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Protein & Peptide Letters


ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

Research Article

Molecular Expression of Bioactive Recombinant Methionine Sulfoxide Reductase A (MsrA)

Author(s): M.S. Indhu, Shruthi Nanjundappa, Ramamoorthy Muttu, Upmanyu Vikramaditya, Manish Mahawar, Mihir Sarkar, Taru Sharma Guttula and Sanjeevkumar Bhure*

Volume 28, Issue 1, 2021

Published on: 25 June, 2020

Page: [11 - 17] Pages: 7

DOI: 10.2174/0929866527666200625201628

Price: $65


Background: The increase in reactive oxygen species (ROS) production during cryopreservation of semen, leads to oxidation of biomolecules affecting the functionality of spermatozoa. Methionine residues in proteins are highly prone to oxidation and get converted into methionine sulfoxide (MetO). Methionine sulfoxide reductase A (MsrA) can improve the functionality of spermatozoa by reducing the MetO to methionine restoring the lost functionality of the affected proteins.

Objective: The expression of catalytically active recombinant MsrA (rMsrA).

Methods: The msrA gene was PCR amplified, cloned and sequenced. Further, the recombinant clone was used for protein expression and purification. The protein was getting precipitated during dialysis in Tris-buffer. Hence, the purified rMsrA was dialyzed at 4°C against the Tris-buffer pH 7.5 containing MgCl2, KCl, NaCl, urea and triton X-100. During dialysis, changes of buffer were done at every 12 h interval with stepwise reduction in the concentrations of NaCl, urea and triton X-100. The final dialysis was done with buffer containing 10 mM MgCl2, 30 mM KCl, and 150 mM NaCl, 25 mM Tris–HCl pH 7.5. The activity of the rMsrA was checked spectrophotometrically.

Results: The protein BLAST of buffalo MsrA with bovine sequence showed 14 amino acid mismatches. The rMsrA has been purified under denaturing conditions as it was forming inclusion bodies consistently during protein expression. After renaturation, the purified 33 kDa rMsrA was catalytically active by biochemical assay.

Conclusion: The rMsrA expressed in prokaryotic system is catalytically active and can be used for supplementation to semen extender to repair the oxidatively damaged seminal plasma proteins that occur during cryopreservation.

Keywords: Buffalo, recombinant MsrA, expression, enzyme activity, spectroscopic method, biochemical assay.

Graphical Abstract
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