Size: 5mL
GenScript Protein G Resin is an affinity chromatography medium designed for easy, one-step purification of classes, subclasses and fragments of immunoglobulins from biological fluids and cell culture media.
Description
Protein G Resin can also be used for immunoprecipitation of proteins, protein complexes or antigens.
The recombinant protein G ligand is coupled to 4% highly cross-linked agarose. The static binding capacity of Protein G Resin is over 20 mg goat IgG/ml settled resin. The dynamic binding capacity will vary depending on several factors such as target antibody, flow rate etc.
Key Features
- Broad IgG binding spectrum
- Binding specificity complements of protein A
- Agarose media
- No specific albumin binding
- Optimized homogeneous recombinant ligand
- High capacity
Protein G, a bacterial cell wall protein isolated from group G Streptococci, binds to mammalian IgGs mainly through Fc regions. Native protein G has 3 IgG binding domains and also sites for albumin and cell-surface binding. The latter have been eliminated from recombinant protein G to reduce nonspecific binding. Although protein G has very similar tertiary structures to protein A, their amino acid compositions differ significantly, resulting in different binding characteristics. Protein G can be used for purification of mammalian monoclonal and polyclonal IgGs that do not bind well to protein A. Protein G has greater affinity than protein A for most mammalian IgGs, especially for certain subclasses including human IgG3, mouse IgG1 and rat IgG2a. Unlike protein A, protein G does not bind to human IgM, IgD and IgA.
Storage: Store at 2-8°C, do NOT freeze.
Note: High temperature heating is not recommended. The agarose melts above 65°C.
Specifications
Ligand |
Recombinant Streptococcal Protein G lacking the albumin-binding produced in E. coli |
Number of IgG binding sites per ligand |
3 |
MW of ligand |
Approximately 22 kDa |
PI of ligand |
4.69 |
Degree of substitution |
Approximately 2 mg protein G/ml settled resin |
Static binding capacity |
>20 mg goat IgG/ml settled resin |
Matrix spherical |
agarose, 4% cross-linked |
Average particle size |
90 μm (45-165 μm) |