Expression and Isolation of N-Terminal Truncated Human Recombinant Renalase in Prokaryotic Cells
Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia; *e-mail: firstname.lastname@example.org
Keywords: renalase; protein expression; inclusion bodies; protein solubilization; isolation
Renalase (RNLS) is a flavoproteinin which its N-terminal peptide (residues 1-17) has several important functions. In cells, it participates in the formation of the so-called Rossmanfold (residues 2-35), needed for «accommodation» of the FAD cofactor and for performing the catalytic functions of RNLS as a FAD-dependent oxidoreductase (EC 188.8.131.52). RNLS secretion into the extracellular space is accompanied by cleavage of this peptide. The resultant truncated extracellular RNLS cannot bind FAD and therefore performs various noncatalytic functions. In this work, we have performed expression the genetic construct encoding RNLS lacking its N-terminal signal peptide (tRNLS) in E. coli Rosetta (DE3) cells. The recombinant protein was accumulated in inclusion bodies in an insoluble form, which could be solubilized in the presence of a high concentration of urea or guanidine chloride. In contrast to full-length RNLS, which was effectively solubilized in the presence of 8 M urea, tRNLS was preferentially solubilized in the presence of 6 M guanidine chloride.
Figure 3. Analysis of recombinant tRNLS solubilization from inclusion bodies in the buffer containing 6 М GdnHCl.
This work was supported by a grant from the Russian Foundation for Basic Research (project number 20–015–00104).
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