RESUMEN
Francisella tularensis is the causative agent of tularemia and a potential biowarfare agent. The virulence of F. tularensis is decreased by deletion of guaB, the gene encoding IMP dehydrogenase (IMPDH), suggesting that this enzyme is a target for antibacterial design. Here we report that F. tularensis growth is blocked by inhibitors of bacterial IMPDHs. Seventeen compounds from two different frameworks, designated the D and Q series, display antibacterial activities with MICs of <1 µM. These compounds are also active against intracellular infections. Surprisingly, antibacterial activity does not correlate with IMPDH inhibition. In addition, the presence of guanine does not affect the antibacterial activity of most compounds, nor does the deletion of guaB These observations suggest that antibacterial activity derives from inhibition of another target(s). Moreover, D compounds display antibacterial activity only against F. tularensis, suggesting the presence of a unique target or uptake mechanism. A ΔguaB mutant resistant to compound D73 contained a missense mutation (Gly45Cys) in nuoB, which encodes a subunit of bacterial complex I. Overexpression of the nuoB mutant conferred resistance to D73 in both wild-type and ΔguaB strains. This strain was not resistant to Q compounds, suggesting that a different off-target mechanism operates for these compounds. Several Q compounds are also effective against Mycobacterium tuberculosis, in which a second target has also been implicated, in addition to IMPDH. The fortuitous presence of multiple targets with overlapping structure-activity relationships presents an intriguing opportunity for the development of robust antibiotics that may avoid the emergence of resistance.
Asunto(s)
Antibacterianos/farmacología , Benzoxazoles/farmacología , Francisella tularensis/efectos de los fármacos , IMP Deshidrogenasa/antagonistas & inhibidores , Ftalazinas/farmacología , Animales , Línea Celular , Complejo I de Transporte de Electrón/genética , Humanos , IMP Deshidrogenasa/genética , Ratones , Pruebas de Sensibilidad Microbiana , Relación Estructura-Actividad , Tularemia/tratamiento farmacológico , Tularemia/microbiologíaRESUMEN
Tuberculosis (TB) remains a worldwide problem and the need for new drugs is increasingly more urgent with the emergence of multidrug- and extensively-drug resistant TB. Inosine 5'-monophosphate dehydrogenase 2 (IMPDH2) from Mycobacterium tuberculosis (Mtb) is an attractive drug target. The enzyme catalyzes the conversion of inosine 5'-monophosphate into xanthosine 5'-monophosphate with the concomitant reduction of NAD+ to NADH. This reaction controls flux into the guanine nucleotide pool. We report seventeen selective IMPDH inhibitors with antitubercular activity. The crystal structures of a deletion mutant of MtbIMPDH2 in the apo form and in complex with the product XMP and substrate NAD+ are determined. We also report the structures of complexes with IMP and three structurally distinct inhibitors, including two with antitubercular activity. These structures will greatly facilitate the development of MtbIMPDH2-targeted antibiotics.
Asunto(s)
Antituberculosos/farmacología , IMP Deshidrogenasa/química , IMP Deshidrogenasa/metabolismo , Mycobacterium tuberculosis/enzimología , Antituberculosos/metabolismo , Sitios de Unión , Inhibidores Enzimáticos/farmacología , IMP Deshidrogenasa/antagonistas & inhibidores , IMP Deshidrogenasa/genética , Mycobacterium tuberculosis/efectos de los fármacos , NAD/metabolismo , Unión ProteicaRESUMEN
The steadily rising frequency of emerging diseases and antibiotic resistance creates an urgent need for new drugs and targets. Inosine 5'-monophosphate dehydrogenase (IMP dehydrogenase or IMPDH) is a promising target for the development of new antimicrobial agents. IMPDH catalyzes the oxidation of IMP to XMP with the concomitant reduction of NAD(+), which is the pivotal step in the biosynthesis of guanine nucleotides. Potent inhibitors of bacterial IMPDHs have been identified that bind in a structurally distinct pocket that is absent in eukaryotic IMPDHs. The physiological role of this pocket was not understood. Here, we report the structures of complexes with different classes of inhibitors of Bacillus anthracis, Campylobacter jejuni, and Clostridium perfringens IMPDHs. These structures in combination with inhibition studies provide important insights into the interactions that modulate selectivity and potency. We also present two structures of the Vibrio cholerae IMPDH in complex with IMP/NAD(+) and XMP/NAD(+). In both structures, the cofactor assumes a dramatically different conformation than reported previously for eukaryotic IMPDHs and other dehydrogenases, with the major change observed for the position of the NAD(+) adenosine moiety. More importantly, this new NAD(+)-binding site involves the same pocket that is utilized by the inhibitors. Thus, the bacterial IMPDH-specific NAD(+)-binding mode helps to rationalize the conformation adopted by several classes of prokaryotic IMPDH inhibitors. These findings offer a potential strategy for further ligand optimization.
Asunto(s)
Antiinfecciosos/farmacología , Proteínas Bacterianas/antagonistas & inhibidores , Inhibidores Enzimáticos/farmacología , IMP Deshidrogenasa/antagonistas & inhibidores , Secuencia de Aminoácidos , Antiinfecciosos/química , Bacillus anthracis/efectos de los fármacos , Bacillus anthracis/enzimología , Bacillus anthracis/genética , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Campylobacter jejuni/efectos de los fármacos , Campylobacter jejuni/enzimología , Campylobacter jejuni/genética , Clostridium perfringens/efectos de los fármacos , Clostridium perfringens/enzimología , Clostridium perfringens/genética , Cristalografía por Rayos X , Inhibidores Enzimáticos/química , IMP Deshidrogenasa/química , IMP Deshidrogenasa/genética , Cinética , Modelos Moleculares , Datos de Secuencia Molecular , Estructura Molecular , Mutación , Unión Proteica/efectos de los fármacos , Estructura Terciaria de Proteína , Homología de Secuencia de AminoácidoRESUMEN
Inosine 5'-monophosphate dehydrogenase (IMPDH) catalyzes the pivotal step in guanine nucleotide biosynthesis. IMPDH is a target for immunosuppressive, antiviral, and anticancer drugs, but, as of yet, has not been exploited for antimicrobial therapy. We have previously reported potent inhibitors of IMPDH from the protozoan parasite Cryptosporidium parvum (CpIMPDH). Many pathogenic bacteria, including Bacillus anthracis, Staphylococcus aureus, and Listeria monocytogenes, contain IMPDHs that should also be inhibited by these compounds. Herein, we present the structure-activity relationships for the inhibition of B. anthracis IMPDH (BaIMPDH) and antibacterial activity of 140 compounds from five structurally distinct compound series. Many potent inhibitors of BaIMPDH were identified (78% with IC50 ≤ 1 µM). Four compounds had minimum inhibitory concentrations (MIC) of less than 2 µM against B. anthracis Sterne 770. These compounds also displayed antibacterial activity against S. aureus and L. monocytogenes.