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Ansamycin Antineoplastic Antibiotic
Definition 1
An antineoplastic antibiotic of macrocyclic benzoquinone isolated from the bacterial genus Streptomyces. Ansamycin antibiotics bind to and inhibit the cytosolic chaperone functions of heat shock protein 90 (HSP90). HSP90 maintains the stability and functional shape of many oncogenic signaling proteins and the inhibition of HSP90 promotes the proteasomal degradation of oncogenic signaling proteins that may be over-expressed or overactive in tumor cells. (NCI Thesaurus)
Definition 2
An anticancer drug that belongs to the family of drugs called antineoplastic antibiotics. (NCI Dictionary)
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