are released into the bloodstream some of these, such as the protein myoglobin , are harmful to the kidney ... as tea colored , due to the presence of myoglobin . Damage to the kidneys may give rise to oliguria ... Mechanism Image Myoglobin.png upright thumb Schematic diagram of myoglobin , a heme containing protein .... alt Structural drawing of the myoglobin molecule Damage to skeletal muscle may take various ... ions, the heme containing protein myoglobin , the enzyme creatine kinase and uric acid a breakdown ... is the accumulation of myoglobin in the Nephron Renal tubule kidney tubules . ref name Bosch ref name Vanholder2000 ref name Elsayed Normally, the blood protein haptoglobin binds circulating myoglobin and other heme containing substances, but in rhabdomyolysis the quantity of myoglobin exceeds the binding capacity of haptoglobin. ref name Elsayed Myoglobinuria , the presence of myoglobin in the urine ... more water from the wikt filtrate filtrate , myoglobin interacts with Tamm Horsfall protein Tamm ... Myoglobin has a short half life, and is therefore less useful as a diagnostic test in the later stages ... impairment. ref name Brancaccio2010 Despite this, use of urine myoglobin measurement is not supported ... L, El Sharif A title Utility of urine myoglobin for the prediction of acute renal failure in patients ... of the urine this occurs because the reagent on the test strip reacts with myoglobin. ref name Vanholder2000 ... the deposition of myoglobin in the kidneys. ref name Vanholder2000 Amounts of 6 to 12 ... urine production and may prevent myoglobin deposition in the kidney, has not been directly studied ... is more effective at removing large molecules from the bloodstream, such as myoglobin, ref name ... 1412 5 pmc 1679829 pmid 2279155 doi 10.1136 bmj.301.6766.1412 ref Myoglobin was demonstrated in the urine ... who had hemoglobinuria hemoglobin rather than myoglobin being the cause of the kidney damage . In 1944 Bywaters demonstrated experimentally that the renal failure was mainly caused by myoglobin ... more details
effects on cysteine ligation in the proximal His93Cys variant of horse heart myoglobin. Biocchemistry ... heart myoglobin. J. Am. Chem. Soc. 118 51 12909 12915. Maurus, R., Overall, C.M., Bogumil, R., Luo, Y., Mauk, A.G., Smith, M., and Brayer, G.D. 1997 . Thermal stabilization of horse heart myoglobin ... more details
of the oxygen binding protein myoglobin . These fibers are suited for endurance and are slow ... of myoglobin and a reliance on glycolytic enzymes. These fibers are efficient for short bursts ... color, which is a reflection of myoglobin content. Red Fibers Those containing high levels of myoglobin and oxygen storing proteins had a red appearance. Red muscle fibers tend to have more ... of myoglobin that gives them a red pigmentation. They have been demonstrated to have high concentration .... Slow oxidative also called slow twitch or fatigue resistant fibers . Contain Large amounts of myoglobin ... amounts of myoglobin. Many mitochondria. Many blood capillaries. Large amount of glycogen. High ... called fast twitch B or fatigable fibers . Contain Low myoglobin content. Few mitochondria. Few blood ... more details
. Myoglobin Mb low specificity for myocardial infarction 2 hours Myoglobin is used less than the other markers. Myoglobin is the primary oxygen carrying pigment of muscle tissue. It is high when muscle ... myoglobin, creatine kinase MB, and clinical variables. TAMI 7 Study Group. Thrombolysis and Angioplasty ... more details
is believed to be the release into the bloodstream of muscle breakdown products notably myoglobin ..., but may be due partly to nephrotoxicity nephrotoxic metabolite s of myoglobin. Seigo Minami ... releases potassium , myoglobin , phosphate , thromboplastin , creatine and creatine kinase . Compartment ... sodium bicarbonate to keep the urine pH at 6.5 or greater, to prevent myoglobin and uric acid deposition ... more details
Blood plasma Serum iron is a medicine medical laboratory test that measures the amount of circulating iron that is bound to transferrin . Clinicians order this laboratory test when they are concerned about Iron deficiency medicine iron deficiency , which can cause anemia and other problems. 