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Biochemistry of Zinc by Ananda S. Prasad

By Ananda S. Prasad

In reaction to the global illnesses as a result of dietary zinc deficiency, coupled with the outstanding advances in our wisdom of zinc metabolism, the writer has written this monograph at the medical results of this significant mineral. Dr. Prasad makes a speciality of biochemical facets, but in addition contains chapters on toxicity and evaluate concepts which will offer clinicians who come across zinc similar difficulties of their perform with a realistic reference source.

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Sample text

This is the third step in biosynthesis of pyrimidines. In mammalian cells DHO activity resides in a 240-kDa protein that also has carbamoylphospate synthetase and aspartate transcarbamylase activities. Only the DHO domain contains zinc that is essential for catalytic activity. This 44kDa domain contains seven thiols and one stable zinc. It is possible that some zinc ions may have been lost during isolation inasmuch as the zinc content of bacterial DHO varies with isolation procedure. According to this model (as shown in Fig.

Coli RNA polymerase are required for enzymatic activity comes from the finding that the addition of zinc is necessary to reconstitute active enzyme from urea-denatured inactive apoenzyme. , 1977), Co-Zn, and Ni-Zn enzymes induced by nucleotides or DNA template. Comparative studies of E. coli Co-Co and Zn-Zn RNA polymerase and the observations that these two enzymes have different efficiencies in utilizing the A2 promoter versus the AI + A3 promoters ofT7 DNA suggest a regulatory role for the intrinsic metal ion.

E. 025. The activity of TK was also assayed in implanted sponge connective tissue in three groups of human subjects: ( 1) five normal controls (having normal levels of plasma and red cell zinc), (2) four patients with sickle-cell anemia who had low zinc in red cells and hair, and (3) two volunteers (under strict dietary control), after 6 months of zinc depletion (intake 2. 7 mg/day) and repeated after 3 months ofzinc repletion (intake 30 mg/day). , 1979). In sickle-cell anemia subjects, TK activity was not detected, and RNA/DNA, total collagen, and total protein contents were decreased compared with normal controls.

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