Recombinant streptavidin from streptomyces avidinii, produced in E.coli. Biotin, a 244Da vitamin (Vitamin H) molecule, exhibits an extraordinary binding affinity for streptavidin (Ka=10 15 M -1 ). Biotin and streptavidin interaction is rapid and once the bond is established it can survive up…

Aprotinin is a protein consisting of 58 amino acids, arranged in a single polypeptide chain that is crosslinked by three disulfide bridges. Aprotinin is found in bovine lymph nodes, lung, parotid gland, spleen, liver, pancreas, seminal vesicles, thyroid gland, kidney, mucous membranes of the…

Crude Phaseolus vulgaris-P lectin (PHA-P) from the Red Kidney Bean. Phytohemagglutinin PHA agglutinates the erythrocytes of all human blood groups as well as those of rabbit, dog, cat, mouse, sheep, and guinea pig. The optimal amount of PHA required for the agglutination of erythrocytes varies with…

Lectins are proteins or glycoproteins of non-immune origin that agglutinate cells and/or precipitate complex carbohydrates. Lectins are capable of binding glycoproteins even in presence of various detergents. The agglutination activity of these highly specific carbohydrate-binding molecules is…

EC 3.1.1.4 Active enzyme isolated from bee venom One unit of enzyme hydrolyzes one µmol of Diheptanoyl Thio-PC per minute at 25°C PLA2 catalyzes the hydrolysis of fatty acids at the sn-2 position of glycerophospholipids, yielding a free fatty acid and a lysophospholipid. PLA2…

Avidin is a basic glycoprotein consisting of four essentially identical subunits. The combined molecular weight of the subunits is about 66,000. Each subunit is a single polypeptide chain containing 128 amino acid residues with alanine at the N-terminal, glutamic acid at the C-terminal, and a…

Arginine-rich subgroup. Commonly used for chromosome-reconstitution studies. Suitable substrate for protein kinase C.

Apoferritin is the Protein shell of ferritin. Calibration of gel filtration columns and sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis Acts as an anti-oxidant When added to cultured endothelial cells apoferritin is taken up in a dose-responsive manner and appears to…

Avidin is a basic glycoprotein isolated from raw egg white. It exhibits high binding affinity for biotin and is capable of producing biotin deficiency in rats and chicks. It also occurs in the white portion of eggs and the oviducts of birds and amphibia. It is destroyed by cooking or irradiation. …