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Friedman N, Hashiloni-Dolev Y. Sedated masculinity: the use of anaesthesia during vasectomy in Israel. Cult Health Sex 2023; 25:398-412. [PMID: 35290162 DOI: 10.1080/13691058.2022.2048893] [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] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 02/28/2022] [Indexed: 06/14/2023]
Abstract
Vasectomy is considered a permanent form of contraception for men that can help reduce reproductive inequality. Its underutilisation in the context of the threats it may pose to perceptions of traditional masculinity has been closely investigated, but the lived experience of the procedure itself has been largely overlooked. This paper examines the experience of having a vasectomy in Israel, focusing on the recommended form of anaesthesia. Drawing on 15 semi-structured interviews with Israeli men who have experienced vasectomy, we found that the choice of anaesthesia has a significant impact on the meaning and experience of vasectomy. Unlike the widespread use of local anaesthesia during vasectomy in other countries, vasectomy in Israel is performed almost exclusively under twilight sedation administered intravenously. Based on our findings, we argue that framing vasectomy as an operation that requires sedation is related to views of masculinity and reproduction. Our data suggest that vasectomy in Israel is constituted as a potentially traumatic event, and anaesthesia is employed to protect patients from feelings of embarrassment and discomfort. We conclude that the prevailing method of sedation perpetuates the silencing and marginalisation of vasectomy as a contraceptive method, and consequently, its very limited accessibility in Israel.
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Affiliation(s)
- Noga Friedman
- Gender Studies Program, Tel Aviv University, Tel Aviv, Israel
| | - Yael Hashiloni-Dolev
- Department of Sociology and Anthropology, Ben-Gurion University of the Negev, Beersheba, Israel
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2
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Swaney E, Murnane B, Heard L, Friedman N, O'Brien D. Absence of COVID-19 workplace transmission from hairdressers in Victoria, Australia. Public Health Res Pract 2022; 32:31232110. [DOI: 10.17061/phrp31232110] [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: 11/30/2022] Open
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3
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Van Truong T, Ghosh M, Misra R, Krichevski O, Wachtel E, Friedman N, Sheves M, Patchornik G. Conjugation of native membranes via linear oligo-amines. Colloids Surf B Biointerfaces 2020; 193:111101. [DOI: 10.1016/j.colsurfb.2020.111101] [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] [Received: 12/04/2019] [Revised: 04/13/2020] [Accepted: 04/28/2020] [Indexed: 11/28/2022]
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4
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Van Truong T, Ghosh M, Wachtel E, Friedman N, Jung KH, Sheves M, Patchornik G. Promoting crystallization of intrinsic membrane proteins with conjugated micelles. Sci Rep 2020; 10:12199. [PMID: 32699228 PMCID: PMC7376161 DOI: 10.1038/s41598-020-68689-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 06/29/2020] [Indexed: 11/09/2022] Open
Abstract
A new technique for promoting nucleation and growth of membrane protein (MP) crystals from micellar environments is reported. It relies on the conjugation of micelles that sequester MPs in protein detergent complexes (PDCs). Conjugation via amphiphilic [metal:chelator] complexes presumably takes place at the micelle/water interface, thereby bringing the PDCs into proximity, promoting crystal nucleation and growth. We have successfully applied this approach to two light-driven proton pumps: bacteriorhodopsin (bR) and the recently discovered King Sejong 1-2 (KS1-2), using the amphiphilic 4,4'-dinonyl-2,2'-dipyridyl (Dinonyl) (0.7 mM) chelator in combination with Zn2+, Fe2+, or Ni2+ (0.1 mM). Crystal growth in the presence of the [metal-chelator] complexes leads to purple, hexagonal crystals (50-75 µm in size) of bR or pink, rectangular/square crystals (5-15 µm) of KS1-2. The effects of divalent cation identity and concentration, chelator structure and concentration, ionic strength and pH on crystal size, morphology and process kinetics, are described.
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Affiliation(s)
- Thien Van Truong
- Department of Chemical Sciences, Ariel University, 40700, Ariel, Israel
| | - Mihir Ghosh
- Faculty of Chemistry, Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Ellen Wachtel
- Faculty of Chemistry, Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Noga Friedman
- Faculty of Chemistry, Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Kwang-Hwan Jung
- Department of Life Science and Institute of Biological Interfaces, Sogang University, Seoul, 121-742, South Korea
| | - Mordechai Sheves
- Faculty of Chemistry, Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Guy Patchornik
- Department of Chemical Sciences, Ariel University, 40700, Ariel, Israel.
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Friedman N, Pancer Z, Savic R, Tseng F, Lee MS, Mclean L, Bagli DJ, Tessaro MO. Accuracy of point-of-care ultrasound by pediatric emergency physicians for testicular torsion. J Pediatr Urol 2019; 15:608.e1-608.e6. [PMID: 31455581 DOI: 10.1016/j.jpurol.2019.07.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 07/05/2019] [Indexed: 10/26/2022]
Abstract
INTRODUCTION Acute scrotum is a common presentation to the pediatric emergency department, and ultrasound is frequently used to narrow the differential diagnosis. Point-of-care ultrasound (POCUS) is increasingly used by urologists and emergency physicians and could potentially be used to detect pediatric testicular torsion. OBJECTIVES This study aimed to determine the accuracy of POCUS by pediatric emergency physicians in diagnosing testicular torsion and the agreement between point-of-care ultrasound and final diagnosis for other causes of acute scrotum. STUDY DESIGN A chart review of patients presenting to the study emergency department who received POCUS by a pediatric emergency physician, as well as radiology department ultrasound and/or surgery, was performed. Charts were reviewed for POCUS diagnoses, final diagnoses, and imaging time metrics. RESULTS A total of 120 patients met study criteria, with 12 cases of testicular torsion. The diagnostic accuracy of POCUS for testicular torsion is described in the summary table. For all causes of acute scrotum, point-of-care ultrasound agreed with final diagnosis in 70% (95% confidence interval [CI] 62-78%) of cases, and more experienced point-of-care ultrasound users displayed higher agreement with final diagnosis. Point-of-care ultrasound results were generated a median of 73 min (Q1 = 51, Q3 = 112) before radiology department ultrasound results. DISCUSSION Scrotal POCUS performed by pediatric emergency physicians appears to be an accurate tool to detect testicular torsion in children with acute scrotum and saves time compared with radiology ultrasound. The study results may not be generalizable to hospitals without a multidisciplinary POCUS system for quality assurance and image sharing. Future work on POCUS for acute scrotum should investigate its impact on patient outcomes, cost-effectiveness, and family satisfaction. CONCLUSION Point-of-care ultrasound by pediatric emergency physicians is accurate for detecting testicular torsion in children with acute scrotum and could expedite diagnosis of this time-sensitive condition.
