1
|
Ferri L, Menghi V, Licchetta L, Dimartino P, Minardi R, Davì C, Di Vito L, Cifaldi E, Zenesini C, Gozzo F, Pelliccia V, Mariani V, de Spelorzi YCC, Gustincich S, Seri M, Tassi L, Pippucci T, Bisulli F. Detection of somatic and germline pathogenic variants in adult cohort of drug-resistant focal epilepsies. Epilepsy Behav 2024; 153:109716. [PMID: 38508103 DOI: 10.1016/j.yebeh.2024.109716] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 02/20/2024] [Accepted: 02/21/2024] [Indexed: 03/22/2024]
Abstract
OBJECTIVE This study investigates the prevalence of pathogenic variants in the mechanistic target of rapamycin (mTOR) pathway in surgical specimens of malformations of cortical development (MCDs) and cases with negative histology. The study also aims to evaluate the predictive value of genotype-histotype findings on the surgical outcome. METHODS The study included patients with drug-resistant focal epilepsy who underwent epilepsy surgery. Cases were selected based on histopathological diagnosis, focusing on MCDs and negative findings. We included brain tissues both as formalin-fixed, paraffin-embedded (FFPE) or fresh frozen (FF) samples. Single-molecule molecular inversion probes (smMIPs) analysis was conducted, targeting the MTOR gene in FFPE samples and 10 genes within the mTOR pathway in FF samples. Correlations between genotype-histotype and surgical outcome were examined. RESULTS We included 78 patients for whom we obtained 28 FFPE samples and 50 FF tissues. Seventeen pathogenic variants (22 %) were identified and validated, with 13 being somatic within the MTOR gene and 4 germlines (2 DEPDC5, 1 TSC1, 1 TSC2). Pathogenic variants in mTOR pathway genes were exclusively found in FCDII and TSC cases, with a significant association between FCD type IIb and MTOR genotype (P = 0.003). Patients carrying mutations had a slightly better surgical outcome than the overall cohort, however it results not significant. The FCDII diagnosed cases more frequently had normal neuropsychological test, a higher incidence of auras, fewer multiple seizure types, lower occurrence of seizures with awareness impairment, less ictal automatisms, fewer Stereo-EEG investigations, and a longer period long-life of seizure freedom before surgery. SIGNIFICANCE This study confirms that somatic MTOR variants represent the primary genetic alteration detected in brain specimens from FCDII/TSC cases, while germline DEPDC5, TSC1/TSC2 variants are relatively rare. Systematic screening for these mutations in surgically treated patients' brain specimens can aid histopathological diagnoses and serve as a biomarker for positive surgical outcomes. Certain clinical features associated with pathogenic variants in mTOR pathway genes may suggest a genetic etiology in FCDII patients.
Collapse
Affiliation(s)
- L Ferri
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy; Department of Biomedical and NeuroMotor Sciences, University of Bologna, Via Massarenti, 9 - Pad. 11 - 40138 Bologna, Italy
| | - V Menghi
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Via Massarenti, 9 - Pad. 11 - 40138 Bologna, Italy; Neurology Unit, Rimini "Infermi" Hospital-AUSL Romagna, Rimini, Italy
| | - L Licchetta
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy
| | - P Dimartino
- Department of Medical and Surgical Sciences, University of Bologna, Via Massarenti, 9 - Pad. 11 - 40138 Bologna, Italy
| | - R Minardi
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy
| | - C Davì
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy
| | - L Di Vito
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy
| | - E Cifaldi
- IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy; Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
| | - C Zenesini
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy
| | - F Gozzo
- Claudio Munari Epilepsy Surgery Center, Niguarda Hospital, Milano, Italy
| | - V Pelliccia
- Claudio Munari Epilepsy Surgery Center, Niguarda Hospital, Milano, Italy
| | - V Mariani
- Neurology and Stroke Unit, ASST Santi Paolo e Carlo, Presidio San Carlo Borromeo, Milano, Italy
| | - Y C C de Spelorzi
- Genomics Facility, Istituto Italiano di Tecnologia (IIT), Genova, Italy
| | - S Gustincich
- Center for Human Technologies, Non-coding RNAs and RNA-based Therapeutics, Istituto Italiano di Tecnologia (IIT), Genova, Italy
| | - M Seri
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Via Massarenti, 9 - Pad. 11 - 40138 Bologna, Italy; IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - L Tassi
- Claudio Munari Epilepsy Surgery Center, Niguarda Hospital, Milano, Italy
| | - T Pippucci
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Via Massarenti, 9 - Pad. 11 - 40138 Bologna, Italy; IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - F Bisulli
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Epilepsy Center (full member of the European Reference Network EpiCARE), Via Altura 3, Bologna 40139, Italy; Department of Biomedical and NeuroMotor Sciences, University of Bologna, Via Massarenti, 9 - Pad. 11 - 40138 Bologna, Italy.
| |
Collapse
|
2
|
Reinle-Schmitt M, Šišak Jung D, Morin M, Costa F, Casati N, Gozzo F. Exploring high-throughput synchrotron X-Ray powder diffraction for the structural analysis of pharmaceuticals. Int J Pharm X 2023; 6:100221. [PMID: 38146324 PMCID: PMC10749245 DOI: 10.1016/j.ijpx.2023.100221] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 11/20/2023] [Accepted: 11/27/2023] [Indexed: 12/27/2023] Open
Abstract
Synchrotron radiation offers a host of advanced properties, surpassing conventional laboratory sources with its high brightness, tunable phonon energy, photon beam coherence for advanced X-ray imaging, and a structured time profile, ideal for capturing dynamic atomic and molecular processes. However, these benefits come at the cost of operational complexity and expenses. Three decades ago, synchrotron radiation facilities, while technically open to all scientists, primarily served a limited community. Despite substantial accessibility improvements over the past two decades, synchrotron measurements still do not qualify as routine analyses. The intrinsic complexity of synchrotron science means experiments are pursued only when no alternatives suffice. In recent years, strides have been made in technology transfer offices, intermediate synchrotron-based analytical service companies, and the development of high-throughput synchrotron systems at various facilities, reshaping the perception of synchrotron science. This article investigates the practical application of synchrotron X-Ray Powder Diffraction (s-XRPD) techniques in pharmaceutical analysis. By utilizing concrete examples, we demonstrate how high-throughput systems have the potential to revolutionize s-XRPD applications in the pharmaceutical industry, rapidly generating XRPD patterns of comparable or superior quality to those obtained in state-of-the-art laboratory XRPD, all in less than 5 s. Additional cases featuring well-established pharmaceutical active ingredients (API) and excipients substantiate the concept of high throughput in pharmaceuticals, affirming data quality through structural refinements aligned with literature-derived unit cell parameters. Synchrotron data need not always be state-of-the-art to compete with lab-XRPD data. The key lies in ensuring user-friendliness, reproducibility, accessibility, cost-effectiveness, and the streamlined efforts associated with synchrotron instrumentation to remain highly competitive with their laboratory counterparts.
