NADPH-Dependent A-Oxidation of Unsaturated Fatty Acids With
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Revised Glossary for AQA GCSE Biology Student Book
Biology Glossary amino acids small molecules from which proteins are A built abiotic factor physical or non-living conditions amylase a digestive enzyme (carbohydrase) that that affect the distribution of a population in an breaks down starch ecosystem, such as light, temperature, soil pH anaerobic respiration respiration without using absorption the process by which soluble products oxygen of digestion move into the blood from the small intestine antibacterial chemicals chemicals produced by plants as a defence mechanism; the amount abstinence method of contraception whereby the produced will increase if the plant is under attack couple refrains from intercourse, particularly when an egg might be in the oviduct antibiotic e.g. penicillin; medicines that work inside the body to kill bacterial pathogens accommodation ability of the eyes to change focus antibody protein normally present in the body acid rain rain water which is made more acidic by or produced in response to an antigen, which it pollutant gases neutralises, thus producing an immune response active site the place on an enzyme where the antimicrobial resistance (AMR) an increasing substrate molecule binds problem in the twenty-first century whereby active transport in active transport, cells use energy bacteria have evolved to develop resistance against to transport substances through cell membranes antibiotics due to their overuse against a concentration gradient antiretroviral drugs drugs used to treat HIV adaptation features that organisms have to help infections; they -
Regulation of the Tyrosine Kinase Itk by the Peptidyl-Prolyl Isomerase Cyclophilin A
Regulation of the tyrosine kinase Itk by the peptidyl-prolyl isomerase cyclophilin A Kristine N. Brazin, Robert J. Mallis, D. Bruce Fulton, and Amy H. Andreotti* Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011 Edited by Owen N. Witte, University of California, Los Angeles, CA, and approved December 14, 2001 (received for review October 5, 2001) Interleukin-2 tyrosine kinase (Itk) is a nonreceptor protein tyrosine ulation of the cis and trans conformers. The majority of folded kinase of the Tec family that participates in the intracellular proteins for which three-dimensional structural information has signaling events leading to T cell activation. Tec family members been gathered contain trans prolyl imide bonds. The cis con- contain the conserved SH3, SH2, and catalytic domains common to formation occurs at a frequency of Ϸ6% in folded proteins (17), many kinase families, but they are distinguished by unique se- and a small subset of proteins are conformationally heteroge- quences outside of this region. The mechanism by which Itk and neous with respect to cis͞trans isomerization (18–21). Further- related Tec kinases are regulated is not well understood. Our more, the activation energy for interconversion between cis and studies indicate that Itk catalytic activity is inhibited by the peptidyl trans proline is high (Ϸ20 kcal͞mol) leading to slow intercon- prolyl isomerase activity of cyclophilin A (CypA). NMR structural version rates (22). This barrier is a rate-limiting step in protein studies combined with mutational analysis show that a proline- folding and may serve to kinetically isolate two functionally and dependent conformational switch within the Itk SH2 domain reg- conformationally distinct molecules. -
Chapter 7. "Coenzymes and Vitamins" Reading Assignment
Chapter 7. "Coenzymes and Vitamins" Reading Assignment: pp. 192-202, 207-208, 212-214 Problem Assignment: 3, 4, & 7 I. Introduction Many complex metabolic reactions cannot be carried out using only the chemical mechanisms available to the side-chains of the 20 standard amino acids. To perform these reactions, enzymes must rely on other chemical species known broadly as cofactors that bind to the active site and assist in the reaction mechanism. An enzyme lacking its cofactor is referred to as an apoenzyme whereas the enzyme with its cofactor is referred to as a holoenzyme. Cofactors are subdivided into essential ions and organic molecules known