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Affiliation(s)
- N Friedman
- Emergency Point-of-Care Ultrasound Program, Division of Pediatric Emergency Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada.
| | - Z Pancer
- Department of Pediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
| | - R Savic
- Emergency Point-of-Care Ultrasound Program, Division of Pediatric Emergency Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
| | - F Tseng
- Emergency Point-of-Care Ultrasound Program, Division of Pediatric Emergency Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
| | - M S Lee
- Emergency Point-of-Care Ultrasound Program, Division of Pediatric Emergency Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
| | - L Mclean
- Emergency Point-of-Care Ultrasound Program, Division of Pediatric Emergency Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
| | - D J Bagli
- Division of Urology, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
| | - M O Tessaro
- Emergency Point-of-Care Ultrasound Program, Division of Pediatric Emergency Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON, M5G 1X8, Canada
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Hudes G, Friedman N, Rosenstreich D. M304 SOY MILK ANAPHYLAXIS IN PATIENTS WITH NEGATIVE SOY SPECIFIC IGE AND SKIN TEST: DIAGNOSTIC CHALLENGE. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.408] [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]
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7
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Maiti T, Machado A, Nagel S, Frizon L, Friedman N. Deep brain stimulation in children: analysis of indication, outcome and complications. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.830] [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: 11/26/2022] Open
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8
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Dhandapani G, Howard A, Truong TV, Baiju TV, Kesselman E, Friedman N, Wachtel E, Sheves M, Danino D, Namboothiri INN, Patchornik G. A general platform for antibody purification utilizing engineered-micelles. MAbs 2019; 11:583-592. [PMID: 30618334 DOI: 10.1080/19420862.2019.1565749] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
We introduce a new concept and potentially general platform for antibody (Ab) purification that does not rely on chromatography or specific ligands (e.g., Protein A); rather, it makes use of detergent aggregates capable of efficiently capturing Ab while rejecting hydrophilic impurities. Captured Ab are then extracted from the aggregates in pure form without co-extraction of hydrophobic impurities or aggregate dissolution. The aggregates studied consist of conjugated "Engineered-micelles" built from the nonionic detergent, Tween-20; bathophenanthroline, a hydrophobic metal chelator, and Fe2+ions. When tested in serum-free media with or without bovine serum albumin as additive, human or mouse IgGs were recovered with good overall yields (70-80%, by densitometry). Extraction of IgGs with 7 different buffers at pH 3.8 sheds light on possible interactions between captured Ab and their surrounding detergent matrix that lead to purity very similar to that obtained via Protein A or Protein G resins. Extracted Ab preserve their secondary structure, specificity and monomeric character as determined by circular dichroism, enzyme-linked immunosorbent assay and dynamic light scattering, respectively.
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Affiliation(s)
| | - Assaf Howard
- a Department of Chemical Sciences , Ariel University , Ariel , Israel
| | - Thien Van Truong
- a Department of Chemical Sciences , Ariel University , Ariel , Israel
| | - Thekke V Baiju
- b Department of Chemistry , Indian Institute of Technology Bombay , Powai , India
| | - Ellina Kesselman
- c Faculty of Biotechnology and Food Engineering , Technion , Haifa , Israel
| | - Noga Friedman
- d Faculty of Chemistry , Weizmann Institute of Science , Rehovot , Israel
| | - Ellen Wachtel
- d Faculty of Chemistry , Weizmann Institute of Science , Rehovot , Israel
| | - Mordechai Sheves
- d Faculty of Chemistry , Weizmann Institute of Science , Rehovot , Israel
| | - Dganit Danino
- c Faculty of Biotechnology and Food Engineering , Technion , Haifa , Israel
| | | | - Guy Patchornik
- a Department of Chemical Sciences , Ariel University , Ariel , Israel
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9
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Musbat L, Assis S, Dilger JM, El-Baba TJ, Fuller DR, Knudsen JL, Kiefer HV, Hirshfeld A, Friedman N, Andersen LH, Sheves M, Clemmer DE, Toker Y. Action and Ion Mobility Spectroscopy of a Shortened Retinal Derivative. J Am Soc Mass Spectrom 2018; 29:2152-2159. [PMID: 30062478 DOI: 10.1007/s13361-018-2033-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 04/15/2018] [Revised: 07/08/2018] [Accepted: 07/09/2018] [Indexed: 06/08/2023]
Abstract
The development of tandem ion mobility spectroscopy (IMS) known as IMS-IMS has led to extensive research into isomerizations of isolated molecules. Many recent works have focused on the retinal chromophore which is the optical switch used in animal vision. Here, we study a shortened derivative of the chromophore, which exhibits a rich IM spectrum allowing for a detailed analysis of its isomerization pathways, and show that the longer the chromophore is, the lower the barrier energies for isomerization are. Graphical Abstract.
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Affiliation(s)
- Lihi Musbat
- Department of Physics and Institute of Nanotechnology, Bar-Ilan University, 5290002, Ramat-Gan, Israel
| | - Shirrel Assis
- Department of Physics and Institute of Nanotechnology, Bar-Ilan University, 5290002, Ramat-Gan, Israel
| | - Jonathan M Dilger
- Spectrum Warfare Systems Department, NSWC Crane Division, Crane, IN, 47522, USA
| | - Tarick J El-Baba
- Department of Chemistry, Indiana University Bloomington, Indiana, 47405, USA
| | - Daniel R Fuller
- Department of Chemistry, Indiana University Bloomington, Indiana, 47405, USA
| | | | - Hjalte V Kiefer
- Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
| | - Amiram Hirshfeld
- Department of Organic Chemistry, Weizmann Institute of Science, 7610001, Rehovot, Israel
| | - Noga Friedman
- Department of Organic Chemistry, Weizmann Institute of Science, 7610001, Rehovot, Israel
| | - Lars H Andersen
- Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
| | - Mordechai Sheves
- Department of Organic Chemistry, Weizmann Institute of Science, 7610001, Rehovot, Israel
| | - David E Clemmer
- Department of Chemistry, Indiana University Bloomington, Indiana, 47405, USA
| | - Yoni Toker
- Department of Physics and Institute of Nanotechnology, Bar-Ilan University, 5290002, Ramat-Gan, Israel.
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10
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Segatta F, Gdor I, Réhault J, Taioli S, Friedman N, Sheves M, Rivalta I, Ruhman S, Cerullo G, Garavelli M. Ultrafast Carotenoid to Retinal Energy Transfer in Xanthorhodopsin Revealed by the Combination of Transient Absorption and Two-Dimensional Electronic Spectroscopy. Chemistry 2018; 24:12084-12092. [PMID: 30048017 DOI: 10.1002/chem.201803525] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 07/26/2018] [Indexed: 11/10/2022]
Abstract
By comparing two-dimensional electronic spectroscopy (2DES) and Pump-Probe (PP) measurements on xanthorhodopsin (XR) and reduced-xanthorhodopsin (RXR) complexes, the ultrafast carotenoid-to-retinal energy transfer pathway is revealed, at very early times, by an excess of signal amplitude at the associated cross-peak and by the carotenoid bleaching reduction due to its ground state recovery. The combination of the measured 2DES and PP spectroscopic data with theoretical modelling allows a clear identification of the main experimental signals and a comprehensive interpretation of their origin and dynamics. The remarkable velocity of the energy transfer, despite the non-negligible energy separation between the two chromophores, and the analysis of the underlying transport mechanism, highlight the role played by the ground state carotenoid vibrations in assisting the process.
