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Mycobacterium Tuberculosis
Studies of a Ring-Cleaving Dioxygenase Illuminate the Role of Cholesterol Metabolism in the Pathogenesis of Mycobacterium tuberculosis Katherine C. Yam1., Igor D’Angelo1., Rainer Kalscheuer2., Haizhong Zhu1¤, Jian-Xin Wang3, Victor Snieckus3, Lan H. Ly4, Paul J. Converse5, William R. Jacobs Jr.2, Natalie Strynadka1, Lindsay D. Eltis1,6* 1 Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia, Canada, 2 Howard Hughes Medical Institute, Albert Einstein College of Medicine, Bronx, New York, United States of America, 3 Department of Chemistry, Queen’s University, Kingston, Ontario, Canada, 4 Department of Microbial and Molecular Pathogenesis, Texas A&M University Health Science Center, College Station, Texas, United States of America, 5 Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America, 6 Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, Canada Abstract Mycobacterium tuberculosis, the etiological agent of TB, possesses a cholesterol catabolic pathway implicated in pathogenesis. This pathway includes an iron-dependent extradiol dioxygenase, HsaC, that cleaves catechols. Immuno- compromised mice infected with a DhsaC mutant of M. tuberculosis H37Rv survived 50% longer than mice infected with the wild-type strain. In guinea pigs, the mutant disseminated more slowly to the spleen, persisted less successfully in the lung, and caused little pathology. These data establish that, while cholesterol metabolism by M. tuberculosis appears to be most important during the chronic stage of infection, it begins much earlier and may contribute to the pathogen’s dissemination within the host. Purified HsaC efficiently cleaved the catecholic cholesterol metabolite, DHSA (3,4-dihydroxy-9,10- 21 21 seconandrost-1,3,5(10)-triene-9,17-dione; kcat/Km = 14.460.5 mM s ), and was inactivated by a halogenated substrate analogue (partition coefficient,50). -
Stapled Peptides—A Useful Improvement for Peptide-Based Drugs
molecules Review Stapled Peptides—A Useful Improvement for Peptide-Based Drugs Mattia Moiola, Misal G. Memeo and Paolo Quadrelli * Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy; [email protected] (M.M.); [email protected] (M.G.M.) * Correspondence: [email protected]; Tel.: +39-0382-987315 Received: 30 July 2019; Accepted: 1 October 2019; Published: 10 October 2019 Abstract: Peptide-based drugs, despite being relegated as niche pharmaceuticals for years, are now capturing more and more attention from the scientific community. The main problem for these kinds of pharmacological compounds was the low degree of cellular uptake, which relegates the application of peptide-drugs to extracellular targets. In recent years, many new techniques have been developed in order to bypass the intrinsic problem of this kind of pharmaceuticals. One of these features is the use of stapled peptides. Stapled peptides consist of peptide chains that bring an external brace that force the peptide structure into an a-helical one. The cross-link is obtained by the linkage of the side chains of opportune-modified amino acids posed at the right distance inside the peptide chain. In this account, we report the main stapling methodologies currently employed or under development and the synthetic pathways involved in the amino acid modifications. Moreover, we report the results of two comparative studies upon different kinds of stapled-peptides, evaluating the properties given from each typology of staple to the target peptide and discussing the best choices for the use of this feature in peptide-drug synthesis. Keywords: stapled peptide; structurally constrained peptide; cellular uptake; helicity; peptide drugs 1. -
Plant Proteomics As a Tool for Elucidating the Molecular Mechanisms Underlying Signaling and Plant Interactions with the Environment
