Lanthanide-Dependent Methanol Oxidation Mechanisms
Summary
Lanthanide-dependent methanol oxidation has emerged as a critical biochemical pathway in which rare earth elements serve as essential cofactors for methanol dehydrogenases. Methylotrophic bacteria employ two principal classes of periplasmic enzymes: the classical calcium-dependent MxaF-type and the lanthanide-dependent XoxF-type methanol dehydrogenases. Incorporation of lanthanide ions into the active site of XoxF induces structural rearrangements around the pyrroloquinoline quinone (PQQ) cofactor, enhancing catalytic efficiency and altering substrate specificity. A dedicated regulatory network senses extracellular lanthanide availability and orchestrates a switch between MxaF and XoxF expression, thereby tuning carbon flux through formaldehyde and formate assimilation or detoxification pathways. High-resolution structures have revealed metal coordination geometry and proton–electron transfer channels, while environmental surveys have mapped the global distribution of lanthanide-dependent systems. Together, these advances underscore the intimate link between trace metal geochemistry and microbial one-carbon metabolism, with promising applications in biocatalysis, bioremediation and sustainable carbon management.
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Lanthanide-Dependent Methanol Oxidation Mechanisms publication trend
The graph below shows the total number of articles in lanthanide-dependent methanol oxidation mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Lanthanide: A series of 15 metallic elements (atomic numbers 57–71) that can act as cofactors in specialised enzymes.
Methanol dehydrogenase (MDH): A periplasmic enzyme that catalyses the oxidation of methanol to formaldehyde.
Pyrroloquinoline quinone (PQQ): A redox-active cofactor essential for the catalytic function of certain dehydrogenases.
XoxF: A family of lanthanide-dependent methanol dehydrogenases distinguished by metal coordination and enhanced catalytic properties.
MxaF: A calcium-dependent methanol dehydrogenase commonly found in methylotrophic bacteria prior to lanthanide availability.
Methylotroph: An organism capable of utilising single-carbon compounds, such as methanol, as sole carbon and energy sources.
Formaldehyde: A reactive intermediate produced during methanol oxidation that must be rapidly assimilated or detoxified.
References
- Functional Role of Lanthanides in Enzymatic Activity and Transcriptional Regulation of Pyrroloquinoline Quinone-Dependent Alcohol Dehydrogenases in Pseudomonas putida KT2440. mBio (2017).
- Lanthanide-Dependent Regulation of Methylotrophy in Methylobacterium aquaticum Strain 22A. mSphere (2018).
- Lanthanide-Dependent Methanol Dehydrogenases of XoxF4 and XoxF5 Clades Are Differentially Distributed Among Methylotrophic Bacteria and They Reveal Different Biochemical Properties. Frontiers in Microbiology (2018).
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