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Incorporation of modified amino acids into proteins in vivo 总被引:4,自引:0,他引:4
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Incorporation of precursors into Toxoplasma DNA 总被引:4,自引:0,他引:4
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Incorporation in vitro of labeled amino acids into proteins of rabbit reticulocytes 总被引:21,自引:0,他引:21
BORSOOK H DEASY CL HAAGENSMIT AJ KEIGHLEY G LOWY PH 《The Journal of biological chemistry》1952,196(2):669-694
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Incorporation of 14C-labelled fatty acids into the mammary-gland lipids of the lactating rabbit 总被引:2,自引:2,他引:0 下载免费PDF全文
1. [1-(14)C]Stearic acid, [9-(14)C]stearic acid, [9-(14)C]palmitic acid and [9-(14)C]decanoic acid were fed to lactating rabbits, and the fatty acids of the mammary gland were separated and partially degraded. 2. Most of the (14)C recovered was located in the acids fed. Stearic acid was least efficiently absorbed; decanoic acid was the most extensively metabolized. 3. Resynthesis after degradation to C(2) units led to uniform alternate labelling in the C(2)-C(10) acids, whereas C(12)-C(18) acids had excess of (14)C at the carboxyl end. 4. Acids formed by beta-oxidation down to C(12), but not below, were also present in the mammary-gland lipids. Desaturation of the administered acids was a very minor reaction. 相似文献
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Incorporation of exogenous precursors into uridine and ribonucleic acid. Nucleotide compartmentation in the renal cortex in vivo 总被引:1,自引:0,他引:1 下载免费PDF全文
Pedro Cortes Nathan W. Levin Francis Dumler Kumarapuram K. Venkatachalam Chacko P. Verghese Jay Bernstein 《The Biochemical journal》1979,182(3):677-686
The possibility of compartmentation of UTP in vivo was investigated in the renal cortex of unanaesthetized rats. In addition, liver and spleen were studied in order to compare tissues with different utilization of precursors for pyrimidine nucleotide synthesis. After continuous 2h infusions of [(3)H]uridine or [(3)H]orotate, their incorporation into UTP, UDP-sugars and RNA was quantified. Rates of RNA synthesis were calculated by dividing the incorporation of precursor into RNA by the average specific radioactivity of the UTP pool. Although similar RNA-synthesis rates might have been expected with the two precursors, higher rates were found with uridine than with orotate. The relative incorporation into UDP-sugars of these precursors was also different. Similar results were obtained in the liver. In the spleen, equal amounts of both precursors were incorporated into UTP, but [(3)H]orotate incorporation did not lead to labelling of RNA. To evaluate the heterogeneity of cells with respect to the metabolism of pyrimidines, precursor incorporation was studied in isolated glomeruli and by radioautography. Incorporation into glomeruli was qualitatively similar to but quantitatively different from results in the renal cortex. Although there is obvious tissue heterogeneity, compartmentation of UTP pools is the most credible explanation for the results obtained with the renal cortex and liver. Consequently RNA and UDP-sugars may originate from two different UTP pools. Tissue heterogeneity is the likely explanation for the results obtained in the spleen. Studies of synthesis of pyrimidine and RNA, particularly in relation to growth and regeneration, must take into consideration the precursor used, the apparent existence of UTP compartmentation and the degree of cellular heterogeneity. 相似文献
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W Neupert W Sebald A J Schwab P Massinger T Bücher 《European journal of biochemistry》1969,10(3):589-591
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W Kaiser 《European journal of biochemistry》1969,8(1):120-127
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