PALACKÝ UNIVERESITY OLOMOUC Faculty of Science Plant proteomics as a tool for elucidating the molecular mechanisms underlying signaling and plant interactions with the environment Mgr. Martin Černý, Ph.D. MENDEL UNIVERSITY IN BRNO Faculty of AgriSciences Department of Molecular Biology and Radiobiology HABILITATION THESIS Study field: Biochemistry Brno 2021 Děkuji všem, kteří se přímo i nepřímo zasloužili o tuto práci. Mé rodině a přátelům za podporu a trpělivost. Těm, kteří se mnou spolupracovali a těm, co ve spolupráci pokračovali a pokračují i přes řadu experimentů, které nevedly k očekávaným cílům. V neposlední řadě patří poděkování prof. Břetislavu Brzobohatému, bez kterého by tato práce nevznikla. Contents 1. Introduction ....................................................................................................................... 1 2. Fractionation techniques to increase plant proteome coverage ......................................... 4 2.1. Tissue separation ........................................................................................................ 5 2.2. Subcellular plant proteome ......................................................................................... 7 2.3. Separations at the protein level ................................................................................... 9 2.4. Separation at the peptide level .................................................................................. 11 2.5. Comparison of fractionation techniques .................................................................. -
Catabolism and Biotechnological Applications of Cholesterol Degrading Bacteria
bs_bs_banner Microbial Biotechnology (2012) 5(6), 679–699 doi:10.1111/j.1751-7915.2012.00331.x Minireview Catabolism and biotechnological applications of cholesterol degrading bacteria J. L. García,* I. Uhía and B. Galán according to its physiological relevance, an imbalance in Environmental Biology Department, Centro de its blood level causes serious diseases in humans. Investigaciones Biológicas, CSIC, C/ Ramiro de Maeztu, Cholesterol is frequently found in the biosphere, not 9, 28040 Madrid, Spain. only because of its natural abundance, but also due to its high resistance to microbial degradation. Cholesterol is a recalcitrant molecule to biodegradation because of its low Summary number of functional groups (one CC double bond and Cholesterol is a steroid commonly found in nature a single hydroxyl group), its low solubility in water with a great relevance in biology, medicine and chem- (3 ¥ 10-8 M) and its complex spatial conformation consti- istry, playing an essential role as a structural compo- tuted by four alicyclic rings and two quaternary carbon nent of animal cell membranes. The ubiquity of atoms. The high hydrophobicity and low volatility of cho- cholesterol in the environment has made it a refer- lesterol leads to a high absorption to solid phases. ence biomarker for environmental pollution analysis Because of their high rate of persistence, cholesterol and and a common carbon source for different microor- some derived compounds, such as coprostanol, have ganisms, some of them being important pathogens been used as reference biomarkers for environmental such as Mycobacterium tuberculosis. This work pollution analysis (Veiga et al., 2005). revises the accumulated biochemical and genetic Steroids, some of them derived from cholesterol, con- knowledge on the bacterial pathways that degrade or stitute a new class of pollutants discharged into the envi- transform this molecule, given that the characteriza- ronment as a result of human activity (Gagné et al., 2006). -
By Gunther Hirschfelder, Manuel Trummer There Is Scarcely An
by Gunther Hirschfelder, Manuel Trummer There is scarcely an aspect of daily cultural practice which illustrates the processes of transformation in European culture as clearly as daily nutrition. Indeed, securing the latter was essential for the daily fight for survival right up to the mid-19th century, with large sections of the population frequently being confronted with harvest failures and food shortages resulting from wars, extreme weather, pests, fire, changes in the agrarian order, and population growth. Consequently, food and drink were central both in daily life and in the celebration of feasts, and provided an opportunity for social differentiation. The hope for better nutrition was the pri- mary impetus for many migration processes and a canvas onto which desires were projected. The "Land of Cockaigne" motif, which can be traced from the Frenchman Fabliau de Coquaignes in the 13th century to Erich Kästner's (1899–1974) children's book "Der 35. Mai oder Konrad reitet in die Südsee" (1931), is a classic example of this. TABLE OF CONTENTS 1. Introduction 2. The End of Medieval Cuisine? 3. Consumption and Innovation at the Beginning of the Modern Period – Rice, Buckwheat, and Meat 4. Early Internationalisation and Innovations in the 17th and 18th Centuries – Potatoes, Maize and Hot Drinks 5. The 19th Century – Urbanisation and the Food Industry 6. Conclusion: 1900–1950 7. Appendix 1. Sources 2. Literature 3. Notes Indices Citation Daily nutrition1 has in the past been dependent on many exogenous factors, and remains so.2 Individual preferences have only be- gun to play a more significant role in nutrition since the second half of the 20th century. -
