1
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Chen Z, Chi Z, Sun Y, Lv Z. Chirality in peptide-based materials: From chirality effects to potential applications. Chirality 2021; 33:618-642. [PMID: 34342057 DOI: 10.1002/chir.23344] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/24/2021] [Accepted: 07/13/2021] [Indexed: 12/23/2022]
Abstract
Chirality is ubiquitous in nature with primary cellular functions that include construction of right-/left-handed helix and selective communications among diverse biomolecules. Of particularly intriguing are the chiral peptide-based materials that can be deliberately designed to change physicochemistry properties via tuning peptide sequences. Critically, understanding their chiral effects are fundamental for the development of novel materials in chemistry and biomedicine fields. Here, we review recent researches on chirality in peptide-based materials, summarizing relevant typical chiral effects towards recognition, amplification, and induction. Driven forces for the chiral discrimination in affinity interaction as well as the handedness preferences in supramolecular structure formation at both the macroscale and microscale are illustrated. The implementation of such chirality effects of artificial copolymers, assembled aggregates and their composites in the fields of bioseparation and bioenrichment, cell incubation, protein aggregation inhibitors, chiral smart gels, and bionic electro devices are also presented. At last, the challenges in these areas and possible directions are pointed out. The diversity of chiral roles in the origin of life and chirality design in different organic or composite systems as well as their applications in drug development and chirality detection in environmental protection are discussed.
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Affiliation(s)
- Zhonghui Chen
- Guangdong Engineering Technology Research Center for High performance Organic and Polymer Photoelectric Functional Films, State Key Laboratory of OEMT, School of Chemistry, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Institute of Analysis, Guangdong Academy of Sciences (China National Analytical Center, Guangzhou), Guangzhou, China
| | - Zhenguo Chi
- Guangdong Engineering Technology Research Center for High performance Organic and Polymer Photoelectric Functional Films, State Key Laboratory of OEMT, School of Chemistry, Sun Yat-sen University, Guangzhou, China
| | - Yifeng Sun
- Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Institute of Analysis, Guangdong Academy of Sciences (China National Analytical Center, Guangzhou), Guangzhou, China
| | - Ziyu Lv
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
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2
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Disassembly and reassembly of diphenylalanine crystals through evaporation of solvent. J Colloid Interface Sci 2021; 599:661-666. [PMID: 33979748 DOI: 10.1016/j.jcis.2021.04.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 11/21/2022]
Abstract
HYPOTHESIS Crystalline self-assemblies of diphenylalanine (FF) are since long back considered to be related to Alzheimer's disease. An improved understanding of the mechanism behind the formation of such structures can lead to strategies for investigating the dynamic processes of assembly and disassembly of FF. EXPERIMENT The assembly, disassembly and reassembly of FF crystals are influenced by the solvent composition and can be triggered by evaporation of solvent. In this work these processes are directly monitored, and the structures obtained are analyzed. FINDINGS The role of the solvent for assembly, disassembly and reassembly of diphenylalanine crystals has been demonstrated. The initial crystal structure formed via self-assembly of FF monomers can be transformed into needle-like crystals and further to hollow hexagonal microtubes through evaporation of the solvent. It is shown that all the assembly-disassembly processes are spontaneous and driven by thermodynamics. It is also found that some of the crystalline structures exhibit optical waveguiding properties.