Collapse
Affiliation(s)
- M. Reinle-Schmitt
- Excelsus Structural Solutions (Swiss) AG, PARK INNOVAARE, 5234 Villigen, Switzerland
| | - D. Šišak Jung
- DECTRIS, Täfernweg 1, 5405 Baden-Dättwil, Switzerland
| | - M. Morin
- Excelsus Structural Solutions (Swiss) AG, PARK INNOVAARE, 5234 Villigen, Switzerland
| | - F.N. Costa
- Excelsus Structural Solutions (Swiss) AG, PARK INNOVAARE, 5234 Villigen, Switzerland
| | - N. Casati
- Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - F. Gozzo
- Excelsus Structural Solutions (Swiss) AG, PARK INNOVAARE, 5234 Villigen, Switzerland
| |
Collapse
|
3
|
Benmore CJ, Benmore SR, Edwards AD, Shrader CD, Bhat MH, Cherry BR, Smith P, Gozzo F, Shi C, Smith D, Yarger JL, Byrn SR, Weber JKR. A High Energy X-ray Diffraction Study of Amorphous Indomethacin. J Pharm Sci 2022; 111:818-824. [PMID: 34890631 PMCID: PMC11064786 DOI: 10.1016/j.xphs.2021.12.003] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/02/2021] [Accepted: 12/02/2021] [Indexed: 11/18/2022]
Abstract
Amorphous pharmaceuticals often possess a wide range of molecular conformations and bonding arrangements. The x-ray pair distribution function (PDF) method is a powerful technique for the characterization of variations in both intra-molecular and inter-molecular packing arrangements. Here, the x-ray PDF of amorphous Indomethacin is shown to be particularly sensitive to the preferred orientations of the chlorobenzyl ring found in isomers in the crystalline state. In some cases, the chlorobenzyl ring has no preferred torsional angle in the amorphous form, while in others evidence of distinct isomer orientations are observed. Amorphous samples with no preferred torsion angles of the chlorobenzyl ring are found to favor enhanced inter-molecular hydrogen bonding, and this is reflected in the intensity of the first sharp diffraction peak. These significant variations in structure rule out amorphous Indomethacin as a possible standard for x-ray PDF measurements. At high humidity, time resolved PDF's for >40 h reveal water molecules forming hydrogen bonds with Indomethacin molecules. A simple linear hydrogen bond model indicates that water molecules in the wet amorphous form have similar hydrogen bond strengths to those found between Indomethacin dimers or chains in the dry amorphous form.
Collapse
Affiliation(s)
- C J Benmore
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States of America; Arizona State University, Tempe, AZ 85281, United States of America.
| | - S R Benmore
- Materials Development, Inc., Arlington Heights, IL 60004, United States of America
| | - A D Edwards
- Arizona State University, Tempe, AZ 85281, United States of America
| | - C D Shrader
- Arizona State University, Tempe, AZ 85281, United States of America
| | - M H Bhat
- Arizona State University, Tempe, AZ 85281, United States of America
| | - B R Cherry
- Arizona State University, Tempe, AZ 85281, United States of America
| | - P Smith
- Improved Pharma, West Lafayette, IN 47906, United States of America
| | - F Gozzo
- Excelsus Structural Solutions, Park Innovaare, 5234 Villigen, Switzerland
| | - C Shi
- Data Science Consulting, Tiger Analytics, Santa Clara, CA 95054
| | - D Smith
- Improved Pharma, West Lafayette, IN 47906, United States of America; Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, IN 47906, United States of America
| | - J L Yarger
- Arizona State University, Tempe, AZ 85281, United States of America
| | - S R Byrn
- Improved Pharma, West Lafayette, IN 47906, United States of America; Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, IN 47906, United States of America
| | - J K R Weber
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States of America; Materials Development, Inc., Arlington Heights, IL 60004, United States of America
| |
Collapse
|
4
|
Morais SB, Pirolla RAS, Frota NF, Lourenzoni MR, Gozzo FC, Souza TACB. The role of the quaternary structure in the activation of human L-asparaginase. J Proteomics 2020; 224:103818. [PMID: 32434038 DOI: 10.1016/j.jprot.2020.103818] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 04/30/2020] [Accepted: 05/09/2020] [Indexed: 11/25/2022]
Abstract
Human L-asparaginase-like protein 1 (ASRGL1) has hydrolytic activity against L-asparagine and isoaspartyl dipeptides. As an N-terminal nucleophile hydrolase family member, its activation depends on an intramolecular autoprocessing step between G167 and T168. In vitro, autoprocessing reaches only 50% completion, which restrains the activity and hampers the full understanding of the activation process. The ASRGL1 dimer interface plays a critical role in intramolecular processing, and the interactions within oligomers can offer relevant information about autoprocessing. In this work, a fully processed trimeric conformation of ASRGL1 was observed for the first time, and we combined biophysical and structural proteomics assays to characterize trimeric ASRGL1. Our analyses show that oligomerization is critical for autoprocessing, hydrolytic activity and thermal stability. The newest trimeric ASRGL1 conformation enhances protein activity and presents a melting temperature deviation of 4.33 °C in comparison to the monomeric conformation. The interaction of the third monomer in the trimeric conformation is driven by an α-helix comprising residues KVNLARLTLF (227-236).