UNIVERSITY of CALIFORNIA, SAN DIEGO Biochemical Kinds And
UNIVERSITY OF CALIFORNIA, SAN DIEGO Biochemical Kinds and Selective Naturalism A dissertation submitted in partial satisfaction of the requirements for the degree Doctor of Philosophy in Philosophy (Science Studies) by Joyce Catherine Havstad Committee in charge: Professor William Bechtel, Chair Professor Craig Callender Professor Nancy Cartwright Professor Cathy Gere Professor James Griesemer 2014 © Joyce Catherine Havstad, 2014 All rights reserved. The Dissertation of Joyce Catherine Havstad is approved, and it is acceptable in quality and form for publication on microfilm and electronically: __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ Chair University of California, San Diego 2014 iii DEDICATION for my parents iv TABLE OF CONTENTS Signature Page…………………………………………………………………….. iii Dedication…………………………………………………………………………. iv Table of Contents………………………………………………………………….. v List of Figures……………………………………………………………………... viii Vita………………………………………………………………………………… x Abstract of the Dissertation………………………………………………………... xi Introduction………………………………………………………………………... 1 References……………………………………………………………………... 7 Chapter 1: Messy Chemical Kinds………………………………………………… 8 Section 1: Introduction………………………………………………………… 8 Section 2: Microstructuralism about Chemical Kinds…………………………. -
TC İSTANBUL Üniversitesi ( DOKTORA Tezi )
T.C. İSTANBUL ÜNiVERSiTESi SAGLIK BiLiMLERİ ENSTİTÜSÜ ( DOKTORA TEZi ) 1933 ÜNİVERSİTE REFORMU İLE BİRLİKTE TÜRKİYE'YE GELEN YABANCI BİYOKİMYA HOCALARı VE KATKILARI i -- -- --- ŞÜKRÜARAS DANIŞMAN DOÇ. DR. GÜL TEN DİNÇ TIP TARİHİ VE ETİK ANABiLiM DALI DEONTOLOJİ VE TIP TARİHİ PROGRAMI İSTANBUL-2012 ii TEZ ONAYI Aşağıda tanıtımı yapılan tez. jüri tarafından başarılı bulunarak Doktora Tezi olarak kabul edilmiştir. d { n vw 13/06 /2012 Prof. Dr. Nevin Yalınan Enstitü Müdürü)'- Kurum : İstanbul Üniversitesi Sağlık Bilimleri Enstitüsü Program Adı : Deontoloji ve Tıp Tarihi Doktora Programı, Programın Seviyesi: Yüksek Lisans () Doktora ( X ) Anabilim Dalı :Tıp Tarihi ve Etik Tez Sahibi : Şükrü Aras Tez Başlığı : l 933 Üniversite Reformu ile birlikte Türkiye'ye gelen yabancı biyokimya hocaları ve katkı ları Sınav Yeri : İ.Ü. Cerrahpaşa Tıp Fakültesi. Tıp Tarihi ve Etik Anabilim Dalı Sınav Tarihi : l 3.06.20 l 2 Tez Sınav Jürisi \. Doç. Dr. Gülten Dinç (Tez Danışmanı), İstanb~l Üniversitesi. Cerrahpaşa Tıp Fakültesi. Tıp Tarihi ve Etik Anabilim Dalı. j·.J ~~ \ 2. Prof. Dr. Nuran Yıldırım (Tez İzleme Komitesi Üyesi), İstanbul Üniversitesi. İstanbul Tıp Fakültesi. Tıp Tarihi ve Etik Anabilim Dalı. ,X._LGUı \ 3. Prof. Dr. Emre Dölen (Tez İzleme Komitesi Üyesi), Marmara Üniversitesi. Eczacılık Fakültesi. ali ik Kimya Anabilim Dalı. yten Altıntaş, İstanbul Üniversitesi. Cerrahpaşa Tıp Fakültesi. Tıp Tarihi ve Etik Anabilim Dalı. ~-- ~~--j -- 'j .. .. S. Doç. Dr. Yeşim lşıl Ulman. Acıbadem Universitesi. Tıp Fakültesi. Tıp Tarihi ve Etik Anabili~alı. iii BEYAN Bu tez çalışmasının kendi çalışınam olduğunu, tezin planlanmasından yazımına kadar bütün safhalarda etik dışı davranışıının olmadığını, bu tezdeki bütün bilgileri akademik ve etik kurallar içinde elde ettiğimi, bu tez çalışmayla elde edilmeyen bütün bilgi ve yorumlara kaynak gösterdiğimi ve bu kaynakları da kaynaklar listesine aldığımı, yine bu tezin çalışılması ve yazımı sırasında patent ve telif hakiarım ihlal edici bir davranışıının olmadığı beyan ederim. -
De Geschiedenis Van De Scheikunde in Nederland. Deel 1
