Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

Hemerythrin - Wikipedia, the free encyclopedia Hemerythrin and myohemerythrin are essentially colorless when deoxygenated, but turn a violet-pink in the oxygenated state. Hemerythrin and myohemerythrin are often described according to oxidation and ligation states of the iron center: Hemerythrin typically exists as an homooctamer or heterooctamer composed of α- and β-type subunits of 13-14 kDa each, although some species have dimeric, trimeric and tetrameric hemerythrins. en.wikipedia.org /wiki/Hemerythrin   (548 words)

Hemerythrin Hemerythrin is a protein responsible for oxygen transportation in the marine invertebrate phyla of sipuniculids[?], priapulids[?], brachiopods, and in a single annelid worm, magelona[?]. Hemerythrin is not, as the name might suggest, a heme. The "heme" was at first applied to any oxygen-carrying proteins, such as hemoglobin, and when hemoglobin was analyzed, the heme structure was named for the iron-porphyrin cofactor in the transport protein (globin being a general term for a globular protein). www.ebroadcast.com.au /lookup/encyclopedia/he/Hemerythrin.html   (148 words)

Hemerythrin   (Site not responding. Last check: 2007-10-10) Hemerythrin is not as the name might a heme. The "heme" was at first applied any oxygen-carrying proteins such as hemoglobin and when hemoglobin was analyzed the structure was named for the iron-porphyrin cofactor the transport protein (globin being a general for a globular protein). Later after hemerythrin named it was discovered that not every protein has a heme prosthetic group. www.freeglossary.com /Hemerythrin   (134 words)

NationMaster.com - Encyclopedia: Hemerythrin   (Site not responding. Last check: 2007-10-10) In chemistry, an oligomer consists of a finite number of monomer units (oligo is Greek for a few), in contrast to a polymer which, at least in principle, consists of an infinite number of monomers. Structure of Heme b A haem or heme is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin. Hemerythrin and myohemerythrin are often described according to oxidation and ligation states of the iron center: Glutamate is the anion of glutamic acid. www.nationmaster.com /encyclopedia/Hemerythrin   (1198 words)

Phascolopsis Laboratory Exercise   (Site not responding. Last check: 2007-10-10) The color is due to the presence of the respiratory pigment hemerythrin in vessel-like coelomic channels in the tentacles. Hemerythrin in the tentacular coelom is oxygenated in the tentacles and the hemerythrocytes moved posteriorly by the ciliated and muscular peritoneum of the contractile vessel. In the trunk coelom oxygen is transferred from hemerythrocytes of the contractile vessel to hemerythrocytes of the trunk coelom for distribution to the tissues. www.lander.edu /rsfox/310phascoloLab.html   (4235 words)

MageJava Linkage   (Site not responding. Last check: 2007-10-10) This type of motif can be found in a number of different proteins; here you are looking at hemerythrin (from PDB file, 1HMO). Hemerythrin is a protein which functions in marine invertebrates (like mollusks) the way hemoglobin functions in humans: it binds oxygen and then transports it to where the organism needs it. @kinemage 1 @caption Calpha trace of the four-helix bundle of hemerythrin (seagreen). www.america-tomorrow.com /gmu/biochem/kinemages/file4.htm   (314 words)

Priapulida - Wikipedia, the free encyclopedia The nervous system, composed of a ring and a ventral cord, retains its primitive connection with the ectoderm. There are no specialized sense-organs or vascular or respiratory systems (hemerythrin is the protein responsible for oxygen transportation). There is a wide body-cavity, but as this has no connection with the renal or reproductive organs it cannot be regarded as a coelom, but probably is a blood-space or haemocoel. en.wikipedia.org /wiki/Priapulida   (398 words)

Hemerythrin   (Site not responding. Last check: 2007-10-10) Hemerythrin is a non-heme iron protein used by two phyla of marine invertebrates (sipunculids and brachiopods) for oxygen transfer and/or storage. The two iron atoms in hemerythrin are bound the imidazole rings of five histidine residues and the carboxylates of an aspartic acid and a glutamic acid. In some brachiopods though, hemerythrin shows cooperativity between the subunits, so it will interesting to see what parts of the protein structure give rise to that inter-subunit communication. faculty.washington.edu /stenkamp/hemeryt.html   (395 words)

Up-regulation of Neurohemerythrin Expression in the Central Nervous System of the Medicinal Leech, Hirudo medicinalis, ...   (Site not responding. Last check: 2007-10-10) This hemerythrin cDNA is 613 bp in length (Fig. The NH -terminal sequence obtained by Edman degradation is shown with a darker gray background, and the sequence obtained by ESI-MS-MS is shown in bold and underlined. Immunodetection of hemerythrin in the CNS of H. www.jbc.org /cgi/content/full/279/42/43828   (5122 words)