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3
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Mandal P, Molla AR. Solvent Perturbation of Protein Structures - A Review Study with Lectins. Protein Pept Lett 2020; 27:538-550. [PMID: 31682206 DOI: 10.2174/0929866526666191104145511] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/05/2019] [Accepted: 08/07/2019] [Indexed: 01/07/2023]
Abstract
Use of organic molecules as co-solvent with water, the ubiquitous biological solvent, to perturb the structure of proteins is popular in the research area of protein structure and folding. These organic co-solvents are believed to somehow mimic the environment near the cell membrane. Apart from that they induce non-native states which can be present in the protein folding pathway or those states also may be representative of the off pathway structures leading to amyloid formation, responsible for various fatal diseases. In this review, we shall focus on organic co-solvent induced structure perturbation of various members of lectin family. Lectins are excellent model systems for protein folding study because of its wide occurrence, diverse structure and versatile biological functions. Lectins were mainly perturbed by two fluoroalcohols - 2,2,2- trifluoroethanol and 1,1,1,3,3,3-hexafluoroisopropanol whereas glycerol, ethylene glycol and polyethylene glycols were used in some cases. Overall, all native lectins were denatured by alcohols and most of the denatured lectins have predominant helical secondary structure. But characterization of the helical states and the transition pathway for various lectins revealed diverse result.
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Affiliation(s)
- Pritha Mandal
- Department of Chemistry, Krishnagar Government College, Krishnagar, West Bengal-741101, India
| | - Anisur R Molla
- Department of Chemistry, Bidhannagar College, Salt Lake, Kolkata -700 064, India
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4
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Wiebach V, Mainz A, Schnegotzki R, Siegert MAJ, Hügelland M, Pliszka N, Süssmuth RD. An Amphipathic Alpha-Helix Guides Maturation of the Ribosomally-Synthesized Lipolanthines. Angew Chem Int Ed Engl 2020; 59:16777-16785. [PMID: 32533616 PMCID: PMC7540663 DOI: 10.1002/anie.202003804] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 05/15/2020] [Indexed: 12/19/2022]
Abstract
The recently discovered strongly anti‐Gram‐positive lipolanthines represent a new group of lipidated, ribosomally synthesized and post‐translationally modified peptides (RiPPs). They are bicyclic octapeptides with a central quaternary carbon atom (avionin), which is installed through the cooperative action of the class‐III lanthipeptide synthetase MicKC and the cysteine decarboxylase MicD. Genome mining efforts indicate a widespread distribution and unprecedented biosynthetic diversity of lipolanthine gene clusters, combining elements of RiPPs, polyketide and non‐ribosomal peptide biosynthesis. Utilizing NMR spectroscopy, we show that a (θxx)θxxθxxθ (θ=L, I, V, M or T) motif, which is conserved in the leader peptides of all class‐III and ‐IV lanthipeptides, forms an amphipathic α‐helix in MicA that destines the peptide substrate for enzymatic processing. Our results provide general rules of substrate recruitment and enzymatic regulation during lipolanthine maturation. These insights will facilitate future efforts to rationally design new lanthipeptide scaffolds with antibacterial potency.
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Affiliation(s)
- Vincent Wiebach
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
| | - Andi Mainz
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
| | - Romina Schnegotzki
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
| | - Mary-Ann J Siegert
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
| | - Manuela Hügelland
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
| | - Nicole Pliszka
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
| | - Roderich D Süssmuth
- Institut für Chemie/ Biologische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany
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5
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Wiebach V, Mainz A, Schnegotzki R, Siegert MJ, Hügelland M, Pliszka N, Süssmuth RD. Eine amphipathische alpha‐Helix lenkt die Modifizierung ribosomal‐synthetisierter Lipolanthine. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Vincent Wiebach
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
| | - Andi Mainz
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
| | - Romina Schnegotzki
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
| | - Mary‐Ann J. Siegert
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
| | - Manuela Hügelland
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
| | - Nicole Pliszka
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
| | - Roderich D. Süssmuth
- Institut für Chemie/ Biologische ChemieTechnische Universität Berlin Straße des 17. Juni 124 10623 Berlin Deutschland
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6
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Vincenzi M, Mercurio FA, Leone M. About TFE: Old and New Findings. Curr Protein Pept Sci 2019; 20:425-451. [PMID: 30767740 DOI: 10.2174/1389203720666190214152439] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 07/16/2018] [Accepted: 07/18/2018] [Indexed: 01/28/2023]
Abstract
The fluorinated alcohol 2,2,2-Trifluoroethanol (TFE) has been implemented for many decades now in conformational studies of proteins and peptides. In peptides, which are often disordered in aqueous solutions, TFE acts as secondary structure stabilizer and primarily induces an α -helical conformation. The exact mechanism through which TFE plays its stabilizing roles is still debated and direct and indirect routes, relying either on straight interaction between TFE and molecules or indirect pathways based on perturbation of solvation sphere, have been proposed. Another still unanswered question is the capacity of TFE to favor in peptides a bioactive or a native-like conformation rather than simply stimulate the raise of secondary structure elements that reflect only the inherent propensity of a specific amino-acid sequence. In protein studies, TFE destroys unique protein tertiary structure and often leads to the formation of non-native secondary structure elements, but, interestingly, gives some hints about early folding intermediates. In this review, we will summarize proposed mechanisms of TFE actions. We will also describe several examples, in which TFE has been successfully used to reveal structural properties of different molecular systems, including antimicrobial and aggregation-prone peptides, as well as globular folded and intrinsically disordered proteins.