De geschiedenis van de scheikunde in Nederland. Deel 1 Van alchemie tot chemie en chemische industrie rond 1900 H.A.M. Snelders bron H.A.M. Snelders, De geschiedenis van de scheikunde in Nederland. Deel 1: Van alchemie tot chemie en chemische industrie rond 1900. Delftse Universitaire Pers, Delft 1993 Zie voor verantwoording: http://www.dbnl.org/tekst/snel016gesc01_01/colofon.htm © 2008 dbnl / H.A.M. Snelders II ‘De scheider’, van Jan Luyken (Het menselijk bedrijf Amsterdam, 1694) H.A.M. Snelders, De geschiedenis van de scheikunde in Nederland. Deel 1 vii Ten geleide We schrijven 1992. In onze complexe samenleving staat de scheikunde er niet goed op. ‘Het vak scheikunde is uit de gratie’ schrijft een bekende journalist. ‘Om eerlijk te zijn heb ik in het verleden wel eens verteld dat ik Frans studeerde’ zegt een scheikundig student, om vragen te voorkomen. In 1993 bestaat de Koninklijke Nederlandse Chemische Vereniging, KNCV, negentig jaar. Er zijn in Nederland sinds het vak tot ontwikkeling kwam zeer belangrijke prestaties op scheikundig gebied verricht. Er zijn perioden geweest waarin er voor deze prestaties een brede waardering bestond, dit was misschien het sterkst het geval in de jaren vijftig-zestig van onze eeuw. In de tegenwoordige tijd bestaat ten aanzien van de scheikunde en al het chemisch handelen veelal een sfeer van wantrouwen. In brede kring wordt gedacht dat de scheikunde, de scheikundigen, veroorzakers van, vooral milieugerelateerde, problemen zijn. Er wordt daarbij vergeten dat dezelfde mensen die ervan worden verdacht de veroorzakers van deze problemen te zijn in hoge mate er toe bijdragen dat (milieu)problemen kunnen worden voorkómen, opgespoord en opgelost. -
6B. Earth Sciences, Astronomy & Biology
19-th Century ROMANTIC AGE Astronomy, Biology, Earth sciences Collected and edited by Prof. Zvi Kam, Weizmann Institute, Israel The 19th century, the Romantic era. Why romantic? Borrowed from the arts and music, but influenced also the approach to nature and its studies: emphasizing descriptive biology and classification of animals and plants. ASTRONOMY and EARTH SCIENCES EARTH SCIENCES AGE OF THE UNIVERSE AND OF EARTH How can we measure the age of the universe? The size of the universe? The size and distances of stars? How can we estimate the age of earth? How were the various chemical elements created? Characteristic of the 19th century is the transition from geology of stone collecting and sorting, to attempts on modeling the mechanisms shaping the earth crust. The release from religious constraints provided space for testing new theories based on fossils, distributions of rock and soil types, earthquakes, volcanic eruptions, soil erosion and sediment, glaciers and their traces, sea floors, earth core etc. Before the 19th century, a reminder: 1650 James Ussher, 1581-1656, an Irish archbishop, claim earth was created 4000 BC, before the first day of creation. 1715 Edmond Halley, 1656-1742, Calculated an estimation of earth age from seawater salinity. He assumed the ancient see contained sweet water, and salinity rose due to earth erosion. 1785 Dr. James Parkinson, 1755-1824, a surgeon (who identified what was later called “Parkinson disease”) and a geologist, one of the founders of the geological society and a supporter of “catastrophism”. Saved the nature museum in Leicester square from bankruptcy of his owner, Sir Ashton Lever. -
Some Milestones in History of Science About 10,000 Bce, Wolves Were Probably Domesticated
Some Milestones in History of Science About 10,000 bce, wolves were probably domesticated. By 9000 bce, sheep were probably domesticated in the Middle East. About 7000 bce, there was probably an hallucinagenic mushroom, or 'soma,' cult in the Tassili-n- Ajjer Plateau in the Sahara (McKenna 1992:98-137). By 7000 bce, wheat was domesticated in Mesopotamia. The intoxicating effect of leaven on cereal dough and of warm places on sweet fruits and honey was noticed before men could write. By 6500 bce, goats were domesticated. "These herd animals only gradually revealed their full utility-- sheep developing their woolly fleece over time during the Neolithic, and goats and cows awaiting the spread of lactose tolerance among adult humans and the invention of more digestible dairy products like yogurt and cheese" (O'Connell 2002:19). Between 6250 and 5400 bce at Çatal Hüyük, Turkey, maces, weapons used exclusively against human beings, were being assembled. Also, found were baked clay sling balls, likely a shepherd's weapon of choice (O'Connell 2002:25). About 5500 bce, there was a "sudden proliferation of walled communities" (O'Connell 2002:27). About 4800 bce, there is evidence of astronomical calendar stones on the Nabta plateau, near the Sudanese border in Egypt. A parade of six megaliths mark the position where Sirius, the bright 'Morning Star,' would have risen at the spring solstice. Nearby are other aligned megaliths and a stone circle, perhaps from somewhat later. About 4000 bce, horses were being ridden on the Eurasian steppe by the people of the Sredni Stog culture (Anthony et al. -
