Lanmodulin Ortholog Engineering for Single-Stage Rare Earth Separation
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Solution Overview
Problem
Conventional methods for separating rare earth elements are inefficient and environmentally harmful, requiring numerous stages and toxic solvents, while existing lanthanide-binding proteins like Mex-LanM lack sufficient selectivity between light and heavy rare earth metals.
Innovation Solution
Development of proteins with enhanced selectivity, such as Hans-LanM, which are truncated and dimerize upon metal binding, allowing for improved separation of rare earth metals through all-aqueous chemistry in fewer stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrometallurgical liquid-liquid extraction methods are used for rare earth separation, then separation can be achieved, but the process requires dozens or hundreds of stages and uses toxic phosphonate extractants and organic solvents like kerosene
Solution Approach 1:
The patent modifies the amino acid sequence of lanmodulin proteins to change their binding parameters. Specifically, mutations are introduced to enhance affinity for heavy rare earth metals (HREs) while maintaining selectivity, allowing separation in fewer stages. The protein's binding constant and selectivity ratio are altered through rational design of the metal-binding pocket.
Solution Approach 2:
The patent creates hybrid systems combining engineered lanmodulin proteins with solid supports or surfaces to form composite materials. These protein-based adsorbents integrate the high selectivity of biological recognition with the mechanical stability of solid matrices, enabling single-stage or few-stage separation processes that replace conventional multi-stage liquid-liquid extraction.
2Reliability
If conventional hydrometallurgical methods are used for rare earth separation, then separation can be achieved, but toxic phosphonate extractants and organic solvents are required
Solution Approach 1:
The patent replaces the chemical extraction mechanism (using toxic phosphonate extractants and organic solvents) with a biological recognition mechanism. Engineered lanmodulin proteins use evolved amino acid sequences to selectively bind rare earth metals through coordinate covalent bonding, eliminating the need for hazardous chemicals while maintaining high separation effectiveness.
Solution Approach 2:
The patent employs proteins that can be produced recombinantly and used as single-use or limited-use adsorbents. These protein-based materials can be disposed of or regenerated without the environmental persistence concerns associated with conventional organic extractants, reducing long-term environmental impact.
3Quantity of substance
If Mex-LanM is used for rare earth binding, then lanthanide uptake is facilitated, but selectivity between light and heavy rare earth metals is insufficient
Solution Approach 1:
The patent introduces localized mutations in the metal-binding pocket of lanmodulin to create distinct binding characteristics. By modifying specific amino acid residues that directly coordinate rare earth metals (such as those in the EF-hand motifs), the protein achieves differential affinity for LREs versus HREs. The local chemical environment around the binding site is tailored to match the ionic radius and coordination preferences of target metals.
Solution Approach 2:
The patent exploits the dynamic conformational changes that occur upon metal binding. Engineered lanmodulin proteins exhibit enhanced conformational response to HREs compared to LREs, with larger changes in circular dichroism signals and fluorescence properties. This dynamic behavior provides a readout mechanism for selective binding and can be exploited for separation processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Hans-LanM proteins demonstrate enhanced selectivity and stability, enabling efficient separation of rare earth metals, particularly light over heavy metals, in a single-stage process with reduced environmental impact.
Implementation Method 1
The separation of these 15 elements is complicated by the similar physicochemical properties of their predominating +III ions... Mex-LanM favors the larger and more abundant light REs (LREs), especially LaIII-SmIII, over heavy REs (HREs)... Hans-LanM proteins demonstrate enhanced selectivity and stability, enabling efficient separation of rare earth metals
Implementation Method 2
Mex-LanM is a small (12-kDa), monomeric protein that undergoes a selective conformational response to picomolar concentrations of lanthanides and actinides
Data Source
AI summary
Provided are proteins that bind rare earth metals. The proteins may have enhanced REE/REE selectivity. The proteins may have four EF hand motifs each having 11, 12, or 13 amino acids residues. Each EF hand motif is separated by 12 or 13 amino acid residues, where each amino acid residue is any canonical amino acid residue and at least one amino acid residue is a hydrophobic amino acid residue. When the EF hand motif has 12 amino acid residues, the motif may have the following sequence: X1-X2-X3-X4-X5-X6-X7-X8-X9-X10-X11-E. Also provided are devices and kits comprising a protein of the present disclosure. Also provided are methods of using the proteins and devices.