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Affiliation(s)
- Francesco Segatta
- European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-FBK), 38123, Trento, Italy.,Department of Industrial Chemistry, University of Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Itay Gdor
- Department of Physical Chemistry, The Hebrew University, Jerusalem, 9190401, Israel
| | - Julien Réhault
- Department für Chemie und Biochemie, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Simone Taioli
- European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-FBK), 38123, Trento, Italy
| | - Noga Friedman
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Mordechai Sheves
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Ivan Rivalta
- Laboratoire de Chimie UMR 5182, Université Lyon, ENS de Lyon, CNRS, Unversité Lyon 1, Allée d'Italie 46, FR-69342, Lyon, France
| | - Sanford Ruhman
- Department of Physical Chemistry, The Hebrew University, Jerusalem, 9190401, Israel
| | - Giulio Cerullo
- Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy
| | - Marco Garavelli
- Department of Industrial Chemistry, University of Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
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11
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Shavit I, Jacob R, Friedman N, Capua T, Klein A, Chistyakov I, Moldaver I, Krupik D, Munchak I, Abozaid S, Rimon A, Meirson G, Leiba R, Cohen DM. Effect of patient and nurse ethnicity on emergency department analgesia for children with appendicitis in israeli government hospitals. Eur J Pain 2018; 22:1711-1717. [PMID: 29883525 DOI: 10.1002/ejp.1257] [Citation(s) in RCA: 4] [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] [Accepted: 06/01/2018] [Indexed: 12/21/2022]
Abstract
BACKGROUND Ethnicity is a risk factor for disparate Emergency Department (ED) analgesia. We aimed to explore ethnic variations in the administration of ED analgesia to children with acute appendicitis in Israeli government hospitals. METHODS Children discharged with an International Classification of Disease-Ninth Revision diagnosis of acute appendicitis between 2010 and 2015 were included. The association between patient ethnicity (Jewish, Arab) and analgesia administration (any, opioid) was assessed. Age, gender, triage category, pain score and time of arrival were tested as possible confounders. The effect of patient-nurse ethnic discordance (PNED) was examined. RESULTS Overall, 4714 children with acute appendicitis, 3520 Jewish and 1194 Arab, were cared for in the EDs; 1516 (32.2%) received any analgesia and 368 (7.8%) opioid analgesia. Stratified by pain score, no statistical differences were found in the administration of any or opioid analgesia between Jewish and Arab patients with either severe pain or moderate pain. In multivariate modelling adjusted for pain score and triage category, the rates of any analgesia for Arab and Jewish patients were 31.8% (95% CI, 30.9-32.6) and 36.5% (95% CI, 36.0-36.9), adjusted OR (aOR) = 1.16 (95% CI, 0.98-1.38), respectively. The rates of opioid analgesia for Arab and Jewish patients were 8.5% (95% CI, 8.2-8.9) and 7.9% (95% CI, 7.3-8.7), aOR = 0.77; (95% CI, 0.59-1.22), respectively. Jewish and Arab nurses treated proportionally fewer patients from the opposite ethnicity with any analgesia (p < 0.01). CONCLUSION Emergency Department analgesia was markedly low, and not associated with patient ethnicity. PNED was associated with decreased rates of analgesia. SIGNIFICANCE Emergency Department analgesia for children with acute appendicitis in Israeli government hospitals is markedly low. Patient-provider ethnic discordance may negatively influence the provision of analgesia. Significant efforts should be undertaken in order to increase analgesia provision rates and reduce social inequality.
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Affiliation(s)
- I Shavit
- Emergency Department, Ruth Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - R Jacob
- Emergency Department, Ruth Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - N Friedman
- Emergency Department, Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel
| | - T Capua
- Emergency Department, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, Israel
| | - A Klein
- Pediatric Department, Hillel Yafe Medical Center, Hadera, Israel
| | - I Chistyakov
- Pediatric Emergency, B'nai Zion Medical Center, Haifa, Israel
| | - I Moldaver
- Pediatric Emergency, Barzilai Medical Center, Ashkelon, Israel
| | - D Krupik
- Pediatric Emergency, Ziv Medical Center, Safed, Israel
| | - I Munchak
- Pediatric Emergency, Western Galilee Medical Center, Nahariya, Israel
| | - S Abozaid
- Pediatric Department, Baruch Padeh Medical Center, Poria, Israel
| | - A Rimon
- Emergency Department, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, Israel
| | - G Meirson
- Emergency Department, Wolfson Medical Center, Holon, Israel
| | - R Leiba
- Quality of Care Unit, Rambam Health Care Campus, Haifa, Israel
| | - D M Cohen
- Division of Emergency Medicine, Nationwide Children's Hospital, The Ohio State University, Columbus, OH, USA
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12
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Kalaora S, Wolf Y, Reuben A, Rosenberg S, Lotem M, Sahin U, Wargo J, Friedman N, Admon A, Samuels Y. 24 Combined analysis of antigen presentation and T cell recognition reveals restricted immune responses in melanoma. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.24] [Citation(s) in RCA: 1] [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: 11/03/2022] Open
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13
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Sobremonte-King M, Conwell W, Friedman N, Hughes B, Brinton J, Fetrow K, Essig-Peppard A, Kline C, Halbower AC. 0791 Validating the Use of Peripheral Arterial Tonometry in Detecting Obstructive Sleep Apnea in Children 5–12 years old. Sleep 2018. [DOI: 10.1093/sleep/zsy061.790] [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: 11/12/2022] Open
Affiliation(s)
| | - W Conwell
- Colorado Permanente Medical Group, Denver, CO
| | - N Friedman
- Children’s Hospital Colorado, Aurora, CO
| | - B Hughes
- Children’s Hospital Colorado, Aurora, CO
| | - J Brinton
- Children’s Hospital Colorado, Aurora, CO
| | - K Fetrow
- Children’s Hospital Colorado, Aurora, CO
| | | | - C Kline
- Children’s Hospital Colorado, Aurora, CO
| | - A C Halbower
- Children’s Hospital Colorado, Aurora, CO
- Children’s Hospital Colorado, Aurora, CO
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14
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Varade V, Markus T, Vankayala K, Friedman N, Sheves M, Waldeck DH, Naaman R. Bacteriorhodopsin based non-magnetic spin filters for biomolecular spintronics. Phys Chem Chem Phys 2018; 20:1091-1097. [DOI: 10.1039/c7cp06771b] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We discuss spin injection and spin valves, which are based on organic and biomolecules, that offer the possibility to overcome some of the limitations of solid-state devices, which are based on ferromagnetic metal electrodes.
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Affiliation(s)
- Vaibhav Varade
- Department of Chemical and Biological Physics
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Tal Markus
- Department of Chemical and Biological Physics
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Kiran Vankayala
- Department of Chemical and Biological Physics
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Noga Friedman
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Mordechai Sheves
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel
| | | | - Ron Naaman
- Department of Chemical and Biological Physics
- Weizmann Institute of Science
- Rehovot
- Israel
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15
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Smolensky Koganov E, Leitus G, Rozin R, Weiner L, Friedman N, Sheves M. Cation Binding to Xanthorhodopsin: Electron Paramagnetic Resonance and Magnetic Studies. J Phys Chem B 2017; 121:4333-4340. [PMID: 28379004 DOI: 10.1021/acs.jpcb.6b12670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Xanthorhodopsin (xR) is a member of the retinal protein family and acts as a proton pump in the cell membranes of the extremely halophilic eubacterium Salinibacter ruber. In addition to the retinal chromophore, xR contains a carotenoid, which acts as a light-harvesting antenna as it transfers 40% of the quanta it absorbs to the retinal. Our previous studies have shown that the CD and absorption spectra of xR are dramatically affected due to the protonation of two different residues. It is still unclear whether xR can bind cations. Electron paramagnetic resonance (EPR) spectroscopy used in the present study revealed that xR can bind divalent cations, such as Mn2+ and Ca2+, to deionized xR (DI-xR). We also demonstrate that xR can bind 1 equiv of Mn2+ to a high-affinity binding site followed by binding of ∼40 equiv in cooperative manner and ∼100 equiv of Mn2+ that are weakly bound. SQUID magnetic studies suggest that the high cooperative binding of Mn2+ cations to xR is due to the formation of Mn2+ clusters. Our data demonstrate that Ca2+ cations bind to DI-xR with a lower affinity than Mn2+, supporting the assumption that binding of Mn2+ occurs through cluster formation, because Ca2+ cations cannot form clusters in contrast to Mn2+.
