Aminotetrazole-Gold Nanocomplexes Shunt Electrons to Eradicate Bacteria Without ROS-Induced Resistance

Area of Science:

• Biochemistry
• Nanotechnology
• Microbiology

Background:

• Bactericides disrupt bacterial electron transport chain (ETC) energy metabolism, often generating reactive oxygen species (ROS).
• ROS at sublethal levels can increase antibiotic resistance risk.
• Current antibacterial strategies face challenges due to ROS generation and resistance.

Purpose of the Study:

• To develop a novel antibacterial approach that avoids ROS generation.
• To investigate shunting electrons at critical ETC nodes for bacterial disruption.
• To synthesize and evaluate 5-aminotetrazole-functionalized gold nanocomplexes (ATZ-Au) for antibacterial activity.

Main Methods:

• Synthesis of 5-aminotetrazole-functionalized gold nanocomplexes (ATZ-Au).
• Interception of electron transfer in bacterial ETC using ATZ-Au.
• Analysis of effects on reduced nicotinamide adenine dinucleotide (NADH), proton motive force (PMF), ATP synthesis, and metabolic pathways.
• Evaluation of bacterial elimination in complex infections.

Main Results:

• ATZ-Au effectively intercepts electron transfer, depleting NADH and disrupting PMF.
• Impaired ATP synthesis and blocked compensatory metabolic pathways observed.
• Lethal intracellular acidosis and metabolic collapse induced in bacteria.
• ROS generation was prevented, demonstrating a ROS-free mechanism.
• Efficient elimination of pathogenic bacteria in complex infections achieved.

Conclusions:

• Electron shunting via ATZ-Au offers a ROS-free antibacterial mechanism.
• This strategy disrupts bacterial energy metabolism leading to metabolic collapse.
• ATZ-Au presents a promising approach to combat bacterial infections and address antibiotic resistance.