منابع مشابه
Molecular logic of the Zur-regulated zinc deprivation response in Bacillus subtilis
Bacteria respond dynamically to the changes in zinc availability. Repression by the Bacillus subtilis transcription factor Zur requires Zn(II), which binds with negative cooperativity to two regulatory sites per dimer to form, sequentially, Zur2:Zn3 and Zur2:Zn4 forms of the repressor. Here we show that, as cells transition from zinc sufficiency to deficiency, operons regulated by Zur are derep...
متن کاملFailure of exogenous IGF-I to restore normal growth in rats submitted to dietary zinc deprivation.
Dietary zinc deficiency in rats causes growth retardation associated with decreased circulating IGF-I concentrations. To investigate the potential role of low IGF-I in this condition, we attempted to reverse the growth failure by administration of exogenous IGF-I. Rats were fed for 4 weeks a zinc-deficient diet (ZD, Zn 0 ppm) or were pair-fed a zinc-normal diet (PF, Zn 75 ppm). We compared the ...
متن کاملStudies of marginal zinc deprivation in rhesus monkeys. I. Influence on pregnant dams.
Rhesus monkeys were fed a diet marginally deficient in zinc (4 ppm zinc) throughout pregnancy and were monitored for changes in hematological, biochemical, and immunological parameters. This dietary zinc level was chosen because it did not produce an overt deficiency syndrome when fed for 10 wk to nonpregnant monkeys. Deprived animals were compared to control groups fed a zinc replete (100 ppm)...
متن کاملInhibition of Dna Synthesis in Chick Embryo Cultures by Deprivation of Either Serum or Zinc
The rate of DNA synthesis in cultures of chick embryo cells is proportional to the concentration of serum added. The concentration of serum required to stimulate DNA synthesis increases with cell population density and with the duration of culture after trypsinization. The increase of the serum requirement with population density is not caused by the depletion of serum constituents. The require...
متن کاملATP-Sensitive K+ Channel Mediates the Zinc Switch-Off Signal for Glucagon Response During Glucose Deprivation
OBJECTIVE The intraislet insulin hypothesis proposes that glucagon secretion during hypoglycemia is triggered by a decrease in intraislet insulin secretion. A more recent hypothesis based on in vivo data from hypoglycemic rats is that it is the decrease in zinc cosecreted with insulin from beta-cells, rather than the decrease in insulin itself, that signals glucagon secretion from alpha-cells d...
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ژورنال
عنوان ژورنال: Nature Immunology
سال: 2013
ISSN: 1529-2908,1529-2916
DOI: 10.1038/ni.2779