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Affiliation(s)
- Elena Smolensky Koganov
- Department of Organic Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Gregory Leitus
- Department of Organic Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Rinat Rozin
- Department of Organic Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Lev Weiner
- Department of Organic Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Noga Friedman
- Department of Organic Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Mordechai Sheves
- Department of Organic Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science , Rehovot 76100, Israel
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16
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Gdor I, Mani-Hazan M, Friedman N, Sheves M, Ruhman S. Membrane Independence of Ultrafast Photochemistry in Pharaonis Halorhodopsin: Testing the Role of Bacterioruberin. J Phys Chem B 2017; 121:2319-2325. [PMID: 28230358 DOI: 10.1021/acs.jpcb.6b12698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ultrafast photochemistry of pharaonis halorhodopsin (p-HR) in the intact membrane of Natronomonas pharaonis has been studied by photoselective femtosecond pump-hyperspectral probe spectroscopy with high time resolution. Two variants of this sample were studied, one with wild-type retinal prosthetic groups and another after shifting the retinal absorption deep into the blue range by reducing the Schiff base linkage, and the results were compared to a previous study on detergent-solubilized p-HR. This comparison shows that retinal photoisomerization dynamics is identical in the membrane and in the solubilized sample. Selective photoexcitation of bacterioruberin, which is associated with the protein in the native membrane, in wild-type and reduced samples, demonstrates conclusively that unlike the carotenoids associated with some bacterial retinal proteins the carrotenoid in p-HR does not act as a light-harvesting antenna.
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Affiliation(s)
- Itay Gdor
- Institute of Chemistry, the Hebrew University , Jerusalem 91904, Israel
| | - Maya Mani-Hazan
- Department of Organic Chemistry, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Noga Friedman
- Department of Organic Chemistry, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Mordechai Sheves
- Department of Organic Chemistry, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Sanford Ruhman
- Institute of Chemistry, the Hebrew University , Jerusalem 91904, Israel
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17
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Musbat L, Nihamkin M, Toker Y, Dilger JM, Fuller DR, El-Baba TJ, Clemmer DE, Sarkar S, Kronik L, Hirshfeld A, Friedman N, Sheves M. Measurements of the stabilities of isolated retinal chromophores. Phys Rev E 2017; 95:012406. [PMID: 28208402 DOI: 10.1103/physreve.95.012406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 08/15/2016] [Indexed: 06/06/2023]
Abstract
The barrier energies for isomerization and fragmentation were measured for a series of retinal chromophore derivatives using a tandem ion mobility spectrometry approach. These measurements allow us to quantify the effect of charge delocalization on the rigidity of chromophores. We find that the role of the methyl group on the C13 position is pivotal regarding the ground state dynamics of the chromophore. Additionally, a correlation between quasi-equilibrium isomer distribution and fragmentation pathways is observed.
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Affiliation(s)
- L Musbat
- Department of Physics and Institute of Nanotechnology, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - M Nihamkin
- Department of Physics and Institute of Nanotechnology, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Y Toker
- Department of Physics and Institute of Nanotechnology, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - J M Dilger
- Spectrum Warfare Systems Department, NSWC Crane Division, Crane, Indiana 47522, USA
| | - D R Fuller
- Department of Chemistry, Indiana University Bloomington, Indiana 47405, USA
| | - T J El-Baba
- Department of Chemistry, Indiana University Bloomington, Indiana 47405, USA
| | - D E Clemmer
- Department of Chemistry, Indiana University Bloomington, Indiana 47405, USA
| | - S Sarkar
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - L Kronik
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - A Hirshfeld
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - N Friedman
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - M Sheves
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
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18
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Roy P, Kantor-Uriel N, Mishra D, Dutta S, Friedman N, Sheves M, Naaman R. Spin-Controlled Photoluminescence in Hybrid Nanoparticles Purple Membrane System. ACS Nano 2016; 10:4525-4531. [PMID: 27018195 PMCID: PMC4850504 DOI: 10.1021/acsnano.6b00333] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 03/27/2016] [Indexed: 05/29/2023]
Abstract
Spin-dependent photoluminescence (PL) quenching of CdSe nanoparticles (NPs) has been explored in the hybrid system of CdSe NP purple membrane, wild-type bacteriorhodopsin (bR) thin film on a ferromagnetic (Ni-alloy) substrate. A significant change in the PL intensity from the CdSe NPs has been observed when spin-specific charge transfer occurs between the retinal and the magnetic substrate. This feature completely disappears in a bR apo membrane (wild-type bacteriorhodopsin in which the retinal protein covalent bond was cleaved), a bacteriorhodopsin mutant (D96N), and a bacteriorhodopsin bearing a locked retinal chromophore (isomerization of the crucial C13═C14 retinal double bond was prevented by inserting a ring spanning this bond). The extent of spin-dependent PL quenching of the CdSe NPs depends on the absorption of the retinal, embedded in wild-type bacteriorhodopsin. Our result suggests that spin-dependent charge transfer between the retinal and the substrate controls the PL intensity from the NPs.
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Affiliation(s)
- Partha Roy
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
| | - Nirit Kantor-Uriel
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
| | - Debabrata Mishra
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
| | - Sansa Dutta
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
| | - Noga Friedman
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
| | - Mordechai Sheves
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
| | - Ron Naaman
- Department
of Chemical Physics and Department of Organic Chemistry, Weizmann Institute, Rehovot 76100, Israel
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19
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Musbat L, Nihamkin M, Ytzhak S, Hirshfeld A, Friedman N, Dilger JM, Sheves M, Toker Y. Isotope Labeling Study of Retinal Chromophore Fragmentation. J Phys Chem A 2016; 120:2547-9. [DOI: 10.1021/acs.jpca.6b02525] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lihi Musbat
- Institute
of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Maria Nihamkin
- Institute
of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Shany Ytzhak
- Institute
of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Amiram Hirshfeld
- Chemistry
Department, Weizmann Institute of Science, Rehovot 978007, Israel
| | - Noga Friedman
- Chemistry
Department, Weizmann Institute of Science, Rehovot 978007, Israel
| | - Jonathan M. Dilger
- Spectrum
Warfare Systems Department, NSWC Crane Division, Crane, Indiana 47522, United States
| | - Mordechai Sheves
- Chemistry
Department, Weizmann Institute of Science, Rehovot 978007, Israel
| | - Yoni Toker
- Institute
of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
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20
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Einati H, Mishra D, Friedman N, Sheves M, Naaman R. Light-controlled spin filtering in bacteriorhodopsin. Nano Lett 2015; 15:1052-6. [PMID: 25621438 PMCID: PMC4330096 DOI: 10.1021/nl503961p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [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: 10/14/2014] [Revised: 01/05/2015] [Indexed: 05/21/2023]
Abstract
The role of the electron spin in chemistry and biology has received much attention recently owing to to the possible electromagnetic field effects on living organisms and the prospect of using molecules in the emerging field of spintronics. Recently the chiral-induced spin selectivity effect was observed by electron transmission through organic molecules. In the present study, we demonstrated the ability to control the spin filtering of electrons by light transmitted through purple membranes containing bacteriorhodopsin (bR) and its D96N mutant. The spin-dependent electrochemical cyclic voltammetry (CV) and chronoamperometric measurements were performed with the membranes deposited on nickel substrates. High spin-dependent electron transmission through the membranes was observed; however, after the samples were illuminated by 532 nm light, the spin filtering in the D96N mutant was dramatically reduced whereas the light did not have any effect on the wild-type bR. Beyond demonstrating spin-dependent electron transmission, this work also provides an interesting insight into the relationship between the structure of proteins and spin filtering by conducting electrons.
