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A novel strategy for production of liraglutide precursor peptide and development of a new long-acting incretin mimic. PLoS One 2022; 17:e0266833. [PMID: 35500009 PMCID: PMC9060347 DOI: 10.1371/journal.pone.0266833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 03/29/2022] [Indexed: 11/27/2022] Open
Abstract
Nowadays, a small number of incretin mimics are used to treat type 2 diabetes mellitus (T2DM) due to their longer half-life. The present study aimed to introduce a novel method for producing the liraglutide precursor peptide (LPP) and developing a potentially new incretin mimic. Here, human αB-crystallin (αB-Cry) was ligated to the LPP at the gene level, and the gene construct was expressed in Escherichia coli with a relatively good efficiency. The hybrid protein (αB-lir) was then purified by a precipitation method followed by anion exchange chromatography. After that, the peptide was released from the carrier protein by a chemical cleavage method yielding about 70%. The LPP was then purified by gel filtration chromatography, and HPLC estimated its purity to be about 98%. Also, the molecular mass of the purified peptide was finally confirmed by mass spectroscopy analysis. Assessment of the secondary structures suggested a dominant α-helical structure for the LPP and a β-sheet rich structure for the hybrid protein. The subcutaneous injection of the LPP and the αB-lir hybrid protein significantly reduced the blood sugar levels in healthy and diabetic mice and stimulated insulin secretion. Also, the hybrid protein exerts its bioactivities more effectively than the LPP over a relatively longer period of time. The results of this study suggested a novel method for the easy and cost-effective production of the LPP and introduced a new long-acting incretin mimic that can be potentially used for the treatment of T2DM patients.
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Pezzotti G, Zhu W, Adachi T, Horiguchi S, Marin E, Boschetto F, Ogitani E, Mazda O. Metabolic machinery encrypted in the Raman spectrum of influenza A virus-inoculated mammalian cells. J Cell Physiol 2019; 235:5146-5170. [PMID: 31710091 DOI: 10.1002/jcp.29392] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 10/15/2019] [Indexed: 12/22/2022]
Abstract
Raman spectroscopy was applied with a high spectral resolution to a structural study of Influenza (type A) virus before and after its inoculation into Madin-Darby canine kidney cells. This study exploits the fact that the major virus and cell constituents, namely DNA/RNA, lipid, and protein molecules, exhibit peculiar fingerprints in the Raman spectrum, which clearly differed between cells and viruses, as well as before and after virus inoculation into cells. These vibrational features, which allowed us to discuss viral assembly, membrane lipid evolution, and nucleoprotein interactions of the virus with the host cells, reflected the ability of the virus to alter host cells' pathways to enhance its replication efficiency. Upon comparing Raman signals from the host cells before and after virus inoculation, we were also able to discuss in detail cell metabolic reactions against the presence of the virus in terms of compositional variations of lipid species, the formation of fatty acids, dephosphorylation of high-energy adenosine triphosphate molecules, and enzymatic hydrolysis of the hemagglutinin glycoprotein.
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Affiliation(s)
- Giuseppe Pezzotti
- Faculty of Materials Science and Engineering, Ceramic Physics Laboratory, Kyoto Institute of Technology, Kyoto, Japan.,Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan.,The Center for Advanced Medical Engineering and Informatics, Osaka University, Osaka, Japan.,Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Wenliang Zhu
- Faculty of Materials Science and Engineering, Ceramic Physics Laboratory, Kyoto Institute of Technology, Kyoto, Japan
| | - Tetsuya Adachi
- Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.,Department of Dental Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoshi Horiguchi
- Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.,Department of Dental Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Elia Marin
- Faculty of Materials Science and Engineering, Ceramic Physics Laboratory, Kyoto Institute of Technology, Kyoto, Japan.,Department of Dental Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Francesco Boschetto
- Faculty of Materials Science and Engineering, Ceramic Physics Laboratory, Kyoto Institute of Technology, Kyoto, Japan.,Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Eriko Ogitani
- Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Osam Mazda
- Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Starciuc T, Tabary N, Paccou L, Duponchel L, Guinet Y, Martel B, Hédoux A. A detailed analysis of the influence of β-cyclodextrin derivates on the thermal denaturation of lysozyme. Int J Pharm 2019; 554:1-13. [DOI: 10.1016/j.ijpharm.2018.10.060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/24/2018] [Accepted: 10/26/2018] [Indexed: 12/07/2022]
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Sørensen KM, Westley C, Goodacre R, Engelsen SB. Simultaneous quantification of the boar-taint compounds skatole and androstenone by surface-enhanced Raman scattering (SERS) and multivariate data analysis. Anal Bioanal Chem 2015; 407:7787-95. [DOI: 10.1007/s00216-015-8945-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 07/14/2015] [Accepted: 07/28/2015] [Indexed: 10/23/2022]
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Correlation of TrpGly and GlyTrp Rotamer Structure with W7 and W10 UV Resonance Raman Modes and Fluorescence Emission Shifts. JOURNAL OF AMINO ACIDS 2012; 2012:735076. [PMID: 22888404 PMCID: PMC3408653 DOI: 10.1155/2012/735076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 05/04/2012] [Indexed: 11/18/2022]
Abstract
Tryptophyl glycine (TrpGly) and glycyl tryptophan (GlyTrp) dipeptides at pH 5.5 and pH 9.3 show a pattern of fluorescence emission shifts with the TrpGly zwitterion emission solely blue shifted. This pattern is matched by shifts in the UV resonance Raman (UVRR) W10 band position and the W7 Fermi doublet band ratio. Ab initio calculations show that the 1340 cm−1 band of the W7 doublet is composed of three modes, two of which determine the W7 band ratios for the dipeptides. Molecular dynamics simulations show that the dipeptides take on two conformations: one with the peptide backbone extended; one with the backbone curled over the indole. The dihedral angle critical to these conformations is χ1 and takes on three discrete values. Only the TrpGly zwitterion spends an appreciable amount of time in the extended backbone conformation as this is stabilized by two hydrogen bonds with the terminal amine cation. According to a Stark effect model, a positive charge near the pyrrole keeps the 1La transition at high energy, limiting fluorescence emission red shift, as observed for the TrpGly zwitterion. The hydrogen bond stabilized backbone provides a rationale for the Cmethylene-Cα-Ccarbonyl W10 symmetric stretch that is unique to the TrpGly zwitterion.