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Affiliation(s)
- Marian Vincenzi
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy
| | - Flavia A Mercurio
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone 16, 80134 Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone 16, 80134 Naples, Italy
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7
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Dolui S, Roy A, Pal U, Saha A, Maiti NC. Structural Insight of Amyloidogenic Intermediates of Human Insulin. ACS OMEGA 2018; 3:2452-2462. [PMID: 30023834 PMCID: PMC6045404 DOI: 10.1021/acsomega.7b01776] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Accepted: 02/16/2018] [Indexed: 05/27/2023]
Abstract
Engaging Raman spectroscopy as a primary tool, we investigated the early events of insulin fibrilization and determined the structural content present in oligomer and protofibrils that are formed as intermediates in the fibril formation pathway. Insulin oligomer, as obtained upon incubation of zinc-free insulin at 60 °C, was mostly spherical in shape, with a diameter of 3-5 nm. Longer incubation produced "necklace"-like beaded protofibrillar assembly species. These intermediates eventually transformed into 5-8 nm thick fibers with smooth surface texture. A broad amide I band in the Raman spectrum of insulin monomer appeared at 1659 cm-1, with a shoulder band at 1676 cm-1. This signature suggested the presence of major helical and extended secondary structure of the protein backbone. In the oligomeric state, the protein maintained its helical imprint (∼50%) and no substantial increment of the compact cross-β-sheet structure was observed. A nonamide helix signature band at 940 cm-1 was present in the oligomeric state, and it was weakened in the fibrillar structure. The 1-anilino-8-naphthalene-sulfonate binding study strongly suggested that a collapse in the tertiary structure, not the major secondary structural realignment, was the dominant factor in the formation of oligomers. In the fibrillar state, the contents of helical and disordered secondary structures decreased significantly and the β-sheet amount increased to ∼62%. The narrow amide I Raman band at 1674 cm-1 in the fibrillar state connoted the formation of vibrationally restricted highly organized β-sheet structure with quaternary realignment into steric-zipped species.
