1
|
Burden TJ, Fernandez KPR, Kagoro M, Eastwood JB, Tanner TFN, Whitwood AC, Clark IP, Towrie M, Krieger J, Lynam JM, Fairlamb IJS. Coumarin C-H Functionalization by Mn(I) Carbonyls: Mechanistic Insight by Ultra-Fast IR Spectroscopic Analysis. Chemistry 2023; 29:e202203038. [PMID: 36625067 PMCID: PMC10947090 DOI: 10.1002/chem.202203038] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 01/11/2023]
Abstract
Mn(I) C-H functionalization of coumarins provides a versatile and practical method for the rapid assembly of fused polycyclic pyridinium-containing coumarins in a regioselective manner. The synthetic strategy enables application of bench-stable organomanganese reagents in both photochemical- and thermal-promoted reactions. The cyclomanganated intermediates, and global reaction system, provide an ideal testing ground for structural characterization of the active Mn(I) carbonyl-containing species, including transient species observable by ultra-fast time-resolved spectroscopic methods. The thermodynamic reductive elimination product, solely encountered from reaction between alkynes and air-stable organometallic cyclomanganated coumarins, has enabled characterization of a critical seven-membered Mn(I) intermediate, detected by time-resolved infrared spectroscopy, enabling the elucidation of the temporal profile of key steps in the reductive elimination pathway. Quantitative data are provided. Manganated polycyclic products are readily decomplexed by AgBF4 , opening-up an efficient route to the formation of π-extended hybrid coumarin-pyridinium compounds.
Collapse
Affiliation(s)
- Thomas J. Burden
- Department of ChemistryUniversity of York HeslingtonYorkYO10 5DDUK
| | | | - Mary Kagoro
- Department of ChemistryUniversity of York HeslingtonYorkYO10 5DDUK
| | | | | | | | - Ian P. Clark
- Central Laser FacilityResearch Complex at Harwell STFC Rutherford Appleton Laboratory Harwell Campus DidcotOxfordshireOX11 0QXUK
| | - Michael Towrie
- Central Laser FacilityResearch Complex at Harwell STFC Rutherford Appleton Laboratory Harwell Campus DidcotOxfordshireOX11 0QXUK
| | | | - Jason M. Lynam
- Department of ChemistryUniversity of York HeslingtonYorkYO10 5DDUK
| | | |
Collapse
|
2
|
Sorzano COS, Vilas JL, Ramírez-Aportela E, Krieger J, Del Hoyo D, Herreros D, Fernandez-Giménez E, Marchán D, Macías JR, Sánchez I, Del Caño L, Fonseca-Reyna Y, Conesa P, García-Mena A, Burguet J, García Condado J, Méndez García J, Martínez M, Muñoz-Barrutia A, Marabini R, Vargas J, Carazo JM. Image processing tools for the validation of CryoEM maps. Faraday Discuss 2022; 240:210-227. [PMID: 35861059 DOI: 10.1039/d2fd00059h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The number of maps deposited in public databases (Electron Microscopy Data Bank, EMDB) determined by cryo-electron microscopy has quickly grown in recent years. With this rapid growth, it is critical to guarantee their quality. So far, map validation has primarily focused on the agreement between maps and models. From the image processing perspective, the validation has been mostly restricted to using two half-maps and the measurement of their internal consistency. In this article, we suggest that map validation can be taken much further from the point of view of image processing if 2D classes, particles, angles, coordinates, defoci, and micrographs are also provided. We present a progressive validation scheme that qualifies a result validation status from 0 to 5 and offers three optional qualifiers (A, W, and O) that can be added. The simplest validation state is 0, while the most complete would be 5AWO. This scheme has been implemented in a website https://biocomp.cnb.csic.es/EMValidationService/ to which reconstructed maps and their ESI can be uploaded.
Collapse
Affiliation(s)
- C O S Sorzano
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - J L Vilas
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | | | - J Krieger
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - D Del Hoyo
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - D Herreros
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | | | - D Marchán
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - J R Macías
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - I Sánchez
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - L Del Caño
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - Y Fonseca-Reyna
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - P Conesa
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - A García-Mena
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - J Burguet
- Depto. de Óptica, Univ. Complutense de Madrid, Pl. Ciencias, 1, 28040, Madrid, Spain
| | - J García Condado
- Biocruces Bizkaia Instituto Investigación Sanitaria, Cruces Plaza, 48903, Barakaldo, Bizkaia, Spain
| | | | - M Martínez
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| | - A Muñoz-Barrutia
- Univ. Carlos III de Madrid, Avda. de la Universidad 30, 28911, Leganés, Madrid, Spain
| | - R Marabini
- Escuela Politécnica Superior, Univ. Autónoma de Madrid, CSIC, C. Francisco Tomás y Valiente, 11, 28049, Madrid, Spain
| | - J Vargas
- Depto. de Óptica, Univ. Complutense de Madrid, Pl. Ciencias, 1, 28040, Madrid, Spain
| | - J M Carazo
- Natl. Center of Biotechnology, CSIC, c/Darwin, 3, 28049, Madrid, Spain.
| |
Collapse
|
3
|
Krieger J, Herreros D, Sorzano C, Carazo J. New tools and pipelines for continuous heterogeneity analysis from cryo-EM using normal modes and 3D Zernike polynomials. Acta Cryst Sect A 2022. [DOI: 10.1107/s2053273322096498] [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: 03/19/2023]
|
4
|
Sorzano COS, Jiménez-Moreno A, Maluenda D, Martínez M, Ramírez-Aportela E, Krieger J, Melero R, Cuervo A, Conesa J, Filipovic J, Conesa P, del Caño L, Fonseca YC, Jiménez-de la Morena J, Losana P, Sánchez-García R, Strelak D, Fernández-Giménez E, de Isidro-Gómez FP, Herreros D, Vilas JL, Marabini R, Carazo JM. On bias, variance, overfitting, gold standard and consensus in single-particle analysis by cryo-electron microscopy. Acta Crystallogr D Struct Biol 2022; 78:410-423. [PMID: 35362465 PMCID: PMC8972802 DOI: 10.1107/s2059798322001978] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 02/18/2022] [Indexed: 12/05/2022] Open
Abstract
Single-particle analysis (SPA) by cryo-electron microscopy comprises the estimation of many parameters along its image-processing pipeline. Overfitting observed in SPA is normally due to misestimated parameters, and the only way to identify these is by comparing the estimates of multiple algorithms or, at least, multiple executions of the same algorithm. Cryo-electron microscopy (cryoEM) has become a well established technique to elucidate the 3D structures of biological macromolecules. Projection images from thousands of macromolecules that are assumed to be structurally identical are combined into a single 3D map representing the Coulomb potential of the macromolecule under study. This article discusses possible caveats along the image-processing path and how to avoid them to obtain a reliable 3D structure. Some of these problems are very well known in the community. These may be referred to as sample-related (such as specimen denaturation at interfaces or non-uniform projection geometry leading to underrepresented projection directions). The rest are related to the algorithms used. While some have been discussed in depth in the literature, such as the use of an incorrect initial volume, others have received much less attention. However, they are fundamental in any data-analysis approach. Chiefly among them, instabilities in estimating many of the key parameters that are required for a correct 3D reconstruction that occur all along the processing workflow are referred to, which may significantly affect the reliability of the whole process. In the field, the term overfitting has been coined to refer to some particular kinds of artifacts. It is argued that overfitting is a statistical bias in key parameter-estimation steps in the 3D reconstruction process, including intrinsic algorithmic bias. It is also shown that common tools (Fourier shell correlation) and strategies (gold standard) that are normally used to detect or prevent overfitting do not fully protect against it. Alternatively, it is proposed that detecting the bias that leads to overfitting is much easier when addressed at the level of parameter estimation, rather than detecting it once the particle images have been combined into a 3D map. Comparing the results from multiple algorithms (or at least, independent executions of the same algorithm) can detect parameter bias. These multiple executions could then be averaged to give a lower variance estimate of the underlying parameters.
