Adaptation to hydrostatic pressure modulates proteome dynamics in corrosive sulfate-reducing bacteria

Area of Science:

• Marine microbiology
• Corrosion science
• Proteomics

Background:

• Microbially influenced corrosion (MIC) is a significant industrial problem, exacerbated by deep-sea exploration.
• Understanding microbial adaptations to extreme environments like high hydrostatic pressure is crucial for predicting corrosion.
• Sulfate-reducing bacteria (SRB) are key players in MIC, but their pressure-dependent behaviors are not fully understood.

Purpose of the Study:

• To investigate the physiological and corrosive responses of SRB to varying hydrostatic pressures.
• To identify species-specific corrosion mechanisms and proteomic changes related to pressure adaptation.
• To elucidate the complex relationship between microbial physiology, hydrostatic pressure, and MIC severity.

Main Methods:

• Proteomic analysis of two SRB species with different hydrostatic pressure optima.
• Simulation of deep-sea conditions, including hydrostatic pressures up to 3,000 m.
• Comparative analysis of corrosion rates and proteomic profiles under simulated pressure gradients.

Main Results:

• Distinct proteomic profiles were observed in SRB correlating with hydrostatic pressure adaptation.
• Species-specific corrosion mechanisms were identified, influenced by pressure optima.
• Opposing trends in corrosion rates were noted, highlighting the complexity of MIC under pressure.

Conclusions:

• Microbial adaptations to hydrostatic pressure significantly influence MIC mechanisms and severity.
• Proteomic insights are vital for understanding how environmental stresses like pressure affect bacterial corrosion.
• Accurate corrosion risk assessments for deep-sea infrastructure require characterization of microbial pressure responses.