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Bilirubin Inhibition of Heme Biosynthesis
Science, 1959The conversion of protoporphyrin and iron to heme is catalyzed by a soluble enzyme prepared from rat liver. This reaction is inhibited by bilirubin, and initial kinetic studies suggest that the inhibition is due in part to a competition between protoporphyrin and the bile pigment. Implications of this finding in hyperbilirubinemia are mentioned.
R F, LABBE, M R, ZASKE, R A, ALDRICH
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Heme biosynthesis and trafficking
Free Radical Biology and Medicine, 2018Heme is an essential cofactor involved in a plethora of vital functions. Heme is required to be in most subcellular compartments, but the way, in which it is transported from the mitochondria - its site of synthesis - to those compartments is poorly understood.
Jonathan Dietz +5 more
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JBIC Journal of Biological Inorganic Chemistry, 1997
Heme is a necessary component in a variety of oxygen-binding proteins and electron-transfer proteins, and as such it occupies a central role in cellular and organismal metabolism. With only rare exceptions, organisms that utilize heme possess the entire biosynthetic pathway to produce this tetrapyrrole compound.
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Heme is a necessary component in a variety of oxygen-binding proteins and electron-transfer proteins, and as such it occupies a central role in cellular and organismal metabolism. With only rare exceptions, organisms that utilize heme possess the entire biosynthetic pathway to produce this tetrapyrrole compound.
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Fumarate Reductase in the Control of Heme Biosynthesis
Science, 1966A drug-induced stimulation of heme biosynthesis in mouse liver was accompanied by altered fumarate metabolism. In liver homogenate, fumarate-1,4-C 14 was incorporated, via succinate and succinyl coenzyme A, into heme at an accelerated rate.
T, Kurumada, R F, Labbe
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Regulation of Heme Biosynthesis in Escherichia coli
Archives of Biochemistry and Biophysics, 1995Escherichia coli is an organism that synthesizes 5-aminolevulinate (ALA), the first committed compound of the heme biosynthetic pathway, from glutamate (C-5 pathway) as opposed to glycine and succinyl CoA (C-4 pathway). While regulation of the C-4 pathway is generally acknowledged to occur at the level of formation of ALA, the mode of regulation of the
S I, Woodard, H A, Dailey
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Schweizerische medizinische Wochenschrift, 1976
300--400 mg of heme is synthesized daily in the organism. Heme is the prosthetic groups of hemoglobulin, cytochromes and other hemoproteins. Major sites of heme synthesis are bone marrow and liver. At least 7 enzymes and intermediary products are involved in the sequence of reactions that lead from glycine and succinyl coenzyme A to heme. delta-Aminole-
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300--400 mg of heme is synthesized daily in the organism. Heme is the prosthetic groups of hemoglobulin, cytochromes and other hemoproteins. Major sites of heme synthesis are bone marrow and liver. At least 7 enzymes and intermediary products are involved in the sequence of reactions that lead from glycine and succinyl coenzyme A to heme. delta-Aminole-
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Disorders of Heme Biosynthesis
2006X-linked sideroblastic anemia is due to a deficiency of the erythroid form of the first enzyme in the heme biosynthetic pathway, 5-aminolevulinic acid synthase. Characteristics of the disease are variable, but typically include adult onset anemia, ineffective erythropoiesis with formation of ring sideroblasts, iron accumulation and pyridoxine ...
Norman G. Egger +2 more
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The biosynthesis of heme and chlorophyll
The Botanical Review, 1966Introduction ...... 56 Formation of Heme and Chlorophyll Precursors 60 1. b-Aminolevulinic Acid 60 2. Succinate-Glycine Cycle 62 3. Porphobilinogen 63 4. Uroporphyrinogen III 64 5. Coproporphyrinogen III 69 6. Protoporphyrin IX 70 Insertion of Iron into Protoporphyrin IX 71 Cytochromes and Heme Enzymes 72 The Relationship Between ...
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The effects of chemicals on hepatic heme biosynthesis
Trends in Pharmacological Sciences, 1978The administration of Sedormid (2-isopropylpent-4-enoylurea) to rabbits resulted in an experimental porphyria (Schmid and Schwartz, 1952) and the liver which was shown to be the major site of the metabolic disturbance contained large amounts of uro-, copro-, and proto-porphyrin. Sedormid (Fig.
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Disturbances in the biosynthesis of heme in lead intoxication
The Journal of Pediatrics, 1964O N E of the cardinal manifestations of lead intoxication ia man is disturbance in the synthesis of heme. Indeed, this biosynthetic pathway is so sensitive to the toxic effects of lead, that two of the metaboli tes--delta aminolevulinate and coproporphyr in--can be consistently demonstrated in great excess in the urine even in the absence of clinical ...
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