Collapse
|
5
|
Harzsch S, Krieger J. Genealogical relationships of mushroom bodies, hemiellipsoid bodies, and their afferent pathways in the brains of Pancrustacea: Recent progress and open questions. Arthropod Struct Dev 2021; 65:101100. [PMID: 34488068 DOI: 10.1016/j.asd.2021.101100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/02/2021] [Accepted: 08/09/2021] [Indexed: 06/13/2023]
Abstract
According to all latest phylogenetic analyses, the taxon Pancrustacea embraces the crustaceans in the traditional sense and the hexapods. Members of the Pancrustacea for a long time have been known to display distinct similarities in the architecture of their brains. Here, we review recent progress and open questions concerning structural and functional communalities of selected higher integrative neuropils in the lateral protocerebrum of pancrustaceans, the mushroom bodies and hemiellipsoid bodies. We also discuss the projection neuron pathway which provides a distinct input channel to both mushroom and hemiellipsoid bodies from the primary chemosensory centers in the deutocerebrum. Neuronal characters are mapped on a current pancrustacean phylogeny in order to extract those characters that are part of the pancrustacean ground pattern. Furthermore, we summarize recent insights into the evolutionary transformation of mushroom body morphology across the Pancrustacea.
Collapse
Affiliation(s)
- S Harzsch
- University of Greifswald, Zoological Institute and Museum, Department of Cytology and Evolutionary Biology, Soldmannstrasse 23, D-17498 Greifswald, Germany.
| | - J Krieger
- University of Greifswald, Zoological Institute and Museum, Department of Cytology and Evolutionary Biology, Soldmannstrasse 23, D-17498 Greifswald, Germany
| |
Collapse
|
6
|
Rößner-Ruff V, Führmann F, Friedrich K, Krieger J, Hauser C, Altunoz U, Ziegenbein M, Graef-Calliess IT. „Geschlechterspezifische“ Unterschiede bei depressiven Erkrankungen? Untersuchung von „nicht-typischen“ Symptomen und Einflussfaktoren - Ergebnisse der „Male Depression“-Studie. Das Gesundheitswesen 2021. [DOI: 10.1055/s-0041-1732749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- V Rößner-Ruff
- TK Frauen, Klinikum Wahrendorff
- Forschung & Entwicklung, Klinikum Wahrendorff
| | - F Führmann
- Allgemeinpsychiatrie, KRH Psychiatrie Wunstorf
| | - K Friedrich
- Forschung & Entwicklung, Klinikum Wahrendorff
| | - J Krieger
- Forschung & Entwicklung, TK Männer, Klinikum Wahrendorff
| | - C Hauser
- Forschung & Entwicklung, Klinikum Wahrendorff
| | - U Altunoz
- Allgemeinpsychiatrie, KRH Psychiatrie Wunstorf
| | - M Ziegenbein
- Forschung & Entwicklung, Klinikum Wahrendorff
- Allgemeinpsychiatrie, Klinikum Wahrendorff
| | | |
Collapse
|
7
|
Krieger J, Nießing B, Snowball S, Luyten F, Papantoniou I, Schmitt R. “Jointpromise”: concept of a multi-step, automated platform for precision manufacturing of joint implants. Cytotherapy 2021. [DOI: 10.1016/s1465324921002929] [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: 10/21/2022]
|
8
|
Krieger J, Kristensen E, Marquardsen M, Ofer S, Giraldi A. 006 A Randomized Controlled Pilot Study of Mindfulness for Sex and Intimacy in Relationships (MSIR) in the Treatment of Sexual Dysfunctions. J Sex Med 2019. [DOI: 10.1016/j.jsxm.2019.03.463] [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: 10/26/2022]
|
9
|
Pregitzer P, Zielonka M, Eichhorn A, Jiang X, Krieger J, Breer H. Expression of odorant-binding proteins in mouthpart palps of the desert locust Schistocerca gregaria. Insect Mol Biol 2019; 28:264-276. [PMID: 30375079 PMCID: PMC7380039 DOI: 10.1111/imb.12548] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Odorant-binding proteins (OBPs) are essential molecular elements of the insect chemosensory system, which is composed of the antennae and the mouthpart palps (maxillary and labial). In this study, we have analysed the expression and the sensilla specificity of 14 OBP subtypes in the palps of the desert locust Schistocerca gregaria. The locust palps comprise only a low number of sensilla basiconica but a high number of sensilla chaetica. Employing a variety of approaches, we found that only a subset of the antennal OBP repertoire was expressed in both palp types. These OBPs were previously shown to be expressed either in sensilla basiconica or sensilla chaetica of the antennae. Comparing the expression pattern in the two chemosensory organs revealed similarities and differences; most remarkably, two OBP subtypes, OBP6 and OBP8, were found in both sensilla types on palps, whereas on the antennae they were solely expressed in one sensillum type. Together, the data indicate a differential, but partly overlapping, expression of OBPs in the two sensilla types of the palps. The differences in the expression pattern of OBP subtypes between antennae and palps might be indicative for distinct functions of the OBPs in the two chemosensory organs.
Collapse
Affiliation(s)
- P. Pregitzer
- Institute of PhysiologyUniversity of HohenheimStuttgartGermany
| | - M. Zielonka
- Institute of PhysiologyUniversity of HohenheimStuttgartGermany
| | - A.‐S. Eichhorn
- Institute of PhysiologyUniversity of HohenheimStuttgartGermany
| | - X. Jiang
- Institute of PhysiologyUniversity of HohenheimStuttgartGermany
| | - J. Krieger
- Institute of Biology/Zoology, Department of Animal PhysiologyMartin Luther University Halle‐WittenbergHalle (Saale)Germany
| | - H. Breer
- Institute of PhysiologyUniversity of HohenheimStuttgartGermany
| |
Collapse
|
10
|
Sorzano COS, Jiménez A, Mota J, Vilas JL, Maluenda D, Martínez M, Ramírez-Aportela E, Majtner T, Segura J, Sánchez-García R, Rancel Y, del Caño L, Conesa P, Melero R, Jonic S, Vargas J, Cazals F, Freyberg Z, Krieger J, Bahar I, Marabini R, Carazo JM. Survey of the analysis of continuous conformational variability of biological macromolecules by electron microscopy. Acta Crystallogr F Struct Biol Commun 2019; 75:19-32. [PMID: 30605122 PMCID: PMC6317454 DOI: 10.1107/s2053230x18015108] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [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: 05/30/2018] [Accepted: 10/26/2018] [Indexed: 11/10/2022] Open
Abstract
Single-particle analysis by electron microscopy is a well established technique for analyzing the three-dimensional structures of biological macromolecules. Besides its ability to produce high-resolution structures, it also provides insights into the dynamic behavior of the structures by elucidating their conformational variability. Here, the different image-processing methods currently available to study continuous conformational changes are reviewed.
