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PubMed1981

Effects of L-triiodothyronine on tubulin content in developing male and female rat brain.

The tubulin content and biochemical components were determined in the cerebrum, cerebellum and hypothalamus from intact and T3-treated male and female rats during early life. T3-treatment between 0 and 9 days of age increased soluble protein, RNA DNA and tubulin content (mg per g tissue) in the 10-day-old male cerebellum but not in the cerebrum and hypothalamus except for soluble protein and tubulin (mg per g tissue), respectively. Intracellular tubulin content (mg per mg DNA) was increased by the T3-treatment in the 10-day-old male hypothalamus but not the other regions. When T3 was administered between 10 and 19 days, there was little effect of the treatment; increased tubulin (mg per g tissue) in the cerebrum and decreased RNA (mg per g tissue) and a ratio of tubulin to protein in the cerebellum from 20-day-old males. Less response to T3-treatment was observed in female cerebrum and hypothalamus but not in the cerebellum, compared with the male. These results suggest that the effect of T3-treatment on brain is modified by several factors such as tissue specificity, age-dependency and sexual differences. Modification by these factors might depend, at least in part, on changes in the number of T3-receptors due to the hormone treatment.

Aging↗
PubMed1998

Structure, expression and localization of a germin-like protein in barley (Hordeum vulgare L.) that is insolubilized in stressed leaves.

The primary leaves of young barley seedlings contain two major, extracellular, acid-soluble proteins of ca. 22 and 23 kDa apparent molecular mass. These proteins disappeared from the intercellular washing fluid upon stress treatments that enhanced H2O2 levels and that induced resistance to subsequent challenge by the powdery mildew fungus Erysiphe graminis f. sp. hordei. A partial peptide sequence of the 22 kDa protein was determined, and a cDNA clone was isolated. The 22 kDa protein belongs the the group of germin-like proteins (GLPs) and was designated HvGLP1. Despite its similarity to germin, i.e. oxalate oxidase, no oxalate oxidase activity of HvGLP1 could be detected. The RNA and soluble protein of HvGLP1 was highly abundant in young leaves, less abundant in older leaves and absent in roots. HvGLP1 RNA oscillated with a circadian rhythm, the minimum and maximum of RNA abundance being at the end of the dark and light periods, respectively. Heat and H2O2 treatment as well as pathogen infection caused disappearance of HvGLP1 protein from the fraction of soluble proteins of the intercellular space. HvGLP1 protein could be re-solubilized from cell walls of heat- or H2O2-treated leaves by boiling in SDS suggesting non-covalent cross linking. Although a physiological role of HvGLP1 insolubilization is still open, the protein may serve as marker for oxidative stress in cereals.

Amino Acid Sequence↗
PubMed1989

[Chemical reactions in double-helical nucleic acids. VIII. Assembly of hybrid RNA-DNA-duplexes using water soluble condensing agents].

Condensation of oligonucleotides containing ribonucleotide segments (from mononucleotide to full sequence) on DNA-template was studied, with cyanogen bromide and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide as condensing agents. Efficiency of the chemical ligation of RNA oligomers was much lower than that of DNA analogues. The yield of chemical ligation products was found to depend on the position of RNA segment in the hybrid duplexes and on the position of the phosphate group in the nick. The oligoribonucleotide's length does not affect the yield of condensation products. A nick in 5S RNA loop was repaired by means of the chemical ligation method.

Autoradiography↗