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Affiliation(s)
- Hila Einati
- Department of Chemical Physics and ‡Department of Organic Chemistry, Weizmann Institute , Rehovot 76100, Israel
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21
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Dutta S, Nair DK, Namboothiri INN, Wachtel E, Friedman N, Sheves M, Patchornik G. Engineered-membranes and engineered-micelles as efficient tools for purification of halorhodopsin and bacteriorhodopsin. Analyst 2015; 140:204-12. [DOI: 10.1039/c4an01423e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We describe two alternative and complementary purification methods for halorhodopsin and bacteriorhodopsin.
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Affiliation(s)
- Sansa Dutta
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Divya K. Nair
- Department of Chemistry
- Indian Institute of Technology
- Bombay
- India
| | | | - Ellen Wachtel
- Chemical Research Infrastructure Unit
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Noga Friedman
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Mordechai Sheves
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel
| | - Guy Patchornik
- Department of Biological Chemistry
- Ariel University
- Ariel
- Israel
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22
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Smolensky Koganov E, Brumfeld V, Friedman N, Sheves M. Origin of Circular Dichroism of Xanthorhodopsin. A Study with Artificial Pigments. J Phys Chem B 2014; 119:456-64. [DOI: 10.1021/jp510534s] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Vlad Brumfeld
- Department
of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Noga Friedman
- Department
of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mordechai Sheves
- Department
of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
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23
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Mukhopadhyay S, Cohen SR, Marchak D, Friedman N, Pecht I, Sheves M, Cahen D. Nanoscale electron transport and photodynamics enhancement in lipid-depleted bacteriorhodopsin monomers. ACS Nano 2014; 8:7714-7722. [PMID: 25003581 DOI: 10.1021/nn500202k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Potential future use of bacteriorhodopsin (bR) as a solid-state electron transport (ETp) material requires the highest possible active protein concentration. To that end we prepared stable monolayers of protein-enriched bR on a conducting HOPG substrate by lipid depletion of the native bR. The ETp properties of this construct were then investigated using conducting probe atomic force microscopy at low bias, both in the ground dark state and in the M-like intermediate configuration, formed upon excitation by green light. Photoconductance modulation was observed upon green and blue light excitation, demonstrating the potential of these monolayers as optoelectronic building blocks. To correlate protein structural changes with the observed behavior, measurements were made as a function of pressure under the AFM tip, as well as humidity. The junction conductance is reversible under pressure changes up to ∼300 MPa, but above this pressure the conductance drops irreversibly. ETp efficiency is enhanced significantly at >60% relative humidity, without changing the relative photoactivity significantly. These observations are ascribed to changes in protein conformation and flexibility and suggest that improved electron transport pathways can be generated through formation of a hydrogen-bonding network.
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24
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Lippitsch ME, Riegler M, Aussenegg FR, Friedman N, Sheves M, Mazur Y, Margulies L. Linear Dichroism Spectroscopy of Retinal with Picosecond Time Resolution. Z NATURFORSCH C 2014. [DOI: 10.1515/znc-1985-11-1222] [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: 11/15/2022]
Abstract
Abstract
For the first time linear dichroism spectroscopy has been extended to the picosecond time regime. 11-cis retinal, all-trans retinal and 1,8-diphenyl-1,3,5,7-octatetraene (DPOT) are incorporated into polyethylene films and oriented by stretching the films. By measuring picosecond transient absorption spectra polarized parallel and perpendicular to the stretching direction and calculating the dichroic ratio we get informations about the molecular geometry in excited singlet and triplet states. The results may have relevance to vision.
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Affiliation(s)
- M. E. Lippitsch
- Institut für Experimentalphysik. Karl-Franzens-Universität. Universitätsplatz 5, A-8010 Graz, Austria
| | - M. Riegler
- Institut für Experimentalphysik. Karl-Franzens-Universität. Universitätsplatz 5, A-8010 Graz, Austria
| | - F. R. Aussenegg
- Institut für Experimentalphysik. Karl-Franzens-Universität. Universitätsplatz 5, A-8010 Graz, Austria
| | - N. Friedman
- The Weizman Institute of Science, Rehovot, Israel
| | - M. Sheves
- The Weizman Institute of Science, Rehovot, Israel
| | - Y. Mazur
- The Weizman Institute of Science, Rehovot, Israel
| | - L. Margulies
- The Weizman Institute of Science, Rehovot, Israel
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25
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26
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Sheves M, Friedman N, Levendis D, Margulies L, Mazur Y. Conformational Analysis of Flexibletrans-Dienes by Polarization Spectroscopy. Isr J Chem 2013. [DOI: 10.1002/ijch.197900055] [Citation(s) in RCA: 4] [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: 11/08/2022]
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27
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Patchornik G, Danino D, Kesselman E, Wachtel E, Friedman N, Sheves M. Purification of a membrane protein with conjugated engineered micelles. Bioconjug Chem 2013; 24:1270-5. [PMID: 23758098 DOI: 10.1021/bc400069w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A novel method for purifying membrane proteins is presented. The approach makes use of engineered micelles composed of a nonionic detergent, β-octylglucoside, and a hydrophobic metal chelator, bathophenanthroline. Via the chelators, the micelles are specifically conjugated, i.e., tethered, in the presence of Fe(2+) ions, thereby forming micellar aggregates which provide the environment for separation of lipid-soluble membrane proteins from water-soluble proteins. The micellar aggregates (here imaged by cryo-transmission electron microscopy) successfully purify the light driven proton pump, bacteriorhodopsin (bR), from E. coli lysate. Purification takes place within 15 min and can be performed both at room temperature and at 4 °C. More than 94% of the water-soluble macromolecules in the lysate are excluded, with recovery yields of the membrane protein ranging between 74% and 85%. Since this approach does not require precipitants, high concentrations of detergent to induce micellar aggregates, high temperature, or changes in pH, it is suggested that it may be applied to the purification of a wide variety of membrane proteins.
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Affiliation(s)
- Guy Patchornik
- Department of Biological Chemistry, Ariel University, 70400, Israel.
