PMID: 9420135Jan 7, 1998Paper

Cloning and high level expression of Cynodon dactylon (Bermuda grass) pollen profilin (Cyn d 12) in Escherichia coli: purification and characterization of the allergen

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
J A AsturiasR Palacios

Abstract

Profilin, an actin-binding protein, was previously described as a panallergen which is involved in about 20% of the crossreactivity found among pollen and food allergic patients. This allergen is usually under-represented in natural extracts used for allergy diagnosis. To obtain an immunologically active and soluble recombinant profilin from Cynodon dactylon pollen which could be used for diagnostic and therapy. Isolation of cDNA clones was performed by polymerase chain reaction amplification using degenerate primers. Expression in Escherichia coli BL21 (DE3) was carried out using vector pKN172, and the expressed product was isolated by affinity chromatography on poly L-proline-Sepharose. Four cDNA inserts coding for Cynodon dactylon (Bermuda grass) pollen profilin (Cyn d 12) were cloned and sequenced. Full-length C. dactylon profilin gene was expressed in Escherichia coli as non fusion protein. Induced cells could produce high amounts of recombinant Cyn d 12, and after a single purification step on poly (L-proline)-Sepharose, up to 45 mg of pure allergen per litre culture could be obtained. The reactivity of recombinant Cyn d 12 with IgE antibodies present in sera from Bermuda grass-allergic patients is comparable to that of t...Continue Reading

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