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Cloning and sequence analysis of a cDNA encoding Pso o II, a mite group II allergen of the sheep scab mite (Acari: Psoroptidae)

Cloning and sequence analysis of a cDNA encoding Pso o II, a mite group II allergen of the sheep scab mite (Acari: Psoroptidae)

Journal of Medical Entomology 39(2): 384-391

ISSN/ISBN: 0022-2585

PMID: 11931040

DOI: 10.1603/0022-2585-39.2.384

Psoroptes ovis (Hering), the sheep scab mite, is responsible for psoroptic scabies of cattle and sheep. Reverse translation of 30 N-terminal amino acids of the major P. ovis allergen, previously chosen as a candidate immunogen and identified as a 16 kDa protein yielded a degenerate sequence used to design oligodeoxynucleotide polymerase chain reaction (PCR) primers. Use of the PCR primers with a P. ovis cDNA library succeeded in amplification of a 90 bp cDNA gene fragment that was cloned, sequenced, and used to select unique sequencing/PCR primers. Primer walking generated overlapping subclones which yielded the 588 nucleotide consensus sequence of the cDNA encoding the 143 amino acid P. ovis allergen precursor. Nucleotide and translated sequences of the cDNA were compared with sequences in GenBank and found to be homologous to mite group II allergens Lep d II (formerly Lep d I) of Lepidoglyphus destructor Schrank, DerfII of Dermatophagoides farinae Hughes, Der p II of Derrmatophagoides pteronyssinus (Trouessart), Tyr p II of Tyrophagus putrescentiae (Schrank), Eur m II of Euroglyphus maynei (Cooreman) and Gly d II of Glycophagus domesticus (De Geer). The mature P. ovis allergen is composed of 126 amino acids with a calculated molecular mass of 13,468 Da, three disulfide bonds, and pI of 6.06 with one potential o-glycosylation site at Thr116. We designate the P. ovis 16 kDa protein as Pso o II in conformity with nomenclature for mite group II allergens.

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Accession: 003681510

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