The discovery by UC Irvine's Thomas Poulos and Northwestern's Richard Silverman builds on previous work in which they created compounds that inhibit an enzyme called neuronal nitric oxide synthase. These have demonstrated the potential to treat neurodegenerative diseases by blocking overproduction of cell-killing nitric oxide within neurons.
After Poulos and Silverman read a study suggesting that nitric oxide synthase helped pathogenic bacteria resist antibiotics, their laboratory teams paired the inhibitor compounds with currently used antibiotics to see if they could suppress NOS- and increase the antibiotics' effectiveness.
'We found that NOS inhibitors were extremely successful at inhibiting neurodegeneration in an animal model, and if they could be successful combating other diseases, we wanted to identify that as quickly as possible to help other people,' Poulos said.
The researchers tested their compounds on Bacillus subtilis, nonpathogenic bacteria very similar to Staphylococcus aureus (known as MRSA), and Bacillus anthracis, which causes anthrax. Bacteria treated with the NOS inhibitors and an antibiotic were killed off more efficiently and completely than bacteria treated with only an antibiotic.
The scientists then compared the three-dimensional structure of the inhibitors bound to the bacterial NOS with those bound to the neuronal NOS and determined that they bonded quite differently.
The study was published in Proceedings of the National Academy of Sciences.
--ANI (Posted on 26-11-2013)