Document Detail

Polymyxin B identified as an inhibitor of alternative NADH dehydrogenase and malate: quinone oxidoreductase from the Gram-positive bacterium Mycobacterium smegmatis.
MedLine Citation:
PMID:  19564154     Owner:  NLM     Status:  MEDLINE    
Tuberculosis is the leading cause of death due to a single infectious agent in the world and the emergence of multidrug-resistant strains prompted us to develop new drugs with novel targets and mechanism. Here, we screened a natural antibiotics library with Mycobacterium smegmatis membrane-bound dehydrogenases and identified polymyxin B (cationic decapeptide) and nanaomycin A (naphtoquinone derivative) as inhibitors of alternative NADH dehydrogenase [50% inhibitory concentration (IC(50)) values of 1.6 and 31 microg/ml, respectively] and malate: quinone oxidoreductase (IC(50) values of 4.2 and 49 microg/ml, respectively). Kinetic analysis on inhibition by polymyxin B showed that the primary site of action was the quinone-binding site. Because of the similarity in K(m) value for ubiquinone-1 and inhibitor sensitivity, we examined amino acid sequences of actinobacterial enzymes and found possible binding sites for L-malate and quinones. Proposed mechanisms of polymyxin B and nanaomycin A for the bacteriocidal activity were the destruction of bacterial membranes and production of reactive oxygen species, respectively, while this study revealed their inhibitory activity on bacterial membrane-bound dehydrogenases. Screening of the library with bacterial respiratory enzymes resulted in unprecedented findings, so we are hoping that continuing efforts could identify lead compounds for new drugs targeting to mycobacterial respiratory enzymes.
Tatsushi Mogi; Yoshiro Murase; Mihoko Mori; Kazuro Shiomi; Satoshi Omura; Madhavi P Paranagama; Kiyoshi Kita
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-06-29
Journal Detail:
Title:  Journal of biochemistry     Volume:  146     ISSN:  1756-2651     ISO Abbreviation:  J. Biochem.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-07     Completed Date:  2010-01-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376600     Medline TA:  J Biochem     Country:  England    
Other Details:
Languages:  eng     Pagination:  491-9     Citation Subset:  IM    
Department of Biomedical Chemistry, Graduate School of Medicine, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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MeSH Terms
Binding Sites / drug effects
Dose-Response Relationship, Drug
Enzyme Inhibitors / chemistry,  pharmacology*
Mycobacterium smegmatis / enzymology*
NADH Dehydrogenase / antagonists & inhibitors*
Naphthoquinones / chemistry,  pharmacology
Oxidoreductases / antagonists & inhibitors*
Polymyxin B / chemistry,  pharmacology*
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Naphthoquinones; 1404-26-8/Polymyxin B; 52934-83-5/nanaomycin A; EC 1.-/Oxidoreductases; EC 1.3.5.-/malate dehydrogenase, FAD-dependent; EC Dehydrogenase

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