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SQ109Antibiotic for treatment of pulmonary T


Catalog No. A3834
Size Price Stock Qty
5mg $80.00 In stock
10mg $135.00 In stock
50mg $545.00 In stock

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Chemical structure


Biological Activity

Description SQ109 is an orally active, small molecule antibiotic for treatment of pulmonary T(tuberculosis).
Targets Mycobacterium TB bacteria        
IC50 1-0.5 μM (MIC)          

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Chemical Properties

Cas No. 502487-67-4 SDF Download SDF
Synonyms NSC 722041;SQ-109;SQ 109
Chemical Name N'-(2-adamantyl)-N-[(2E)-3,7-dimethylocta-2,6-dienyl]ethane-1,2-diamine
Formula C22H38N2 M.Wt 330.55
Solubility Soluble in DMSO Storage Store at -20°C
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SQ109 is a novel antitubercular drug with IC50 value of 0.2 μg/ml on XDR [1].
Tuberculosis is a serious infection disease caused by Mycobacterium tuberculosis (Mtb). It is the leading single-agent killer with highest fatality rate. About more than three million lives were killed by tuberculosis every year. Even so, the existed drugs for TB treatment are facing many challenges including the side effects and the development of multidrug-resistant tuberculosis (MDR-TB). As a novel antitubercular drug, SQ109 has a distinguished mechanism of action and improved potency. The target of it is the mycolic acid transporter MmpL3 required for the synthesis of mycolic acid in cell wall of Mtb [1 and 2].  
SQ109 was screened out from a big chemical library designed around the active pharmacophore of ethambutol (EMB). Even so, SQ109 had different chemical structure, potency and mechanism with EMB. Among the top 27 candidates, SQ109 showed the highest selectivity index value and lowest IC50 value in vitro of 16.7 and 0.78 μg/ml, respectively. SQ109 displayed potent activity against all the substrains of Mtb including XDR- and MDR-TB clinical strains with IC50 values of 0.2 μg/ml. Besides that, SQ109 also showed significant effects on other pathogenic Mycobacteria with MIC values in the range of 4 to 16 μg/ml [1].
SQ109 showed low oral bioavailability in PK studies. The carbamate prodrug of it with improved oral bioavailability (from 21.4% to 91.4 %) exerted a high tissue distribution in rats. In the infected mice, treatment of SQ109 at dose of 10 mg/kg significantly attenuated the symptom of weight loss. In the chronic TB model in mice, 10 mg/kg of SQ109 showed better potency than EMB at dose of 100 mg/kg. Besides that, it was reported that the combination treatment of SQ109 and bedaquiline demonstrated a durable cure in infected mice model [1 and 3].
[1] Sacksteder K A, Protopopova M, Barry C E, et al. Discovery and development of SQ109: a new antitubercular drug with a novel mechanism of action. Future microbiology, 2012, 7(7): 823-837.
[2] Meng Q, Luo H, Liu Y, et al. Synthesis and evaluation of carbamate prodrugs of SQ109 as antituberculosis agents. Bioorganic & medicinal chemistry letters, 2009, 19(10): 2808-2810.
[3] SQ109 (2008) SQ109. Tuberculosis (Edinb) 88, 159–161.
[4] Reddy V M, Dubuisson T, Einck L, et al. SQ109 and PNU-100480 interact to kill Mycobacterium tuberculosis in vitro. Journal of antimicrobial chemotherapy, 2012: dkr589.