Structural studies of haemerythrin-like proteins   (Site not responding. Last check: 2007-10-10) Holmes, M.A. and Stenkamp, R.E. Structures of met and azidomet hemerythrin at 1.66 Å resolution. Stemmler, T.L., Sossong, T.M., Jr., Goldstein, J.I., Ash, D.E., Elgren, T.E., Kurtz, D.M., Jr., and Penner­Hahn, J.E. EXAFS comparison of the dimanganese core structures of manganese catalase, arginase, and manganese­substituted ribonucleotide reductase and hemerythrin. York, J.L., Millett, F.S. and Minor, L.B. Proton magnetic resonance study of the histidines in hemerythrin and chemical identification of the nonligand histidines. metallo.scripps.edu /PROMISE/HAEMERYTHRIN_REF.html   (936 words)

blood varieties Hemerythrin is an iron-containing proteinous pigment found in the blood of certain bottom-dwelling marine worms, including some nematodes and annelids, and brachiopods. Coboglobin blood would be colorless or slightly pink when oxygen-enriched, but dark yellow or deep amber in the veins. Organisms with these kinds of blood pigments thus would not be poisoned by the gas, as humans are.) A molecule of coboglobin loses its ability to reversibly bind oxygen in less than a day, compared with weeks in the case of human hemoglobin. www.daviddarling.info /encyclopedia/B/blood.html   (1569 words)

Prof. Bosnich - Chemistry Department - University of Chicago The respiratory protein, hemerythrin, contains two non-heme iron atoms and resembles a large class of di-iron proteins which activate dioxygen in various ways. The reversible uptake of dioxygen by hemerythrin is the inspiration for the present study. This involves the construction of bimetallic complexes which are capable of binding a substrate such as molecular oxygen to one metal and, upon binding, the substrate is reduced by two electrons, one from each metal as occurs in hemerythrin. chemistry.uchicago.edu /fac/bosnich.shtml   (561 words)

Hemerythrin   (Site not responding. Last check: 2007-10-10) Single Oxygenated Hemerythrin protein Trimeric Hemerythrin Protein Complex Hemerythrin is a protein responsible for oxygen transportation in the marine invertebrate phyla of sipuniculids, priapulids, brachiopods, and in a single annelid worm, magelona. When releasing the oxygen molecule, the mu-oxo bridge retrieves the hydrogen atom and returns to a hydroxyl group. Because of its size Hemorythrin is usually found in cells or "corpuscles" in the blood rather then free floating. hemerythrin.ask.dyndns.dk   (364 words)

Sample of Interesting Proteins Hemerythrin is used by - worms, cephalopods, crustaceans, and spiders - sipunculid worms - four phyla of marine invertebrates For thought - Unlike hemoglobin, hemerythrin is not poisoned by carbon monoxide (CO). Haemocyanins are copper-containing oxygen transport proteins found in the haemolymph of many invertebrates. www.stolaf.edu /people/hansonr/mo/sample.html   (742 words)

Problem Set II   (Site not responding. Last check: 2007-10-10) A schematic structure of the subunit of hemerythrin is shown in the figure on the right. -helical regions of hemerythrin, about every third or fourth amino acid residue is a hydrophobic one. Sketch a reasonable series of steps for the folding of hemerythrin from a random coil to the structure shown. cmgm.stanford.edu /biochem200/PS2.htm   (751 words)

OGI School of Science & Engineering A common feature of these enzymes appears to be the formation of an initial peroxo intermediate from the reduced enzyme. However, in the respiratory protein, hemerythrin, binding of dioxygen is accomplished by reduction to peroxide in a reaction that is readily reversible. In ribonucleotide reductase, peroxide is similarly formed but decomposes irreversibly to a ferryl intermediate that is capable of carrying out oxidative chemistry. www.ogi.edu /research/dsp_project.cfm?research_project_id=B363F32A-C9D6-F92A-D8318A59712E9C7B   (203 words)

Viscosity-dependent energy barriers and equilibrium conformational fluctuations in oxygen recombination with ...   (Site not responding. Last check: 2007-10-10) Viscosity-dependent energy barriers and equilibrium conformational fluctuations in oxygen recombination with hemerythrin -- Lavalette and Tetreau 177 (1): 97 -- FEBS Journal Viscosity-dependent energy barriers and equilibrium conformational fluctuations in oxygen recombination with hemerythrin hemerythrin undergoes a conformational change in the deoxy state. content.febsjournal.org /cgi/content/abstract/177/1/97   (522 words)

Hemoglobin - Wikipedia, the free encyclopedia Uses copper prosthetic group instead of iron heme groups and is blue in color when oxygenated. Hemerythrin: Some marine invertebrates and a few species of annelid use this iron containing non-heme protein to carry oxygen in their blood. Chlorocruorin: Found in many annelids, and is very similar to Erythrocruorin, but the heme group is significantly different in structure. en.wikipedia.org /wiki/Hemoglobin   (2745 words)

