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L2769

Sigma-Aldrich

Lectin from Phaseolus vulgaris (red kidney bean)

Leucoagglutinin PHA-L, lyophilized powder

Synonym(s):

Phaseolus vulgaris agglutinin, PHA

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About This Item

UNSPSC Code:
12352202
NACRES:
NA.32

biological source

Phaseolus vulgaris

Quality Level

200

form

lyophilized powder

potency

erythroagglutination activity (Does not agglutinate a 2% suspension of human erythrocytes at <62.5 μg lectin/ml.)
≤1.0 μg/mL leucoagglutination activity
≤5 μg/mL mitogenic activity

composition

Protein, ≥60% biuret

impurities

salt, free

storage temp.

2-8°C

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General description

Phytohemagglutinin (PHA) derived from Phaseolus vulgaris is a tetrameric glycoprotein. It consists of two different subunits, that weighs 120 kDa.

Application

Lectin from Phaseolus vulgaris (red kidney bean) has been used:
  • as a positive control in ELISPOT (enzyme-linked immunospot) assay
  • to induce Th2 polarization for T-cell differentiation in vitro
  • as controls in the lymphocyte proliferation assays

Biochem/physiol Actions

PHA consists of two molecular species, an erythroagglutinin (PHA-E) which has low mitogenic activity and high erythroagglutinin activity, and leucoagglutinin (PHA-L) which has high mitogenic and leucoagglutinating activity, but very low erythroagglutinating activity.
PHA-E is not blood group specific, but agglutination can be inhibited by certain oligosaccharides. PHA-P is the protein form of PHA prior to separation and purification of erythroagglutinin and leucoagglutinin. PHA-M is the mucoprotein form. Conjugates are prepared from the corresponding purified lectins.

Preparation Note

Purified by a modification of the method of Leavitt.

Analysis Note

Agglutination activity is expressed in μg/ml and is determined from serial dilutions of a 1 mg/ml solution. This activity is the lowest concentration to agglutinate a suspension of either human erythrocytes (2% in phosphate buffered saline, pH 6.8) or human leukocytes (107 per mL in saline) after 1 hr incubation at 25 °C.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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