Skip to Content
MilliporeSigma
All Photos(1)

Key Documents

P4689

Sigma-Aldrich

Protein G′ from proprietary source

recombinant, expressed in E. coli, lyophilized powder

Synonym(s):

G′ protein

Sign Into View Organizational & Contract Pricing

Select a Size

100 μL
$515.00
0.2 ML
$562.52
0.5 ML
$1,090.60

$515.00


In StockDetails


Request a Bulk Order

Select a Size

Change View
100 μL
$515.00
0.2 ML
$562.52
0.5 ML
$1,090.60

About This Item

UNSPSC Code:
12352203
NACRES:
NA.46

$515.00


In StockDetails


Request a Bulk Order

recombinant

expressed in E. coli

Quality Level

conjugate

unconjugated

form

lyophilized powder

capacity

~5 mg/mg, solid binding capacity (IgG)

storage temp.

−20°C

General description

Genetically engineered truncated protein G; retains affinity for IgG, but lacks albumin- and Fab- binding sites and membrane-binding regions.[1]
Protein G is a group G Streptococcus protein and is a large multi-domain cell wall protein. It interacts with the Fc region of IgG (immunolglobulin) through its repeating 55-amino acid domain. Strain GX7809 and GX7805 contain two and three such protein repeats respectively.[2][3]

Application

Protein G has been used for the analysis of mAb (monoclonal antibody) synergy towards hCG (human chorionic gonadotropin) using surface plasmon resonance (SPR), and for serum IgG galactosylation obtained from RA (rheumatoid arthrtitis) patients and MRL-lpr mice.[4][5]

Biochem/physiol Actions

Protein G is implicated in the evasion of host defence response by Streptococcus, via its protein binding properties. It is interacts with α2-micorglobulin which is a predominant inhibitor of human plasma.[2]

Physical form

Lyophilized from water.

Disclaimer

Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

C R Goward et al.
The Biochemical journal, 267(1), 171-177 (1990-04-01)
The gene for Protein G from Streptococcus strain G148 was cloned and expressed in Escherichia coli. The regions on the gene corresponding to the albumin-binding domains and the Fab-binding region were then deleted by site-directed mutagenesis. The translation of regions
Arie Ryvkin et al.
PloS one, 7(8), e41469-e41469 (2012-08-08)
Polyclonal serum consists of vast collections of antibodies, products of differentiated B-cells. The spectrum of antibody specificities is dynamic and varies with age, physiology, and exposure to pathological insults. The complete repertoire of antibody specificities in blood, the IgOme, is
Agalactosyl IgG and beta-1,4-galactosyltransferase gene expression in rheumatoid arthritis patients and in the arthritis-prone MRL lpr/lpr mouse.
Jeddi PA et al
Immunology, 87(4), 654-659 (1996)
P A Jeddi et al.
Immunology, 87(4), 654-659 (1996-04-01)
Reduced galactosylation of immunoglobulin G (IgG) is well documented in rheumatoid arthritis (RA), but the reason for this defect is still unknown. There is some evidence supporting a defect in the biosynthetic pathway, and a reduction in the level of
Purification and some properties of streptococcal protein G, a novel IgG-binding reagent.
Bjorck L and Kronvall G
Journal of Immunology, 133(2), 969-974 (1984)

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service