and sensitive to Zn (II) ions under physiological conditions and reveal significant fluorescence enhancement with the PET mechanism. The molecular self-assembly shows zinc-induced morphological transformation of the rod-shaped assembly into a chain-like morphology. Such a metal-induced hierarchical nano-assembly may have relevance for specific nanobiotechnology applications.
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Affiliation(s)
- Kamlesh Kumar Nigam
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Mrituanjay D Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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Karhu L, Weisell J, Turunen PM, Leino TO, Pätsi H, Xhaard H, Kukkonen JP, Wallén EAA. Stapled truncated orexin peptides as orexin receptor agonists. Peptides 2018; 102:54-60. [PMID: 29475074 DOI: 10.1016/j.peptides.2018.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 01/29/2018] [Accepted: 02/16/2018] [Indexed: 10/18/2022]
Abstract
The peptides orexin-A and -B, the endogenous agonists of the orexin receptors, have similar 19-amino-acid C-termini which retain full maximum response as truncated peptides with only marginally reduced potency, while further N-terminal truncations successively reduce the activity. The peptides have been suggested to bind in an α-helical conformation, and truncation beyond a certain critical length is likely to disrupt the overall helical structure. In this study, we set out to stabilize the α-helical conformation of orexin-A15-33 via peptide stapling at four different sites. At a suggested hinge region, we varied the length of the cross-linker as well as replaced the staple with two α-aminoisobutyric acid residues. Modifications close to the peptide C-terminus, which is crucial for activity, were not allowed. However, central and N-terminal modifications yielded bioactive peptides, albeit with decreased potencies. This provides evidence that the orexin receptors can accommodate and be activated by α-helical peptides. The decrease in potency is likely linked to a stabilization of suboptimal peptide conformation or blocking of peptide backbone-receptor interactions at the hinge region by the helical stabilization or the modified amino acids.
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Affiliation(s)
- Lasse Karhu
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, POB 56, FI-00014 University of Helsinki, Finland.
| | - Janne Weisell
- School of Pharmacy, University of Eastern Finland, POB 1627, FI-70211 Kuopio, Finland.
| | - Pauli M Turunen
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, Faculty of Veterinary Medicine, POB 66, FI-00014, University of Helsinki, Finland; Department of Physiology, Institute of Biomedicine, Biomedicum Helsinki, POB 63, FI-00014 University of Helsinki, Finland.
| | - Teppo O Leino
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, POB 56, FI-00014 University of Helsinki, Finland.
| | - Henri Pätsi
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, POB 56, FI-00014 University of Helsinki, Finland.
| | - Henri Xhaard
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, POB 56, FI-00014 University of Helsinki, Finland.
| | - Jyrki P Kukkonen
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, Faculty of Veterinary Medicine, POB 66, FI-00014, University of Helsinki, Finland; Department of Physiology, Institute of Biomedicine, Biomedicum Helsinki, POB 63, FI-00014 University of Helsinki, Finland.
| | - Erik A A Wallén
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, POB 56, FI-00014 University of Helsinki, Finland.
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