Prostaglandin H2 (PGH2) was first isolated from incubations of arachidonic acid with ovine seminal vesicle microsomes, and was described as a potent vasoconstrictor.{365} PGH2 is the precursor for all 2-series PGs and thromboxanes (TXs),{187} and is a TP receptor agonist which irreversibly aggregates human platelets at 50-100 ng/ml.
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A COX metabolite of arachidonic acid and precursor for all 2-series ,PGs and TXs; acts as a TP receptor agonist and suicide substrate for TX synthase (Ki = 18 µM)
Formal name: 9α,11α-epidioxy-15S-hydroxy-prosta-5Z,13E-dien-1-oic acid
Synonyms: PGH2
Molecular weight: 352.5
CAS: 42935-17-1
Purity: ≥95%
Formulation: A solution in acetone
Product Type|Biochemicals|Lipids|Prostaglandins||Research Area|Lipid Biochemistry|Cyclooxygenase Pathway
The tetracycline repressor (TetR) is a transcriptional regulator which normally binds tightly to its palindromic tetO operator DNA, blocking gene expression.{17508} Tet causes the repressor to dissociate from the DNA, allowing transcription to occur. A novel reverse TetR (revTetR) requires tetracycline as a co-repressor to bind tetO and block transcription.{17509,17510} Anhydrotetracycline (hydrochloride) is a powerful effector in both the tetracycline repressor (TetR) and reverse TetR (revTetR) systems, binding the Tet repressor 35-fold more strongly than Tet.{17508,17511} Moreover, anhydrotetracycline poorly binds the 30S ribosomal subunit, compared to Tet,{17512} so it does not act as a general inhibitor of translation and is a poor antibiotic. Perhaps related to this, the concentration of anhydrotetracycline that inhibits eukaryotic cell growth is more than a 1,000-fold above the dose that alters transcription through TetR.{17508}
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The PtdIn phosphates play an important role in the generation and transduction of intracellular signals.{8344,4096,14518} PtdIns-(3,4,5)-P3-biotin is an affinity probe which allows the PIP3 to be detected through an interaction with the biotin ligand. This design allows PtdIns-(3,4,5)-P3-biotin to serve as a general probe for any protein with a high affinity binding interaction with inositol-(3,4,5)-triphosphate phospholipids, such as phosphatidylinositol 3-kinase, PTEN, or PH-domain-containing proteins.
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