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Affiliation(s)
- Sandip Dolui
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Anupam Roy
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Uttam Pal
- Chemical
Sciences Division, Saha Institute of Nuclear
Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Achintya Saha
- Department
of Chemical Technology, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta 700009, India
| | - Nakul C. Maiti
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India
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8
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Adamidou T, Arvaniti KO, Glykos NM. Folding Simulations of a Nuclear Receptor Box-Containing Peptide Demonstrate the Structural Persistence of the LxxLL Motif Even in the Absence of Its Cognate Receptor. J Phys Chem B 2017; 122:106-116. [DOI: 10.1021/acs.jpcb.7b10292] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Triantafyllia Adamidou
- Department of Molecular Biology
and Genetics, Democritus University of Thrace, University campus, 68100 Alexandroupolis, Greece
| | - Konstantina-Olympia Arvaniti
- Department of Molecular Biology
and Genetics, Democritus University of Thrace, University campus, 68100 Alexandroupolis, Greece
| | - Nicholas M. Glykos
- Department of Molecular Biology
and Genetics, Democritus University of Thrace, University campus, 68100 Alexandroupolis, Greece
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9
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Roy A, Chandra K, Dolui S, Maiti NC. Envisaging the Structural Elevation in the Early Event of Oligomerization of Disordered Amyloid β Peptide. ACS OMEGA 2017; 2:4316-4327. [PMID: 31457723 PMCID: PMC6641910 DOI: 10.1021/acsomega.7b00522] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 07/25/2017] [Indexed: 05/27/2023]
Abstract
In Alzheimer's disease (AD), amyloid β (Aβ) protein plays a detrimental role in neuronal injury and death. Recent in vitro and in vivo studies suggest that soluble oligomers of the Aβ peptide are neurotoxic. Structural properties of the oligomeric assembly, however, are largely unknown. Our present investigation established that the 40-residue-long Aβ peptide (Aβ40) became more helical, ordered, and compact in the oligomeric state, and both the helical and β-sheet components were found to increase significantly in the early event of oligomerization. The band-selective two-dimensional NMR analysis suggested that majority of the residues from sequence 12 to 22 gained a higher-ordered secondary structure in the oligomeric condition. The presence of a significant amount of helical conformation was confirmed by Raman bands at 1650 and 1336 cm-1. Other residues remained mostly in the extended polyproline II (PPII) and less compact β-conformation space. In the event of maturation of the oligomers into an amyloid fiber, both the helical content and the PPII-like structural components declined and ∼72% residues attained a compact β-sheet structure. Interestingly, however, some residues remained in the collagen triple helix/extended 2.51-helix conformation as evidenced by the amide III Raman signature band at 1272 cm-1. Molecular dynamics analysis using an optimized potential for liquid simulation force field with the peptide monomer indicated that some of the residues may have preferences for helical conformation and this possibly contributed in the event of oligomer formation, which eventually became a β-sheet-rich amyloid fiber.
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Affiliation(s)
- Anupam Roy
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata, West Bengal 700032, India
| | - Kousik Chandra
- NMR
Research Centre, Indian Institute of Science, CV Raman Road, Devasandra Layout, Bengaluru, Karnataka 560012, India
| | - Sandip Dolui
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata, West Bengal 700032, India
| | - Nakul C. Maiti
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata, West Bengal 700032, India
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10
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Punihaole D, Hong Z, Jakubek RS, Dahlburg EM, Geib S, Asher SA. Glutamine and Asparagine Side Chain Hyperconjugation-Induced Structurally Sensitive Vibrations. J Phys Chem B 2015; 119:13039-51. [PMID: 26392216 PMCID: PMC5065012 DOI: 10.1021/acs.jpcb.5b07651] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We identified vibrational spectral marker bands that sensitively report on the side chain structures of glutamine (Gln) and asparagine (Asn). Density functional theory (DFT) calculations indicate that the Amide III(P) (AmIII(P)) vibrations of Gln and Asn depend cosinusoidally on their side chain OCCC dihedral angles (the χ3 and χ2 angles of Gln and Asn, respectively). We use UV resonance Raman (UVRR) and visible Raman spectroscopy to experimentally correlate the AmIII(P) Raman band frequency to the primary amide OCCC dihedral angle. The AmIII(P) structural sensitivity derives from the Gln (Asn) Cβ-Cγ (Cα-Cβ) stretching component of the vibration. The Cβ-Cγ (Cα-Cβ) bond length inversely correlates with the AmIII(P) band frequency. As the Cβ-Cγ (Cα-Cβ) bond length decreases, its stretching force constant increases, which results in an upshift in the AmIII(P) frequency. The Cβ-Cγ (Cα-Cβ) bond length dependence on the χ3 (χ2) dihedral angle results from hyperconjugation between the Cδ═Oϵ (Cγ═Oδ) π* and Cβ-Cγ (Cα-Cβ) σ orbitals. Using a Protein Data Bank library, we show that the χ3 and χ2 dihedral angles of Gln and Asn depend on the peptide backbone Ramachandran angles. We demonstrate that the inhomogeneously broadened AmIII(P) band line shapes can be used to calculate the χ3 and χ2 angle distributions of peptides. The spectral correlations determined in this study enable important new insights into protein structure in solution, and in Gln- and Asn-rich amyloid-like fibrils and prions.
