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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

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

Certificates of Analysis (COA)

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