as coenzymes (Fig. 7.1). Essential ions, commonly metal ions, may participate in substrate binding or directly in the catalytic mechanism. Coenzymes typically act as group transfer agents, carrying electrons and chemical groups such as acyl groups, methyl groups, etc., depending on the coenzyme. Many of the coenzymes are derived from vitamins which are essential for metabolism, growth, and development. We will use this chapter to introduce all of the vitamins and coenzymes. In a few cases--NAD+, FAD, coenzyme A--the mechanisms of action will be covered. For the remainder of the water-soluble vitamins, discussion of function will be delayed until we encounter them in metabolism. We also will discuss the biochemistry of the fat-soluble vitamins here. II. Inorganic cation cofactors Many enzymes require metal cations for activity. Metal-activated enzymes require or are stimulated by cations such as K+, Ca2+, or Mg2+. Often the metal ion is not tightly bound and may even be carried into the active site attached to a substrate, as occurs in the case of kinases whose actual substrate is a magnesium-ATP complex. -
Enzymes Main Concepts: •Proteins Are Polymers Made up of Amino Acids
Biology 102 Karen Bledsoe, Instructor Notes http://www.wou.edu/~bledsoek/ Chapter 6, section 4 Topic: Enzymes Main concepts: • Proteins are polymers made up of amino acids. Enzymes are a category of proteins. • Enzymes are catalysts. They speed up the rate of a chemical reaction by reducing the activation energy, which is the energy needed to carry out the reaction. An example of a catalyst: if you put a lit match to a sugar cube, it’s hard to make the sugar catch fire. But if you rub a corner of the sugar cube with ash or charcoal, it catches more easily. The ash or charcoal acts as a catalyst. • Many important chemical reactions in living cells can happen spontaneously, but these reactions happen too rarely and too slowly to sustain life. Enzymes make the reactions happen more quickly and more often. • Some reactions happen too violently to support life. Sugar, when burned, released a lot of energy, but the energy is mostly heat. A rapid reaction like that would overheat our cells. Enzyme-controlled reactions can release energy from sugar in a way that captures most of the energy and loses less of the energy as heat, so that the energy is useful to the cell and does not overheat the cell. • The structure of enzymes allows them to carry out reactions. Each enzyme is shaped to carry out only one specific reaction. This is known as enzyme specificity. Amylase, for example, is an enzyme that breaks down starch into glucose. Amylase only breaks down starch; it does not break down any other molecule, nor does it build starch out of glucose. -
Phosphoglucose Isomerase (Pgi)
NIPRO ENZYMES PHOSPHOGLUCOSE ISOMERASE (PGI) [EC 5. 3. 1. 9] from Bacillus stearothermophilus D-Glucose 6-phosphate ↔ D-Fructose 6-phosphate SPECIFICATION State : Lyophilized Specific activity : more than 400 U/mg protein Contaminants : (as PGI activity = 100 %) Phosphofructokinase < 0.01 % 6-Phosphogluconate dehydrogenase < 0.01 % Phosphoglucomutase < 0.01 % NADPH oxidase < 0.01 % Glutathione reductase < 0.01 % PROPERTIES Molecular weight : ca. 200,000 Subunit molecular weight : ca. 54,000 Optimum pH : 9.0 - 10.0 (Fig. 1) pH stability : 6.0 - 10.5 (Fig. 2) Isoelectric point : 4.2 Thermal stability : No detectable decrease in activity up to 60 °C. (Fig. 3, 4) Michaelis constants : (95mM Tris-HCI buffer, pH 9.0, at 30 °C) Fructose 6-phospate 0.27 mM STORAGE Stable at -20 °C for at least one year NIPRO ENZYMES ASSAY Principle The change in absorbance is measured at 340nm according to the following reactions. Fructose 6-phosphate PGI Glucose 6-phosphate + G6PDH + Glucose 6-phosphate + NADP Gluconolactone 6-phosphate + NADPH + H Unit Definition One unit of activity is defined as the amount of PGI that forms 1 μmol of glucose 6-phosphate per minute at 30 °C. Solutions Ⅰ Buffer solution ; 100 mM Tris-HCl, pH 9.0 Ⅱ Fructose 6-phosphate (F6P) solution ; 100 mM (0.310 g F6P disodium salt/10 mL distilled water) + + Ⅲ NADP solution ; 22.5 mM (0.188 g NADP sodium salt∙4H2O/10 mL distilled water) Ⅳ Glucose-6-phosphate dehydrogenase (G6PDH) ; (from yeast, Roche Diagnostics K.K., No. 127 671) suspension in 3.2 M (NH4)2SO4 solution (10 mg/2 mL) approx. -
