Microbial hydrocarbonoclastic responses to extreme marine environments: adaptive strategies of psychrophilic and halophilic microorganisms.

Abstract

The biological remediation of complex petroleum waste streams suffers from severe performance bottlenecks in industrial and marine settings due to the simultaneous thermal, osmotic and mechanical stress. In these hypersaline and multi-extreme matrices, such as produced water, coastal oil spills, and refinery lagoons, conventional mesophiles succumb to rapid plasmolysis, catalytic deceleration, and metabolic uncoupling. Halophilic microorganisms offer indispensable advantages for remediating these hostile environments; their specialized adaptations including acidic proteomes that resist salting-out, compatible solute accumulation that maintains cellular turgor, and cell-bound biosurfactant secretion preserve biocatalytic integrity where conventional degraders fail. This review provides a detailed overview of recent advances in the structural biology of extremophilic enzymes, biosurfactant-mediated interfacial bioavailability changes and genome-scale regulatory networks regulating hydrocarbonoclastic psychrophiles and halophiles. This article integrates structural insights, e.g. localized molecular flexibility of cold-active oxygenases and surface acidity stabilizing salt-tolerant biocatalysts, with functional multi-omics workflows that trace carbon flux from dynamic stress-sensing mechanisms to complete hydrocarbon mineralization. In addition, this paper discusses particular eco-physiological challenges of oil spills in the open ocean, such as the spatial compartmentalization of deep-water plumes, the dynamics of marine oil snow formation, and the metabolic trade-offs imposed by synthetic chemical dispersants. Also, this review discusses how the integration of high-throughput multi-omics data with artificial intelligence pipelines and predictive machine learning algorithms can accelerate strain engineering and bioprocess optimization. Finally, it offers a strong data-driven systems biology approach to move next-generation extremophilic bioprocesses from exploratory laboratory concepts to scalable, field-reproducible industrial realities.

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