Molecular Evolution of Transition Metal Bioavailability at the Host-Pathogen Interface.

Area of Science:

• Microbiology
• Molecular Biology
• Evolutionary Biology

Background:

• The host-pathogen interface is characterized by an evolutionary 'arms race'.
• The innate immune system restricts microbial metal access (nutritional immunity).
• Pathogens evolve mechanisms to acquire essential metals despite host restrictions.

Purpose of the Study:

• To review the molecular evolution of host metalloproteins and bacterial metal acquisition systems.
• To explore how proteins are repurposed or re-engineered during host-pathogen coevolution.
• To examine the evolution of metalloenzymes in the context of nutritional immunity.

Main Methods:

• Review of literature on host metalloproteins and bacterial metal acquisition.
• Analysis of coevolutionary dynamics between host and pathogen.
• Discussion of protein functional evolution and adaptation.

Main Results:

• Human metalloproteins like S100 proteins, NRAMP-1, transferrin, lactoferrin, and heme-binding proteins have coevolved with bacterial metal uptake systems.
• Bacterial strategies include siderophores and membrane-spanning importers.
• Evolution of metallo-β-lactamases demonstrates adaptation within nutritional immunity constraints.

Conclusions:

• Molecular evolution drives adaptive responses at the host-pathogen interface.
• Understanding protein repurposing is key to comprehending host-pathogen coevolution.
• Metalloenzyme evolution is intrinsically linked to host-imposed nutritional immunity.