Description
GoldBio’s Nickel Agarose Beads (High Density) are a ready-to-use immobilized metal affinity chromatography resin for rapid purification of His-tagged recombinant proteins. The resin provides a binding capacity greater than 25 mg/mL when evaluated with an approximately 60 kDa protein, making it well suited for experiments that require increased protein yield from a limited resin volume.
Proteins can be purified under native conditions when preservation of structure and activity is important, or under denaturing conditions when recovering His-tagged proteins from insoluble fractions or inclusion bodies.
The resin is constructed from cross-linked agarose bearing iminodiacetic acid (IDA) groups attached through stable ether linkages and a spacer arm. IDA acts as a tridentate chelator that coordinates Ni2+, leaving available coordination sites for interaction with exposed histidine residues on polyhistidine-tagged proteins. Surface histidines and cysteines can also interact with immobilized transition metal ions, although engineered polyhistidine tags provide the selective binding used for recombinant protein purification.
Nickel Agarose Beads (High Density) can be used for batch purification, gravity-flow chromatography, and FPLC purification at pressures no greater than 20 kPa.
Excessive pressure or overly rapid flow can reduce performance, so controlled flow conditions are important when packing or operating a column. The resin is compatible with GoldBio’s His-Tag Buffer Set and can be used with common imidazole-based binding, washing, and elution strategies.
Note: Some discoloration of the Nickel IDA resin has been observed in reaction with low levels of reducing agents such as DTT. However, the resin remains fully functional even at concentrations as high as 5mM DTT.
Mechanism
Nickel Agarose Beads (High Density) function through immobilized metal affinity chromatography. Nickel ions are coordinated by IDA groups covalently attached to the cross-linked agarose matrix.
The imidazole side chains of histidine residues within a polyhistidine tag coordinate with the immobilized nickel ions, retaining the tagged protein while many untagged contaminants pass through or are removed during washing.
Low concentrations of imidazole may be included in binding and wash buffers to reduce nonspecific interactions. The target protein is commonly eluted with a higher imidazole concentration, which competes with histidine residues for nickel coordination sites. Alternative elution approaches include lowering the pH or, when appropriate, stripping the immobilized nickel with a chelating agent prior to resin regeneration.
Common Applications
(Click each for more information)
High-Capacity Purification of His-Tagged Recombinant Proteins
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Purpose: To rapidly isolate polyhistidine-tagged recombinant proteins from crude biological samples while maximizing protein recovery per milliliter of resin.
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How It Works: The His-tag coordinates with nickel ions immobilized on IDA agarose. Untagged proteins are removed during washing, and the bound target is typically recovered by competitive elution with imidazole.
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Applications: Purification of recombinant enzymes, antigens, binding proteins, and other His-tagged proteins expressed in bacterial, yeast, insect, or mammalian systems.
Bornhorst, J. A., & Falke, J. J. (2000). Purification of proteins using polyhistidine affinity tags. Methods in Enzymology, 326, 245–254. https://doi.org/10.1016/S0076-6879(00)26058-8
Purification Under Native Conditions
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Purpose: To recover soluble His-tagged proteins while preserving native conformation, biological activity, and protein complexes when possible.
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How It Works: His-tagged proteins bind the nickel-charged resin in non-denaturing buffers. Controlled salt, pH, and imidazole concentrations support selective binding and washing, while competitive elution with imidazole allows recovery of the target protein under non-denaturing conditions.
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Applications: Enzyme activity studies, ligand-binding assays, structural characterization, and preparation of functional recombinant proteins.
Gaberc-Porekar, V., & Menart, V. (2001). Perspectives of immobilized-metal affinity chromatography. Journal of Biochemical and Biophysical Methods, 49(1–3), 335–360. https://doi.org/10.1016/S0165-022X(01)00207-X
Purification Under Denaturing Conditions
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Purpose: To isolate His-tagged proteins from insoluble fractions or inclusion bodies when native extraction does not provide adequate recovery.
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How It Works: Polyhistidine tags can retain affinity for immobilized nickel in buffers containing denaturants such as urea or guanidine hydrochloride, allowing purification before refolding or downstream analysis.
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Applications: Inclusion body recovery, purification of aggregation-prone proteins, denaturing purification, and protein refolding studies.
Block, H., Maertens, B., Spriestersbach, A., Brinker, N., Kubicek, J., Fabis, R., Labahn, J., & Schäfer, F. (2009). Immobilized-metal affinity chromatography (IMAC): A review. Methods in Enzymology, 463, 439–473. https://doi.org/10.1016/S0076-6879(09)63027-5
Protein Characterization and Structural Biology
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Purpose: To prepare sufficiently enriched recombinant proteins for biochemical, biophysical, and structural analyses.
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How It Works: Selective capture of a His-tagged target reduces host-cell contaminants and concentrates the protein before polishing steps or direct analysis.
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Applications: Enzyme kinetics, protein structural studies, spectroscopy, binding analysis, antibody production, and assay development.
Terpe, K. (2003). Overview of tag protein fusions: From molecular and biochemical fundamentals to commercial systems. Applied Microbiology and Biotechnology, 60(5), 523–533. https://doi.org/10.1007/s00253-002-1158-6
Parallel Expression Screening and Scale-Up
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Purpose: To compare multiple expression constructs or purification conditions and then scale promising candidates to larger preparations.
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How It Works: His-tag affinity purification can be performed in batch, column, or automated formats, allowing the same binding principle to be applied across small screening samples and larger protein preparations.
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Applications: Expression clone screening, optimization of induction conditions, small-scale purification, process development, and recombinant protein production.
Arnau, J., Lauritzen, C., Petersen, G. E., & Pedersen, J. (2006). Current strategies for the use of affinity tags and tag removal for the purification of recombinant proteins. Protein Expression and Purification, 48(1), 1–13. https://doi.org/10.1016/j.pep.2005.12.002
Key Benefits
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High Binding Capacity: Provides greater than 25 mg/mL binding capacity with an approximately 60 kDa protein, supporting higher recovery from a smaller resin volume.
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Native and Denaturing Compatibility: Supports purification of soluble proteins under native conditions and recovery of insoluble His-tagged proteins under denaturing conditions.
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Ready-to-Use Nickel IDA Resin: Nickel-charged IDA groups are covalently attached to cross-linked agarose, allowing immediate use for His-tag protein purification.
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Flexible Purification Formats: Compatible with batch binding, gravity-flow columns, and FPLC operation at pressures no greater than 20 kPa.
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DTT Tolerance: The resin remains fully functional with DTT concentrations up to 5 mM, although discoloration may occur.
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Buffer System Compatibility: Works with GoldBio’s His-Tag Buffer Set and common imidazole-based purification conditions.
Storage/Handling
Store at 4°C. Do NOT freeze.
Suitable for FPLC use at pressures no greater than 20 kPa. Excessive pressure or overly rapid flow can diminish resin performance.
For research use only. Not for food, drug, household, or cosmetic use.
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