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Tetracyclines are composed of a rigid skeleton of 4 fused rings. [2] The rings structure of tetracyclines is divided into an upper modifiable region and a lower non modifiable region. [29] [30] An active tetracycline requires a C10 phenol as well as a C11-C12 keto-enol substructure in conjugation with a 12a-OH group and a C1-C3 diketo substructure.
Tetracycline hydrochloride is available as yellow crystalline powder. Since tetracycline is absorbed into bone, it is used as a marker of bone growth for biopsies in humans. Tetracycline labeling is used to determine the amount of bone growth within a certain period of time, usually a period around 21 days.
The overall structure of TetR can be broken down into two DNA-binding domains (one per monomer) and a regulatory core, which is responsible for tetracycline recognition and dimerization. TetR dimerizes by making hydrophobic contacts within the regulatory core. There is a binding cavity for tetracycline in the outer helices of the regulatory domain.
This is a feature not unique to minocycline, with many tetracyclines exhibiting non-antibiotic clinical benefits. [16] [17] Tigecycline has shown in vitro and in vivo activity against acute myeloid leukemia. The antileukemic activity of tigecycline can be attributed to the inhibition of mitochondrial protein translation in eukaryotic cells.
Doxycycline, a tetracyclic antibiotic. Mirtazapine, a tetracyclic antidepressant. Tetracyclics are cyclic chemical compounds that contain four fused rings of atoms, for example, Tröger's base.
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Oxytetracycline, like other tetracyclines, is used to treat many infections, both common and rare.Its better absorption profile makes it preferable to tetracycline for moderately severe acne at a dosage of 250–500 mg four times a day for usually six to eight weeks at a time, but alternatives should be sought if no improvement occurs by three months.
Teeth discoloration and same side effects as tetracycline. Not to be given to children and pregnant or lactating women. Similar structure with tetracycline, but five times stronger, big volume distribution and long half-time in the body Tinidazole: Tindamax Fasigyn: Protozoal infections: Upset stomach, bitter taste, and itchiness: Trimethoprim(Bs)