Abcam, ab125969, Human Protein S ELISA Kit

Size: 1 x 96Tests
Human Protein S ELISA Kit is a Competitive ELISA for the measurement of Human Protein S in Human in Biofluids samples.
Key facts
Detection method:Colorimetric,
Sample types:Plasma, Serum,
Reacts with:Human,
Assay type:Competitive,
Sensitivity:= 0.38 µg/mL,
Range:0.5 - 8 µg/mL,
Assay time:4h,
Assay Platform:Microplate

Product details:
Abcam’s Protein S Human
in vitro
competitive ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for the quantitative measurement of Human protein S in plasma and serum samples.
A Protein S specific antibody has been precoated onto 96-well plates and blocked. Standards or test samples are added to the wells and subsequently biotinylated Protein S is added and then followed by washing with wash buffer. Streptavidin-Peroxidase Complex is added and unbound conjugates are washed away with wash buffer. TMB is then used to visualize Streptavidin-Peroxidase enzymatic reaction. TMB is catalyzed by Streptavidin-Peroxidase to produce a blue color product that changes into yellow after adding acidic stop solution. The density of yellow coloration is inversely proportional to the amount of Protein S captured in plate.
The entire kit may be stored at -20°C for long term storage before reconstitution - Avoid repeated freeze-thaw cycles.

Properties and Storage Information:
Shipped at conditions-Blue Ice, Appropriate short-term storage conditions--20°C, Appropriate long-term storage conditions-Multi, Storage information-Please refer to protocols

Supplementary Information:
This supplementary information is collated from multiple sources and compiled automatically.
Protein S also known as PROS1 is a vitamin K-dependent plasma glycoprotein with a molecular mass of approximately 75 kDa. It is synthesized mainly in the liver but also found in other tissues such as the endothelium megakaryocytes and osteoblasts. This protein plays a significant role in the regulation of blood coagulation by serving as a non-enzymatic cofactor for activated protein C (APC) in the proteolytic degradation of coagulation factors Va and VIIIa.
Biological function summary
The integrated function of Protein S within the coagulation cascade cannot be overemphasized. It acts synergistically with APC to limit thrombin generation therefore facilitating anticoagulation. Protein S is part of a complex with APC that exerts a potent anticoagulant effect. While free Protein S shows functional activity a large fraction circulates in complex with C4b-binding protein where it exhibits limited cofactor activity.
Pathways
The anticoagulant role of Protein S anchors it within the critical pathways like the protein C pathway impacting hemostasis. It directly associates with proteins such as Factor Va and Factor VIIIa and indirectly with proteins like thrombin. The regulation of coagulation through these pathways highlights its contribution to maintaining vascular integrity and preventing thrombosis.
Protein S deficiency has clinical implications in thrombotic conditions including deep vein thrombosis (DVT) and pulmonary embolism (PE). Such deficiencies can be hereditary or acquired often linked to disorders affecting vitamin K metabolism or liver function. Protein C another key anticoagulant closely interacts with Protein S in these disorders highlighting their collaborative effort in preventing excessive clot formation.