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Azurocidin, a natural antibiotic from human neutrophils: expression, antimicrobial activity, and secretion

R P Almeida1, A Vanet, V Witko-Sarsat

  • 1Division of International Medicine and Infectious Diseases, Cornell University Medical College, New York, New York 10021, USA.

Protein Expression and Purification
|June 1, 1996
PubMed

Insights

Researchers produced recombinant azurocidin, a neutrophil antibiotic protein, in insect cells. The purified protein maintained antimicrobial activity, and a specific region was identified as crucial for its secretion.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • Human neutrophil azurophil granules contain serprocidins, a family of four homologous antibiotic proteins with serine protease similarities.
  • Azurocidin, a ser সার্বicidin family member, is a 29-kDa glycoprotein exhibiting broad-spectrum antimicrobial and monocyte chemotactic activities.

Purpose of the Study:

  • To produce recombinant azurocidin in an insect cell system.
  • To characterize the antimicrobial activity of recombinant azurocidin.
  • To identify regions of azurocidin involved in its secretion from insect cells.

Main Methods:

  • Transfection of insect cells with a baculovirus vector encoding azurocidin cDNA.
  • Purification of recombinant azurocidin from culture medium.
  • Assessment of antimicrobial activity of purified recombinant azurocidin.
  • Analysis of amino acid sequences to determine secretion-related regions.

Main Results:

  • Recombinant azurocidin was successfully produced in insect cells.
  • The purified recombinant azurocidin demonstrated antimicrobial activity comparable to the native neutrophil-derived protein.
  • A specific 49-amino-acid region within the recombinant azurocidin protein was found to be essential for its secretion from insect cells.

Conclusions:

  • Insect cells can be utilized for the production of functional recombinant azurocidin.
  • Recombinant azurocidin retains the native antimicrobial properties.
  • The identified 49-amino-acid region is critical for the secretion of azurocidin in this expression system.

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