65 of the iron in the body is bound up in hemoglobin molecules in red blood cell s. About 4 is bound up in myoglobin molecules. Around 30 of the iron in the body is stored as ferritin or hemosiderin in the spleen , the bone marrow and the liver . Small amounts of iron can be found in other molecules in cells throughout the body. None of this iron is directly accessible by testing the serum. However, some iron is circulating in the serum. Transferrin is a molecule produced by the liver that binds one or two iron III ions , i.e. ferric iron, Fe3 transferrin is essential if stored iron is to be moved and used. Most of the time, about 30 of the available sites on the transferrin molecule are filled. The test for serum iron uses blood drawn from vein s to measure the iron molecules that are bound to transferrin, and circulating in the blood. The extent to which sites on transferrin molecules are filled by iron ions can be another helpful clinical indicator, known as percent transferrin saturation . Another lab test saturates the sample to measure the total amount of transferrin this test is called total iron binding capacity TIBC . These three tests are generally done at the same time, and taken together are an important part of the diagnostic process for conditions such as anemia , iron deficiency anemia , anemia of chronic disease and Haemochromatosis . Normal values Normal reference ranges for blood tests reference ranges are Serum Iron SI ref name uimc http uimc.discoveryhospital.com main.php?t enc&id 1456 Serum Iron . University of Illinois Medical Center. Accessed July 6, 2006. ref Men 65 to 176 g dL Women 50 to 170 g dL Newborns 100 to 250 g dL Children 50 to 120 g dL Total ... more details
Hydrophobic collapse is a hypothesized event that occurs during the protein folding folding process of globular protein s, suggested on the basis of the observation that proteins native state s often contain a hydrophobic core of nonpolar amino acid side chain s interspersed with charged side chains that are neutralized by Salt bridge protein and supramolecular salt bridge s in the protein s interior, leaving most of the polar or charged residues on the solvent exposed protein surface. The energetic stabilization conferred on the protein by the sequestration of the hydrophobic side chains from the surrounding water is thought to stabilize folding intermediates. The hypothesis generally posits that hydrophobic collapse is relatively early event in the folding pathway, occurring before the formation of many secondary structure s and native contact s present in the fully folded tertiary structure . The collapsed intermediate is also referred to as a molten globule and corresponds to a partially folded state whose energy is lower than that of the denaturation biochemistry denatured state but higher than that of the native state that is, within the energy well of the folding funnel but not yet close to the energy minimum. Partial hydrophobic collapse is an experimentally accepted model for the folding Protein folding kinetics of many globular proteins, such as myoglobin , ref Gilmanshin R, Dyer RB, Callender RH. 1997 . Structural heterogeneity of the various forms of apomyoglobin implications for protein folding. Protein Science 6 10 2134 42. ref alpha lactalbumin , ref Arai M, Kuwajima K. 1996 . Rapid formation of a molten globule intermediate in refolding of alpha lactalbumin. Fold Des 1 4 275 87. ref barstar , ref Agashe VR, Shastry MC, Udgaonkar JB. 1995 . Initial hydrophobic collapse in the folding of barstar. Nature 377 6551 754 7. ref and staphylococcus staphylococcal nuclease . ref Vidugiris GJ, Markley JL, Royer CA. 1995 . Evidence for a molten globule like tran ... more details
Image Troponino.svg thumb 400px Troponin Troponin I is a part of the troponin complex . It binds to actin in thin myofilaments to hold the actin tropomyosin complex in place. Because of it myosin cannot bind actin in relaxed muscle. When calcium binds to the Troponin C it causes conformational changes which lead to dislocation of troponin I and finally tropomyosin leaves the binding site for myosin on actin leading to contraction of muscle. The letter I is given due to its inhibitory character. The tissue specific subtypes are Slow twitch skeletal muscle isoform troponin I, TNNI1 1q31.3, OMIM2 191042 Fast twitch skeletal muscle isoform troponin I, TNNI2 11p15.5, OMIM2 191043 Cardiac troponin I, TNNI3 19q13.4, OMIM2 191044 cTnI Human troponin I is presented in cardiac muscle tissue by a single isoform with molecular weight 23876 Da and it consists of 209 amino acid residues. The theoretical pI of cTnI is 9.87. cTnI molecule contains two serines in the 22 and 23 positions. Both amino acid residues can be phosphorylated in vivo by protein kinase A, so four forms of protein one dephospho, two monophospho and one bisphospho can coexist in the cell. Phosphorylation of cTnI changes the conformation of the protein and modifies its interaction with other troponins as well as the interaction with anti TnI antibodies. According to the latest findings significant part of cTnI released into the patient s blood stream is phosphorylated. ref cite journal author Labugger R, Organ L, Collier C, Atar D, Van Eyk JE title Extensive troponin I and T modification detected in serum from patients with acute myocardial infarction journal Circulation. volume 102 issue 11 pages 1221 1226 year 2000 ref For more than 15 years cTnI has been known as a reliable marker of cardiac muscle tissue injury. It is considered to be more sensitive and significantly more specific in diagnosis of the myocardial infarction than the golden marker of last decades CKMB, as well as myoglobin and LDH isoenzymes. H ... more details