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Ryan S. Jakubek
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Elizabeth M. Dahlburg
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Steven Geib
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Sanford A. Asher
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
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11
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Shinde UP, Moon HJ, Ko DY, Jung BK, Jeong B. Control of rhGH Release Profile from PEG–PAF Thermogel. Biomacromolecules 2015; 16:1461-9. [DOI: 10.1021/acs.biomac.5b00325] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Usha Pramod Shinde
- Department of Chemistry and
Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Korea
| | - Hyo Jung Moon
- Department of Chemistry and
Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Korea
| | - Du Young Ko
- Department of Chemistry and
Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Korea
| | - Bo Kyong Jung
- Department of Chemistry and
Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Korea
| | - Byeongmoon Jeong
- Department of Chemistry and
Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Korea
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12
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Kaur H, Sasidhar YU. Environmental polarity induces conformational transitions in a helical peptide sequence from bacteriophage T4 lysozyme and its tandem duplicate: a molecular dynamics simulation study. J Mol Model 2015; 21:88. [PMID: 25773700 DOI: 10.1007/s00894-015-2621-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 02/15/2015] [Indexed: 11/29/2022]
Abstract
Our recent molecular dynamics (MD) simulation of an insertion/duplication mutant 'L20' of bacteriophage T4 lysozyme demonstrated a solvent induced α→β transition in a loosely held duplicate helical region, while α-helical conformation in the parent region was relatively stabilized by its tertiary interactions with the neighboring residues. The solution NMR of the parent helical sequence, sans its protein context, showed no inherent tendency to adopt a particular secondary structure in pure water but showed α-helical propensity in TFE/water and SDS micelles. In this study we investigate the conformational preference of the 'parent' and 'duplicate' sequences, sans the protein context, in pure water and an apolar TFE/water solution. Apolar TFE/water solution is a model for non-polar protein context. We performed MD simulations of the two peptides, in explicit water and 80% (v/v) TFE/water, using GROMOS 53a6 force field, at 300 K and 1 bar (under NPT conditions). We show that in TFE/water mixture, salt bridges are stabilized by apolar TFE molecules and main chain-main chain hydrogen bonds promote the α-helical conformation, particularly in the duplicate peptide. Solvent exposure, in pure water, resulted in an α→β transition to form a triple stranded β-sheet structure in the 'duplicate' sequence, with a rare psi-loop topology, while a mixture of turn/bend conformations were adopted by the 'parent' sequence. Thus the differences in conformational preference of the parent and duplicate sequence sans protein context, in pure water and TFE/water, implicate the importance of the environment polarity in dictating the peptide conformation. Mechanism of folding of the observed psi-loop in the duplicate sequence gives insights into folding of this rare β-sheet topology.