Inhibitor for Protein Disulfide‑Isomerase Family a Member 3
ONCOLOGY LETTERS 21: 28, 2021 Inhibitor for protein disulfide‑isomerase family A member 3 enhances the antiproliferative effect of inhibitor for mechanistic target of rapamycin in liver cancer: An in vitro study on combination treatment with everolimus and 16F16 YOHEI KANEYA1,2, HIDEYUKI TAKATA2, RYUICHI WADA1,3, SHOKO KURE1,3, KOUSUKE ISHINO1, MITSUHIRO KUDO1, RYOTA KONDO2, NOBUHIKO TANIAI4, RYUJI OHASHI1,3, HIROSHI YOSHIDA2 and ZENYA NAITO1,3 Departments of 1Integrated Diagnostic Pathology, and 2Gastrointestinal and Hepato‑Biliary‑Pancreatic Surgery, Nippon Medical School; 3Department of Diagnostic Pathology, Nippon Medical School Hospital, Tokyo 113‑8602; 4Department of Gastrointestinal and Hepato‑Biliary‑Pancreatic Surgery, Nippon Medical School Musashi Kosugi Hospital, Tokyo 211‑8533, Japan Received April 16, 2020; Accepted October 28, 2020 DOI: 10.3892/ol.2020.12289 Abstract. mTOR is involved in the proliferation of liver 90.2±10.8% by 16F16 but to 62.3±12.2% by combination treat‑ cancer. However, the clinical benefit of treatment with mTOR ment with Ev and 16F16. HuH‑6 cells were resistant to Ev, and inhibitors for liver cancer is controversial. Protein disulfide proliferation was reduced to 86.7±6.1% by Ev and 86.6±4.8% isomerase A member 3 (PDIA3) is a chaperone protein, and by 16F16. However, combination treatment suppressed prolif‑ it supports the assembly of mTOR complex 1 (mTORC1) and eration to 57.7±4.0%. Phosphorylation of S6K was reduced by stabilizes signaling. Inhibition of PDIA3 function by a small Ev in both Li‑7 and HuH‑6 cells. Phosphorylation of 4E‑BP1 molecule known as 16F16 may destabilize mTORC1 and was reduced by combination treatment in both Li‑7 and HuH‑6 enhance the effect of the mTOR inhibitor everolimus (Ev). -
Digestive Enzyme: Amylase
DIGESTIVE ENZYME: AMYLASE BACKGROUND Caution: Most animals begin their digestion in their mouths. Chewing breaks up Lugol’s solution is slightly large pieces of food and chemicals in the saliva begin breaking apart hazardous: molecules of starch. In this experiment we add saliva to crackers to • It should not be observe the how quickly this process begins to happen. handled by small children. Basic definitions: • It is dangerous if Amylase: an enzyme that breaks down starch into sugars. swallowed. Enzyme: a protein that speeds up a chemical reaction. • Participants should Chemical Indicator: a chemical that allows you to observe that a wear gloves. reaction has taken place. • Adults should place Starch: a complex arrangement of sugar molecules. the Lugol’s solution into a small dropper Starch is a long group of glucose (sugar) molecules bonded together. bottle for youth to Amylose is the starch form that’s found in crackers. In amylose, the use. sugar molecules form a structure that has small spaces in between the molecules of sugar. Lugol’s solution contains iodine molecules that fit Skills: tightly inside these small spaces. When the iodine molecules are inside • Observation, these small spaces between bonded sugar molecules, the iodine looks teamwork. blue-black in color. If the sugar molecules begin to break apart and release the iodine molecules, the indicator solution looks light brown- Grade Levels: Grades 4 - brown in color. 12 Amylase is the protein that breaks apart starch into sugars. Amylase is a • Time: 15 – 20 minutes chemical found in the saliva of many animals. Number of Youth: Materials for each test group: Any Lugol’s Solution (2%) in small dropper bottle 2 test tubes with lids : 25ml or 50 ml Supplies Needed: Small cup of water Materials for each test Crushed saltine cracker in zip lock bag group: 5-7 plastic cups: 3 oz. -
The Role of Phospholipase D (Pld) and Grb2 in Chemotaxis