Collapse
Affiliation(s)
- S B Morais
- Structural and Computational Proteomics Laboratory, Carlos Chagas Institute, FIOCRUZ-PR, Curitiba/PR 80320-290, Brazil
| | - R A S Pirolla
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970, Brazil
| | - N F Frota
- Postgraduate Program in Natural Resource Biotechnology, Federal University of Ceara, Campus do Pici, Fortaleza/CE, 60356-000, Brazil
| | - M R Lourenzoni
- Postgraduate Program in Natural Resource Biotechnology, Federal University of Ceara, Campus do Pici, Fortaleza/CE, 60356-000, Brazil; Protein Engineering and Healthcare Solutions Research Group, FIOCRUZ-CE, Eusebio/CE, 61760-000, Brazil
| | - F C Gozzo
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970, Brazil
| | - T A C B Souza
- Structural and Computational Proteomics Laboratory, Carlos Chagas Institute, FIOCRUZ-PR, Curitiba/PR 80320-290, Brazil.
| |
Collapse
|
5
|
Cossu M, Raneri F, Casaceli G, Gozzo F, Pelliccia V, Lo Russo G. Surgical treatment of cavernoma-related epilepsy. J Neurosurg Sci 2015; 59:237-253. [PMID: 25968926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Cerebral cavernous malformations (CCMs) are frequently associated with a seizure disorder, and the risk of developing drug-resistant epilepsy (DRE) is substantial, especially for temporal lobe lesions. This article includes a review of the literature on the surgical treatment of epilepsy associated to CCMs in the magnetic resonance imaging (MRI) era, as well as an analysis of the Authors' experience in this field. It is concluded that microsurgery is a valuable treatment option, which may provide excellent results on seizures, with 76% of patients on average being seizure-free after surgery. Nevertheless, the optimal surgical strategy to achieve seizure control has not been clearly identified, and several attitudes have been reported in the literature. The choice of lesionectomy, associated or not to removal of surrounding hemosiderin, versus resections extended to epileptogenic cortex depends on the accurate scrutiny of several factors, which should be investigated through an adequate epileptological presurgical workup. This should include an epilepsy-oriented brain MRI study, integrated by an appropriate neurophysiological and clinical assessment, and if needed by other functional evaluations. Besides representing the optimal option in CCM-related DRE cases, microsurgery should be considered also at seizure presentation or in cases with recent-onset sporadic seizures, to protect the patient from both the possible development of drug resistance and the risk of haemorrhage.
Collapse
Affiliation(s)
- M Cossu
- "C. Munari" Centre for Epilepsy Surgery, Niguarda Ca' Granda Hospital, Milan, Italy -
| | | | | | | | | | | |
Collapse
|
6
|
Fili S, Valmas A, Norrman M, Schluckebier G, Beckers D, Degen T, Wright J, Fitch A, Gozzo F, Giannopoulou AE, Karavassili F, Margiolaki I. Human insulin polymorphism upon ligand binding and pH variation: the case of 4-ethylresorcinol. IUCrJ 2015; 2:534-44. [PMID: 26306195 PMCID: PMC4547821 DOI: 10.1107/s2052252515013159] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 07/08/2015] [Indexed: 06/04/2023]
Abstract
This study focuses on the effects of the organic ligand 4-ethylresorcinol on the crystal structure of human insulin using powder X-ray crystallography. For this purpose, systematic crystallization experiments have been conducted in the presence of the organic ligand and zinc ions within the pH range 4.50-8.20, while observing crystallization behaviour around the isoelectric point of insulin. High-throughput crystal screening was performed using a laboratory X-ray diffraction system. The most representative samples were selected for synchrotron X-ray diffraction measurements, which took place at the European Synchrotron Radiation Facility (ESRF) and the Swiss Light Source (SLS). Four different crystalline polymorphs have been identified. Among these, two new phases with monoclinic symmetry have been found, which are targets for the future development of microcrystalline insulin drugs.
Collapse
Affiliation(s)
- S. Fili
- Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, GR-26500 Patras, Greece
| | - A. Valmas
- Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, GR-26500 Patras, Greece
| | - M. Norrman
- Diabetes Protein Engineering, Novo Nordisk A/S, Novo Nordisk Park, DK-2760 Malov, Denmark
| | - G. Schluckebier
- Diabetes Protein Engineering, Novo Nordisk A/S, Novo Nordisk Park, DK-2760 Malov, Denmark
| | - D. Beckers
- PANalytical B.V., Lelyweg 1, 7602 EA Almelo, The Netherlands
| | - T. Degen
- PANalytical B.V., Lelyweg 1, 7602 EA Almelo, The Netherlands
| | - J. Wright
- European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble CEDEX 9, France
| | - A. Fitch
- European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble CEDEX 9, France
| | - F. Gozzo
- Excelsus Structural Solutions, Belgium
| | - A. E. Giannopoulou
- Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, GR-26500 Patras, Greece
| | - F. Karavassili
- Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, GR-26500 Patras, Greece
| | - I. Margiolaki
- Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, GR-26500 Patras, Greece
| |
Collapse
|
7
|
Valmas A, Magiouf K, Fili S, Norrman M, Schluckebier G, Beckers D, Degen T, Wright J, Fitch A, Gozzo F, Giannopoulou AE, Karavassili F, Margiolaki I. Novel crystalline phase and first-order phase transitions of human insulin complexed with two distinct phenol derivatives. ACTA ACUST UNITED AC 2015; 71:819-28. [DOI: 10.1107/s1399004715001376] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 01/21/2015] [Indexed: 11/11/2022]
Abstract
The primary focus of the present work is the study of the effects that two ligands and the crystallization pH have on the crystalline forms of human insulin. For this purpose, human insulin (HI) was co-crystallized with two distinct phenolic derivatives: the organic ligandsmeta-cresol (m-cresol) and 4-nitrophenol. The formation of polycrystalline precipitates was then followed by means of structural characterization of the individual specimens in terms of unit-cell symmetry and parameters. In both cases, two different polymorphs were identifiedviaX-ray powder diffraction measurements, the first of hexagonal symmetry (R3 space group) at higher pH values and the second of monoclinic symmetry (space groupP21) with unit-cell parametersa= 87.4282 (5),b = 70.5020 (3),c= 48.3180 (4) Å, β = 106.8958 (4)°, the latter of which to our knowledge has never been observed before.