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Dieng SD, Schelvis JPM. Analysis of measured and calculated Raman spectra of indole, 3-methylindole, and tryptophan on the basis of observed and predicted isotope shifts. J Phys Chem A 2011; 114:10897-905. [PMID: 20860352 DOI: 10.1021/jp107295p] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aromatic amino acid tryptophan plays an important role in protein electron-transfer and in enzyme catalysis. Tryptophan is also used as a probe of its local protein environment and of dynamic changes in this environment. Raman spectroscopy of tryptophan has been an important tool to monitor tryptophan, its radicals, and its protein environment. The proper interpretation of the Raman spectra requires not only the correct assignment of Raman bands to vibrational normal modes but also the correct identification of the Raman bands in the spectrum. A significant amount of experimental and computational work has been devoted to this problem, but inconsistencies still persist. In this work, the Raman spectra of indole, 3-methylindole (3MI), tryptophan, and several of their isotopomers have been measured to determine the isotope shifts of the Raman bands. Density functional theory calculations with the B3LYP functional and the 6-311+G(d,p) basis set have been performed on indole, 3MI, 3-ethylindole (3EI), and several of their isotopomers to predict isotope shifts of the vibrational normal modes. Comparison of the observed and predicted isotope shifts results in a consistent assignment of Raman bands to vibrational normal modes that can be used for both assignment and identification of the Raman bands. For correct assignments, it is important to determine force field scaling factors for each molecule separately, and scaling factors of 0.9824, 0.9843, and 0.9857 are determined for indole, 3MI, and 3EI, respectively. It is also important to use more than one parameter to assign vibrational normal modes to Raman bands, for example, the inclusion of isotope shifts other than those obtained from H/D-exchange. Finally, the results indicate that the Fermi doublet of indole may consist of just two fundamentals, whereas one fundamental and one combination band are identified for the Fermi resonance that gives rise to the doublet in 3MI and tryptophan.
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Affiliation(s)
- Senghane D Dieng
- Department of Chemistry and Biochemistry, Montclair State University, 1 Normal Avenue, Montclair, New Jersey 07043, USA
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Herrero AM. Raman spectroscopy for monitoring protein structure in muscle food systems. Crit Rev Food Sci Nutr 2008; 48:512-23. [PMID: 18568857 DOI: 10.1080/10408390701537385] [Citation(s) in RCA: 217] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Raman spectroscopy offers structural information about complex solid systems such as muscle food proteins. This spectroscopic technique is a powerful and a non-invasive method for the study of protein changes in secondary structure, mainly quantified, analysing the amide I (1650-1680 cm(- 1)) and amide III (1200-1300 cm(- 1)) regions and C-C stretching band (940 cm(- 1)), as well as modifications in protein local environments (tryptophan residues, tyrosil doublet, aliphatic aminoacids bands) of muscle food systems. Raman spectroscopy has been used to determine structural changes in isolated myofibrillar and connective tissue proteins by the addition of different compounds and by the effect of the conservation process such as freezing and frozen storage. It has been also shown that Raman spectroscopy is particularly useful for monitoring in situ protein structural changes in muscle food during frozen storage. Besides, the possibilities of using protein structural changes of intact muscle to predict the protein functional properties and the sensory attributes of muscle foods have been also investigated. In addition, the application of Raman spectroscopy to study changes in the protein structure during the elaboration of muscle food products has been demonstrated.
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Affiliation(s)
- Ana M Herrero
- Departamento Nutrición, Bromatologia y Tecnologia de los Alimentos, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.
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Zhang F, Cai W, Sun Z, Zhang J. Regular variations in organic matrix composition of small yellow croaker (Pseudociaena polyactis) otoliths: an in situ Raman microspectroscopy and mapping study. Anal Bioanal Chem 2007; 390:777-82. [DOI: 10.1007/s00216-007-1695-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2007] [Revised: 09/17/2007] [Accepted: 10/10/2007] [Indexed: 10/22/2022]
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David O, Dedonder-Lardeux C, Jouvet C, Sobolewski AL. Role of the Intermolecular Vibrations in the Hydrogen Transfer Rate: The 3-Methylindole−NH3 Complex. J Phys Chem A 2006; 110:9383-7. [PMID: 16869687 DOI: 10.1021/jp062950y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The lifetimes of the 3-methylindole-NH3 complex have been measured on different vibronic levels involving intermolecular modes and decrease from 530 to 65 ps, in a mode specific manner. Geometry optimizations of the ground and excited states have been performed with ab initio methods, and as in the case of phenol and indole, a repulsive pi sigma* state lies close to the initially excited pi pi* state. From these calculations, it seems that both in-plane and out-of-plane vibrations induce a faster nonradiative decay.
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Affiliation(s)
- Olivier David
- Laboratoire de Photophysique Moléculaire du CNRS, Bât. 210, Université Paris-Sud, 91405 Orsay, France
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