Collapse
Affiliation(s)
| | - A. Jiménez
- National Center of Biotechnology (CSIC), Spain
| | - J. Mota
- National Center of Biotechnology (CSIC), Spain
| | - J. L. Vilas
- National Center of Biotechnology (CSIC), Spain
| | - D. Maluenda
- National Center of Biotechnology (CSIC), Spain
| | - M. Martínez
- National Center of Biotechnology (CSIC), Spain
| | | | - T. Majtner
- National Center of Biotechnology (CSIC), Spain
| | - J. Segura
- National Center of Biotechnology (CSIC), Spain
| | | | - Y. Rancel
- National Center of Biotechnology (CSIC), Spain
| | - L. del Caño
- National Center of Biotechnology (CSIC), Spain
| | - P. Conesa
- National Center of Biotechnology (CSIC), Spain
| | - R. Melero
- National Center of Biotechnology (CSIC), Spain
| | - S. Jonic
- Sorbonne Université, UMR CNRS 7590, Muséum National d’Histoire Naturelle, IRD, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, Paris, France
| | | | - F. Cazals
- Inria Sophia Antipolis – Méditerranée, France
| | | | | | | | | | | |
Collapse
|
11
|
Kaufman S, Krieger J, Langhans W, Arnold M. Lipids as potential contributors to the beneficial effects of Roux‐en‐Y gastric bypass surgery (RYGB). FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.lb385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
12
|
Krieger J, Yesinovskiy A, Mozdziak P, Kim MH. Developing Scalable Production Methods for Cultured Pork and Turkey Meat: Beyond the Petri Dish. Meat and Muscle Biology 2018. [DOI: 10.22175/rmc2018.015] [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: 11/03/2022] Open
|
13
|
Rößner-Ruff V, Krieger J, Graef-Calliess I. Male depression – actual a male specific disorder or potentially a new subtype of depression? Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.02.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
IntroductionAlthough depression is one of the most prevalent disorders around the world we know only little about the effect of factors like gender-related norms or personality-related aspects in the expression of depressive symptoms. Current findings of studies are heterogeneous and lead to the conclusion that depression is more prevalent in women as well as that they have a higher risk for depression. Women express more typical depressive symptoms while men offer more atypical symptoms like aggressiveness, irritability, alcohol misuse which is constituted as male depression (MD).ObjectiveMale and female patients with a diagnosis of depressive episode or recurrent depressive disorder (ICD-10) who are treated in in-patient or day clinic setting of two psychiatric institutions in Lower Saxony and one psychiatric university hospital in Austria. Study period: November 2016 to November 2017. No limitations to further diagnosis, age or other factors.MethodsTo analyze the expression of (a) typical depressive symptoms as well as causes of and factors of influence in diverse types of depression different questionnaires and quantitative methods will be used.AimsInvestigate gender-specific differences in the expression of symptoms in male and female patients with a depressive disorder. Focus: whether symptoms of MD are more prevalent for depressive men than women. Furthermore, causes and factors of (a)typical depressive symptoms should be analyzed.ResultsFirst results will be presented.ConclusionThe results of the study should lead to the conclusion whether there exist any gender-specific differences in the expression of depressive symptoms and what they might be caused by.Disclosure of interestThe authors have not supplied their declaration of competing interest.
Collapse
|
14
|
Krieger J, Nelson R, Vandas E, Subramanian H, Pan H, Warrier M. P122 State-wide legislation positively impacts attendance for students with asthma. Ann Allergy Asthma Immunol 2016. [DOI: 10.1016/j.anai.2016.09.132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
15
|
Zielonka M, Gehrke P, Badeke E, Sachse S, Breer H, Krieger J. Larval sensilla of the moth Heliothis virescens respond to sex pheromone components. Insect Mol Biol 2016; 25:666-678. [PMID: 27465144 DOI: 10.1111/imb.12253] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Female-released sex pheromones orchestrate the mating behaviour of moths. Recent studies have shown that sex pheromones not only attract adult males but also caterpillars. Single sensillum recordings revealed that larval antennal sensilla of the moth Heliothis virescens respond to specific sex pheromone components. In search for the molecular basis of pheromone detection in larvae, we found that olfactory sensilla on the larval antennae are equipped with the same molecular elements that mediate sex pheromone detection in adult male moths, including the Heliothis virescens receptors 6 (HR6) and HR13, as well as sensory neurone membrane protein 1 (SNMP1). Thirty-eight olfactory sensory neurones were identified in three large sensilla basiconica; six of these are considered as candidate pheromone responsive cells based on the expression of SNMP1. The pheromone receptor HR6 was found to be expressed in two cells and the receptor HR13 in three cells. These putative pheromone responsive neurones were accompanied by cells expressing pheromone-binding protein 1 (PBP1) and PBP2. The results indicate that the responsiveness of larval sensilla to female-emitted sex pheromones is based on the same molecular machinery as in the antennae of adult males.
Collapse
Affiliation(s)
- M Zielonka
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - P Gehrke
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - E Badeke
- Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - S Sachse
- Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - H Breer
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - J Krieger
- Department of Animal Physiology, Institute of Biology/Zoology, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| |
Collapse
|
16
|
Schoenfeld B, Contreras B, Ogborn D, Galpin A, Krieger J, Sonmez G. Effects of Varied Versus Constant Loading Zones on Muscular Adaptations in Trained Men. Int J Sports Med 2016; 37:442-7. [DOI: 10.1055/s-0035-1569369] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- B. Schoenfeld
- Department of Health Sciences, CUNY Lehman College, Bronx, United States
| | - B. Contreras
- Sport Performance Research Institute, Aukland University of Technology, Aukland, New Zealand
| | - D. Ogborn
- Health Sciences, McMaster University, W. Hamilton, Canada
| | - A. Galpin
- Neuromuscular and Neurometabolic Unit, Cal State Fullerton, Fullerton, United States
| | - J. Krieger
- Weightology.net, Issaquah, United States
| | - G. Sonmez
- Department of Health Sciences, CUNY Lehman College, Bronx, United States
| |
Collapse
|
17
|
Von Schantz M, Taporoski T, Horimoto A, Esteban N, Vallada H, Krieger J, Pedrazzoli M, Negrão A, Pereira A. Distribution and heritability of diurnal preference (chronotype) in a rural Brazilian family-based cohort, the Baependi study. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.105] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
18
|
Kohler P, Chilongozi D, Namate D, Barr B, Msungama W, Mwale M, Phiri O, Tenthani L, Perdue T, Barnhart S, Krieger J. Quality improvement practices decrease adverse event rates in a surgical
male circumcision program in Malawi. Ann Glob Health 2015. [DOI: 10.1016/j.aogh.2015.02.941] [Citation(s) in RCA: 1] [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: 11/28/2022] Open
|
19
|
Pregitzer P, Greschista M, Breer H, Krieger J. The sensory neurone membrane protein SNMP1 contributes to the sensitivity of a pheromone detection system. Insect Mol Biol 2014; 23:733-742. [PMID: 25047816 DOI: 10.1111/imb.12119] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Male moths detect female-released sex pheromones with extraordinary sensitivity. The remarkable sensory ability is based on a cooperative interplay of pheromone binding proteins in the lymph of hair-like sensilla trichodea and pheromone receptors in the dendrites of sensory neurones. Here we examined whether in Heliothis virescens the so-called 'sensory neurone membrane protein 1' (SNMP1) may contribute to responsiveness to the pheromone component, (Z)-11-hexadecenal (Z11-16:Ald). By means of immunohistochemistry and in situ hybridization we demonstrated that SNMP1 is in fact present in cells expressing the Z11-16:Ald receptor HR13 and the dendrites of sensory neurones. To assess a possible function of SNMP1 we monitored the responsiveness of cell lines that expressed HR13 alone or the combination SNMP1/HR13 to stimulation with Z11-16:Ald by calcium imaging. It was found that SNMP1/HR13 cells were 1000-fold more sensitive to pheromone stimulation compared with HR13 cells. In contrast, cells that expressed HR13 and the non-neuronal SNMP2-type showed no change in pheromone sensitivity. Overall, our reconstitution experiments demonstrate that the presence of SNMP1 significantly increases the HR13-based responsiveness of cells to Z11-16:Ald, suggesting that SNMP1 also contributes to the response of the antennal neurones and thus to the remarkable sensitivity of the pheromone detection system.