Dissociation and Auto-Oxidation of Hemerythrin Induced by SH-Modification: A Kinetic Study -- Fuseya et al. 105 (2): ...   (Site not responding. Last check: 2007-10-10) Dissociation and Auto-Oxidation of Hemerythrin Induced by SH-Modification: A Kinetic Study -- Fuseya et al. Dissociation and Auto-Oxidation of Hemerythrin Induced by SH-Modification: A Kinetic Study state of S. cumanense hemerythrin is necessary to prevent auto-oxidation. jb.oxfordjournals.org /cgi/content/abstract/105/2/293   (191 words)

NEL, Antibacterial properties of hemerythrin of the sand worm nereis diversicolor NEL, Antibacterial properties of hemerythrin of the sand worm nereis diversicolor OBJECTIVES: To investigate the immune defense of the annelid Nereis diversicolor and the key role of a oxygen-binding protein, the metalloprotein MPII animals were subjected to bacteria infection. No part may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or ortherwise, without prior written permission from the Editor-in-Chief. www.nel.edu /24_12/NEL241203A05_Deloffre.htm   (265 words)

EXAFS Comparison of the Dimanganese Core Structures of Manganese Catalase, Arginase, and Manganese-Substituted ... Arginase and Mn-substituted ribonucleotide reductase have symmetric nearest neighbor environments with low RMS deviation in bond length, while Mn catalase and Mn-substituted hemerythrin appear to have a larger RMS bond length deviation. 3d areas for Mn catalase and Mn-substituted hemerythrin are larger, suggesting that one or both of the Mn ions are five-coordinate in these proteins. The EXAFS spectra for Mn-substituted ribonucleotide reductase and arginase are nearly identical, with symmetric Mn-nearest neighbor environments and outer shell scattering consistent with a lower limit of one histidine per Mn core. pubs.acs.org /cgi-bin/abstract.cgi/bichaw/1997/36/i32/abs/bi9702795.html   (502 words)

hemerythrin - OneLook Dictionary Search Tip: Click on the first link on a line below to go directly to a page where "hemerythrin" is defined. hemerythrin : Merriam-Webster's Online Dictionary, 10th Edition [home, info] hemerythrin : Dorland's Illustrated Medical Dictionary [home, info] www.onelook.com /?w=hemerythrin   (85 words)

Oxygen Equilibrium of Brachiopod Lingula Hemerythrin -- Manwell 132 (3426): 550 -- Science   (Site not responding. Last check: 2007-10-10) Oxygen Equilibrium of Brachiopod Lingula Hemerythrin -- Manwell 132 (3426): 550 -- Science In contrast to hemerythrin from five different species of sipunculid distribution of hemerythrin and the function of respiratory www.sciencemag.org /cgi/content/abstract/132/3426/550   (176 words)

Richard Friesner The method has been extensively benchmarked against fully quantum chemical data for a series of peptides. We are currently applying the method to a variety of protein-active site modeling problems, including cytochrome P450, beta-lactamases, and penicillin-binding proteins, and reversible oxygen binding in hemerythrin. We have developed an automated methodology for constructing a polarizable force field for arbitrary organic molecules based on ab initio quantum chemical calculations. www.columbia.edu /cu/chemistry/fac-bios/friesner/faculty.html   (662 words)

Domains with CATH Code 1.20   (Site not responding. Last check: 2007-10-10) Oxygen Transport Hemerythrin (Oxy) Sipunculid Worm (Themiste dyscrita) Oxygen Transport Hemerythrin (Met) Sipunculid Worm (Themiste dyscrita) Oxygen Transport Hemerythrin (Adizomet) Sipunculid Worm (Themiste dyscrita) www.biochem.ucl.ac.uk /bsm/cathwheels/Disulphide/Dis.lis.spin.1.20.html   (926 words)

FORESST - Align a sequence to a HMM model 2ccy chain A, Four Helix Bundle (Hemerythrin (Met), subunit A) 2asr, Four Helix Bundle (Hemerythrin (Met), subunit A) 2hmq chain A, Four Helix Bundle (Hemerythrin (Met), subunit A) abs.cit.nih.gov /cgi-bin/foresst2/cgi/align.cgi?type=alpha   (352 words)

languagehat.com: ABRA CADABRA. Posted by: Chuck Welch at April 1, 2004 08:29 PM I just posted about the priapalids or "penis worms", whose blood used hemerythrin (lacks porphyrin) rather than hemoglobin to transport oxygen. Everything you want to know about exotic methods of oxygen transport is there. www.languagehat.com /archives/001243.php   (313 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.