Collapse
|
8
|
De Momi E, Caborni C, Cardinale F, Casaceli G, Castana L, Cossu M, Mai R, Gozzo F, Francione S, Tassi L, Lo Russo G, Antiga L, Ferrigno G. Multi-trajectories automatic planner for StereoElectroEncephaloGraphy (SEEG). Int J Comput Assist Radiol Surg 2014; 9:1087-97. [PMID: 24748210 DOI: 10.1007/s11548-014-1004-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 04/02/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE StereoElectroEncephaloGraphy (SEEG) is done to identify the epileptogenic zone of the brain using several multi-lead electrodes whose positions in the brain are pre-operatively defined. Intracranial hemorrhages due to disruption of blood vessels can cause major complications of this procedure ([Formula: see text]1%). In order to increase the intervention safety, we developed and tested planning tools to assist neurosurgeons in choosing the best trajectory configuration. METHODS An automated planning method was developed that maximizes the distance of the electrode from the vessels and avoids the sulci as entry points. The angle of the guiding screws is optimized to reduce positioning error. The planner was quantitatively and qualitatively compared with manually computed trajectories on 26 electrodes planned for three patients undergoing SEEG by four neurosurgeons. Quantitative comparison was performed computing for each trajectory using (a) the Euclidean distance from the closest vessel and (b) the incidence angle. RESULTS Quantitative evaluation shows that automatic planned trajectories are safer in terms of distance from the closest vessel with respect to manually planned trajectories. Qualitative evaluation performed by four neurosurgeons showed that the automatically computed trajectories would have been preferred to manually computed ones in 30% of the cases and were judged good or acceptable in about 86% of the cases. A significant reduction in time required for planning was observed with the automated system (approximately 1/10). CONCLUSION The automatic SEEG electrode planner satisfied the essential clinical requirements, by providing safe trajectories in an efficient timeframe.
Collapse
Affiliation(s)
- E De Momi
- Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, Italy.
| | - C Caborni
- Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, Italy
| | - F Cardinale
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - G Casaceli
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - L Castana
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - M Cossu
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - R Mai
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - F Gozzo
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - S Francione
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - L Tassi
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | - G Lo Russo
- "Claudio Munari" Centre for Epilepsy and Parkinson Surgery Ospedale Niguarda Ca' Granda, Milan, Italy
| | | | - G Ferrigno
- Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, Italy
| |
Collapse
|
9
|
Willmott PR, Meister D, Leake SJ, Lange M, Bergamaschi A, Böge M, Calvi M, Cancellieri C, Casati N, Cervellino A, Chen Q, David C, Flechsig U, Gozzo F, Henrich B, Jäggi-Spielmann S, Jakob B, Kalichava I, Karvinen P, Krempasky J, Lüdeke A, Lüscher R, Maag S, Quitmann C, Reinle-Schmitt ML, Schmidt T, Schmitt B, Streun A, Vartiainen I, Vitins M, Wang X, Wullschleger R. The Materials Science beamline upgrade at the Swiss Light Source. J Synchrotron Radiat 2013; 20:667-82. [PMID: 23955029 PMCID: PMC3747948 DOI: 10.1107/s0909049513018475] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 07/03/2013] [Indexed: 05/20/2023]
Abstract
The Materials Science beamline at the Swiss Light Source has been operational since 2001. In late 2010, the original wiggler source was replaced with a novel insertion device, which allows unprecedented access to high photon energies from an undulator installed in a medium-energy storage ring. In order to best exploit the increased brilliance of this new source, the entire front-end and optics had to be redesigned. In this work, the upgrade of the beamline is described in detail. The tone is didactic, from which it is hoped the reader can adapt the concepts and ideas to his or her needs.
Collapse
Affiliation(s)
- P R Willmott
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Apparicio M, Ferreira CR, Tata A, Santos VG, Alves AE, Mostachio GQ, Pires-Butler EA, Motheo TF, Padilha LC, Pilau EJ, Gozzo FC, Eberlin MN, Lo Turco EG, Luvoni GC, Vicente WRR. Chemical Composition of Lipids Present in Cat and Dog Oocyte by Matrix-Assisted Desorption Ionization Mass Spectrometry (MALDI- MS). Reprod Domest Anim 2012; 47 Suppl 6:113-7. [DOI: 10.1111/rda.12003] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- M Apparicio
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| | - CR Ferreira
- ThomSon Mass Spectrometry Laboratory; UNICAMP; Institute of Chemistry; University of Campinas; Campinas; SP; Brazil
| | - A Tata
- ThomSon Mass Spectrometry Laboratory; UNICAMP; Institute of Chemistry; University of Campinas; Campinas; SP; Brazil
| | - VG Santos
- ThomSon Mass Spectrometry Laboratory; UNICAMP; Institute of Chemistry; University of Campinas; Campinas; SP; Brazil
| | - AE Alves
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| | - GQ Mostachio
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| | - EA Pires-Butler
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| | - TF Motheo
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| | - LC Padilha
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| | - EJ Pilau
- Dalton Mass Spectrometry Laboratory; UNICAMP; Institute of Chemistry; University of Campinas; Campinas; SP; Brazil
| | - FC Gozzo
- Dalton Mass Spectrometry Laboratory; UNICAMP; Institute of Chemistry; University of Campinas; Campinas; SP; Brazil
| | - MN Eberlin
- ThomSon Mass Spectrometry Laboratory; UNICAMP; Institute of Chemistry; University of Campinas; Campinas; SP; Brazil
| | - EG Lo Turco
- Department of Surgery; Division of Urology; Human Reproduction Section; Sao Paulo Federal University; Sao Paulo; SP; Brazil
| | - GC Luvoni
- Dipartimento di Scienze Veterinarie per la Salute; la Produzione Animale e la Sicurezza Alimentare; Università degli Studi di Milano; Milan; Italy
| | - WRR Vicente
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal; FCAV, UNESP-Univ Estadual Paulista; Jaboticabal; SP; Brazil
| |
Collapse
|
11
|
Proserpio P, Cossu M, Francione S, Gozzo F, Lo Russo G, Mai R, Moscato A, Schiariti M, Sartori I, Tassi L, Nobili L. Epileptic motor behaviors during sleep: anatomo-electro-clinical features. Sleep Med 2012; 12 Suppl 2:S33-8. [PMID: 22136897 DOI: 10.1016/j.sleep.2011.10.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 10/11/2011] [Accepted: 10/13/2011] [Indexed: 10/15/2022]
Abstract
BACKGROUND Sleep-related complex motor seizures have long been considered pathognomonic features of Nocturnal Frontal Lobe Epilepsy (NFLE). In recent years, these manifestations have also been reported to have a temporal or insular origin. METHOD We describe 40 drug-resistant epileptic patients with complex motor seizures during sleep, submitted to presurgical stereo-EEG (SEEG) evaluation and seizure-free after surgical resection of the epileptogenic zone. RESULTS In a significant proportion (30%) of these patients, seizures arose from extra-frontal regions, including mainly the temporal lobe and the insular cortex, but also the parietal and occipital lobes. In patients with extra-frontal epilepsy, when complex motor behaviors appeared, SEEG revealed that the ictal discharge involved the cingulate and the frontal regions. Finally, at histology, Taylor's focal cortical dysplasia (TFCD) was the most common finding (90% of patients), independent of the site of seizure onset. CONCLUSION As previously reported by other studies, this histologic substrate may be a major determinant of sleep-related seizures in drug-resistant epileptic patients.