Use mdy dates date November 2011 Infobox scientist name Irving Geis image filename only image size alt caption birth date Birth date 1908 10 18 birth place New York City death date Death date and age 1997 07 22 1908 10 18 death place residence citizenship nationality American fields workplaces alma mater Georgia Institute of Technology br University of Pennsylvania br University of South Carolina doctoral advisor academic advisors doctoral students notable students known for Scientific illustration author abbrev bot author abbrev zoo influences influenced awards signature filename only signature alt footnotes spouse Irving Geis October 18, 1908 July 22, 1997 was an United States American artist who worked closely with biologists . Geis s hand drawn work depicts many structures of biological macromolecules, such as DNA and protein s, including the first crystal structure of sperm whale myoglobin . ref name artist cite journal last Dickerson first R. E. authorlink Richard E. Dickerson year 1997 title Irving Geis, Molecular artist, 1908 1997 journal Protein Science volume 6 issue 11 pages 2483 2484 doi 10.1002 pro.5560061126 ref Early life and education Geis was born in New York City , and lived in Anderson, South Carolina for a time. He studied architecture at Georgia Tech from 1925 to 1927, and went on to get a Bachelor of Fine Arts at the University of Pennsylvania in 1929. ref name artist ref name ibb cite web url http www.ibb.gatech.edu artist irving geis title Artist Irving Geis publisher Parker H. Petit Institute for Bioengineering & Bioscience accessdate 2011 07 10 ref From there he attended the University of South Carolina from 1932 to 1933, graduating with a degree in design and painting in the midst of the great depression . ref name artist Career Geis served as a coauthor and illustrator of many biochemical books that were written by Albert Lehninger and Richard E. Dickerson , as well as the book How to Lie with Statistics by Darrell Huff . ref cite news ur ... more details
Warmed over flavor is an unpleasant flavor which develops in cooked meat which is subsequently refrigerated prior to reheating. As cooking and subsequent refrigeration is the case with most convenience food s containing meat, it is a significant challenge to the Food processing processed food Food industry industry . The flavor is variously described as rancid, stale, like cardboard, and even compared to damp dog hair. ref name Frank Frank, Paula. Warmed over flavor a processing challenge. Refrigerated & Frozen Foods, 1 March 2003. ref Warmed over flavor is caused by the oxidation oxidative decomposition of lipids fatty substances in the meat into chemicals which have a displeasing taste or odor. This decomposition process begins after cooking or processing and is aided by the release of naturally occurring iron in the meat. ref name Frank Appearance of warmed over flavor The appearance of warmed over flavor begins as lipids, primarily lipids from the cell membrane of cells in the meat, are attacked by oxygen . This process is aided by the release of iron from iron containing proteins in the meat, including myoglobin and hemoglobin . The iron is released by the heat of cooking, or by mechanical grinding used to prepare products such as Spam food Spam . The free iron then acts as a catalyst , or promoter, of oxidation reactions. The reactions break down some of the fats in the meat to form primary oxidation products. These chemicals are not directly responsible for the objectionable taste. Instead, they subsequently further decompose to secondary oxidation products including alcohol s, acid s, ketone s, lactone s and unsaturated hydrocarbon s which produce the warmed over flavor . Many of these compounds, including pentanal , hexanal , pentylfuran , 2 pentylfuran , 2 octenal and 2,3 octanedione have a strong odor and can be tasted at concentrations as low as 1 part per billion. ref name Trout Cite doi 10.1021 jf00093a017 ref Prevention Warmed over flavor can be preve ... more details
including the muscle myoglobin , the non symbiotic plant hemoglobin and symbiotic plant leghemoglobin ..., myoglobin and their associated reductases journal J. Inorg. Biochem. volume 99 issue 1 pages 247 66 ... around 1.8 billion years ago served to provide the modern day analogue of hemoglobin myoglobin function for oxygen storage and transport. Gardner et al. 1998 suggested that the first hemoglobin myoglobin ... and transport functions of myoglobin hemoglobin appeared much later approximately 0.5 billion years .... Muscle Myoglobin This enzyme is much better equipped for oxygen storage, allowing more stable binding ... more details
