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| | Proteins may help clean up pollutants and find cures for diseases |
 | | Another new concept that Shelnutt's research has revealed is that many hemes change shape and go from one distortion to another as they perform their work. | | | Shelnutt believes that his discovery might lead to changes in the way diseases are treated in the future or for other scientific advances. | | | Further, he's demonstrated that in many instances the heme's shape changes as it performs its job. |
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http://www.sandia.gov/media/protein.htm
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| | Environmental Chemical Exposures and Disturbances of Heme Synthesis |
| | Medical conditions that appear to have only secondary effects on the heme synthesis pathway are appropriately evaluated, with attention focused on the primary condition. | | | Accumulation or excessive excretion of heme precursors does not necessarily mean there is a deficiency of a heme pathway enzyme(s); other possible mechanisms exist. | | | As discussed in "Biochemistry of Porphyrias," when a porphyria (or another clinically important disturbance of heme synthesis, e.g., lead intoxication) of any recognized type is symptomatic, it is almost always accompanied by substantial overproduction and increased excretion of heme precursors, typically at least several-fold greater than the value reported for the upper limit of normal. |
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http://ehp.niehs.nih.gov/members/1997/Suppl-1/daniell-full.html
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| | When heme attacks: After trauma, the molecule that makes life possible rampages |
| | Studying the heme recycling system might prove useful in developing treatments for preventing the secondary damage set off by heme. | | | (Philadelphia, PA) — Heme, the iron-bearing, oxygen-carrying core of hemoglobin, makes it possible for blood to carry oxygen, but researchers from the University of Pennsylvania School of Medicine have determined how free-floating heme can also make traumatic events worse by damaging tissue. | | | "Following a heart attack, a stroke, or any really severe physical injury, heme is literally shaken loose from hemoglobin," said Xiang Dong Tang, MD, PhD, Staff Scientist in Penn's Department of Physiology. |
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http://www.eurekalert.org/pub_releases/2003-10/uopm-wha100103.php
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| | Heme - Wikipedia, the free encyclopedia |
| | There are three biologically important kinds of heme. | | | In humans, this pathway serves almost exclusively to form heme. | | | This mechanism is of therapeutic importance: infusion of heme arginate of hematin can abort attacks of porphyria in patients with an inborn error of metabolism of this process, by reducing transcription of ALA synthase. |
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http://en.wikipedia.org/wiki/Heme
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| | Iron, Heme and Porphyrin Metabolism |
| | In addition numerous cytochromes of the oxidative-phosphorylation pathway contain heme. | | | The iron can be stored within intestinal enterocytes bound to ferritin. | | | Some disorders of heme biosynthesis are more insidious such as the various |
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http://web.indstate.edu/thcme/mwking/heme-porphyrin.html
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| | Heme Synthesis |
| | of the heme synthesis pathway, and is usually rate-limiting for the overall pathway. | | | The heme, in addition to supplying needs, would repress transcription of the gene for ALA Synthase, which is rate-limiting for the pathway and the source of the excess ALA. | | | (ALA), arising from de-repression of ALA Synthase gene transcription when heme is deficient, is considered responsible for the neurological symptoms. |
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http://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb2/part1/heme.htm
(756 words)
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| | Re: The similar structure between Chlorophyll and Heme |
| | You have recognized heme (or haeme), a metalloprotein, as an important biochemical structure. | | | Interest in the structure of heme is the reason that myoglobin was the first protein whose structure was described and the finding of tertiary and quaternary structures. | | | Redox reactions and the biological transfer of electrons are essential for energy production in living organisms. |
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http://www.madsci.org/posts/archives/apr2000/956010537.Bc.r.html
(258 words)
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| | Heme and Iron |
| | The process begins in the mitochondria because one of the precursors is found only there. | | | Iron metabolism is shaped by iron's status as an essential nutrient for which there is no mechanism for excreting any excesses that may accumulate in the body. | | | Heme metabolism is an important metabolic process because many important proteins contain heme as a prosthetic group. |
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http://www-medlib.med.utah.edu/NetBiochem/hi.htm
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| | Heme Structure |
| | A prosthetic group is a tightly bound, specific non-polypeptide unit required for the biological function of some proteins. | | | Catalase functions by the oxydation of Iron within its heme group (see images below). | | | In catalase, heme functions as a prosthetic group. |
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http://crystal.uah.edu/~carter/enzyme/heme.htm
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| | [No title] |
| | A spacefill view (with the exception of the heme molecule) of the hemoglobin | | | Now the heme molecules have been colored by element. | | | Spacefill view of atoms that make up a single heme molecule. |
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http://www.umass.edu/microbio/chime/hemoglob/heme.htm
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| | Electron Transfer Chain |
| | Individual heme prosthetic groups may be separately designated as cytochromes, even if associated with the same protein. | | | Changes in light absorbance upon oxidation or reduction of the heme iron provide a basis for monitoring the redox state of the heme. | | | Note at right how heme a is held in place within the complex, between 2 transmembrane |
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http://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/redox.htm
(1331 words)
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| | Beef Information Centre |
| | Only some iron in food is absorbed well by the body. | | | The amount of iron that is actually absorbed by the body is more important than the total iron consumed when determining if you are getting enough. | | | For example, your body absorbs four times as much iron from a 90 gram serving of beef sirloin steak (cooked) than from a 175 mL (3/4 cup) serving of bran flakes. |
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http://www.beefinfo.org/bh_iron.cfm
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| | C&EN: LATEST NEWS - STAPH FAVORS HEME |
| | The work provides the first evidence that a microorganism can select a specific source of iron from a menu of choices, says Olaf Schneewind, the microbiology professor who led the team. | | | By using inductively coupled plasma-mass spectrometry to measure the isotope content of the bacterial cells, the researchers were able to discern that the bacteria take up most of their iron from heme. | | | Now, researchers at the University of Chicago have found that, during the initial phases of infection, S. |
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http://pubs.acs.org/cen/news/8237/8237notw5.html
(275 words)
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| | IngentaConnect Role of Heme-Hemopexin in Human T-Lymphocyte Proliferation |
| | Heme-hemopexin supports and stimulates proliferation of human acute T-lymphoblastic (MOLT-3) cells, suggesting the participation of heme in cell growth and division. | | | Growth was similar in defined minimal medium supplemented with either low concentrations of heme-hemopexin or iron-transferrin, and either of these complexes were about 80% as effective as a serum supplement. | | | MOLT-3 cells express approximately 58,000 hemopexin receptors per cell (apparent K d 20 n M), of which about 20% are on the cell surface. |
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http://www.ingentaconnect.com/content/ap/ex/1997/00000232/00000002/art03526
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| | 403 Forbidden |
| | You don't have permission to access /Heme on this server. |
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http://open-encyclopedia.com/Heme
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