Collapse
Affiliation(s)
- P Pregitzer
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | | | | | | |
Collapse
|
20
|
Neubacher H, Krieger J, Zaplatynski P, Lohmann W. ESR Study on Complexes Formed on Reaction of cis-Dichlorodiammineplatinum(II) with Cytosine and Cytidine. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-1982-0623] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The ESR spectra of novel paramagnetic comple-xes between cis-dichlorodiammineplatinum(II) and cytosine or cytidine in aqueous solution are presented and discussed. The results imply a complex containing a binuclear metal-metal bonded platinum moiety with an unpaired electron spin delocalized over the dz2-orbitals.
Collapse
Affiliation(s)
- H. Neubacher
- Institut für Biophysik, Strahlenzentrum, Justus-Liebig-Universität, D-6300 Gießen
| | - J. Krieger
- Institut für Biophysik, Strahlenzentrum, Justus-Liebig-Universität, D-6300 Gießen
| | - P. Zaplatynski
- Institut für Biophysik, Strahlenzentrum, Justus-Liebig-Universität, D-6300 Gießen
| | - W. Lohmann
- Institut für Biophysik, Strahlenzentrum, Justus-Liebig-Universität, D-6300 Gießen
| |
Collapse
|
21
|
Tien W, Chen H, Berwick Z, Krieger J, Chambers S, Dabiri D, Kassab G. Characterization of a Bioprosthetic Bicuspid Venous Valve Hemodynamics and Implications for Mechanism of Valve Dynamics. J Vasc Surg Venous Lymphat Disord 2014; 2:119. [DOI: 10.1016/j.jvsv.2013.10.049] [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: 10/25/2022]
|
22
|
Tien W, Chen H, Berwick Z, Krieger J, Chambers S, Dabiri D, Kassab G. Hemodynamic Role of Sinus on Venous Valve Performance. J Vasc Surg Venous Lymphat Disord 2014; 2:117. [DOI: 10.1016/j.jvsv.2013.10.041] [Citation(s) in RCA: 1] [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: 11/25/2022]
|
23
|
Krieger J, Köhler K, Gräser M, Lüdtke-Buzug K. Construction of a Spectrometer to Measure the Cotton-Mouton Effect of Superparamagnetic Iron Oxide Nanoparticles. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-C/bmt-2013-4102/bmt-2013-4102.xml. [DOI: 10.1515/bmt-2013-4102] [Citation(s) in RCA: 1] [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: 11/15/2022]
|
24
|
Lopez A, Faugeron F, Adrien J, Beck F, Brion A, Gronfier C, Krieger J, Muzet A, Philip P, Vecchierini MF, Paquereau J, Leger D. La somnolence au quotidien. Enquête Institut national du sommeil et de la vigilance. Journée du Sommeil® 2011. Neurophysiol Clin 2012. [DOI: 10.1016/j.neucli.2012.02.061] [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: 10/28/2022] Open
|
25
|
Grenèche J, Krieger J, Bertrand F, Erhardt C, Muzet A, Tassi P. Effect of continuous positive airway pressure treatment on the subsequent EEG spectral power and sleepiness over sustained wakefulness in patients with obstructive sleep apnea-hypopnea syndrome. Clin Neurophysiol 2011; 122:958-65. [PMID: 20889373 DOI: 10.1016/j.clinph.2010.09.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 08/19/2010] [Accepted: 09/06/2010] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To determine whether sleepiness and its evolution over sustained wakefulness could be reversed by nasal continuous positive airway pressure (CPAP) therapy in patients with obstructive sleep apnea-hypopnea syndrome (OSAHS). METHODS Twelve OSAHS patients underwent three 32-h sessions of study: one before CPAP therapy (T0), the second (T3) and the third (T6), respectively, after 3 and 6 months of therapy. Each session included one night of sleep followed by 24 h of sustained wakefulness, during which EEG recordings and subjective ratings were performed every hour. RESULTS The waking EEG in treated OSAHS patients was partially improved after 3 months of CPAP and their subjective complaint of sleepiness was normalized after 6 months. Theta power (3.9-7.8 Hz) was decreased as well as its time course during the diurnal period but beta power (12.7-29.2 Hz) remained higher. CONCLUSIONS CPAP partially reverses waking EEG abnormalities in OSAHS patients with reduced theta activity after 3 months and removes the subjective complaint of sleepiness after 6 months. Nevertheless, the persistence of increased beta activity in treated patients suggests that efforts to stay awake remain strong after CPAP treatment. SIGNIFICANCE CPAP influences the EEG's time course over sustained wakefulness in a frequency-specific manner in OSAHS patients.
Collapse
Affiliation(s)
- J Grenèche
- Laboratoire d'Imagerie et de Neurosciences Cognitives (LINC CNRS), Strasbourg, France.
| | | | | | | | | | | |
Collapse
|
26
|
Harzsch S, Rieger V, Krieger J, Seefluth F, Strausfeld NJ, Hansson BS. Transition from marine to terrestrial ecologies: changes in olfactory and tritocerebral neuropils in land-living isopods. Arthropod Struct Dev 2011; 40:244-257. [PMID: 21641866 DOI: 10.1016/j.asd.2011.03.002] [Citation(s) in RCA: 24] [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] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 02/25/2011] [Accepted: 03/21/2011] [Indexed: 05/30/2023]
Abstract
In addition to the ancestors of insects, representatives of five lineages of crustaceans have colonized land. Whereas insects have evolved sensilla that are specialized to allow the detection of airborne odors and have evolved olfactory sensory neurons that recognize specific airborne ligands, there is so far little evidence for aerial olfaction in terrestrial crustaceans. Here we ask the question whether terrestrial Isopoda have evolved the neuronal substrate for the problem of detecting far-field airborne chemicals. We show that conquest of land of Isopoda has been accompanied by a radical diminution of their first antennae and a concomitant loss of their deutocerebral olfactory lobes and olfactory computational networks. In terrestrial isopods, but not their marine cousins, tritocerebral neuropils serving the second antenna have evolved radical modifications. These include a complete loss of the malacostracan pattern of somatotopic representation, the evolution in some species of amorphous lobes and in others lobes equipped with microglomeruli, and yet in others the evolution of partitioned neuropils that suggest modality-specific segregation of second antenna inputs. Evidence suggests that Isopoda have evolved, and are in the process of evolving, several novel solutions to chemical perception on land and in air.
