Bioinformatic Investigation of Protein Stability (SQS) in Prokaryotes and Eukaryotes

Document Type : Research Paper

Authors

1 Ph.D. Student of Agricultural Biotechnology, Biotechnology and Life Science Department, Shahid Beheshti University , Tehran, Iran

2 Department of Cell and Molecular Biology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran.

3 Department of Agricultural Engineering, Research Institute of Medicinal Plants and Raw Materials, Shahid Beheshti University, Tehran, Iran.

Abstract

Squalane is an unsaturated triterpene that has wide applications in pharmaceuticals. In this research, the production of squalene and its bioinformatic analysis in four species of unicellular and multicellular eukaryotes and prokaryotes were investigated in order to determine the difference of this gene in eukaryotes and prokaryotes. The results of phylogenetic analysis showed that algae as multicellular eukaryotes, yeast as single-celled eukaryote and bacteria as single-celled prokaryote were placed in one group and plants were placed in a separate group. GC percentage of SQS protein was evaluated by GC Content Calculator, as well as aliphatic index and instability index by protparam. The results showed that the SQS gene is in a range from unstable to stable. The analysis of the presence of signal sequences and the analysis of the detection of the final location of the protein showed that the possibility of transferring the SQS protein to the mitochondria, chloroplast and secretory pathway is very low and it is not among the signal proteins. It was also found in Gymnema sylvestre that this protein has three protected domains. The comparison of the secondary structure of the protein confirmed the existence of alpha sheets. 3D modeling of this protein in plant was done by homology modeling method and using Swiss Model database after selecting a suitable model with high similarity which was extracted from PDB database. In order to validate the structure of the drawn three-dimensional model and stereochemical analysis, the Ramachandran diagram was drawn and the dihedral angles were calculated. The results of structural quality evaluation showed that the proposed models have good quality and stability. The study of the protein structure can help to understand the function of the protein, and studying the details of its structure can be useful in the studies of the active site of the protein and docking.

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References

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