THE ROLE OF PHOSPHOLIPASE D (PLD) AND GRB2 IN CHEMOTAXIS A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science By KATIE J. KNAPEK B.S., Indiana University of Pennyslvania, 2006 2008 Wright State University WRIGHT STATE UNIVERSITY SCHOOL OF GRADUATE STUDIES December 19, 2008 I HEREBY RECOMMEND THAT THE THESIS PREPARED UNDER MY SUPERVISON BY Katie J. Knapek ENTITLED The Role of Phospholipase D (PLD) and Grb2 in Chemotaxis BE ACCEPTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Science. _____________________________ Julian Gomez-Cambronero, Ph. D. Thesis Director _____________________________ Barbara Hull, Ph. D. Program Director Committee on Final Examination _______________________ Julian Gomez-Cambronero, Ph. D. _______________________ Nancy Bigley, Ph. D. _______________________ Mill Miller, Ph. D. ________________________ Joseph F. Thomas Jr., Ph. D. Dean, School of Graduate Studies ABSTRACT Knapek, Katie J. M.S., Department of Biological Sciences, Microbiology and Immunology Program, Wright State University, 2008. The Role of Phospholipase D (PLD) and Grb2 in Chemotaxis. Phospholipase D (PLD) is an enzyme that hydrolyzes phosphatidylcholine yielding choline and phosphatidic acid. PLD is activated by mitogens (lead to cell division) and motogens (leading to cell migration). PLD is known to contribute to cellular proliferation and deregulated expression of PLD has been implicated in several human cancers. PLD has been found to play a role in leukocyte chemotaxis and adhesion as studied through the formation of chemokine gradients. We have established a model of cell migration comprising three cell lines: macrophages RAW 264.7 and LR-5 (for innate defense), and fibroblast COS-7 cells (for wound healing). -
Deamidated Human Triosephosphate Isomerase Is a Promising Druggable Target
biomolecules Article Deamidated Human Triosephosphate Isomerase Is a Promising Druggable Target Sergio Enríquez-Flores 1,*, Luis Antonio Flores-López 1,2, Itzhel García-Torres 1, Ignacio de la Mora-de la Mora 1 , Nallely Cabrera 3, Pedro Gutiérrez-Castrellón 4 , Yoalli Martínez-Pérez 5 and Gabriel López-Velázquez 1,* 1 Grupo de Investigación en Biomoléculas y Salud Infantil, Laboratorio de EIMyT, Instituto Nacional de Pediatría, Secretaría de Salud, Mexico City 04530, Mexico; [email protected] (L.A.F.-L.); [email protected] (I.G.-T.); [email protected] (I.d.l.M.-d.l.M.) 2 CONACYT-Instituto Nacional de Pediatría, Secretaría de Salud, Mexico City 04530, Mexico 3 Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; [email protected] 4 Hospital General Dr. Manuel Gea González, Mexico City 14080, Mexico; [email protected] 5 Unidad de Investigación en Medicina Experimental, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; [email protected] * Correspondence: [email protected] (S.E.-F.); [email protected] (G.L.-V.); Tel.: +52-55-10840900 (G.L.-V.) Received: 9 June 2020; Accepted: 10 July 2020; Published: 15 July 2020 Abstract: Therapeutic strategies for the treatment of any severe disease are based on the discovery and validation of druggable targets. The human genome encodes only 600–1500 targets for small-molecule drugs, but posttranslational modifications lead to a considerably larger druggable proteome. The spontaneous conversion of asparagine (Asn) residues to aspartic acid or isoaspartic acid is a frequent modification in proteins as part of the process called deamidation. -
Enhancement in Phospholipase D Activity As a New Proposed Molecular Mechanism of Haloperidol-Induced Neurotoxicity
International Journal of Molecular Sciences Communication Enhancement in Phospholipase D Activity as a New Proposed Molecular Mechanism of Haloperidol-Induced Neurotoxicity Marek Krzystanek 1,*, Ewa Krzystanek 2 , Katarzyna Skałacka 3 and Artur Pałasz 4 1 Department and Clinic of Psychiatric Rehabilitation, Department of Psychiatry and Psychotherapy, Faculty of Medical Sciences, Medical School of Silesia in Katowice, Ziołowa 45/47, 40-635 Katowice, Poland 2 Department of Neurology, Faculty of Medical Sciences, Medical School of Silesia in Katowice, Medyków 14, 40-772 Katowice, Poland; [email protected] 3 Institute of Psychology, University of Opole, Kopernika 11A Street, 45-040 Opole, Poland; [email protected] 4 Department of Histology, Faculty of Medical Sciences, Medical School of Silesia in Katowice, Medyków 18, 40-752 Katowice, Poland; [email protected] * Correspondence: [email protected] or [email protected] Received: 19 November 2020; Accepted: 1 December 2020; Published: 4 December 2020 Abstract: Membrane phospholipase D (PLD) is associated with numerous neuronal functions, such as axonal