Collapse
Affiliation(s)
- S Harzsch
- Universität Greifswald, Fachbereich Biologie, Abteilung Cytologie und Evolutionsbiologie, J.-S.-Bach Strasse 11/12, D-17498 Greifswald, Germany.
| | | | | | | | | | | |
Collapse
|
27
|
Greene-Finestone LS, Berger C, de Groh M, Hanley DA, Hidiroglou N, Sarafin K, Poliquin S, Krieger J, Richards JB, Goltzman D. 25-Hydroxyvitamin D in Canadian adults: biological, environmental, and behavioral correlates. Osteoporos Int 2011; 22:1389-99. [PMID: 20730415 PMCID: PMC5102696 DOI: 10.1007/s00198-010-1362-7] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Accepted: 07/13/2010] [Indexed: 12/15/2022]
Abstract
SUMMARY We assessed vitamin D status and its correlates in the population-based Canadian Multicentre Osteoporosis Study (CaMos). Results showed that serum 25-hydroxyvitamin D levels <75 nmol/L were common. Given Canada's high latitude, attention should be given to strategies for enhancing vitamin D status in the population. INTRODUCTION Inadequate vitamin D has been implicated as a risk factor for several clinical disorders. We assessed, in a Canadian cohort, vitamin D status and its correlates, based on serum 25-hydroxyvitamin D [25(OH)D], the best functional indicator of vitamin D status. METHODS We studied 577 men and 1,335 women 35+ years from seven cities across Canada in the randomly selected, population-based Canadian Multicentre Osteoporosis Study (CaMos). Participants completed a comprehensive questionnaire. Serum 25(OH)D was measured by immunoassay. Multivariate linear regression modeling assessed the association between 25(OH)D and determinants of vitamin D status. RESULTS Participants (2.3%) were deficient in 25(OH)D (<27.5 nmol/L); a further 18.1% exhibited 25(OH)D insufficiency (27.5-50 nmol/L). Levels <75 nmol/L were evident in 57.5% of men and 60.7% of women and rose to 73.5% in spring (men) and 77.5% in winter (women); 25(OH)D <50 nmol/L was ≤10% year round for those supplementing with ≥400 IU vitamin D/day but was 43.9% among those not supplementing in winter and spring. The strongest predictors of reduced 25(OH)D for both men and women were winter and spring season, BMI ≥30, non-white ethnicity, and lower vitamin D supplementation and its modification by fall and winter. CONCLUSIONS In this national Canadian cohort, vitamin D levels <75 nmol/L were common, particularly among non-white and obese individuals, and in winter and spring. Vitamin D intake through diet and supplementation and maintenance of normal weight are key modifiable factors for enhancing vitamin D status and thus potentially influencing susceptibility to common chronic diseases.
Collapse
|
28
|
Kovalchin J, Krieger J, Genova M, Collins K, Augustyniak M, Masci A, Hittinger T, Kuca B, Edan G, Braudeau C. Results of a phase I study in patients suffering from secondary-progressive multiple sclerosis demonstrating the safety of the amino acid copolymer PI-2301 and a possible induction of an anti-inflammatory cytokine response☆. J Neuroimmunol 2010; 225:153-63. [DOI: 10.1016/j.jneuroim.2010.04.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Revised: 04/12/2010] [Accepted: 04/14/2010] [Indexed: 11/15/2022]
|
29
|
Song K, Sul C, Cho I, Riley D, Krieger J. UP.25: Do Androgen Receptor Polymorphisms Contribute to an Increased Risk for Benign Prostate Hyperlasia (BPH)? Urology 2008. [DOI: 10.1016/j.urology.2008.08.348] [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: 11/28/2022]
|
30
|
Alonderis A, Barbé F, Bonsignore M, Calverley P, De Backer W, Diefenbach K, Donic V, Fanfulla F, Fietze I, Franklin K, Grote L, Hedner J, Jennum P, Krieger J, Levy P, McNicholas W, Montserrat J, Parati G, Pascu M, Penzel T, Riha R, Rodenstein D, Sanna A, Schulz R, Sforza E, Sliwinski P, Tomori Z, Tonnesen P, Varoneckas G, Zielinski J, Kostelidou K. Medico-legal implications of sleep apnoea syndrome: Driving license regulations in Europe. Sleep Med 2008; 9:362-75. [PMID: 17765641 DOI: 10.1016/j.sleep.2007.05.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2007] [Revised: 05/09/2007] [Accepted: 05/13/2007] [Indexed: 11/30/2022]
Abstract
BACKGROUND Sleep apnoea syndrome (SAS), one of the main medical causes of excessive daytime sleepiness, has been shown to be a risk factor for traffic accidents. Treating SAS results in a normalized rate of traffic accidents. As part of the COST Action B-26, we looked at driving license regulations, and especially at its medical aspects in the European region. METHODS We obtained data from Transport Authorities in 25 countries (Austria, AT; Belgium, BE; Czech Republic, CZ; Denmark, DK; Estonia, EE; Finland, FI; France, FR; Germany, DE; Greece, GR; Hungary, HU; Ireland, IE; Italy, IT; Lithuania, LT; Luxembourg, LU; Malta, MT; Netherlands, NL; Norway, EC; Poland, PL; Portugal, PT; Slovakia, SK; Slovenia, SI; Spain, ES; Sweden, SE; Switzerland, CH; United Kingdom, UK). RESULTS Driving license regulations date from 1997 onwards. Excessive daytime sleepiness is mentioned in nine, whereas sleep apnoea syndrome is mentioned in 10 countries. A patient with untreated sleep apnoea is always considered unfit to drive. To recover the driving capacity, seven countries rely on a physician's medical certificate based on symptom control and compliance with therapy, whereas in two countries it is up to the patient to decide (on his doctor's advice) to drive again. Only FR requires a normalized electroencephalography (EEG)-based Maintenance of Wakefulness Test for professional drivers. Rare conditions (e.g., narcolepsy) are considered a driving safety risk more frequently than sleep apnoea syndrome. CONCLUSION Despite the available scientific evidence, most countries in Europe do not include sleep apnoea syndrome or excessive daytime sleepiness among the specific medical conditions to be considered when judging whether or not a person is fit to drive. A unified European Directive seems desirable.
Collapse
Affiliation(s)
- A Alonderis
- Institute of Psychophysiology and Rehabilitation, Palanga, Lithuania
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Henes JC, Müller M, Krieger J, Balletshofer B, Pfannenberg AC, Kanz L, Kötter I. [18F] FDG-PET/CT as a new and sensitive imaging method for the diagnosis of large vessel vasculitis. Clin Exp Rheumatol 2008; 26:S47-S52. [PMID: 18799053] [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: 05/26/2023]
Abstract
OBJECTIVE To determine the value of the new imaging modality positron-emission tomography/computed tomography (PET/CT) for the diagnosis and re-evaluation of large vessel vasculitis. METHODS Thirteen patients newly diagnosed or re-evaluated for suspected clinical disease activity of Takayasu arteritis (TA, 3 patients) or giant cell arteritis (GCA, 10 patients) underwent PET/CT. Clinical activity status, serological markers, and alternative imaging methods were evaluated. RESULTS In patients with clinical activity despite nearly normal erythrocyte sedimentation rate (ESR) and C reactive protein (CRP), disease activity could be shown by PET-CT. A long segmental, increased fluoro-deoxyglucose (FDG) uptake in the vessel wall served as confirmation of the vascular inflammation. The aortic arch was involved in all patients with active disease (n=12). In the complementary CT scans, stenotic lesions were found in 8 out of 13 patients. Duplex ultrasonography was performed in 11/13 patients and was positive in nine of these patients at least at one site. Magnetic resonance imaging (MRI) was done for confirmation in 10 patients. CONCLUSION Doppler ultrasonography is a very useful and widely available method to confirm a first suspicion of vasculitis, but it has limitations especially at the large thoracic vessels, which are affected in many cases. ESR and CRP alone are not sufficient to evaluate disease activity. The new imaging modality PET/CT provides the additional information. It allows the evaluation of disease activity and vessel morphology as well as the localization of the inflammatory process in the same session.