Collapse
Affiliation(s)
- P Proserpio
- C Munari Centre of Epilepsy Surgery, Niguarda Hospital, Milan, Italy
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Macchi P, Casati N, Gozzo F, Simoncic P, Tiana D. High-pressure structure of Mn 2(CO) 10: an off-axis M- Mbond. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311087186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
13
|
Salimi AR, Eshtiagh-Hosseini H, Sadeghian H, Gozzo F, Amini MM, Khavasi HR. Ab initiostructure determination of a new phosphodiesterase enzyme inhibitor. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311093184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
14
|
Grässlin J, McCusker LB, Baerlocher C, Gozzo F, Schmitt B, Lutterotti L. More reliable intensity extraction from powders using texture. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311079761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
15
|
Rodríguez MA, Cabrera G, Gozzo FC, Eberlin MN, Godeas A. Clonostachys rosea BAFC3874 as a Sclerotinia sclerotiorum antagonist: mechanisms involved and potential as a biocontrol agent. J Appl Microbiol 2011; 110:1177-86. [PMID: 21385290 DOI: 10.1111/j.1365-2672.2011.04970.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIMS To establish the modes of action of the antagonistic fungal strain Clonostachys rosea BAFC3874 isolated from suppressive soils against Sclerotinia sclerotiorum and to determine its potential as a biocontrol agent. METHODS AND RESULTS The antagonistic activity of C. rosea BAFC3874 was determined in vitro by dual cultures. The strain effectively antagonized S. sclerotiorum in pot-grown lettuce and soybean plants. Antifungal activity assays of C. rosea BAFC3874 grown in culture established that the strain produced antifungal compounds against S. sclerotiorum associated with secondary metabolism. High mycelial growth inhibition coincided with sclerotia production inhibition. The C. rosea strain produced a microheterogeneous mixture of peptides belonging to the peptaibiotic family. Moreover, mycoparasitism activity was observed in the dual culture. CONCLUSIONS Clonostachys rosea strain BAFC3874 was proved to be an effective antagonist against the aggressive soil-borne pathogen S. sclerotiorum in greenhouse experiments. The main mechanisms involve peptaibiotic metabolite production and mycoparasitism activity. SIGNIFICANCE AND IMPACT OF THE STUDY Clonostachys rosea BAFC3874 may be a good fungal biological control agent against S. sclerotiorum. In addition, we were also able to isolate and identify peptaibols, an unusual family of compounds in this genus of fungi.
Collapse
Affiliation(s)
- M A Rodríguez
- Departamento de Biodiversidad y Biología Experimental, Universidad de Buenos Aires, Buenos Aires, Argentina.
| | | | | | | | | |
Collapse
|
16
|
Lebedev O, Caignaert V, Raveau B, Pop N, Gozzo F, Van Tendeloo G, Pralong V. HRTEM and neutron diffraction study of LixMo5O17: From the ribbon (x=5) structure to the rock salt (x=12) structure. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.02.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
17
|
Nygård K, Gorelick S, Vila-Comamala J, Färm E, Bergamaschi A, Cervellino A, Gozzo F, Patterson BD, Ritala M, David C. Beam-induced damage on diffractive hard X-ray optics. J Synchrotron Radiat 2010; 17:786-90. [PMID: 20975225 PMCID: PMC2964115 DOI: 10.1107/s0909049510028487] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Accepted: 07/16/2010] [Indexed: 05/30/2023]
Abstract
The issue of beam-induced damage on diffractive hard X-ray optics is addressed. For this purpose a systematic study on the radiation damage induced by a high-power X-ray beam is carried out in both ambient and inert atmospheres. Diffraction gratings fabricated by three different techniques are considered: electroplated Au gratings both with and without the polymer mold, and Ir-coated Si gratings. The beam-induced damage is monitored by X-ray diffraction and evaluated using scanning electron microscopy.
Collapse
Affiliation(s)
- K Nygård
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Rasch JC, Sheptyakov D, Schefer J, Keller L, Boehm M, Gozzo F, Volkov N, Sablina K, Petrakovskii G, Grimmer H, Conder K, Löffler J. Structural properties of determined from high-resolution synchrotron powder diffraction. J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2009.02.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
19
|
Niederwanger V, Gozzo F, Griesser U. Characterization of Four Crystal Polymorphs and a Monohydrate of S-Bupivacaine Hydrochloride (Levobupivacaine Hydrochloride). J Pharm Sci 2009; 98:1064-74. [DOI: 10.1002/jps.21496] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
20
|
Burla M, Altomare A, Cuocci C, Belviso B, Giacovazzo C, Gozzo F, Moliterni A, Polidori G, Rizzi R. MAD techniques applied to powder data: the method of the joint probability distribution functions. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308096980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
21
|
Lee S, Pirogov A, Kang M, Jang KH, Yonemura M, Kamiyama T, Cheong SW, Gozzo F, Shin N, Kimura H, Noda Y, Park JG. Giant magneto-elastic coupling in multiferroic hexagonal manganites. Nature 2008; 451:805-8. [PMID: 18273014 DOI: 10.1038/nature06507] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Accepted: 11/29/2007] [Indexed: 11/09/2022]
Abstract
The motion of atoms in a solid always responds to cooling or heating in a way that is consistent with the symmetry of the given space group of the solid to which they belong. When the atoms move, the electronic structure of the solid changes, leading to different physical properties. Therefore, the determination of where atoms are and what atoms do is a cornerstone of modern solid-state physics. However, experimental observations of atomic displacements measured as a function of temperature are very rare, because those displacements are, in almost all cases, exceedingly small. Here we show, using a combination of diffraction techniques, that the hexagonal manganites RMnO3 (where R is a rare-earth element) undergo an isostructural transition with exceptionally large atomic displacements: two orders of magnitude larger than those seen in any other magnetic material, resulting in an unusually strong magneto-elastic coupling. We follow the exact atomic displacements of all the atoms in the unit cell as a function of temperature and find consistency with theoretical predictions based on group theories. We argue that this gigantic magneto-elastic coupling in RMnO3 holds the key to the recently observed magneto-electric phenomenon in this intriguing class of materials.
