24-Sep-2019 - Nagoya University

Researchers find way to kill pathogen resistant to antibiotics

Pseudomonas aeruginosa is a dangerous bacterium that causes infections in hospital settings and in people with weakened immune systems. It can cause blood infections and pneumonia, while severe infections can be deadly. Highly resistant to antibiotic treatment, P. aeruginosa is one of the most critical pathogens urgently requiring alternative treatment strategies, according to the World Health Organization.

This bacterium is one of many that have evolved a system that allows them to acquire difficult-to-access iron from the human body. Iron is essential for bacterial growth and survival, but in humans, most of it is held up within the 'haem' complex of haemoglobin. To get hold of it, P. aeruginosa and other bacteria secrete a protein, called HasA, which latches onto haem in the blood. This complex is recognized by a membrane receptor on the bacterium called HasR, permitting haem entry into the bacterial cell, while HasA is recycled to pick up more haem.

Bioinorganic chemist Osami Shoji of Nagoya University and collaborators have found a way to hijack this 'haem acquisition system' for drug delivery. They developed a powder formed of HasA and the pigment gallium phthalocyanine (GaPc), which, when applied to a culture of P. aeruginosa, was consumed by the bacteria.

"When the pigment is exposed to near-infrared light, harmful reactive oxygen species are generated inside the bacterial cells," explains Shoji. When tested, over 99.99% of the bacteria were killed following treatment with one micromolar of HasA with GaPc and ten minutes of irradiation.

The strategy also worked on other bacteria with the HasR receptor on their membranes, but not on ones without it.

The haem acquisition system is so essential to these bacteria's survival that it is not expected to change, making it unlikely the bacteria will develop resistance to this drug strategy, the researchers believe.

"Our findings support the use of artificial haem proteins as a Trojan horse to selectively deliver antimicrobials to target bacteria, enabling their specific and effective sterilization, irrespective of antibiotic resistance," the team reports in their study.

Facts, background information, dossiers
More about Nagoya University
  • News

    Making Puffer Fish Toxin in a Flask

    In Japan, puffer fish is considered a delicacy, but the tickle to the taste buds comes with a tickle to the nerves: fugu contains tetrodotoxin, a strong nerve toxin. In low doses, tetrodotoxin is shown in clinical trials to be a replacement for opioids for relieving cancer related pain. In ... more

    'Tricking' bacteria into hydroxylating benzene

    Breaking carbon-hydrogen bonds is notoriously difficult in lab chemistry, yet nature does it effortlessly. Now, scientists have used E.coli bacteria to oxidize the C-H bonds in benzene to generate phenol, with a genetically inserted enzyme (cytochrome P450BM3), that originally evolved to ta ... more

    Water-Soluble Warped Nanographene

    Graphene and its nano-sized little sibling, nanographene, are well known for their remarkable photoelectronic properties. However, biomedical applications are hampered by the insolubility of the materials, especially in water. A Japanese team of scientists has now introduced substituted “wa ... more