Collapse
Affiliation(s)
- J C Henes
- Department of Internal Medicine II (Haematology, Oncology, Immunology, Rheumatology, Pulmology), University Hospital Tübingen, Germany
| | | | | | | | | | | | | |
Collapse
|
32
|
|
33
|
Krieger J. [What to do with a sleepy patient treated with CPAP]. Rev Mal Respir 2006; 23 Spec No 2:7S106-7S108. [PMID: 17127892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Affiliation(s)
- J Krieger
- Unité des troubles du sommeil, Clinique neurologique, Hôpital Civil, 1, place de l'Hôpital, 67100 Strasbourg.
| |
Collapse
|
34
|
Krieger J. Conduite à tenir devant un malade somnolent sous PPC. Rev Mal Respir 2006. [DOI: 10.1016/s0761-8425(06)72507-4] [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: 10/22/2022]
|
35
|
Maida R, Mameli M, Müller B, Krieger J, Steinbrecht RA. The expression pattern of four odorant-binding proteins in male and female silk moths, Bombyx mori. ACTA ACUST UNITED AC 2006; 34:149-63. [PMID: 16374716 DOI: 10.1007/s11068-005-5054-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2005] [Revised: 07/08/2005] [Accepted: 07/08/2005] [Indexed: 10/25/2022]
Abstract
Four recombinant odorant-binding proteins of Bombyx mori, pheromone-binding protein (PBP), general odorant-binding protein 1 (GOBP1), general odorant-binding protein 2 (GOBP2) and antennal binding protein X (ABPX), were expressed in E. coli and used to raise polyclonal antisera. Immunoblots of antennal homogenates showed that these antisera were specific. In Western blot analysis and immunocytochemical labelling experiments, the sera against recombinant PBP and GOBP2 of B. mori gave identical results as sera against native PBP and GOBP2 of Antheraea polyphemus, respectively, thus confirming earlier results obtained with the latter. Labelling consecutive cross sections of various sensillum types with all four antisera revealed different labelling patterns in male and female sensilla (s.) trichodea and s. basiconica. Long s. trichodea in males and females represented uniform labelling types, whereas for short s. trichodea, s. intermedia, and s. basiconica a great variety of labelling patterns was observed, some being more common than others. Long s. trichodea, which in males are uniformly tuned to the pheromone components bombykol and bombykal, all strongly expressed PBP; labelling with antisera against the other three odorant-binding proteins hardly was above background, only in some hairs GOBP1 was expressed somewhat more strongly. Long s. trichodea of females, which respond specifically to linalool and benzoic acid, showed a different labelling pattern. Here, we observed strong labelling with antibodies against GOBP2 and medium labelling with anti-GOBP1, sometimes with anti-ABPX. S. basiconica in both sexes most commonly co-expressed GOBP1 and GOBP2, but other patterns were occasionally found, with some of them showing PBP expression, also in females. The great variety of labelling types in short s. trichodea, s. intermedia, and s. basiconica suggests a similar variety of functional subtypes as observed in plant odour-sensitive sensilla of other moth species.
Collapse
Affiliation(s)
- R Maida
- Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, Germany
| | | | | | | | | |
Collapse
|
36
|
Iamandi C, Erhart C, Krieger J. Analyse de causes de somnolence diurne excessive résiduelle sous traitement par PPC. Rev Mal Respir 2006. [DOI: 10.1016/s0761-8425(06)72354-3] [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: 11/28/2022]
|
37
|
Abstract
Abnormalities of REM sleep i.e. absence of atonia and abnormal motor control which are described in patients with REM sleep behavior disorder, have induced clinical and physiopathological interest. Initial hypothesis of a simple dysfunction of REM sleep generators has not been confirmed. The prevalence in older subjects and in patients with parkinsonian syndromes suggest that the appearance of the parasomnia is related to alteration in the neurons of pontine area i.e. nucleus peduncolopontine, in which there is an integration of sleep-wake mechanisms and locomotor systems. Controversy surrounds the specificity of absence of atonia in the diagnosis of the parasomnia. Since this polygraphic finding may be present in subjects without any sleep complaint and in patients with initial neurological impairment, diagnosis of the sleep disorders might be allowed only when the polygraphic characteristic of persistent tonus and complex motor behavior are recorded.
Collapse
Affiliation(s)
- E Sforza
- Sleep Unit, Hopitaux Universitaires de Strasbourg, Strasbourg, France
| | | | | |
Collapse
|
38
|
Krieger J, Grosse-Wilde E, Gohl T, Dewer YME, Raming K, Breer H. Genes encoding candidate pheromone receptors in a moth (Heliothis virescens). Proc Natl Acad Sci U S A 2004; 101:11845-50. [PMID: 15289611 PMCID: PMC511062 DOI: 10.1073/pnas.0403052101] [Citation(s) in RCA: 191] [Impact Index Per Article: 9.6] [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: 11/18/2022] Open
Abstract
The remarkable responsiveness of male moths to female released pheromones is based on the extremely sensitive and selective reaction of highly specialized sensory cells in the male antennae. These cells are supposed to be equipped with male-specific receptors for pheromonal compounds, however, the nature of these receptors is still elusive. By using a combination of genomic sequence analysis and cDNA-library screening, we have cloned various cDNAs of the tobacco budworm Heliothis virescens encoding candidate olfactory receptors. A comparison of all identified receptor types not only highlighted their overall high degree of sequence diversity but also led to the identification of a small group of receptors sharing >40% identity. In RT-PCR analysis it was found that distinct members of this group were expressed exclusively in the antennae of male moths. In situ hybridization experiments revealed that the male-specific expression of these receptor types was confined to antennal cells located beneath sensillar hair structures (sensilla triochoidea), which have been shown to contain pheromone-sensitive neurons. Moreover, two-color double in situ-hybridization approaches uncovered that cells expressing one of these receptor types were surrounded by cells expressing pheromone-binding proteins, as expected for a pheromone-sensitive sensillum. These findings suggest that receptors like Heliothis receptor 14-16 (HR14-HR16) may render antennal cells responsive to pheromones.
Collapse
Affiliation(s)
- J Krieger
- Institute of Physiology 230, University of Hohenheim, Garbenstrasse 30, 70599 Stuttgart, Germany
| | | | | | | | | | | |
Collapse
|
39
|
Krieger J. [From polysomnographic signal to diagnosis of the principal respiratory disorders observed during sleep]. Rev Mal Respir 2004; 21:S26-34. [PMID: 15107677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Affiliation(s)
- J Krieger
- Hôpitaux Universitaires de Strasbourg.
| |
Collapse
|
40
|
Krieger J, Schröder C, Erhardt C. [Cortical arousal, autonomic arousal. Evaluation techniques and clinical importance]. Rev Neurol (Paris) 2003; 159:6S107-12. [PMID: 14646811] [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: 04/27/2023]
Abstract
The respiratory disorders expressed by obstructive hypopneas and apneas during sleep, as well as the sequences of crescendo in respiratory effort without hypopneas or apneas which define the upper airway resistance syndrome, terminate with (thanks to) an arousal, defined by EEG changes. In some cases, the activation of the central nervous system is restricted to a sympathetic activation, which has been mainly studied in the cardiovascular area, and is not always accompanied by a cortical arousal. Various approaches (heart rate, blood pressure, pulse transit time, peripheral arterial tonometry) make the identification of sympathetic activation possible. Sympathetic activation seems to be more sensitive than cortical arousal to the stimulations generated by the respiratory system via an activation of mechanoreceptors stimulated by the increased respiratory effort in response to total or partial occlusion of the upper airway. The mechanisms of the cortical or autonomic arousal are not fully understood, but their detection could be a diagnostic tool for the identification of such disorders. Such tools are currently under validation.