Collapse
Affiliation(s)
- Seongsu Lee
- Department of Physics, SungKyunKwan University, Suwon 440-746, Korea
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Gozzo F, De Caro L, Giannini C, Guagliardi A, Schmitt B. Modeling the IRF of synchrotron powder diffractometers with focusing optics. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305094249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
23
|
Heimann AS, Favarato MH, Gozzo FC, Rioli V, Carreño FR, Eberlin MN, Ferro ES, Krege JH, Krieger JE. ACE gene titration in mice uncovers a new mechanism for ACE on the control of body weight. Physiol Genomics 2004; 20:173-82. [PMID: 15522949 DOI: 10.1152/physiolgenomics.00145.2004] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Mice harboring 1, 2, or 3 copies of the angiotensin-converting enzyme (ACE) gene were used to evaluate the quantitative role of the ACE locus on obesity. Three-copy mice fed with a high-fat diet had lower body weight and peri-epididymal adipose tissue than did 1- and 2-copy mice (P < 0.05). On regular diet, 3-copy mice had to eat more to maintain the same body weight; on a high-fat diet, they ate the same but weighed less than 1- and 2-copy mice (P < 0.05), indicating a higher metabolic rate in 3-copy mice that was not affected by ANG II AT(1) blocker treatment. A catalytically inactive form of thimet oligopeptidase (EC 3.4.24.15; EP24.15) was used to isolate ACE substrates from adipose tissue. Liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) identified 162 peptide peaks; 16 peptides were present in both groups (1- and 3-copy mice fed with a high-fat diet), whereas 58 of the 72 unique peptides were found only in the 3-copy mice. Peptide size distribution was shifted to lower molecular weight in 3-copy mice. Two of the identified peptides, LVVYPWTQRY and VVYPWTQRY, which are ACE substrates, inhibited in vitro protein kinase C phosphorylation in a concentration-dependent manner. In addition, neurolysin (EC 3.4.24.16; EP24.16) activity was lower in fat tissue from 3- vs. 1-copy mice (P < 0.05). Taken together, these results provide evidence that ACE is associated with body weight and peri-epididymal fat accumulation. This response may involve the generation of oligopeptides that inhibit the activity of EP24.16 and other oligopeptidases within the adipose tissue.
Collapse
Affiliation(s)
- A S Heimann
- Heart Institute (InCor) and Department of Medicine-LIM13, University of São Paulo Medical School, São Paulo, Brazil
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Gozzo FC, Eberlin MN. Primary and secondary kinetic isotope effects in proton (H(+)/D(+)) and chloronium ion ((35)Cl(+)/(37)Cl(+)) affinities. J Mass Spectrom 2001; 36:1140-1148. [PMID: 11747108 DOI: 10.1002/jms.219] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The Cooks' kinetic method and tandem-in-space pentaquadrupole QqQqQ mass spectrometry were used to measure primary and secondary kinetic isotope effects (KIEs) in H(+) and Cl(+) (X(+)) affinity for a series of A/A(') isotopomeric pairs. Gaseous, isotopomeric, and loosely bound dimers [A...X(+)...A(')] were formed in combinations in which X = H(+), D(+), (35)Cl(+) or (37)Cl(+) and A/A(') = acetonitrile/acetonitrile - d(3), acetonitrile/acetonitrile-(15)N, acetonitrile-d(3)/acetonitrile-(15)N, acetone/acetone-d(6), acetone/acetone-(18)O, acetone-d(6)/acetone-(18)O, pyridine/pyridine-d(5), pyridine/pyridine-(15)N, pyridine-d(5)/pyridine-(15)N, or 3-((35)Cl)chloropyridine/3-((37)Cl)chloropyridine. Under nearly the same experimental conditions, the dimers were mass-selected and then dissociated by low-energy collisions with argon, yielding AX(+) and A(')X(+) as the fragment ions. KIEs were measured from the changes in ion affinities of the neutrals (DeltaX(+)) as estimated by the AX(+)/A(')X(+) abundance ratios. Using [A...H(+)(D(+))...A(')] and [A...(35)Cl(+)((37)Cl(+))...A(')] dimers and by comparing their extent of dissociation under nearly identical collision-induced dissociation conditions, the kinetic method was also applied, for the first time, to measure primary KIEs of the central ion as well as their influence on secondary KIEs. Becke3LYP/6-311++G(2df,2p) calculations were found to provide Delta(DeltaZPE)s for the competitive dissociation reactions that accurately predict the nature (normal or inverse) of the measured KIEs.
Collapse
Affiliation(s)
- F C Gozzo
- Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970 Campinas, SP, Brazil
| | | |
Collapse
|
25
|
Koch KJ, Gozzo FC, Zhang D, Eberlin MN, Cooks RG. Serine octamer metaclusters: formation, structure elucidation and implications for homochiral polymerization. Chem Commun (Camb) 2001:1854-5. [PMID: 12240347 DOI: 10.1039/b107148n] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multiply charged serine metaclusters (composed of two or more homochiral octameric units) are generated by electrospray ionization, and their unique fused structures (hydrogen-bonded through the sticky ends of the drum-shaped octameric units) have been elucidated using tandem mass spectrometry experiments and molecular mechanics calculations.
Collapse
Affiliation(s)
- K J Koch
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | | | | | | | | |
Collapse
|
26
|
Abstract
Serine undergoes chiroselective self-directed oligomerization to form a singly protonated octamer under positive ion electrospray conditions, as identified by ion trap tandem mass spectrometry. The experiments also show a series of higher-order clusters (metaclusters) corresponding to [(Ser8H)n]n+, n = 1, 2, 3. There is a magic number effect favoring formation of the protonated octamer over its homologues and also a strong preference for octamer formation from homochiral serine molecules. Collision-induced dissociation suggests that the protonated octamer is composed of four hydrogen-bonded dimers, stabilized by further extensive hydrogen bonding. Density functional calculations support this model and show that the protonated homochiral octamer is energetically stabilized relative to its possible fragments (dimer plus protonated hexamer, etc). The calculations also show that heterochiral octamers are less stable than homochiral octamers (e.g., the protonated 7:1 cluster is 2.1 kcal/mol less stable than the 8:0 analogue). The implications of these results for the origin of homochirality are discussed.
