Identification, characterization and immune response of prophenoloxidase from the blue swimmer crab Portunus pelagicus and its antibiofilm activity

Sangily Jayanthi, Baskaralingam Vaseeharan, Ramachandran Ishwarya, Sivashanmugam Karthikeyan, Marimuthu Govindarajan, Naiyf S. Alharbi, Shine Kadaikunnan, Jamal M. Khaled, Csaba Vágvölgyi

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Prophenoloxidase is a conserved Cu-containing enzyme acting as a major defense molecule in the immune response of crustaceans. In the present research, we purified prophenoloxidase from the haemolymph of Portunus pelagicus (Pp-proPO) by Blue Sepharose CL-6B chromatography. Pp-proPO exhibited only one band with molecular weight of 75 kDa on SDS-PAGE. The purified Pp-proPO was characterized through X-ray diffraction (XRD) and high-performance liquid chromatography (HPLC). Pp-proPO showed phagocytic activity on the yeast Saccharomyces cerevisiae as well as encapsulation on sepharose CL-6B beads associated with CM sepharose and beads of sodium alginate. Pp-proPO also led to strong agglutination on human erythrocytes. Furthermore, Pp-proPO showed magnified PO activity when altered with activated particles acting as pathogen combined molecular patterns (PAMPs), metal ions or other chemicals. Pp-proPO showed relevant antibiofilm activity on Gram negative bacteria Pseudomonas aeruginosa and Escherichia coli. Overall, the above results allowed us to claim that Pp-proPO play a key role in immune defense mechanisms of P. pelagicus crabs, in particular towards microbial pathogens; notably we added basic information to the functional characterization of Pp-proPO, as well as to understand its immunological role in crustaceans defense systems.

Original languageEnglish
Pages (from-to)996-1007
Number of pages12
JournalInternational Journal of Biological Macromolecules
Publication statusPublished - Jul 1 2018



  • Antibiofilm activity
  • Functional analysis
  • Portunus pelagicus

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology

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