Proteins & Enzymes
(1,4-β-Xylan xylohydrolase, EC 18.104.22.168)
From Trichoderma viride
Activity: 5 U/vial
Unit Definition: One unit is defined as the amount of enzyme required to liberate 1 μmole of p-nitrophenol from p-nitrophenyl-α-D-xylopyranoside per minute at 37°C, pH 4.0.
Tryptase (Purified Antigen)
Tryptase is a glycoprotein released from mast cells during anaphylaxis, which performs a number of functions including catalyzing the activation of complement C3, converting prostromelysin to stromelysin (MMP-3), and cleaving fibrinogen resulting in a loss of clotting potential. Human tryptase is a major secretory protease of human lung mast cells.
Protein G (Recombinant)
Protein G is a monomeric protein lacking cysteine residues. Recombinant Protein G is a highly stable surface receptor that is capable of binding the Fc portion of immunoglobulins, especially IgGs from a large number of species. Preparation:Protein G is from Streptococcus sp.expressed in E. coli.
Protein A (Recombinant)
Recombinant protein A binds immunoglobulins (primarily IgG) at the Fc region with high affinity. In some cases, IgM and IgA will also bind. This property provides a rapid, simple and economical method for purification and analysis of a broad-spectrum of antibodies. Fractionation of IgG subclasses can also be performed using recombinant protein A. Because of its high affinity for immunoglobulins of many species and its low level of non-specific binding, recombinant protein A is useful for the study of cell surface antigens and receptors, and for detecting antibody-secreting cells. Recombinant protein A is produced in an E. coli strain which contains the gene for mature protein A from Staphylococcus aureus Cowan I strain.
Peroxidase-Conjugated Protein A
Product is a conjugate of Protein A and highly purified (Rz >3.0) horseradish peroxidase. This product is a conjugate of Protein A and highly purified (Rz >3.0) horseradish peroxidase. Protein A is a component of the cell wall of Staphylococcus aureus (Cowan 1 Strain), and binds to the Fc portion of immunoglobulin molecules of most mammalian species. It is composed of a single polypeptide chain of molecular weight 42,000. Protein A binds IgG molecules and, in some cases, IgM and IgA.
Phytohemagglutinin (Pha), Phaseolus Vulgaris
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 the blood from different individuals.
Neurofilament 68kDa, Purified
Neurofilaments are the 10 nanometer (10nm) intermediate filaments found specifically in neurons. The subunits of neurofilaments are related structurally to the 10nm or intermediate filaments of other tissues such as the keratin subunits, which make 10nm filaments expressed specifically in epithelia. This is a highly purified protein preparation for use as a high molecular weight marker (68kDa), as a standard, or as an antigen for various research purposes.
Purified Mouse Transferrin
Product is the lyophilized powder of mouse transferrin and buffer salts. Mouse transferrin is purified from pooled mouse serum using multi-step procedures which may include salt fractionation, gel filtration, ion-exchange chromatography and immunoabsorption.
Mouse Albumin Fraction V
Product is the lyophilized powder of mouse albumin Fraction V and buffer salts. Product is the lyophilized powder of mouse albumin Fraction V and buffer salts. Mouse albumin Fraction V is purified from pooled mouse serum using multi-step procedures which may include salt fractionation, gel filtration and ion-exchange chromatography. The product is dialyzed into 0.01M sodium phosphate, 0.07M sodium chloride, pH 7.3, filtered through a 0.22 µm filter, vialed and lyophilized.
Pure Pokeweed Mitogen (Phytolacca Americana)
Product lectin is pure Phytolacca americana from Pokeweed. Pure pokeweed mitogen is used in mitogenic assays. It has variety of applications in vitro like blood grouping and erythrocyte polyagglutination studies, mitogenic stimulation of lymphocytes, lymphocyte subpopulation studies, fractionation of cells and other particles, histochemical studies of normal and pathological conditions. Pokeweed mitogen has specificity for sugar chains containing a di-N-Acetylchitobiose moiety such as is found on "band-3 glycoprotein" from human erythrocytes. Di-N-acetylchitobiose and tri-N-acetylchitobiose inhibit agglutination activity of the lectin.
Human High Density Lipoprotein (HDL)
Human High Density Lipoprotein. HDL is isolated from fresh human serum by sequential isopycnic ultracentrifugation at the lower and upper density limits of the specified density range. Density adjustments are performed with solid KBr. HDL is washed by centrifugation at the upper density limit to ensure removal of higher density proteins. HDL is filtered through a 0.45 µm filter and packaged aseptically.
Wheat Germ Agglutinin 5 mg
Wheat germ agglutinin (WGA) is one of the most widely used lectins in cell biology. The receptor sugar for WGA is N-acetylglucosamine, with preferential binding to dimers and trimers of this sugar. WGA can bind oligosaccharides containing terminal N-acetylglucosamine or chitobiose, structures which are common to many serum and membrane glycoproteins. Bacterial cell wall peptidoglycans, chitin, cartilage glycosaminoglycans, and glycolipids can also bind WGA. Native WGA has also been reported to interact with some glycoproteins via sialic acid residues (see succinylated WGA).