Year nav topic 1957 science The year 1957 in science and technology involved some significant events, listed below. Astronomy and space exploration Image Sputnik 1.jpg left 120px thumb Sputnik 1 October 4 Launch of Sputnik 1 , the first artificial satellite . November 3 Launch of Sputnik 2 , with a dog called Laika on board, the first animal sent into orbit. There is no technology available to return it to earth. December 6 United States attempts launch of Vanguard TV3 which fails after just two seconds in the air. Nuclear pulse propulsion Project Orion begins, a U.S. program to build a spacecraft powered by nuclear explosions. Wilhelm Gliese publishes the first Gliese Catalogue of Nearby Stars . ref cite book title Katalog der Sterne n her ALS 20 Parsek f r 1950.0 last Gliese first W. publisher Astronomischen Rechen Institut location Heidelberg year 1957 bibcode 1957MiABA...8....1G ref Biology The structure of myoglobin is determined using x ray crystallography by John Kendrew and colleagues in England. ref cite journal title A Three Dimensional Model of the Myoglobin Molecule Obtained by X Ray Analysis author Kendrew, J. C. Bodo, g. Dintzis, H. M. Parrish, R. G. Wyckoff, H. Phillips, D. C. journal Nature journal Nature url http www.nature.com nature journal v181 n4610 pdf 181662a0.pdf year 1958 month March volume 181 issue 4610 pages 662 6 doi 10.1038 181662a0 pmid 13517261 bibcode 1958Natur.181..662K format PDF accessdate 2012 02 29 ref The Chlamydia trachomatis bacterium is first cultured in the yolk sacs of eggs by Feifan Tang and colleagues. ref cite journal author Darougar, S. Jones, B. R. Kinnison, J. R. Vaughan Jackson, J. D. Dunlop, E. M. title Chlamydial infection advances in the diagnostic isolation of Chlamydia, including TRIC agent, from the eye, genital tract, and rectum journal British Journal of Venereal Diseases year 1972 month December volume 48 issue 6 pages 416 420 cite journal author Tang, F. F. Chang, H. L. Huang, Y. T. Wang, K. C. title Studi ... more details
myoglobin , which is only found in human heart muscle. This indicated the feces contained the remains ... 10993075 ref Malar also found the myoglobin protein during a chemical analysis of a cooking pot at the ancient ... more details
. Mitochondria increase in both number and size and there are similar increases in myoglobin and oxidative ... ATP increase by 2.5 times in well trained endurance athletes ref name stoat In addition to SDH, myoglobin ... more details
File Niacin structure.svg thumb right 175px Niacin , essential to many types of life, is an example of a heterocyclic amine Heterocyclic amines , also sometime referred to as HCA s, are chemical compounds containing at least one heterocyclic ring, which by definition has atoms of at least two different elements, plus the compound has at least one amine group. While some heterocycles are amines themselves, the amines indicated in the name are those attached to the heterocyclic ring. The biological function of heterocyclic amines can range from those of vitamin s to carcinogen s. Carcinogenic heterocyclic amines are created by high temperature cooking of meat, for example. Five membered heterocyclic amines The compound pyrrolidine is composed of molecules that contain a saturated ring of five atoms. This cyclic structure is composed of one atom of nitrogen and four carbon. Nicotine is a molecule containing a pyrrolidine ring attached to a ring of pyridine other heterocyclic amine . Nicotine belongs to a group of compounds known as alkaloids, which are amines found in nature and produce physiological changes in animals. Pyrrole is another compound made up of molecules with a five membered heterocyclic ring. These molecules are unsaturated and contain a nitrogen atom in the ring. Four pyrrole rings are joined in a ring structure called a porphyrin . The rings of porphyrin are components of hemoglobin , myoglobin , vitamin B12 , chlorophyll and cytochromes . In the centers of heme in hemoglobin, myoglobin and cytochromes, iron is an ion, in the first two iron ion is bound to oxygen. Six membered heterocyclic amines The structure of pyridine is similar to that of benzene except that a nitrogen atom replaces one carbon atom. Pyridine is used as a flavoring agent. The pyridine ring is part of two B vitamins niacin and pyridoxine . Niacin, also called nicotinic acid, is found in most organisms. Via metabolism, it becomes nicotinamide adenine dinucleotide NAD, a coenzyme whic ... more details
anhydrase III and myoglobin in dermatological patients effects of isotretinoin treatment journal ... Dual label time resolved fluoroimmunoassay for simultaneous detection of myoglobin and carbonic ... more details
