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These studies were undertaken to analyze the changes in testicular ornithine decarboxylase (ODC) mRNA levels and ODC activity in rats from birth to maturity. Levels of ODC mRNA were initially low in animals aged 10-17 days. Beginning at 21 days, ODC mRNA levels began to rise, reaching maximal levels by 40 days (p less than 0.01). The size of the 2.2- and(More)
A previously described transferrin binding protein from chicken oviduct has been identified as a heat shock protein, HSP108, by microsequencing of RP-HPLC purified tryptic peptides. The protein purified from oviduct by SDS-PAGE or from liver by ovotransferrin-affinity chromatography reacts with a monoclonal antibody raised against HSP108. The cDNA sequence(More)
Two cDNA clones representing rat hepatoma thymidylate synthase (rTS) were isolated from a lambda ZAP II cDNA library using as a probe a fragment of the human TS cDNA. The two were identical except that one was missing 50 bp and the other 23 bp corresponding to the 5' coding region of the protein. The missing region was obtained by screening a rat genomic(More)
Previous studies have demonstrated that gonadotropin increases ornithine decarboxylase (ODC) activity in the rat ovary. The increase of ODC activity following gonadotropin stimulation is localized primarily to proliferating granulosa cells. The present studies were undertaken to characterize the mechanism of this hormone-induced increase of ODC. A single(More)
The cDNA encoding human dCMP deaminase was isolated from a lambda ZAPII expression library using an antibody generated against highly purified HeLa cell dCMP deaminase. The cloned cDNA consists of 1856 base pairs and encodes a protein of 178 amino acids with a calculated molecular mass of 19,985 daltons. The sequence of several cyanogen bromide-cleaved(More)
Deoxycytidylate deaminase is an allosteric enzyme whose impairment can lead to deoxynucleotide imbalances that affect the fidelity of DNA synthesis. A DNA fragment encompassing the gene for deoxycytidylate deaminase has been isolated from a human lung fibroblast genomic library and sequenced in both directions through 26,764 base pairs. The previously(More)
We have previously shown that pretreatment of Sertoli cells, derived from 21-day-old Wistar rats, with 5 x 10(-7) M testosterone decreases ornithine decarboxylase (ODC) mRNA levels. In the present study we examined the mechanism of this inhibition. Pretreatment of Sertoli cells for 48 h with 5 x 10(-7) M testosterone decreased ODC mRNA levels 30% at all(More)
We have previously reported that testosterone decreased ornithine decarboxylase (ODC) activity in primary cultures of rat Sertoli cells. In this report we examined the mechanism of this reduction. In cells pretreated with testosterone (5 x 10(-7) M) for 48 h before the start of the experiment ODC activity was decreased, on the average, 43% at all time(More)
Chicken heat shock protein 108 (HSP108), the avian homolog of GRP94, was originally isolated from hen oviduct and binds Fe-ovotransferrin (Fe-OTf). The liver is also a rich source, and liver membranes bind Fe-OTf with a KD of 1.7 x 10(-7) M, a value similar to oviduct membranes. A competition assay, based on the binding of 125I-Fe-OTf to liver membranes,(More)
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