Collapse
Affiliation(s)
- J Krieger
- Service d'Explorations Fonctionnelles du Système Nerveux et de Pathologie du Sommeil, Clinique Neurologique, Hôpitaux Universitaires de Strasbourg.
| | | | | |
Collapse
|
41
|
Krieger J, Klink O, Mohl C, Raming K, Breer H. A candidate olfactory receptor subtype highly conserved across different insect orders. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2003; 189:519-26. [PMID: 12827420 DOI: 10.1007/s00359-003-0427-x] [Citation(s) in RCA: 162] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2003] [Revised: 04/19/2003] [Accepted: 04/26/2003] [Indexed: 11/29/2022]
Abstract
Candidate olfactory receptors of the moth Heliothis virescens were found to be extremely diverse from receptors of the fruitfly Drosophila melanogaster and the mosquito Anopheles gambiae, but there is one exception. The moth receptor type HR2 shares a rather high degree of sequence identity with one olfactory receptor type both from Drosophila (Dor83b) and from Anopheles (AgamGPRor7); moreover, in contrast to all other receptors, this unique receptor type is expressed in numerous antennal neurons. Here we describe the identification of HR2 homologues in two further lepidopteran species, the moths Antheraea pernyi and Bombyx mori, which share 86-88% of their amino acids. In addition, based on RT-PCR experiments HR2 homologues were discovered in antennal cDNA of the honey bee (Apis mellifera; Hymenoptera), the blowfly (Calliphora erythrocephala; Diptera) and the mealworm (Tenebrio molitor; Coleoptera). Comparison of all HR2-related receptors revealed a high degree of sequence conservation across insect orders. In situ hybridization of antennal sections from the bee and the blowfly support the notion that HR2-related receptors are generally expressed in a very large number of antennal cells. This, together with the high degree of conservation suggests that this unique receptor subtype may fulfill a special function in chemosensory neurons of insects.
Collapse
Affiliation(s)
- J Krieger
- Institute of Physiology (230), University of Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany.
| | | | | | | | | |
Collapse
|
42
|
Newcomb JR, Rivnay B, Bastos CM, Ocain TD, Gordon K, Gregory P, Turci SM, Sterne KA, Jesson M, Krieger J, Jenson JC, Jones B. In vitro immunomodulatory activity of ruthenium complexes. Inflamm Res 2003; 52:263-71. [PMID: 12835898 DOI: 10.1007/s00011-003-1169-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 10/20/2022] Open
Abstract
OBJECTIVE AND DESIGN We have explored the in vitro immunomodulatory effects of pure ruthenium red and a series of pyridine and imidazole substituted ruthenium complexes (RCs). MATERIAL Human peripheral blood lymphocytes and purified T cells were used in these studies along with various cell lines. METHODS Cells were treated with dilutions of RCs and assessed in various assays of immune function, cytotoxicity and cell cycle progression. RESULTS RCs efficiently blocked T cell receptor (TCR)-mediated stimulation (IC(50)'s in the low nM range) of human peripheral blood lymphocytes (hPBL) by various agents, including tetanus toxoid, alloantigens, superantigens, and receptor-specific antibodies. RCs are not cytotoxic to T cells. Antiproliferative activity was also observed for B cells. Some non-lymphoid cell lines or primary cultures showed sensitivity to the RCs, but only at higher concentrations. The inhibitory effect on human T cells was assessed and demonstrated at the level of proliferation (DNA synthesis), IL-2 secretion, and IL-2 receptor (CD25) upregulation. RCs also inhibited IL-2-mediated proliferation of antigen-induced T-cell blasts and the IL-2-dependent T cell line Kit-225. Cell cycle analysis indicates that RCs inhibit the progression of activated T cells from G(0)/G(1) to S phase. CONCLUSIONS Since the mechanism of T cell inhibition by RCs appears to be different than that of rapamycin (RAP) or cyclosporin A (CsA), they may provide a new tool to investigate intracellular signaling in T cells, and may present novel opportunities for immunosuppression
Collapse
Affiliation(s)
- J R Newcomb
- Amgen Inc, One Kendall Square, Cambridge, MA 02139, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Krieger J, McNicholas WT, Levy P, De Backer W, Douglas N, Marrone O, Montserrat J, Peter JH, Rodenstein D. Public health and medicolegal implications of sleep apnoea. Eur Respir J 2002; 20:1594-609. [PMID: 12503722 DOI: 10.1183/09031936.02.00404502] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- J Krieger
- Dept of Respiratory Medicine, St. Vincent's University Hospital, Elm Park, Dublin 4, Ireland.
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Quera-Salva MA, Philip P, Taillard J, Letrequeser R, Allain H, Garcia-Acosta S, Kermad I, Krieger J, Dib M. [Study of the real situation of improvement by Zopiclone in treatment of insomnia among persons working during night shifts]. Rev Neurol (Paris) 2002; 158:1102-6. [PMID: 12451343] [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: 02/27/2023]
Abstract
UNLABELLED We investigated the effect of adapted management of sleep on the duration and quality of sleep in shift workers working the night shift. Twenty-nine shift workers suffering from insomnia were included and treated with zopiclone (7.5mg/day) or placebo according to a random double-blind protocol. Patients completed a sleep diary and a wrist actigraph was used to evaluate episodes of rest/activity. A self-administered subjective sleep questionnaire was filled out just after awakening. Zopicone was found to increase the duration of sleep significantly (p<0.05) over the baseline duration after the first and second night on duty. Subjective estimation of sleep was better in patients taking zopiclone who exhibited a smaller number of shorter awakening episodes. IN CONCLUSION zopiclone improves the quality and duration of sleep in shift workers suffering from insomnia.
Collapse
Affiliation(s)
- M A Quera-Salva
- Hôpital Raymond Poincaré, AP-HP, Université Paris Ouest, Garches
| | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Picimbon JF, Dietrich K, Krieger J, Breer H. Identity and expression pattern of chemosensory proteins in Heliothis virescens (Lepidoptera, Noctuidae). Insect Biochem Mol Biol 2001; 31:1173-1181. [PMID: 11583930 DOI: 10.1016/s0965-1748(01)00063-7] [Citation(s) in RCA: 53] [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] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Analyzing the chemosensory organs of the moth Heliothis virescens, three proteins belonging to the family of insect chemosensory proteins (CSPs) have been cloned; they are called HvirCSP1, HvirCSP2 and HvirCSP3. The HvirCSPs show about 50% identity between each other and 30-76% identity to CSPs from other species. Overall, they are rather hydrophilic proteins but include a conserved hydrophobic motif. Tissue distribution and temporal expression pattern during the last pupal stages were assessed by Northern blots. HvirCSP mRNAs were detected in various parts of the adult body with a particular high expression level in legs. The expression of HvirCSP1 in legs started early during adult development, in parallel with the appearance of the cuticle. HvirCSP1 mRNA was detectable five days before eclosion (day E-5), increased dramatically on day E-3 and remained at high level into adult life. The tissue distribution and the time course of appearance of HvirCSPs are in agreement with a possible role in contact chemosensation.
Collapse
Affiliation(s)
- J F Picimbon
- Institute of Physiology, University of Hohenheim, Garbenstrasse 30, 70593, Stuttgart, Germany.
| | | | | | | |
Collapse
|
46
|
Rogers ME, Krieger J, Vogt RG. Antennal SNMPs (sensory neuron membrane proteins) of Lepidoptera define a unique family of invertebrate CD36-like proteins. J Neurobiol 2001; 49:47-61. [PMID: 11536197 DOI: 10.1002/neu.1065] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SNMP1-Apol is an antennal-specific protein of the wild silk moth Antheraea polyphemus; the protein is abundantly expressed and localized to the receptor membranes of sex-pheromone specific olfactory sensory neurons (OSNs). SNMP1-Apol is thought to function in odor detection based on its olfactory-specific expression, localization within OSNs, developmental time of expression, and apparent homology to the CD36 family of membrane-bound receptor proteins. In the current study, SNMP1-Apol homologues were identified from the moths Bombyx mori, Heliothis virescens, and Manduca sexta. These species posses antennal mRNAs encoding proteins with amino acid sequence identities ranging from 75-80%; these proteins are collectively designated SNMP1. A second M. sexta SNMP homologue, previously identified and partially sequenced [Robertson et al.: Insect Mol Biol 8:501-518, 1999] was fully sequenced and characterized. The encoded protein shares only 26-27% sequence identity with the SNMP1 proteins, and is thus designated SNMP2-Msex. The SNMP sequences were used to identify 14 and four possible homologues in Drosophila melanogaster and Caenorhabditis elegans genome databases, respectively; thus, greatly expanding CD36 family membership among the invertebrate lineages. Despite their sequence difference, SNMP1-Msex and SNMP2-Msex expression is localized to OSNs and occurs simultaneously with the onset of olfactory function. These findings suggest that SNMPs play a central role in odor detection in insects, and that the CD36 gene family is widely represented among animal phyla. The SNMPs are the only identified neuronal members of the CD36 family, and as such expand the activities of this gene family into roles influencing brain function and behavioral action.