Collapse
Affiliation(s)
- R G Cooks
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
| | | | | | | | | |
Collapse
|
27
|
Abstract
A novel mass spectrometric method for rapid, accurate (2-4% ee) quantitation of chiral drugs is described. Copper(II)-bound complexes of seven model drugs (atenolol, DOPA, ephedrine, pseudoephedrine, isoproterenol, norepinephrine, propranolol) with chiral reference compounds (L-amino acids) are generated by electrospray ionization mass spectrometry. The trimeric complex ions (three chiral ligands--one of the analyte and two of the reference compound) are collisionally activated, and they undergo dissociation by competitive loss of either the neutral reference or the neutral drug molecule. The ratio of the two competitive dissociation rates, viz. the product ion branching ratio, is related via the kinetic method to the enantiomeric composition of the drug mixture. A two-point calibration curve, derived from the kinetic method, allows rapid quantitation of enantiomeric excess of drug mixtures. The chiral sensitivity of the method is such as to allow determination of mixtures with a few percent enantiomeric contamination.
Collapse
Affiliation(s)
- W A Tao
- Aston Laboratory for Mass Spectrometry, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
| | | | | |
Collapse
|
28
|
Gozzo F, Poupaert JH. Xenoestrogens, pollution & health: a critical review. J Pharm Belg 1998; 53:278-86. [PMID: 9766095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
This review article provides basic information concerning the xenoestrogens (i.e. the sexual hormone mimetic or disruptive compounds) in a perspective willingly selective of the recent literature. In the second part, a hypothetical link between xenoestrogens and disturbances of the central nervous system is considered with respect to steroids more directly involved in the CNS, i.e. the neurosteroids. The data accumulated so far on xenoestrogens present in the environment and their possible competition for membrane-bound neurosteroid receptor sites lend support to the working hypothesis that human behaviour could be affected in the daily life by exposure to chemical pollutants.
Collapse
Affiliation(s)
- F Gozzo
- Dipartimento di Scienze Moleculari Agroalimentari (DISMA), Facoltà di Agraria, Università Cattolica di Milano, Italia
| | | |
Collapse
|
29
|
Lamb DC, Kelly DE, Baldwin BC, Gozzo F, Boscott P, Richards WG, Kelly SL. Differential inhibition of Candida albicans CYP51 with azole antifungal stereoisomers. FEMS Microbiol Lett 1997; 149:25-30. [PMID: 9103974 DOI: 10.1111/j.1574-6968.1997.tb10303.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Azole antifungal compounds are important in agriculture and in the treatment of mycotic infection. The target enzyme, sterol 14 alpha-demethylase (CYP51), is inhibited through binding of triazole N-4 to the haem of this P450, as a sixth ligand together with the N-1 substituent groups interacting in some way with the apoprotein. Here we use Saccharomyces cerevisiae expression systems for the target enzyme of Candida albicans to investigate binding of enantiomers of the azole antifungal compounds SCH39304 and tetraconazole. A molecular model produced previously provided qualitative explanations for these differences. Interaction of the azole antifungal aromatic group with Phe-233 or -235 may cause the higher activity for (R)-tetraconazole while inactivity of the (SS)-enantiomer of SCH39304 was predicted to result from incompatibility of the hydrophilic sulfonyl moiety when located into the hydrophobic pocket of the active site.
Collapse
Affiliation(s)
- D C Lamb
- Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, University of Sheffield, UK
| | | | | | | | | | | | | |
Collapse
|
30
|
Sorrilha AE, Gozzo FC, Pimpim RS, Eberlincor MN. Multiple stage pentaquadrupole mass spectrometry for generation and characterization of gas-phase ionic species. The case of the PyC2H 5 (+·) isomers. J Am Soc Mass Spectrom 1996; 7:1126-1137. [PMID: 24203075 DOI: 10.1016/s1044-0305(96)00074-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/1996] [Revised: 06/26/1996] [Accepted: 06/27/1996] [Indexed: 06/02/2023]
Abstract
Eleven isomers with the PyC2H 5 (+·) composition, which include three conventional (1-3) and eight distonic radical cations (4-11), have been generated and in most cases successfully characterized in the gas phase via tandem-in-space multiple-stage pentaquadrupole MS(2) and MS(3) experiments. The three conventional radical cations, that is, the ionized ethylpyridines C2H5-C5H4N(+·) (1-3), were generated via direct 70-eV electron ionization of the neutrals, whereas sequences of chemical ionization and collision-induced dissociation (CID) or mass-selected ion-molecule reactions were used to generate the distonic ions H2C(·)-C5H4N(+)-CH3 (4-6), CH3-C5H4N(+)-CH 2 (·) (7-9), C5H5N(+)-CH2CH 2 (·) (10), and C5H5N(+)-CH(·)-CH3 (11). Unique features of the low-energy (15-eV) CID and ion-molecule reaction chemistry with the diradical oxygen molecule of the isomers were used for their structural characterization. All the ion-molecule reaction products of a mass-selected ion, each associated with its corresponding CID fragments, were collected in a single three-dimensional mass spectrum. Ab initio calculations at the ROMP2/6-31G(d, p)//6-31G(d, p)+ZPE level of theory were performed to estimate the energetics involved in interconversions within the PyC2H5 (+·) system, which provided theoretical support for facile 4⇌7 interconversion evidenced in both CID and ion-molecule reaction experiments. The ab initio spin densities for the a-distonic ions 4-9 and 11 were found to be largely on the methylene or methyne formal radical sites, which thus ruled out substantial odd-spin derealization throughout the neighboring pyridine ring. However, only 8 and 9 (and 10) react extensively with oxygen by radical coupling, hence high spin densities on the radical site of the distonic ions do not necessarily lead to radical coupling reaction with oxygen. The very typical "spatially separated" ab initio charge and spin densities of 4-11 were used to classify them as distonic ions, whereas 1-3 show, as expected, "localized" electronic structures characteristic of conventional radical ions.
