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Spiliopoulou M, Valmas A, Triandafillidis DP, Fili S, Christopoulou M, Filopoulou AJ, Piskopou A, Papadea P, Fitch AN, Beckers D, Degen T, Gozzo F, Morin M, Reinle-Schmitt ML, Karavassili F, Rosmaraki E, Chasapis CT, Margiolaki I. High-throughput macromolecular polymorph screening via an NMR and X-ray powder diffraction synergistic approach: the case of human insulin co-crystallized with resorcinol derivatives. J Appl Crystallogr 2021. [DOI: 10.1107/s160057672100426x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Regular injections of insulin provide life-saving benefits to millions of diabetics. Apart from native insulin and insulin analogue formulations, microcrystalline insulin suspensions are also commercially available. The onset of action of the currently available basal insulins relies on the slow dissociation of insulin hexamers in the subcutaneous space due to the strong binding of small organic ligands. With the aim of identifying insulin–ligand complexes with enhanced pharmacokinetic and pharmacodynamic profiles, the binding affinity of two resorcinol-based molecules (4-chlororesorcinol and 4-bromoresorcinol) and the structural characteristics of insulin upon co-crystallization with them were investigated in the present study. `In solution' measurements were performed via saturation transfer difference (STD) NMR. Co-crystallization upon pH variation resulted in the production of polycrystalline precipitates, whose structural characteristics (i.e. unit-cell symmetry and dimension) were assessed. In both cases, different polymorphs (four and three, respectively) of monoclinic symmetry (P21 and C2 space groups) were identified via X-ray powder diffraction. The results demonstrate the efficiency of a new approach that combines spectroscopy and diffraction techniques and provides an innovative alternative for high-throughput examination of insulin and other therapeutic proteins.
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Spiliopoulou M, Karavassili F, Triandafillidis DP, Valmas A, Fili S, Kosinas C, Barlos K, Barlos KK, Morin M, Reinle-Schmitt ML, Gozzo F, Margiolaki I. New perspectives in macromolecular powder diffraction using single-photon-counting strip detectors: high-resolution structure of the pharmaceutical peptide octreotide. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 2021; 77:186-195. [PMID: 33944797 DOI: 10.1107/s2053273321001698] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 02/11/2021] [Indexed: 11/10/2022]
Abstract
Advances in instrumentation, as well as the development of powerful crystallographic software have significantly facilitated the collection of high-resolution diffraction data and have made X-ray powder diffraction (XRPD) particularly useful for the extraction of structural information; this is true even for complex molecules, especially when combined with synchrotron radiation. In this study, in-line with past instrumental profile studies, an improved data collection strategy exploiting the MYTHEN II detector system together with significant beam focusing and tailored data collection options was introduced and optimized for protein samples at the Material Science beamline at the Swiss Light Source. Polycrystalline precipitates of octreotide, a somatostatin analog of particular pharmaceutical interest, were examined with this novel approach. XRPD experiments resulted in high angular and d-spacing (1.87 Å) resolution data, from which electron-density maps of enhanced quality were extracted, revealing the molecule's structural properties. Since microcrystalline precipitates represent a viable alternative for administration of therapeutic macromolecules, XRPD has been acknowledged as the most applicable tool for examining a wide spectrum of physicochemical properties of such materials and performing studies ranging from phase identification to complete structural characterization.
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Affiliation(s)
- Maria Spiliopoulou
- Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, Patras, GR-26500, Greece
| | - Fotini Karavassili
- Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, Patras, GR-26500, Greece
| | | | - Alexandros Valmas
- Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, Patras, GR-26500, Greece
| | - Stavroula Fili
- Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, Patras, GR-26500, Greece
| | - Christos Kosinas
- Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, Patras, GR-26500, Greece
| | | | | | - Mickael Morin
- Excelsus Structural Solutions (Swiss) AG, Park Innovaare, Villigen, 5234, Switzerland
| | | | - Fabia Gozzo
- Excelsus Structural Solutions (Swiss) AG, Park Innovaare, Villigen, 5234, Switzerland
| | - Irene Margiolaki
- Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, Patras, GR-26500, Greece
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Singh VK, Verma SK, Kadu R, Mobin SM. Identification of unusual C–Cl⋯π contacts in 2-(alkylamino)-3-chloro-1,4-naphthoquinones: effect of N-substituents on crystal packing, fluorescence, redox and anti-microbial properties. RSC Adv 2015. [DOI: 10.1039/c5ra02295a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
XRD study demonstrates the opening of unusual C–Cl⋯π synthon in 2-(alkylamino)-3-chloro-1,4-naphthoquinone. Notably, compound holding N-pyridylmethyl exhibits enhanced activity against S. aureus and proved to be more potent than ciprofloxacin.
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Affiliation(s)
- Vinay K. Singh
- Department of Chemistry
- Faculty of Science
- The M. S. University of Baroda
- Vadodara-390 002
- India
| | - Sanjay K. Verma
- Department of Chemistry
- Faculty of Science
- The M. S. University of Baroda
- Vadodara-390 002
- India
| | - Rahul Kadu
- Department of Chemistry
- Faculty of Science
- The M. S. University of Baroda
- Vadodara-390 002
- India
| | - Shaikh M. Mobin
- National Single Crystal X-ray Diffraction Facility
- IIT Bombay
- Mumbai 400 076
- India
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Sayil C, Kurban S, Ibis C. Synthesis and Characterization of Nitrogen and Sulfur Containing 1,4-Naphthoquinones. PHOSPHORUS SULFUR 2013. [DOI: 10.1080/10426507.2013.796475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Cigdem Sayil
- a Department of Chemistry , Faculty of Engineering, Istanbul University , Avcilar-Istanbul , Turkey
| | - Semih Kurban
- a Department of Chemistry , Faculty of Engineering, Istanbul University , Avcilar-Istanbul , Turkey
| | - Cemil Ibis
- a Department of Chemistry , Faculty of Engineering, Istanbul University , Avcilar-Istanbul , Turkey
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