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Protein Engineering of Recombinant Human Bone Morphogenetic Protein 2 With Higher Interaction With Ca Phosphate Based Scaffold Used for Osteogenesis Publisher Pubmed



Bayat M1 ; Shojaei S2 ; Bahrami N1, 3 ; Mohamadnia A4, 5 ; Shojaei P6 ; Bahrami N1, 3
Authors
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Authors Affiliations
  1. 1. Oral and Maxillofacial Surgery Department, School of Dentistry, Tehran University of Medical Sciences, Craniomaxillofacial Research Center, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Gandhi Hospital, Cell Therapy Center, Tehran, Iran
  3. 3. Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Virology Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
  5. 5. Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  6. 6. Department of Chemistry, Shahid Chamran University, Ahvaz, Iran
  7. 7. Psychiatry, University of California, San Diego, United States

Source: Journal of Biomedical Materials Research - Part A Published:2017


Abstract

The aim of the present study was to assess the recombinant bonemorphogenetic protein 2 (RHBMP-2) with higher substantively and solubility for use in calcium phosphate scaffolds for better release in differentiation of mesenchymal stem cells to osteoblast cells. Using bioinformatics tools, two mutations (p. L10D and p. S12E) were chosen and applied in BMP2 CDS sequence to increase interaction with calcium derived composite. The new recombinant mutated sequence (BMP2mut) was synthesized and then subcloned to expression vector pBV220. Experimental data regarded functional protein expression in E. coli. Since no modification was made in the active sites of proteins namely β-sheets and α-helixes, not only was there any change in the specific activity occurred in the specific activity of the enzyme in comparison to its commercial counterpart, but also mesenchymal osteogenesis occurred more efficient on biphasic CaP scaffold model. As we hypothesized, use of negatively charged amino acids such as aspartate and glutamate in protein loops increased the interactions of BMP2-Ca2+ and resulted in its slower and more sustained released from CaP scaffolds compare to commercial RHBMP2. Our data suggested that new BMP2mut have greater osteoinductive capacity than RHBMP2 in the same time and dose than RHBMP2. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2799–2805, 2017. © 2017 Wiley Periodicals, Inc.