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In silico analysis of codon usage and rare codon clusters in the halophilic bacteria L-asparaginase

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Abstract

L-asparagine is essential for the correct function of some neoplastic cells; in lymphoblasts, L-asparagine is converted to aspartic acid by L-asparaginase. By conversion of L-asparagine to aspartic acid through the L-asparaginase activity in the plasma, L-asparagine was depleted and resulted in inhibiting DNA synthesis and consequently cell apoptosis. Considering the special properties of this enzyme in cancer treatment, L-asparaginase has been introduced as an anti-cancer drug in chemotherapy. The molecular cloning of a new type of L-asparaginase from E. coli was reported, previously. Here, we analyze some features of this enzyme such as CUP (codon usage preference) and rare codon cluster (RCC). By modeling of L-asparaginase 3D (three-dimensional) structure, some rare codons were detected that may have an important role in the structural and functional properties of the enzyme. In the following, the properties of the substrate binding sites were studied by molecular docking technique. Their substrate binding sites were conducted by the AutoDock Vina. This analysis recognized some amino acids that had a similar structural situation with the substrate binding site of Erwinia carotovora L-asparaginase (2jk0). In this study, five rare codons of Lys195, Leu30, Lys184, Lys160, and Lys174 were identified and studied in the structure of L-asparaginase. The substrate binding site studies showed that the Asp6, Asp77, and Thr78 incorporate in the active site of the enzyme. The results of this study can improve the understanding of L-asparaginase folding and expression challenges and help in the rational design of novel drugs.

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Abbreviations

SPDBV:

Swiss-PdbViewer

E. coli :

Escherichia coli

3D:

three-dimensional

CUP:

codon usage preference

I-TASSER:

Iterative Threading ASSEmbly Refinement

PyMOL:

Python-enhanced molecular graphics tool

AutoDock:

automated docking

RCC:

rare codon clusters

NCBI:

National Center for Biotechnology Information

BLAST:

Basic Local Alignment Search Tool

GCUA:

Graphical Codon Usage Analyser

ANSI:

American National Standards Institute

Pfam:

Protein family

MSS:

Maximal Scoring Subsequences

LOMETS:

Local Meta-Threading Server

ProtParam:

protein parameters

PIC:

Protein Interactions Calculator

PDBQT:

protein Data Bank Q (partial charges) T (atom types)

MGL:

Molecular Graphics Laboratory

SDF:

Structure Data File

C-score:

Confidence score

TM score:

Template modeling score

RMSD:

The root-mean-square deviation

SDM:

site directed mutagenesis

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Acknowledgements

The authors wish to thank Shiraz University of Medical Sciences for supporting the conduct of this research.

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Correspondence to Navid Nezafat or Younes Ghasemi.

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The authors declare no conflict of interests.

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Mortazavi, M., Torkzadeh-Mahani, M., Kargar, F. et al. In silico analysis of codon usage and rare codon clusters in the halophilic bacteria L-asparaginase. Biologia 75, 151–160 (2020). https://doi.org/10.2478/s11756-019-00324-w

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  • DOI: https://doi.org/10.2478/s11756-019-00324-w

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