Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 6, Problem 6Q
Summary Introduction
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The treatment that can be administered to infants suffering from Menkes’ syndrome, so that the symptoms of the disorder can be avoided.
Introduction:
Copper acts as a cofactor for enzymes like lysyl oxidase and superoxide dismutase. Copper is mainly present in the protein called ceruloplasmin, which is a deep blue glycoprotein. Itsmajor function is to transport and maintain the levels of the copper (Cu2+ ) ions in the body. Ceruloplasmin also maintains the iron
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Copper is a cofactor in several enzymes, including lysyl oxidase and superoxide dismutase.Ceruloplasmin, a deep-blue glycoprotein, is the principal copper-containing protein in blood. It isused to transport Cu2+ and maintain appropriate levels of Cu2+ in the body’s tissues.Ceruloplasmin also catalyzes the oxidation of Fe2+ to Fe3+, an important reaction in ironmetabolism. Because the metal is widely found in foods, copper deficiency is rare in humans.Deficiency symptoms include anemia, leukopenia (reduction in blood levels of white blood cells),bone defects, and weakened arterial walls. The body is partially protected from exposure toexcessive copper (and several other metals) by metallothionein, a small, metal-binding protein thatpossesses a large proportion of cysteine residues. Certain metals (most notably zinc and cadmium)induce the synthesis of metallothionein in the intestine and liver.In Menkes syndrome intestinal absorption of copper is defective. How can affected infants…
Phosphoglycerate mutase transfers a phosphoryl group from C3 of 3-phosphoglycerate to C2 position to give 2-phosphoglycerate. Why is it important to have the phosphoryl group at position 2 rather than at C3? It was observed that the activity of some preparations of the enzyme could be increased if catalytic (very small) amount of 2, 3-bisphosphoglycerate was added to the enzyme. Give a possible explanation for this observation.
In 1937, two German biochemists published a paper proposing these reactions as part of glucose oxidation: citrate → isocitrate → α-ketoglutarate →succinate → fumarate → malate → oxaloacetate. Adding succinate, fumarate, or malate to thin slices of tissue increased oxygen consumption, supporting the hypothesis that these molecules are intermediates in the process. However, they were puzzled by the observation that these intermediates were still present in the reaction mixture at the end of the experiment. They had thought that intermediates would be consumed as they were converted to the next molecule in the pathway.
What explains the observation that these intermediates were still present?
a) The pathway is a cycle, constantly regenerating intermediates as glucose is broken down.
b) Succinate, fumarate, and malate are not reactants but catalysts, and catalysts are not consumed in the process.
c) Succinate, fumarate, and malate increase metabolism and therefore oxygen consumption,…
Chapter 6 Solutions
Biochemistry: The Molecular Basis of Life
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