Proteome-based identification of signal peptides for improved secretion of recombinant cyclomaltodextrin glucanotransferase in Escherichia coli

How Lie Ling, Zaidah Rahmat, Abdul Munir Abd. Murad, Nor Muhammad Mahadi, Rosli Md Illias

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Secretion of recombinant proteins in heterologous host has drawn attention for its simpler purification and downstream processes. Searching for secretion aid molecules to improve protein secretion can be done through synthetic biology, screening of genome data and proteome-based approach. In the present study, the extracellular proteome on starch-containing medium of Bacillus lehensis G1 was analyzed to identify naturally secreted proteins with signal peptide. A total of 87 protein spots were identified by mass spectrometry, which were categorized mostly in the metabolism of carbohydrates and related molecules (20%). Over-expression and secretion studies were performed for all the 14 selected signal peptides fused to a reporter protein, cyclomaltodextrin glucanotransferase (CGTase). All clones were found to allow CGTase to be excreted into the medium, as observed and measured from the iodine plate assay and enzyme activity assay. Compared to native signal peptide (G1) of CGTase, signal peptide of GlcNAc-binding protein A (GAP) significantly improved CGTase activities by 735% and 205% in extracellular and periplasmic compartment, respectively, with an increase of only ∼1.7 fold the amount of β-galactosidase (cell lysis) in the medium. GAP has the highest secretion rate of 45.6. U/ml/h among all clones, where physicochemical characteristics of signal peptide play significant role.

Original languageEnglish
JournalProcess Biochemistry
DOIs
Publication statusAccepted/In press - 2017

Fingerprint

Proteome
Protein Sorting Signals
Escherichia coli
Proteins
Staphylococcal Protein A
Assays
Carrier Proteins
Clone Cells
Galactosidases
Synthetic Biology
Molecules
Carbohydrate Metabolism
Enzyme Assays
Enzyme activity
Bacilli
Recombinant proteins
Recombinant Proteins
Metabolism
Iodine
Starch

Keywords

  • Protein secretion
  • Proteome
  • Signal peptide

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology

Cite this

Proteome-based identification of signal peptides for improved secretion of recombinant cyclomaltodextrin glucanotransferase in Escherichia coli. / Ling, How Lie; Rahmat, Zaidah; Abd. Murad, Abdul Munir; Mahadi, Nor Muhammad; Illias, Rosli Md.

In: Process Biochemistry, 2017.

Research output: Contribution to journalArticle

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AU - Mahadi, Nor Muhammad

AU - Illias, Rosli Md

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