growth, synaptogenesis, formation of secretory vesicles, neurodegeneration, and apoptosis. PLD acts mainly on phosphatidylcholine, from which phosphatidic acid (PA) and choline are formed. In turn, PA is a key element of the PLD-dependent secondary messenger system. Changes in PLD activity are associated with the mechanism of action of olanzapine, an atypical antipsychotic. The aim of the present study was to assess the effect of short-term administration of the first-generation antipsychotic drugs haloperidol, chlorpromazine, and fluphenazine on membrane PLD activity in the rat brain. Animals were sacrificed for a time equal to the half-life of the antipsychotic drug in the brain, then the membranes in which PLD activity was determined were isolated from the tissue. -
Protein Disulfide-Isomerase A3 Significantly Reduces Ischemia
Neurochemistry International 122 (2019) 19–30 Contents lists available at ScienceDirect Neurochemistry International journal homepage: www.elsevier.com/locate/neuint Protein disulfide-isomerase A3 significantly reduces ischemia-induced damage by reducing oxidative and endoplasmic reticulum stress T Dae Young Yooa,b,1, Su Bin Choc,1, Hyo Young Junga, Woosuk Kima, Kwon Young Leed, Jong Whi Kima, Seung Myung Moone,f, Moo-Ho Wong, Jung Hoon Choid, Yeo Sung Yoona, ∗ ∗∗ Dae Won Kimh, Soo Young Choic, , In Koo Hwanga, a Department of Anatomy and Cell Biology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul, 08826, South Korea b Department of Anatomy, College of Medicine, Soonchunhyang University, Cheonan, Chungcheongnam, 31151, South Korea c Department of Biomedical Sciences, Research Institute for Bioscience and Biotechnology, Hallym University, Chuncheon, 24252, South Korea d Department of Anatomy, College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon, 24341, South Korea e Department of Neurosurgery, Dongtan Sacred Heart Hospital, College of Medicine, Hallym University, Hwaseong, 18450, South Korea f Research Institute for Complementary & Alternative Medicine, Hallym University, Chuncheon, 24253, South Korea g Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, 24341, South Korea h Department of Biochemistry and Molecular Biology, Research Institute of Oral Sciences, College of Dentistry, Gangneung-Wonju -
Enzyme Preparations: Recommendations for Submission of Chemical and Technological Data for Food Additive Petitions and GRAS Notices
Contains Nonbinding Recommendations Guidance for Industry Enzyme Preparations: Recommendations for Submission of Chemical and Technological Data for Food Additive Petitions and GRAS Notices Additional copies are available from: Office of Food Additive Safety Division of Biotechnology and GRAS Notice Review, HFS-255 Center for Food Safety and Applied Nutrition Food and Drug Administration 5001 Campus Drive College Park, MD 20740 (Tel) 301-436-1200 http://www.fda.gov/FoodGuidances You may submit written comments regarding this guidance at any time. Submit written comments on the guidance to the Division of Dockets Management (HFA-305), Food and Drug Administration, 5630 Fishers Lane, rm. 1061, Rockville, MD 20852. All comments should be identified with the title of the guidance document. U.S. Department of Health and Human Services Food and Drug Administration Center for Food Safety and Applied Nutrition January 1993; Revised July 2010 Contains Nonbinding Recommendations Table of Contents I. Introduction II. Background III. Discussion A. Petitions for Enzyme Preparations B. GRAS Notices for Enzyme Preparations IV. Recommendations for Petition or GRAS Notice Preparation A. Identity B. Manufacturing Process C. Specifications for Identity and Purity D. Intended Technical Effects and Use E. Intake Estimate V. Additional Information A. Enzyme Preparations Used in Meat and Poultry Processing B. Enzyme Preparations Containing Allergenic Ingredients 2 Contains Nonbinding Recommendations Guidance for Industry1 Enzyme Preparations: Recommendations for Submission of Chemical and Technological Data for Food Additive Petitions and GRAS Notices This guidance represents the Food and Drug Administration’s current thinking on this topic. It does not create or confer any rights for or on any person and does not operate to bind FDA or the public.