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Affiliation(s)
- Harpreet Kaur
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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13
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Salamone M, Mangiacapra L, Bietti M. Kinetic Solvent Effects on the Reactions of the Cumyloxyl Radical with Tertiary Amides. Control over the Hydrogen Atom Transfer Reactivity and Selectivity through Solvent Polarity and Hydrogen Bonding. J Org Chem 2015; 80:1149-54. [DOI: 10.1021/jo5026767] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Michela Salamone
- Dipartimento
di Scienze e
Tecnologie Chimiche, Università “Tor Vergata”, Via
della Ricerca Scientifica 1, I-00133 Rome, Italy
| | - Livia Mangiacapra
- Dipartimento
di Scienze e
Tecnologie Chimiche, Università “Tor Vergata”, Via
della Ricerca Scientifica 1, I-00133 Rome, Italy
| | - Massimo Bietti
- Dipartimento
di Scienze e
Tecnologie Chimiche, Università “Tor Vergata”, Via
della Ricerca Scientifica 1, I-00133 Rome, Italy
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14
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Bhattacharya S, Ghosh S, Pandey NK, Chaudhury S, Dasgupta S, Roy A. Distribution of protein Ramachandran psi (ψ) angle using non-resonance visible raman scattering measurements. J Phys Chem B 2013; 117:13993-4000. [PMID: 24134469 DOI: 10.1021/jp408009y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Knowing the distribution of Ramachandran angles helps in understanding peptide and protein backbone conformation. Empirical relations are proposed to correlate the spectral profile of the amide III3 band, obtained from ultraviolet resonance Raman measurements (UVRR), with the Ramachandran dihedral psi angle distribution in small peptide and protein molecules, in different environmental conditions (Mikhonin et al. J. Phys. Chem. B 2006, 110, 1928-1943). It has also been used for more complicated structures, like large globular proteins and protein fibrils. In our work here, we use visible Raman spectra and available empirical relations to obtain similar correlations for human serum albumin, hen egg white lysozyme, and human gamma crystallin. We also report the dihedral angle distribution in fibrils and a denatured protein in an ethanol environment using the same spectroscopic technique.
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15
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Mirtič A, Grdadolnik J. The structure of poly-l-lysine in different solvents. Biophys Chem 2013; 175-176:47-53. [DOI: 10.1016/j.bpc.2013.02.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 02/13/2013] [Accepted: 02/13/2013] [Indexed: 10/27/2022]
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16
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De Santis E, Hjelmgaard T, Caumes C, Faure S, Alexander BD, Holder SJ, Siligardi G, Taillefumier C, Edwards AA. Effect of capping groups at the N- and C-termini on the conformational preference of α,β-peptoids. Org Biomol Chem 2012; 10:1108-22. [DOI: 10.1039/c1ob06386c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Shinde UP, Joo MK, Moon HJ, Jeong B. Sol–gel transition of PEG–PAF aqueous solution and its application for hGH sustained release. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15419f] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Xiong K, Zwier MC, Myshakina NS, Burger VM, Asher SA, Chong LT. Direct observations of conformational distributions of intrinsically disordered p53 peptides using UV Raman and explicit solvent simulations. J Phys Chem A 2011; 115:9520-7. [PMID: 21528875 DOI: 10.1021/jp112235d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report the first experimental measurements of Ramachandran Ψ-angle distributions for intrinsically disordered peptides: the N-terminal peptide fragment of tumor suppressor p53 and its P27S mutant form. To provide atomically detailed views of the conformational distributions, we performed classical, explicit-solvent molecular dynamics simulations on the microsecond time scale. Upon binding its partner protein, MDM2, wild-type p53 peptide adopts an α-helical conformation. Mutation of Pro27 to serine results in the highest affinity yet observed for MDM2-binding of the p53 peptide. Both UV resonance Raman spectroscopy (UVRR) and simulations reveal that the P27S mutation decreases the extent of PPII helical content and increases the probability for conformations that are similar to the α-helical MDM2-bound conformation. In addition, UVRR measurements were performed on peptides that were isotopically labeled at the Leu26 residue preceding the Pro27 in order to determine the conformational distributions of Leu26 in the wild-type and mutant peptides. The UVRR and simulation results are in quantitative agreement in terms of the change in the population of non-PPII conformations involving Leu26 upon mutation of Pro27 to serine. Finally, our simulations reveal that the MDM2-bound conformation of the peptide is significantly populated in both the wild-type and mutant isolated peptide ensembles in their unbound states, suggesting that MDM2 binding of the p53 peptides may involve conformational selection.
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Affiliation(s)
- Kan Xiong
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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