Abcam, ab181700, Anti-Protein G antibody

Size: 100µg
Rabbit Polyclonal Protein G antibody. Suitable for WB, IHC-P and reacts with Streptococcus sp. 'group G' samples. Cited in 1 publication. Immunogen corresponding to Native Full Length Protein corresponding to Streptococcus sp. 'group G' spg.
Key facts
Host species:Rabbit,
Clonality:Polyclonal,
Isotype:IgG,
Carrier free:No,
Reacts with:Streptococcus sp. 'group G',
Applications:WB, IHC-PSee reactivity dataSee the reactivity data table below for information on validated species and application combinations.,
Immunogen:Native Full Length Protein corresponding to Streptococcus sp. 'group G' spg.P19909,
Specificity:No cross reactivity occurs against Protein A.

Properties and Storage Information:
Form-Liquid, Purity-IgG fraction, Purification technique-Ion exchange chromatography, Purification notes-Anti-Protein G is an IgG fraction antibody purified from monospecific antiserum by a multi-step process which includes delipidation, salt fractionation and ion exchange chromatography followed by extensive dialysis against the buffer., Storage buffer-Preservative: 0.01% Sodium azide Constituents: 0.88% Sodium chloride, 0.424% Potassium phosphate solution, Shipped at conditions-Blue Ice, Appropriate short-term storage duration-1-2 weeks, Appropriate short-term storage conditions-+4°C, Appropriate long-term storage conditions--20°C, Aliquoting information-Upon delivery aliquot, Storage information-Avoid freeze / thaw cycle

Supplementary Information:
This supplementary information is collated from multiple sources and compiled automatically.
Protein G also known as IgG-binding protein is a cell wall protein from Streptococcus species. This protein weighs approximately 22 kDa which you might also know as protein G molecular weight (protein G MW). Protein G size allows it to bind specifically to immunoglobulin G (IgG) and other subclasses. Researchers often clone and express protein G recombinantly resulting in wide availability of recombinant protein G. Its expression primarily occurs in bacterial cell cultures for easy purification and use in laboratory research.
Biological function summary
Protein G plays a role in immune evasion by binding to the Fc region of IgG antibodies. This binding limits the immune system's ability to clear bacterial infections by preventing antibody-mediated opsonization and phagocytosis. Protein G can also form part of a larger immobilization complex in various experimental setups aiding in the purification and detection of antibodies. Protein G HRP conjugates further extend its utility in assay systems by enabling colorimetric detection.
Pathways
The interaction between protein G and IgG significantly impacts the immune response pathways. The binding of protein G to the Fc region of IgG interferes with pathways involving IgG-mediated activation of Fc receptors on immune cells. This affects signaling pathways like ADCC (antibody-dependent cellular cytotoxicity) and phagocytosis. Protein A is another bacterial protein that binds IgG similarly though it differs in affinity and subclass specificity.
Protein G's interaction with IgG relates to conditions involving bacterial infections and immune system evasion mechanisms. It impacts conditions like bacterial endocarditis by providing bacteria a means to escape immune detection. By binding IgG and interfering with the normal immune function protein G might indirectly affect proteins such as complement components. These interactions underline the importance of understanding protein G's function in designing therapeutic interventions in bacterial infections.