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Geldanamycin, a crystalline antimicrobial compound derived from the culture filtrates of Streptomyces hygroscopicus var. geldanus var. nova., is a potent and specific inhibitor of heat shock protein 90 (Hsp90) that specifically binds to the unique ATP binding pocket of Hsp90 in a stable and pharmacologically specific manner. As an antimicrobial agent, geldanamycin exhibits moderate activity against protozoa, bacteria and fungi as well as parasite Syphacia oblevata and cell cultures of L-1210 and KB. Recent studies have shown that geldanamycin also inhibits the function of glucocorticoid receptor and endothelium-dependent relaxation of the rat aorta, mesentery and middle artery.

Reference

[1].Bucci M, Roviezzo F, Cicala C, Sessa WC, Cirino G. Geldanamycin, an inhibitor of heat shock protein 90 (Hsp90) mediated signal transduction has anti-inflammatory effects and interacts with glucocorticoid receptor in vivo. Br J Pharmacol. 2000; 131(1): 13-16.

[2].DeBoer C, Meulman PA, Wnuk RJ, Peterson DH. Geldanamycin, a new antibiotic. J Antibiot (Tokyo). 1970; 23(9):442-447.