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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Expression, purification and structural analysis of recombinant rBdh-2His6, a spermadhesin from buck (Capra hircus) seminal plasma

Antônia Sâmia F. Nascimento A , João B. Cajazeiras A , Kyria S. Nascimento A , Sara Monalisa S. Nogueira A , Bruno L. Sousa A , Edson H. Teixeira A , Luciana M. Melo B , Rodrigo Maranguape S. da Cunha A , André Luiz C. Silva A and Benildo S. Cavada A C
+ Author Affiliations
- Author Affiliations

A Laboratório de Moléculas Biologicamente Ativas (Biomol-Lab), Department of Biochemistry and Molecular Biology, Federal University of Ceará, Av. Humberto Monte s/n, Bloco 907, Lab. 1075, Campus do Pici, Fortaleza-CE 60440-970, Brazil.

B Laboratório de Fisiologia e Controle da Reprodução (LFCR), State University of Ceará, Faculty of Veterinary, Av. Dedé Brasil, 1700, Fortaleza-CE 60740-930, Brazil.

C Corresponding author. Email: bscavada@ufc.br

Reproduction, Fertility and Development 24(4) 580-587 https://doi.org/10.1071/RD11154
Submitted: 9 June 2011  Accepted: 3 October 2011   Published: 22 November 2011

Abstract

Spermadhesins, a family of secretory proteins from the male genital tract of ungulate species, belong to the group of animal lectins. Spermadhesins have a prominent role in different aspects of fertilisation, such as spermatozoid capacitation, acrosomal stabilisation, sperm–oviduct interaction and during sperm–oocyte fusion. Proteins (spermadhesins) in buck seminal plasma were described. In the present study, bodhesin Bdh-2 cDNA present in buck seminal plasma was subcloned with the expression plasmid pTrcHis TOPO used to transform Escherichia coli Top10 One shot cells. The recombinant clones were selected by growth in 50 µg mL–1 ampicillin-containing LB broth and polymerase chain reaction amplification. Recombinant rBdh-2His6 synthesis was monitored by sodium dodecyl sulfate–polyacrylamide gel electrophoresis and followed by immunoblotting using monoclonal anti-His antibody. Production of rBdh-2 using low temperatures was not satisfactory. Greater production of rBdh-2 occurred with 1.5 mM isopropyl β-d-thiogalactoside after 2 h of induction. The method used to purify rBdh-2 was affinity chromatography on a His-Trap column following ion-exchange chromatography on a DEAE-Sephacel column. The secondary structure of the rBdh-2His6 was evaluated by spectral profile circular dichroism (CD). The prevalence of secondary structures like β-sheets, with fewer unfolded structures and α-helices, was confirmed. The structure of rBdh-2His6 remained stable up to 35°C. However, significant structural changes were observed at temperatures higher than 40°C related to a distortion of the CD spectrum.

Additional keyword: bodhesin.


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