in two different strains of Flavobacterium and one strain of Pseudomonas . The myoglobin from abalone of Sulculus diversicolor has different structure compared with normal myoglobin but serves a similar function as myoglobin ability of bind oxygen reversibly. The molecular weight of Sulculus myoglobin ..., it does not share similar function with IDO. The IDO like myoglobin is unexpectedly widely ... evolution. The gene structure of Sulculus 42 kDa myoglobin is homologous with of human indoleamine .... firstly compared the tertiary structure of horse oxyhemoglobin and whale myoglobin . Then with higher resolution, Huber et al. found optimum relation between complete structures of sperm whale myoglobin ... more details
Dioxygen complexes are coordination compound s that contain O sub 2 sub as a ligand . ref Holleman, A. F. Wiberg, E. Inorganic Chemistry Academic Press San Diego, 2001. ISBN 0 12 352651 5. ref The study of these compounds is inspired by oxygen carrying proteins such as myoglobin , hemoglobin , hemerythrin , and hemocyanin . ref S. J. Lippard, J. M. Berg Principles of Bioinorganic Chemistry University Science Books Mill Valley, CA 1994. ISBN 0 935702 73 3. ref Several transition metal s form complexes with O sub 2 sub , and many of these complexes form reversibly. ref Berry, R. E. Reactivity and Structure of Complexes of Small Molecules Dioxygen , Comprehensive Coordination Chemistry II, 2004, 1, 625 629. ref The binding of O sub 2 sub is the first step in many important phenomena, such as cellular respiration , corrosion , and industrial chemistry. The first synthetic oxygen complex was demonstrated in 1938 with cobalt II complex reversibly bound O sub 2 sub . ref cite journal author Tokuichi Tsumaki title Nebenvalenzringverbindungen. IV. ber einige innerkomplexe Kobaltsalze der Salen ligand Oxyaldimine journal Bulletin of the Chemical Society of Japan year 1938 volume 13 pages 252 260 doi 10.1246 bcsj.13.252 ref Mononuclear complexes of O sub 2 sub O sub 2 sub binds to a single metal center either end on hapticity sup 1 sup or side on sup 2 sup . The bonding and structures of these compounds are usually evaluated by single crystal X ray crystallography , focusing both on the overall geometry as well as the O O distances, which reveals its bond order . Image TMdioxygenCmpx.png 220px center Complexes of sup 1 sup O sub 2 sub ligands O sub 2 sub adduct s derived from cobalt II and iron II porphyrin complexes and related anionic ligands exhibit this bonding mode. Myoglobin and hemoglobin are famous examples, and many synthetic analogues have been described that behave similarly. Binding of O sub 2 sub is usually described as proceeding via electron transfer from ... more details
Refimprove date December 2009 Cooperativity is a phenomenon displayed by enzyme s or receptor biochemistry receptor s that have multiple binding site s where the affinity of the binding sites for a ligand is increased, positive cooperativity, or decreased, negative cooperativity, upon the binding of a ligand to a binding site. For example the affinity of hemoglobin s four binding sites for oxygen is increased above that of the unbound hemoglobin when the first oxygen molecule binds. This is referred to as cooperative binding . ref name Whitford 2005 Whitford, David Proteins structure and function , 2005, John Wiley & Sons, pages 66 74 ref We also see cooperativity in large chain molecules made of many identical or nearly identical subunits such as DNA , protein s, and phospholipid s , when such molecules undergo phase transitions such as melting, unfolding or unwinding. This is referred to as subunit cooperativity. Cooperative binding When a substrate binds to one enzymatic subunit, the rest of the subunits are stimulated and become active. Ligands can either have non cooperativity, positive cooperativity or negative cooperativity. File Hb saturation curve.png thumb The sigmoidal shape of hemoglobin s oxygen dissociation curve results from cooperative binding of oxygen to hemoglobin. An example of positive cooperativity is the binding of oxygen to hemoglobin . One oxygen molecule can bind to the ferrous iron of a heme molecule in each of the four chains of a hemoglobin molecule. Deoxy hemoglobin has a relatively low affinity for oxygen , but when one molecule binds to a single heme, the oxygen affinity increases, allowing the second molecule to bind more easily, and the third and fourth even more easily. The oxygen affinity of 3 oxy hemoglobin is 300 times greater than that of deoxy hemoglobin. This behavior leads the affinity curve of hemoglobin to be sigmoid function sigmoidal , rather than hyperbolic function hyperbolic as with the monomeric myoglobin . By the sa ... more details
muscles and myoglobinuria . Myoglobinuria, the condition where myoglobin is present in urine ... volume, urine sediment and myoglobin levels would be ascertained. If rhabdomyolysis is suspected, serum myoglobin, creatine kinase, lactate dehydrogenase, electrolytes and renal function will be checked ... more details
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