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Title: Recombinant American cockroach component, Per a 1, reactive to IgE of allergic Thai patients
Authors: Pornphan Diraphat
Nitat Sookrung
Wanpen Chaicumpa
Phanuvich Pumhirun
Pakit Vichyanond
Pramuan Tapchaisri
Thareerat Kalambaheti
Yuvadee Mahakunkijchareon
Yuwaporn Sakolvaree
Chaweewan Bunnag
Mahidol University
Thammasat University
Phramongkutklao College of Medicine
Keywords: Immunology and Microbiology
Issue Date: 1-Mar-2003
Citation: Asian Pacific Journal of Allergy and Immunology. Vol.21, No.1 (2003), 11-20
Abstract: Twelve similar recombinant Per a 1 clones were produced from an American cockroach (CR) cDNA library. The nucleotide sequence of a representative cline, i.e. clone A6, contained 579 base pairs (bp) and a 372 bp open reading frame (2-373) encoding 124 amino acids. A stop codon was found at position 374-376 followed by a 3′ end untranslated region with an AATAAA polyadenylation signal and a poly (A) tail. The estimated molecular mass of the 24 amino acid residue protein was 13.8 kDa, with a predicted isoelectric point value of 4.74. Cysteine or N-linked glycosylation was not found. The deduced amino acid sequence of the A6 revealed 84.68-95.97% identity to other previously reported Per a 1 clones and 65.87-69.60% homology to the previously reported Bla g 1 clones. However, while previously reported Per a 1 clones showed homology to ANG12, a precursor protein in the midgut of the female Anopheles gambiae secreted after the blood meal, the A6 DNA sequence was found to have homology (37.1 %) to DNA of G2, a putative protein in the midgut of Aedes aegypti (AY 050565). The deduced amino acid sequence of A6 contained a mitochondrial energy transfer protein signature, phosphorylation sites for the cAMP-and cGMP-dependent protein kinase C and casein kinase II. Hydrophobic and hydrophitic characteristics of the A6 deduced peptide indicated that it was a transmembrane protein. This is the first report that Per a 1 is a transmembrane protein. The deduced amino acid sequence of the A6, which contained the sequence LIRSLFGLP, differed in one amino acid from two previously reported epitopes, i.e. LIRALFGL and IRSWFGLP, of Per a 1.0104 which bound 80% and 100%, respectively, to IgE of the allergic patients tested. The A6 DNA sequence was deposited in the GenBank (Accession number AY 259514) and has been designated Per a 1.0105. The A6 expressed protein bound to monoclonal antibodies (MAb 3C2) specific to American cockroach and also bound to IgE of all (100%) of the 20 allergic Thai patients.
ISSN: 0125877X
Appears in Collections:Scopus 2001-2005

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