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Polonsky M, Zaretsky I, Friedman N. Dynamic single-cell measurements of gene expression in primary lymphocytes: challenges, tools and prospects. Brief Funct Genomics 2013; 12:99-108. [DOI: 10.1093/bfgp/els061] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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29
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Wand A, Rozin R, Eliash T, Friedman N, Jung KH, Sheves M, Ruhman S. Probing how initial retinal configuration controls photochemical dynamics in retinal proteins. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134107018] [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: 11/14/2022] Open
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30
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Patchornik G, Namboothiri IN, Nair DK, Wachtel E, Cohen SR, Friedman N, Sheves M. Engineered-membranes: A novel concept for clustering of native lipid bilayers. J Colloid Interface Sci 2012; 388:300-5. [DOI: 10.1016/j.jcis.2012.08.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Revised: 08/09/2012] [Accepted: 08/13/2012] [Indexed: 10/28/2022]
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31
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Wand A, Loevsky B, Friedman N, Sheves M, Ruhman S. Probing Ultrafast Photochemistry of Retinal Proteins in the Near-IR: Bacteriorhodopsin and Anabaena Sensory Rhodopsin vs Retinal Protonated Schiff Base in Solution. J Phys Chem B 2012; 117:4670-9. [DOI: 10.1021/jp309189y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amir Wand
- Institute of Chemistry
and the Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
| | - Boris Loevsky
- Institute of Chemistry
and the Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
| | - Noga Friedman
- Department of Organic
Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mordechai Sheves
- Department of Organic
Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sanford Ruhman
- Institute of Chemistry
and the Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
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32
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Chillag-Talmor O, Giladi N, Linn S, Gurevich T, El-Ad B, Silverman B, Friedman N, Peretz C. Estimation of Parkinson’s disease survival in Israeli men and women, using health maintenance organization pharmacy data in a unique approach. J Neurol 2012; 260:62-70. [DOI: 10.1007/s00415-012-6584-5] [Citation(s) in RCA: 10] [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: 02/29/2012] [Revised: 06/08/2012] [Accepted: 06/09/2012] [Indexed: 11/24/2022]
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Taute C, Friedman N. Outcomes after Thymectomy in Children with Juvenile Myasthenia Gravis (P05.178). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p05.178] [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: 11/15/2022] Open
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34
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Taute C, Friedman N. Three Cases of Muscle-Specific-Kinase Antibody-Positive Juvenile Myasthenia Gravis: Presentation, Clinical Course and Response to Treatment (P05.177). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p05.177] [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: 11/15/2022] Open
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35
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Wand A, Friedman N, Sheves M, Ruhman S. Ultrafast Photochemistry of Light-Adapted and Dark-Adapted Bacteriorhodopsin: Effects of the Initial Retinal Configuration. J Phys Chem B 2012; 116:10444-52. [DOI: 10.1021/jp2125284] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amir Wand
- Institute of Chemistry and the
Farkash Center for Light-Induced Processes, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat
Ram, Jerusalem 91904, Israel
| | - Noga Friedman
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mordechai Sheves
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sanford Ruhman
- Institute of Chemistry and the
Farkash Center for Light-Induced Processes, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat
Ram, Jerusalem 91904, Israel
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36
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Sepunaru L, Friedman N, Pecht I, Sheves M, Cahen D. Temperature-Dependent Solid-State Electron Transport through Bacteriorhodopsin: Experimental Evidence for Multiple Transport Paths through Proteins. J Am Chem Soc 2012; 134:4169-76. [DOI: 10.1021/ja2097139] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lior Sepunaru
- Departments
of Materials and Interfaces, ‡Organic Chemistry, and §Immunology, Weizmann Institute of Science, POB 26, Rehovot 76100,
Israel
| | - Noga Friedman
- Departments
of Materials and Interfaces, ‡Organic Chemistry, and §Immunology, Weizmann Institute of Science, POB 26, Rehovot 76100,
Israel
| | - Israel Pecht
- Departments
of Materials and Interfaces, ‡Organic Chemistry, and §Immunology, Weizmann Institute of Science, POB 26, Rehovot 76100,
Israel
| | - Mordechai Sheves
- Departments
of Materials and Interfaces, ‡Organic Chemistry, and §Immunology, Weizmann Institute of Science, POB 26, Rehovot 76100,
Israel
| | - David Cahen
- Departments
of Materials and Interfaces, ‡Organic Chemistry, and §Immunology, Weizmann Institute of Science, POB 26, Rehovot 76100,
Israel
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37
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Theisen A, Rosenfeld JA, Shane K, McBride KL, Atkin JF, Gaba C, Hoo J, Kurczynski TW, Schnur RE, Coffey LB, Zackai EH, Schimmenti L, Friedman N, Zabukovec M, Ball S, Pagon R, Lucas A, Brasington CK, Spence JE, Sparks S, Banks V, Smith W, Friedberg T, Wyatt PR, Aust M, Tervo R, Crowley A, Skidmore D, Lamb AN, Ravnan B, Sahoo T, Schultz R, Torchia BS, Sgro M, Chitayat D, Shaffer LG. Refinement of the Region for Split Hand/Foot Malformation 5 on 2q31.1. Mol Syndromol 2011; 1:262-271. [PMID: 22140379 DOI: 10.1159/000328405] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2011] [Indexed: 12/23/2022] Open
Abstract
Background: Deletions that encompass 2q31.1 have been proposed as a microdeletion syndrome with common clinical features, including intellectual disability/developmental delay, microcephaly, cleft palate, growth delay, and hand/foot anomalies. In addition, several genes within this region have been proposed as candidates for split hand-foot malformation 5 (SHFM5). Methods: To delineate the genotype-phenotype correlation between deletions of this region, we identified 14 individuals with deletions at 2q31.1 detected by microarray analysis for physical and developmental disabilities. Results: All subjects for whom detailed clinical records were available had neurological deficits of varying degree. Seven subjects with deletions encompassing the HOXD cluster had hand/foot anomalies of varying severity, including syndactyly, brachydactyly, and ectrodactyly. Of 7 subjects with deletions proximal to the HOXD cluster, 5 of which encompassed DLX1/DLX2, none had clinically significant hand/foot anomalies. In contrast to previous reports, the individuals in our study did not display a characteristic gestalt of dysmorphic facial features. Conclusion: The absence of hand/foot anomalies in any of the individuals with deletions of DLX1/DLX2 but not the HOXD cluster supports the hypothesis that haploinsufficiency of the HOXD cluster, rather than DLX1/DLX2, accounts for the skeletal abnormalities in subjects with 2q31.1 microdeletions.
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Affiliation(s)
- A Theisen
- Signature Genomic Laboratories, Spokane, Wash
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Balasubramanian M, Smith K, Basel-Vanagaite L, Feingold MF, Brock P, Gowans GC, Vasudevan PC, Cresswell L, Taylor EJ, Harris CJ, Friedman N, Moran R, Feret H, Zackai EH, Theisen A, Rosenfeld JA, Parker MJ. Case series: 2q33.1 microdeletion syndrome--further delineation of the phenotype. J Med Genet 2011; 48:290-8. [PMID: 21343628 DOI: 10.1136/jmg.2010.084491] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Recurrent deletions of 2q32q33 have recently been reported as a new microdeletion syndrome, clinical features of which include significant learning difficulties, growth retardation, dysmorphic features, thin and sparse hair, feeding difficulties, and cleft or high palate. Haploinsufficiency of one gene within the deleted region, SATB2, has been suggested to be responsible for most of the features of the syndrome. This article describes seven previously unreported patients with deletions at 2q33.1, all partially overlapping the previously described critical region for the 2q33.1 microdeletion syndrome. The deletions ranged in size from 35 kb to 10.4 Mb, with the smallest deletion entirely within the SATB2 gene. Patients demonstrated significant developmental delay and challenging behaviour, a particular behavioural phenotype that seems to be emerging with more reported patients with this condition. One patient in this cohort has a deletion entirely within SATB2 and has a cleft palate, whereas several patients with larger deletions have a high arched palate. In addition, one other patient has significant orthopaedic problems with ligamentous laxity. Interestingly, this patient has a deletion that lies just distal to SATB2. The orthopaedic problems have not been reported previously and are possibly an additional feature of this syndrome. Overall, this report provides further evidence that the SATB2 gene is the critical gene in this microdeletion syndrome. In addition, because the individuals in this study range in age from 3-19 years, these patients will help define the natural progression of the phenotype in patients with this microdeletion.