Collapse
Affiliation(s)
- M E Rogers
- Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA.
| | | | | |
Collapse
|
47
|
Ohashi T, Yukitake M, Slavin A, Krieger J, Hafler DA. In vitro evidence that immunuaffinity-purified MOG contains immunogenic quantities of contaminating mouse IgG; techniques for producing Ig-free MOG. J Neuroimmunol 2001; 118:194-202. [PMID: 11498254 DOI: 10.1016/s0165-5728(01)00321-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 10/27/2022]
Abstract
Myelin oligodendrocyte glycoprotein (MOG) has attracted considerable attention due to its possible role in multiple sclerosis (MS). Previous studies have shown that MOG-reactive T cells are more commonly detected in MS patients than controls. In this report, we studied human MOG-reactive T cell clones generated from healthy individuals as well as MS patients. Our results indicate that immunoaffinity-purified MOG, which was routinely used in prior studies, is contaminated by anti-MOG antibody (mouse IgG), despite the inability to detect IgG by Western blotting. Here, we used continuous SDS-PAGE, which enabled us to isolate highly purified MOG devoid of contaminating mouse IgG.
Collapse
Affiliation(s)
- T Ohashi
- Center for Neurologic Diseases, Laboratory of Molecular Immunology, Brigham and Women's Hospital and Harvard Medical School, 77 Avenue Louis Pasteur, HIM 786, Boston, MA 02115, USA
| | | | | | | | | |
Collapse
|
48
|
Kessler R, Chaouat A, Schinkewitch P, Faller M, Casel S, Krieger J, Weitzenblum E. The obesity-hypoventilation syndrome revisited: a prospective study of 34 consecutive cases. Chest 2001; 120:369-76. [PMID: 11502631 DOI: 10.1378/chest.120.2.369] [Citation(s) in RCA: 220] [Impact Index Per Article: 9.6] [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: 12/22/2022] Open
Abstract
STUDY OBJECTIVES Obesity has many detrimental effects on the respiratory function and may lead to chronic hypoventilation in some patients, an association known as the obesity-hypoventilation syndrome (OHS). In many cases, patients with OHS also have sleep apneas. Hereafter, we describe several features of a cohort (n = 34) of patients with OHS and show the comparisons with a large cohort (n = 220) of patients with obstructive sleep apnea syndrome (OSAS). We compare also OHS patients with a group of patients with the association of OSAS and COPD, also known as "overlap" patients. DESIGN Descriptive analysis of prospectively collected clinical data. SETTING Respiratory care unit and sleep laboratory of university hospital. RESULTS In OHS patients, OSAS was present in most of the cases (23 of 26 patients). However, in three patients, OHS was not associated with OSAS, showing that obesity per se may lead to chronic hypoventilation. As expected by definition, OHS patients had, on average the worst diurnal arterial blood gas measurements, compared to the other groups. For the OHS patients, the mean diurnal PaO(2) was 59 +/- 7 mm Hg, which was significantly different from the PaO(2) of the OSAS patients (75 +/- 10 mm Hg; p = 0,001) but also from the overlap patients (66 +/- 10 mm Hg; p = 0.015). Pulmonary hypertension (ie, mean pulmonary artery pressure > 20 mm Hg) was more frequent in OHS patients than in "pure" OSAS patients (58% vs 9%; p = 0.001). CONCLUSION Patients with OSAS and chronic respiratory insufficiency had in most cases an associated OHS or COPD. Patients with OHS were older than patients with pure OSAS. They had mild-to-moderate degrees of restrictive ventilatory pattern due to obesity. Severe gas exchange impairment and pulmonary hypertension were quite frequent. The association of OHS and OSAS was the rule. However, in three patients, OHS was not associated with OSAS, suggesting that OHS is an autonomous disease.
Collapse
Affiliation(s)
- R Kessler
- Department of Pulmonology and Sleep Laboratory, University Hospital, Strasbourg, France.
| | | | | | | | | | | | | |
Collapse
|
49
|
Campanacci V, Krieger J, Bette S, Sturgis JN, Lartigue A, Cambillau C, Breer H, Tegoni M. Revisiting the specificity of Mamestra brassicae and Antheraea polyphemus pheromone-binding proteins with a fluorescence binding assay. J Biol Chem 2001; 276:20078-84. [PMID: 11274212 DOI: 10.1074/jbc.m100713200] [Citation(s) in RCA: 146] [Impact Index Per Article: 6.3] [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: 11/06/2022] Open
Abstract
Pheromone-binding proteins (PBPs), located in the sensillum lymph of pheromone-responsive antennal hairs, are thought to transport the hydrophobic pheromones to the chemosensory membranes of olfactory neurons. It is currently unclear what role PBPs may play in the recognition and discrimination of species-specific pheromones. We have investigated the binding properties and specificity of PBPs from Mamestra brassicae (MbraPBP1), Antheraea polyphemus (ApolPBP1), Bombyx mori (BmorPBP), and a hexa-mutant of MbraPBP1 (Mbra1-M6), mutated at residues of the internal cavity to mimic that of BmorPBP, using the fluorescence probe 1-aminoanthracene (AMA). AMA binds to MbraPBP1 and ApolPBP1, however, no binding was observed with either BmorPBP or Mbra1-M6. The latter result indicates that relatively limited modifications to the PBP cavity actually interfere with AMA binding, suggesting that AMA binds in the internal cavity. Several pheromones are able to displace AMA from the MbraPBP1- and ApolPBP1-binding sites, without, however, any evidence of specificity for their physiologically relevant pheromones. Moreover, some fatty acids are also able to compete with AMA binding. These findings bring into doubt the currently held belief that all PBPs are specifically tuned to distinct pheromonal compounds.
Collapse
Affiliation(s)
- V Campanacci
- Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 6098, CNRS et Universités d'Aix-Marseille I et II, 31 ch. Joseph Aiguier, 13402 Marseille, Cedex 20, France
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Oldham NJ, Krieger J, Breer H, Svatos A. Detection and removal of an artefact fatty acid from the binding site of recombinant Bombyx mori pheromone-binding protein. Chem Senses 2001; 26:529-31. [PMID: 11418499 DOI: 10.1093/chemse/26.5.529] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [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: 11/14/2022] Open
Abstract
Recombinant Bombyx mori pheromone-binding protein (PBP), purified from an Escherichia coli expression system, has been found to contain (11Z)-octadecenoic acid (cis-vaccenic acid) as an artefact ligand. An efficient delipidation procedure is described to overcome what would appear to be a general problem with recombinant lepidopteran PBPs.
Collapse
Affiliation(s)
- N J Oldham
- Max-Planck-Institute for Chemical Ecology, Carl-Zeiss-Promenade 10, D-07745 Jena, Germany.
| | | | | | | |
Collapse
|