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Unveiling aminopeptidase P from Streptomyces lavendulae: Molecular cloning, expression and biochemical characterization

Paper ID Volume ID Publish Year Pages File Format Full-Text
17224 42653 2014 7 PDF Available
Title
Unveiling aminopeptidase P from Streptomyces lavendulae: Molecular cloning, expression and biochemical characterization
Abstract

•Cloned and expressed the aminopeptidase P (APP) gene of S. lavendulae in E. coli.•The expressed APP hydolysed the Xaa-Pro bond of bradykinin and substance P.•The recombinant enzyme shown a molecular weight of ≈60 kDa by SDS PAGE.•APP is a tetrameric metalloenzyme with manganese in the catalytic center.

Presence of proline residues in the second position of the N-terminus in peptides restricts the usage of many aminopeptidases; however, aminopeptidase P (APP) is capable of removing this blockage. Based on the N-terminal amino acid sequences of APP from Streptomyces lavendulae, app gene was cloned in pET28a(+) and over expressed as a His-tagged protein with a molecular weight of ≈60 kDa in Escherichia coli BL21 (DE3). Nucleotide sequencing revealed a 1467 bp open reading frame encoding 488 amino acids (NCBI Accession No: GenBank: KC292272.1). The substrate specificity of the recombinant APP was analyzed by the hydrolysis of the Xaa-Pro bond in Gly-Pro dipeptide and bradykinin. Km and Vmax of the enzyme were found to be 0.4697 mmol l−1 and 0.6396 μmol min−1, respectively. APP activity was enhanced in the presence of metal ions such as Co2+, Mn2+, Mg2+ and Cu2+ ions and was inhibited by 1,10-phenanthroline, EDTA, PMSF and DTT. The atomic absorption studies revealed the presence of Mn2+ in the protein as a co-factor. This substrate specific metalloenzyme was found to be a tetramer and optimally active at pH 8 and 37 °C.

Keywords
Streptomyces lavendulae; Aminopeptidase P; Gly-Pro-pNA; Bradykinin; Proline aminopeptidase; Metalloenzyme
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Unveiling aminopeptidase P from Streptomyces lavendulae: Molecular cloning, expression and biochemical characterization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 55, 5 February 2014, Pages 7–13
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us