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Affiliation(s)
- M Balasubramanian
- Sheffield Clinical Genetics Service, Sheffield NHS Foundation Trust, Western Bank, Sheffield S10 2TH, UK.
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Affiliation(s)
- Boris Loevsky
- Institute of Chemistry and the Farkas Center for Light-Induced Processes, The Hebrew University, Jerusalem 91904, Israel
| | - Amir Wand
- Institute of Chemistry and the Farkas Center for Light-Induced Processes, The Hebrew University, Jerusalem 91904, Israel
| | - Oshrat Bismuth
- Institute of Chemistry and the Farkas Center for Light-Induced Processes, The Hebrew University, Jerusalem 91904, Israel
| | - Noga Friedman
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mordechai Sheves
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sanford Ruhman
- Institute of Chemistry and the Farkas Center for Light-Induced Processes, The Hebrew University, Jerusalem 91904, Israel
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Gdor I, Zhu J, Loevsky B, Smolensky E, Friedman N, Sheves M, Ruhman S. Investigating excited state dynamics of salinixanthin and xanthorhodopsin in the near-infrared. Phys Chem Chem Phys 2010; 13:3782-7. [PMID: 21183996 DOI: 10.1039/c0cp01734e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Excited state dynamics of native Xanthorhodopsin (XR), of an XR sample with a reduced prosthetic group, and of the associated Carotenoid (CAR) salinixanthin (SX) in ethanol were investigated by hyperspectral Near Infrared (NIR) probing. Global kinetic analysis shows that: (1) unlike the transient spectra recorded in the visible, fitting of the NIR data requires only two phases of exponential spectral evolution, assigned to internal conversion from S(2) → S(1) and from S(1) → S(0) of the carotene. (2) The rate of the internal conversion from S(2) → S(1) in the reduced sample is well fit with a decay time of 130 fs, significantly longer than in XR and in SX, both of which are well fit with τ ≈ 100 fs. This increased lifetime is consistent with a ∼30% efficiency of ET from SX to retinal in XR. (3) S(1) of salinixanthin is verified to lie ∼12,700 cm(-1) above the ground electronic surface, excluding its involvement in the retinal sensitization in XR. (4) The oscillator strength of the S(1) → S(2) transition is determined to be no more than 0.16, despite its symmetry allowedness. (5) No long lived NIR absorbance decay assignable to the carotenoid S* state was detected in any of the samples. Inconsistencies concerning previously determined S(2) lifetimes and kinetic schemes used to model these data are discussed.
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Affiliation(s)
- Itay Gdor
- Institute of Chemistry and The Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel
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41
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Ron I, Sepunaru L, Itzhakov S, Belenkova T, Friedman N, Pecht I, Sheves M, Cahen D. Proteins as electronic materials: electron transport through solid-state protein monolayer junctions. J Am Chem Soc 2010; 132:4131-40. [PMID: 20210314 DOI: 10.1021/ja907328r] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electron transfer (ET) through proteins, a fundamental element of many biochemical reactions, is studied intensively in aqueous solutions. Over the past decade, attempts were made to integrate proteins into solid-state junctions in order to study their electronic conductance properties. Most such studies to date were conducted with one or very few molecules in the junction, using scanning probe techniques. Here we present the high-yield, reproducible preparation of large-area monolayer junctions, assembled on a Si platform, of proteins of three different families: azurin (Az), a blue-copper ET protein, bacteriorhodopsin (bR), a membrane protein-chromophore complex with a proton pumping function, and bovine serum albumin (BSA). We achieve highly reproducible electrical current measurements with these three types of monolayers using appropriate top electrodes. Notably, the current-voltage (I-V) measurements on such junctions show relatively minor differences between Az and bR, even though the latter lacks any known ET function. Electron Transport (ETp) across both Az and bR is much more efficient than across BSA, but even for the latter the measured currents are higher than those through a monolayer of organic, C18 alkyl chains that is about half as wide, therefore suggesting transport mechanism(s) different from the often considered coherent mechanism. Our results show that the employed proteins maintain their conformation under these conditions. The relatively efficient ETp through these proteins opens up possibilities for using such biomolecules as current-carrying elements in solid-state electronic devices.
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Affiliation(s)
- Izhar Ron
- Departments of Materials and Interfaces, Weizmann Institute of Science, POB 26, Rehovot 76100, Israel
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Zhu J, Gdor I, Smolensky E, Friedman N, Sheves M, Ruhman S. Photoselective Ultrafast Investigation of Xanthorhodopsin and Its Carotenoid Antenna Salinixanthin. J Phys Chem B 2010; 114:3038-45. [DOI: 10.1021/jp910845h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jingyi Zhu
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Itay Gdor
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Elena Smolensky
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Noga Friedman
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mordechai Sheves
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sanford Ruhman
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
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Bismuth O, Komm P, Friedman N, Eliash T, Sheves M, Ruhman S. Deciphering Excited State Evolution in Halorhodopsin with Stimulated Emission Pumping. J Phys Chem B 2010; 114:3046-51. [DOI: 10.1021/jp910853n] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oshrat Bismuth
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Pavel Komm
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Noga Friedman
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Tamar Eliash
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mordechai Sheves
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sanford Ruhman
- Institute of Chemistry and the Farkas Center for Light Induced Processes, The Hebrew University, Jerusalem 91904, Israel, and Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
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Gross R, Wolf MMN, Schumann C, Friedman N, Sheves M, Li L, Engelhard M, Trentmann O, Neuhaus HE, Diller R. Primary photoinduced protein response in bacteriorhodopsin and sensory rhodopsin II. J Am Chem Soc 2010; 131:14868-78. [PMID: 19778046 DOI: 10.1021/ja904218n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Essential for the biological function of the light-driven proton pump, bacteriorhodopsin (BR), and the light sensor, sensory rhodopsin II (SRII), is the coupling of the activated retinal chromophore to the hosting protein moiety. In order to explore the dynamics of this process we have performed ultrafast transient mid-infrared spectroscopy on isotopically labeled BR and SRII samples. These include SRII in D(2)O buffer, BR in H(2)(18)O medium, SRII with (15)N-labeled protein, and BR with (13)C(14)(13)C(15)-labeled retinal chromophore. Via observed shifts of infrared difference bands after photoexcitation and their kinetics we provide evidence for nonchromophore bands in the amide I and the amide II region of BR and SRII. A band around 1550 cm(-1) is very likely due to an amide II vibration. In the amide I region, contributions of modes involving exchangeable protons and modes not involving exchangeable protons can be discerned. Observed bands in the amide I region of BR are not due to bending vibrations of protein-bound water molecules. The observed protein bands appear in the amide I region within the system response of ca. 0.3 ps and in the amide II region within 3 ps, and decay partially in both regions on a slower time scale of 9-18 ps. Similar observations have been presented earlier for BR5.12, containing a nonisomerizable chromophore (R. Gross et al. J. Phys. Chem. B 2009, 113, 7851-7860). Thus, the results suggest a common mechanism for ultrafast protein response in the artificial and the native system besides isomerization, which could be induced by initial chromophore polarization.
