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HC-toxin is a cyclic tetrapeptide of structure cyclo(D-Pro-L-Ala-D-Ala-L-Aeo), where Aeo stands for 2-amino-9,10-epoxi-8-oxodecanoic acid. It is a determinant of specificity and virulence in the interaction between the producing fungus, Cochliobolus carbonum, and its host, maize. HC-toxin qualifies as one of the few microbial secondary metabolites whose ecological function in nature is understood...
A cyclic hexapeptide hydroxamic acid inhibitor for HDAC6 has been designed and synthesized on the basis of the facts that α-tubulin is the substrate of HDAC6 and of the excellent inhibitory activity of cyclic tetrapeptide hydroxamic acids (CHAPs) for HDACs. Unexpectedly, cyclic hexapeptide hydroxamic acid showed very low HDAC inhibitory activity. To explain the low activity, we have carried out conformation...
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