当前位置： SCI文献检索 > INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES期刊下所有文献 > Molecular cloning of a small heat shock protein (sHSPII) from the cattle tick Rhipicephalus (Boophilus) annulatus salivary gland.

Molecular cloning of a small heat shock protein (sHSPII) from the cattle tick Rhipicephalus (Boophilus) annulatus salivary gland.

Abstract：

:Immunoscreening of a cDNA expression library of the Rhipicephalus (Boophilus) annulatus tick with purified rabbit anti-R annulatus salivary glands antigens polyclonal antibodies led to the identification of a 661bp sequence. The sequence includes an open reading frame of 543bp encoding a protein of 180 amino acids with calculated molecular weight of 20.51kDa, isoelectric point of 9.071 and with no signal sequence. Comparison of the deduced amino acids with protein data bank showed that the identified polypeptide belongs to the alpha crystallin small heat shock proteins superfamily and shows sequence similarity of 62% and 55% to Ixodes scapularis fed tick salivary gland protein and Ornithodoros parkeri alpha-crystallin protein, respectively. Accordingly, this protein was called Ra-sHSPII. The Ra-sHSPII protein was expressed in E. coli under T7 promotor of the pET-30b vector, purified under denaturation conditions and the immunogenicity and cross-reactivity of the recombinant Ra-sHSPII were evaluated. Direct ELISA showed that the Ra-sHSPII is a strong immunogen. In immunoblotting assay the anti-rRa-sHSPII antisera reacted specifically with purified rRa-sHSPII, with several proteins in R. annulatus whole tick, larval and gut protein extracts in addition to Hyalomma dromedarii and Ornithodoros moubata whole tick protein extracts, as examples of hard and soft tick species, respectively. The rRa-sHSPII protein confers thermal protection to other proteins in vitro as found in other sHSPs. E. coli cell extracts containing the protein were protected from heat-denatured precipitation when heated up to 100°C, whereas extracts from cells not expressing the protein were heat-sensitive at 60°C.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Shahein YE,El-Rahim MT,Hussein NA,Hamed RR,El-Hakim AE,Barakat MM

doi

10.1016/j.ijbiomac.2010.08.006

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

614-22

issue

5

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(10)00254-0

journal_volume

47

pub_type

杂志文章

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