Cholesterol Degradation: a Promising Novel Drug Target Against Tuberculosis
Cholesterol degradation: a promising novel drug target against Tuberculosis Pieter Blom S2394715 June 2016 Supervisor: A. M. W. H. Thunnissen (Protein crystallography) Bachelor Thesis 1 Abstract One third of the world population is infected by Mycobacterium tuberculosis. Although for most patients, the disease is in its latent phase, this still poses a major threat for global health. Especially as drug resistant strains of this bacterium arise, effectively treating tuberculosis becomes increasingly difficult. New drugs against tuberculosis are constantly being developed, but the pipeline may be too narrow and multiple strategies have to be invoked to keep ahead of this disease. Alongside improvement of existing drugs and high throughput screening, target based drug design is one of the viable strategies. An interesting target is the cholesterol catabolism of Mtb as intervention in this pathway results in both accumulation of toxic intermediates and deprivation from an important energy and carbon source. Therefore successful inhibition of one or several of the key enzymes for this pathway, may be a decent way to combat Mtb. All known enzymes are discussed in this thesis on their potential to become a viable drug target, and for what enzymes further characterisation is necessary. Although not the entire pathway has yet been fully understood, several candidate enzymes for drug development arise, and their inhibitors may be leads for future clinical trials. 2 Table of contents Abstract .................................................................................................................................................. -
32 H.A.M. Snelders* DE SCHEI- EN
32 Tsch.Gesch.Gnk.Natuurw.Wisk.Techn. 7(1984) 1 Themanummer H.A.M. Snelders* DE SCHEI- EN NATUURKUNDE AAN DE UTRECHTSE UNIVERSITEIT IN DE NEGENTIENDE EEUW Inleiding Voor de inlijving van ons land bij het Franse keizerrijk in 1810, hadden de universiteiten (Leiden 1575; Franeker 1585; Groningen 1614; Utrecht 1636) geen afzonderlijke faculteit voor de wis- en natuurkundige wetenschappen. Deze waren ondergebracht in de medische en in de filosofische faculteit. In de laatste werden zowel de humaniora als de natuurwetenschappen onder- wezen. Het chemisch-farmaceutische en botanische onderwijs werd verzorgd door medici uit de medische faculteit en was vooral afgestemd op de behoefte van de medische studenten. De hoognodige vernieuwingen in de studie van deze vakken bleven daardoor grotendeels uit. Chemie en botanic werden beschouwd als vakken voor de medische propaedeuse, hetgeen onderwijs en onderzoek daarin niet bepaald stimuleerde. Ook de wiskunde en natuurkunde (in de moderne betekenis van het woord) hadden nauwelijks een vaste plaats in het studieprogramma verworven. Het feit dat er voor een fysicus, chemicus of botanicus vrijwel geen beroepsmogelijkheden beston- den, werkte uiteraard belemmerend voor het instellen van een zelfstandige studie van deze disciplines. Bij de omzetting van de Utrechtse hogeschool in een 'ecole secondaire' (22 oktober 1811) gaf de Haarlemse arts Nicolaas Cornelis de Fremery (1770- 1844) scheikunde in de filosofische en in de medische faculteit. Hij was in 1795 benoemd tot "medicinae, chemiae, artis pharmaceuticae et historiae naturalis professor". In de filosofische faculteit doceerde sinds 1755 Johan nes Theodorus Rossijn (1744-1817) filosofie, fysica en metafysica. Hij werd in 1812 opgevolgd door Gerrit Moll (1785-1838) als hoogleraar in wiskunde, natuurkunde en astronomic.' Deze situatie veranderde met het "Besluit, waarbij de organisatie van het Hooger-Onderwijs in de Noordelijke Provincien wordt vastgesteld"^ van 2 *Instituut voor Geschiedenis der Natuurwetenschappen, RU Utrecht, Janskerkhof 30, 3512 BN Utrecht.