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Affiliation(s)
- Ruth Gross
- University of Kaiserslautern, Department of Physics, Erwin-Schrodinger-Strasse, 67663 Kaiserslautern, Germany
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Segman RH, Goltser-Dubner T, Weiner I, Canetti L, Galili-Weisstub E, Milwidsky A, Pablov V, Friedman N, Hochner-Celnikier D. Blood mononuclear cell gene expression signature of postpartum depression. Mol Psychiatry 2010; 15:93-100, 2. [PMID: 19581911 DOI: 10.1038/mp.2009.65] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [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] [Indexed: 12/21/2022]
Abstract
In sorrow thou shalt bring forth children (Genesis 3:16) seems as relevant today, with one of seven mothers afflicted by a depressive episode, constituting the most common medical complication after delivery. Why mothers are variably affected by mood symptoms postpartum remains unclear, and the pathogenesis and early molecular indicators of this divergent outcome have not been described. We applied a case-control design comparing differential global gene expression profiles in blood mononuclear cells sampled shortly after delivery at the time of inception of postpartum depression (PD). Nine antidepressant naive mothers showing high depressive scores and developing a persisting major depressive episode with postpartum onset were compared with 10 mothers showing low depressive scores and no depressive symptoms on prospective follow-up. A distinctive gene expression signature was observed after delivery among mothers with an emergent PD, with a significant overabundance of transcripts showing a high-fold differential expression between groups, and correlating with depressive symptom severity among all mothers. Early expression signatures correctly classified the majority of PD patients and controls. Those developing persisting PD exhibit a relative downregulation of transcription after delivery, with differential immune activation, and decreased transcriptional engagement in cell proliferation, and DNA replication and repair processes. Our data provide initial evidence indicating that blood cells sampled shortly after delivery may harbor valuable prognostic information for identifying the onset of persisting PD. Some of the informative transcripts and pathways may be implicated in the differential vulnerability that underlies depression pathogenesis.
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Affiliation(s)
- R H Segman
- Department of Psychiatry, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
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46
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Azuri J, Gelerenter R, Dushinat M, Friedman N, Kokia E. Raising awareness for the diagnosis and treatment of erectile dysfunction in patients with high risk to develop ED. Int J Impot Res 2009; 21:249-52. [DOI: 10.1038/ijir.2009.15] [Citation(s) in RCA: 3] [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: 11/09/2022]
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47
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Gross R, Schumann C, Wolf MMN, Herbst J, Diller R, Friedman N, Sheves M. Ultrafast Protein Conformational Alterations in Bacteriorhodopsin and Its Locked Analogue BR5.12. J Phys Chem B 2009; 113:7851-60. [PMID: 19422251 DOI: 10.1021/jp810042f] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ruth Gross
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
| | - Christian Schumann
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
| | - Matthias M. N. Wolf
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
| | - Johannes Herbst
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
| | - Rolf Diller
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
| | - Noga Friedman
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
| | - Mordechai Sheves
- Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany, and Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
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Smolensky E, Friedman N, Sheves M. Retinal-Salinixanthin Interactions In Xanthorhodopsin: A Study Using Artificial Pigments. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.2704] [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: 11/26/2022] Open
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Ron I, Friedman N, Cahen D, Sheves M. Selective electroless deposition of metal clusters on solid-supported bacteriorhodopsin: applications to orientation labeling and electrical contacts. Small 2008; 4:2271-2278. [PMID: 19016493 DOI: 10.1002/smll.200800524] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Controlling the orientation of bacteriorhodopsin (bR) monolayers is an important step in studying and utilizing such membranes in a solid-state configuration in, for example, photoelectric applications. Macroscopic monolayers of bR have been fabricated in a variety of ways, but characterization of the distribution of the two possible orientations in which the membrane fragments can adsorb has not yet been addressed experimentally. Here, an approach is presented that labels only one of the membrane surfaces by electroless growth of metal nanoparticles on top of the solid-supported membranes. In this way, it is possible to observe which surface of the membranes is actually adsorbed to the substrate. How this technique serves to interface the membranes with a top metal contact for further electrical measurements is also demonstrated.
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Affiliation(s)
- Izhar Ron
- Department of Materials and Interfaces, Weizmann Institute of Science, P. O. Box 26, Rehovot 76100, Israel
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Kanabrocki EL, Sothern RB, Ryan MD, Kahn S, Augustine G, Johnson C, Foley S, Gathing A, Eastman G, Friedman N, Nemchausky BA, Kaplan E. Circadian characteristics of serum calcium, magnesium and eight trace elements and of their metallo-moieties in urine of healthy middle-aged men. Clin Ter 2008; 159:329-346. [PMID: 18998036] [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: 05/27/2023]
Abstract
OBJECTIVE To monitor the around-the-clock distribution of serum and urine concentrations of calcium, magnesium and eight trace elements and of those same elements in urine after their dialysis, and to statistically describe their circadian characteristics by chronobiological procedures. MATERIALS AND METHODS Serum and urine samples were collected every 3h over a single 24h period from eleven clinically-healthy male subjects, 41-60 years of age, and were analyzed for calcium (Ca), magnesium (Mg), iron (Fe), copper (Cu), zinc (Zn), lead (Pb), cadmium (Cd), cobalt (Co), chromium (Cr), and nickel (Ni). Urines were also sequentially dialyzed against ammonium-barbituric acid buffer at pH 7.35+/-0.02 using a 12.000-14.000 molecular weight exclusion sieve and then reanalyzed for the same elements. Urine concentrations were adjusted by urine volume to reflect a 3h excretion rate. Time-series were analyzed for circadian time-effect by ANOVA and for rhythm characteristics by the single cosinor fitting procedure. RESULTS The dialysis effectively removed 90% of total solids, 97% of urea, 92% creatinine, 72% uric acid, and essentially all of glucose. It also removed 99% of potassium (K), 96% of sodium (Na), 65% of Ca and P, 55% of Mg, 41% of Zn and 88% of Ni. A significant or borderline-significant 24h rhythm in serum was detected for Ca, Mg, Fe, Cu, Zn, Cd and Cr; in untreated urine for Ca, Fe, Cu, Zn, Ni, creatinine and volume; and in dialyzed urine for Ca, Fe, Cu, Zn, Pb, Cr, Cd and Ni. A 12h component was significant or borderline-significant in serum for Mg, Fe, Zn, and Cd; in untreated urine for volume, creatinine, Ca, Mg, Cu, and Ni; and in dialyzed urine for Ca, Mg, Fe, Cu, Zn, and Cr. In general, values in serum were lowest near the onset of sleep and highest in the first half of the day (between 02:28 and 13:56 h), while highest values in untreated or dialyzed urine were found several hours later in the day and at night. CONCLUSIONS Significant circadian variations were found in levels of nearly every element that was measured in blood and urine of 11 healthy men, but with highest and lowest levels occurring at different times. This suggests not only that urine concentrations need to be adjusted for collection time interval and urine volume, but that different biological limits at different times of the 24h day should be applied for serum and urinary monitoring of trace elements. We also found that the non-dialyzable segments of these elements in urine represent metallo-moieties composed of proteinacious matter greater than 12,000-14,000 Daltons. Further studies would be of interest to reveal time specificity for metabolic functions associated with any of these trace elements.
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Affiliation(s)
- E L Kanabrocki
- Nuclear Medicine, Edward Hines Jr., Veterans Administration Hospital, Hines, IL 60141, USA.
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