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Identification of small molecules that selectively inhibit streptokinase expression without suppression of viability in Group A streptococci - Probe 2.


Probe Reports from the NIH Molecular Libraries Program [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2010-.
2010 Feb 26 [updated 2011 Mar 11].


Streptokinase is a major group A streptococcus (GAS) virulence factor and plays critical roles in GAS pathogenicity. We set out to identify and develop novel small molecule probes that inhibit streptokinase (SK) expression in GAS without suppressing cell growth to minimize potential drug resistance. We screened the MLPCN library of over 300,000 compounds and identified a second small molecular probe. The probe ML134 (CID-1612038), 4-methoxy-2-(4-propoxyphenyl)quinazoline, selectively inhibits SK expression with an IC50 of 4.2 μM in a GAS strain and has no effect on bacterial growth. A series of analogs were synthesized to explore the structure activity relationships. These analogs showed over 10-fold range in potency of inhibition of SK expression, and revealed key structural requirements for optimal potency and selectivity. The probe ML126 (CID-576989) and its analogs are another set of excellent molecular tools to investigate regulation of SK expression and mechanisms of GAS infection.

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