Collapse
Affiliation(s)
- A E Sorrilha
- Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970, Campinas, SP, Brazil
| | | | | | | |
Collapse
|
31
|
|
32
|
Gozzo FC, Eberlin MN. The ionized methylene transfer from the distonic radical cation (+)CH 2-O-CH 2 to heterocyclic compounds. A pentaquadrupole mass spectrometric study. J Am Soc Mass Spectrom 1995; 6:554-563. [PMID: 24214352 DOI: 10.1016/1044-0305(95)00246-a] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/1994] [Revised: 03/14/1995] [Accepted: 03/21/1995] [Indexed: 06/02/2023]
Abstract
Ion-molecule reactions of the mass-selected distonic radical cation (+)CH2-O-CH 2 (·) (1) with several heterocyclic compounds have been investigated by multiple stage mass spectro- metric experiments performed in a pentaquadrupole mass spectrometer. Reactions with pyridine, 2-, 3-, and 4-ethyl, 2-methoxy, and 2-n-propyl pyridine occur mainly by transfer of CH 2 (+·) to the nitrogen, which yields distonic N-methylene-pyridinium radical cations. The MS(3) spectra of these products display very characteristic collision-induced dissociation chemistry, which is greatly affected by the position of the substituent in the pyridine ring. Ortho isomers undergo a δ-cleavage cyclization process induced by the free-radical character of the N-methylene group that yields bicyclic pyridinium cations. On the other hand, extensive CH 2 (+·) transfer followed by rapid hydrogen atom loss, that is, a net CH(+) transfer, occurs not to the heteroatoms, but to the aromatic ring of furan, thiophene, pyrrole, and N-methyl pyrrole. The reaction proceeds through five- to six-membered ring expansion, which yields the pyrilium, thiapyrilium, N-protonated, and N-methylated pyridine cations, respectively, as indicated by MS(3) scans. Ion 1 fails to transfer CH 2 (+·) to tetrahydrofuran, whereas a new α-distonic sulfur ion is formed in reactions with tetrahydrothiophene. Unstable N-methylene distonic ions, likely formed by transfer of CH 2 (+·) to the nitrogen of piperidine and pyrrolidine, undergo rapid fragmentation by loss of the α-NH hydrogen to yield closed-shell immonium cations. The most thermodynamically favorable products are formed in these reactions, as estimated by ab initio calculations at the MP2/6-31G(d,p)//6-31G(d,p) + ZPE level of theory.
Collapse
Affiliation(s)
- F C Gozzo
- Institute of Chemistry, State University of Campinas, UNICAMP, CP 6154, 13081-970, Campinas, SP, Brazil
| | | |
Collapse
|
33
|
Gozzo F, Berger H, Collins IR, Margaritondo G, Ng W, Ray-Chaudhuri AK, Liang S, Singh S, Cerrina F. Microscopic-scale lateral inhomogeneities of the GaSe-Ge heterojunction energy lineup. Phys Rev B Condens Matter 1995; 51:5024-5027. [PMID: 9979374 DOI: 10.1103/physrevb.51.5024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
34
|
Stasio GD, Dell'orto T, Gozzo F, Alfe D, Bertolo M, Fontana S, Ciotti MT, Mercanti D, Coluzza C, Perfetti P, Margaritondo G. Imaging photoelectron spectromicroscopy: Biological and materials science applications. ACTA ACUST UNITED AC 1994. [DOI: 10.1080/08940889408261295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
35
|
Sanjinés R, Rosenfeld D, Gozzo F, Alméras P, Perez L, Lévy F, Margaritondo G, Schreiner WH. ESCA investigation of SnOx films used as gas sensors. SURF INTERFACE ANAL 1994. [DOI: 10.1002/sia.740220181] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
36
|
Gozzo F, Marsi M, Berger H, Margaritondo G, Ottolenghi A, Ray-Chaudhuri AK, Ng W, Liang S, Singh S, Welnak JT, Wallace JP, Capasso C, Cerrina F. Erratum: Microscopic-scale lateral inhomogeneities of the Schottky-barrier-formation process. Phys Rev B Condens Matter 1994; 49:14085. [PMID: 10021609 DOI: 10.1103/physrevb.49.14085.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
37
|
Gozzo F, Marsi M, Berger H, Margaritondo G, Ottolenghi A, Ray-Chaudhuri AK, Ng W, Liang S, Singh S, Welnak JT, Wallace JP, Capasso C, Cerrina F. Microscopic-scale lateral inhomogeneities of the Schottky-barrier-formation process. Phys Rev B Condens Matter 1993; 48:17163-17167. [PMID: 10008322 DOI: 10.1103/physrevb.48.17163] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
38
|
Perfetti P, Ng W, Ray-Chaudhuri AK, Liang SH, Singh S, Cole RK, Guo ZY, Wallace J, Capasso C, Cerrina F, Mercanti D, Ciotti MT, Gozzo F, Margaritondo G. Scanning photoemission spectromicroscopy of neurons. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1993; 48:1478-1482. [PMID: 9960737 DOI: 10.1103/physreve.48.1478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
39
|
Hwu Y, Lozzi L, Onellion M, Alméras P, Gozzo F, Lévy F, Berger H, Margaritondo G. Reply to "Lifetime broadening in bulk photoemission spectroscopy". Phys Rev B Condens Matter 1993; 48:624-625. [PMID: 10006825 DOI: 10.1103/physrevb.48.624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
40
|
Margaritondo G, Gozzo F, Coluzza C. Band bending at semiconductor interfaces and its effect on photoemission line shapes. Phys Rev B Condens Matter 1993; 47:9907-9909. [PMID: 10005069 DOI: 10.1103/physrevb.47.9907] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
41
|
Marsi M, Houdré R, Rudra A, Ilegems M, Gozzo F, Coluzza C, Margaritondo G. Artificial band discontinuities at GaAs homojunctions. Phys Rev B Condens Matter 1993; 47:6455-6459. [PMID: 10004612 DOI: 10.1103/physrevb.47.6455] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
42
|
Coluzza C, Berger H, Alméras P, Gozzo F, Margaritondo G, Indlekofer G, Forro L, Hwu Y. High-resolution tests of low-dimensionality effects in photoemission. Phys Rev B Condens Matter 1993; 47:6625-6629. [PMID: 10004632 DOI: 10.1103/physrevb.47.6625] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
43
|
Ortega J, García-Vidal FJ, Pérez R, Rincón R, Flores F, Coluzza C, Gozzo F, Margaritondo G, Hwu Y, Lozzi L. Early stages of Schottky-barrier formation for Al deposited on GaAs(110). Phys Rev B Condens Matter 1992; 46:10277-10283. [PMID: 10002872 DOI: 10.1103/physrevb.46.10277] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
44
|
Hwu Y, Lozzi L, Onellion M, Almeras P, Gozzo F, Lévy F, Berger H, Margaritondo G. Photoemission broadening of Fermi-liquid systems, and its relevance to high-temperature superconductors. Phys Rev B Condens Matter 1992; 45:5438-5442. [PMID: 10000260 DOI: 10.1103/physrevb.45.5438] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
45
|
Hwu Y, Lozzi L, Marsi M, Winokur M, Davis P, Onellion M, Berger H, Gozzo F, Lévy F, Margaritondo G. Electronic spectrum of the high-temperature superconducting state. Phys Rev Lett 1991; 67:2573-2576. [PMID: 10044460 DOI: 10.1103/physrevlett.67.2573] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
46
|
|
47
|
|
48
|
|
49
|
|
50
|
|