Recombinant Enterobacter agglomerans Mercuric transport protein (merT)
Description
Operon Structure and Genetic Context
The mer operon in Enterobacter agglomerans includes genes merRTPCADE, where merR regulates operon expression, and merC enhances Hg²⁺ transport efficiency . Comparative studies show:
| Species | Operon Composition | Key Transport Proteins | Resistance Spectrum |
|---|---|---|---|
| Enterobacter agglomerans | merRTPCADE | merT, merP, merC | Broad (Hg²⁺ + organics) |
| Pseudomonas fluorescens | merRTPADE | merT, merP, merD | Narrow (Hg²⁺ only) |
Bioremediation Potential
Recombinant merT has been explored for enhancing mercury uptake in engineered bacteria. For example, Pseudomonas pseudoalcaligenes strains overexpressing merT showed improved Hg²⁺ bioremediation capacity in marine environments . In Enterobacter sp. YSU, the cloned merRTPCADE operon conferred resistance to 150 µM HgCl₂, highlighting its applicability in heavy-metal contaminated sites .
ELISA and Bioassay Tools
Recombinant merT is used in enzyme-linked immunosorbent assays (ELISA) to study mercury transport mechanisms and monitor environmental mercury levels. Key specifications for commercial ELISA kits include:
| Parameter | Detail | Source |
|---|---|---|
| Protein Quantity | 50 µg per vial | |
| Purity | >90% (SDS-PAGE validated) | |
| Storage | -20°C/-80°C (with aliquoting recommended) |
Phylogenetic Analysis
Phylogenetic studies using MEGA 7 software reveal that Enterobacter merT clusters with other Enterobacteriaceae proteins, distinct from Pseudomonadaceae homologs . This divergence reflects species-specific adaptations in mercury resistance mechanisms.
Mechanistic and Comparative Data
The Hg²⁺ transport pathway involves sequential interactions:
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merP binds Hg²⁺ in the periplasm.
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merT transfers Hg²⁺ to the inner membrane.
In contrast, organomercurial lyase (merB) cleaves carbon-mercury bonds, making merB-containing operons effective against methylmercury and phenylmercury . The absence of merB in some Stenotrophomonas strains limits their organomercury resistance .
Challenges and Future Directions
While recombinant merT enhances bacterial mercury tolerance, challenges include:
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Operon instability: Horizontal gene transfer risks environmental spread of mercury resistance.
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Tag interference: His-tagged variants may alter transport efficiency .
Future research may focus on optimizing merT expression in bioengineered systems or developing tag-free variants for improved bioremediation efficacy.
Product Specs
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