Abstract
BackgroundSerratiopeptidase is an alkaline metalloendopeptidase, which acquired wide significance because of its therapeutic applications. The present study was undertaken for purification, characterization, and structural elucidation of serratiopeptidase produced from Streptomyces hydrogenans var. MGS13. ResultThe crude enzyme was purified by precipitating with ammonium sulfate, dialysis, and Sephadex gel filtration, resulting in 34% recovery with a 12% purification fold. The purified enzyme S.AMP13 was spotted as a single clear hydrolytic band on casein zymogram and whose molecular weight was found to be 32 kDa by SDS-PAGE. The inhibitor and stability studies revealed that this enzyme is metalloprotease, thermostable, and alkaline in nature. The maximum serratiopeptidase activity was observed at 37 °C and pH 9.0. The partial amino acid sequence of the purified enzyme S.AMP13 by LC-MS/MS analysis shows the closest sequence similarities with previously reported alkaline metalloendopeptidases. The amino acid sequence alignment of S.AMP13 shared a conserved C-terminus region with peptidase-M10 serralysin superfamily at amino acid positions 128–147, i.e., ANLSTRATDTVYGFNSTAGR revealed that this enzyme is a serralysin-like protease. The kinetic studies of the purified enzyme revealed a Km of 1 mg/mL for its substrate casein and Vmax of 319 U/mL/min. The 3D structure of the purified enzyme was modeled by using SWISS-MODEL, and the quality of the structure was authenticated by assessing the Ramachandran plot using PROCHECK server, which suggested that the enzyme was stable with good quality. ConclusionInhibitor, stability, electrophoretic, and bioinformatic studies suggested that the purified enzyme obtained from S. hydrogenans var. MGS13 is a serralysin-like protease.
Highlights
Serratiopeptidase is an alkaline metalloendopeptidase, which acquired wide significance because of its therapeutic applications
Purification of serratiopeptidase Serratiopeptidase produced by S. hydrogenans var
MGS13 was partially purified by precipitating the supernatant with different concentrations of ammonium sulfate to attain a maximum saturation
Summary
Serratiopeptidase is an alkaline metalloendopeptidase, which acquired wide significance because of its therapeutic applications. Peptidases are hydrolases that catalyze the hydrolysis of peptide and iso-peptide bonds that join amino acids within proteins, and based on the catalytic mechanism, peptidases are classified as metalloserine, aspartic, cysteine, and threonine [1] Among these proteases, metalloproteases represent the largest class of hydrolases that usually contain divalent metal ions at an active site which plays an important role in proteolysis. Serratiopeptidase obtained from Serratia E-15, an opportunistic pathogen, is being used in therapy for inflammation; due to its pathogenicity, the enzyme has been reported to cause lung and corneal damage [11]. This problem has necessitated screening of new microbial strains for producing the serratiopeptidase from novel sources with better therapeutic potential and desirable characters
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