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At least 721 records · Page 40Linked to original sources
PubMed1987

Molecular cloning of rat insulin-like growth factor I complementary deoxyribonucleic acids: differential messenger ribonucleic acid processing and regulation by growth hormone in extrahepatic tissues.

Two classes of insulin-like growth factor I (IGF-I) cDNAs were isolated from an adult rat liver library using a human IGF-I cDNA probe. The two types of rat IGF-I cDNA differed by the presence or absence of a 52-base pair insert which altered the derived C-terminal amino acid sequence of the E peptide, but not the 3'-untranslated region or the sequence coding for the mature IGF-I protein. When probes derived from these cDNA clones were hybridized to Northern blots of rat mRNA, specific bands of 8.6, 2.1, and 1.0-1.4 kilobases were seen. Hybridization to poly(A)+ RNA from various tissues from GH-treated and control rats demonstrated an increase in IGF-I mRNA due to GH treatment in all tissues examined.

Animals↗
PubMed1965

The effect of chick-liver ribonucleic acid on amino acid-incorporation systems from rat liver.

1. Rat-liver microsomes, ribonucleoprotein particles and a fraction mainly consisting of microsomal membranes were tested for their ability to incorporate amino acids into protein in the presence of ATP, GTP, phosphoenolpyruvate and pyruvate kinase. Addition of polyuridylic acid or of ribonucleic acid from rat-liver nuclei stimulated the incorporating activities. 2. These protein-synthesizing systems were found to be susceptible to ribonucleic acid from chick-liver nuclei as well. The biological activity of the ribonucleic acid from chick liver was measured by its capacity to stimulate amino acid incorporation. 3. In the presence of chick-liver ribonucleic acid, the ribonucleoprotein particles from rat liver showed an increased radioactivity in ribosomal units with a sedimentation constant higher than 70s. 4. This was investigated by sucrose-gradient centrifugation or by column chromatography on agarose suspensions.

Adenosine Triphosphate↗
PubMed1968

Nuclear fraction of Bacillus subtilis as a template for ribonucleic acid synthesis.

A "nuclear fraction" prepared from Bacillus subtilis was a more efficient template than purified deoxyribonucleic acid for the synthesis of ribonucleic acid by exogenously added ribonucleic acid polymerase isolated from B. subtilis. The initial rate of synthesis with the nuclear fraction was higher and synthesis continued for several hours, yielding an amount of ribonucleic acid greater than the amount of deoxyribonucleic acid used as the template. The product was heterogenous in size, with a large portion exceeding 23S. When purified deoxyribonucleic acid was the template, a more limited synthesis was observed with a predominantly 7S product. However, the ribonucleic acids produced in vitro from these templates were very similar to each other and to in vivo synthesized ribonucleic acid as determined by the competition of ribonucleic acid from whole cells in the annealing of in vitro synthesized ribonucleic acids to deoxyribonucleic acid. Treatment of the nuclear fraction with heat (60 C for 15 min) or trypsin reduced the capacity of the nuclear fraction to synthesize ribonucleic acid to the level observed with purified deoxyribonucleic acid.

Adenosine Triphosphate↗