The structure of histargin, an inhibitor of carboxypeptidase B, produced by Streptomyces roseoviridis MF118-A5 strain, has been defined as N-[(S)-1-carboxy-4-guanidinobutyl]-N'-[(S)-1-carboxy-2-(imidazol-4 -yl) ethyl]ethylenediamine, by spectral analysis and chemical synthesis.

A series of sterically shielded pyrrolidine nitroxides were synthesized, and their reduction by ascorbate (vitamin C) indicate that nitroxide 3, a tetraethyl derivative of 3-carboxy-PROXYL, is reduced at the slowest rate among known nitroxides, i.e., at a 60-fold slower rate than that for 3-carboxy-PROXYL.

A series of seven carboxy-terminal deletion mutants of oat phytochrome A were stably expressed in transgenic tobacco to localize phytochrome domains involved in chromophore attachment, spectral integrity, photoreversibility between the red light (Pr)- and far-red light (Pfr)-absorbing forms, dimerization, and biological activity. Amino acids necessary for chromophore attachment in vivo were loc...

Retinoic acid, thyroid hormone, and vitamin D receptors preferentially activate target genes through response elements that consist of direct repeat arrangements of a core recognition motif of consensus sequence AGGTCA. We present evidence that the preference for direct repeat elements arises from two fundamental differences from steroid hormone receptors. First, retinoic acid, thyroid hormone,...

Carbonic-phosphoric anhydride (carboxy phosphate) is formed on the enzyme when glutamine-dependent carbamyl phosphate synthetase (Escherichia coli) is incubated with ATP, Mg’+, and HCO,,-. Carboxy phosphate may be trapped by borohydride reduction to formate and as the trimethyl derivative by treatment with diazomethane. The rate of enzyme-bound carboxy phosphate formation is evidently extremely...

P2X1 receptors are expressed in arteries and blood platelets, play an important role in the cardiovascular system, and their activity can be potentiated following stimulation of Gq coupled receptors or phorbol ester treatment. The contribution of the intracellular carboxy terminus of the P2X1 receptor to this regulation was determined using over-expression of the C terminus and a mutagenesis ba...

Moronic acid is a pentacyclic triterpenoid made up of olean-18-ene with an oxo group at position 3 and carboxy 28. It's from oleanane hydride. A few investigations have demonstrated that wide scope pharmacological effects such as Antidiabetic activity, Anti-AIDS agents, Chemotherapeutic Virus lytic, Anti-HIV, Cytotoxic Anti-herpes, Antimicrobial Ribosome-loaded mRNAs.