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Indian J Microbiol. 2013 Mar;53(1):100-5. doi: 10.1007/s12088-012-0319-2. Epub 2012 Oct 19.

In Vitro Antibacterial Activity of Cysteine Protease Inhibitor from Kiwifruit (Actinidia deliciosa).

Indian journal of microbiology

Milica Popovic, Uros Andjelkovic, Milica Grozdanovic, Ivana Aleksic, Marija Gavrovic-Jankulovic

Affiliations

  1. Department of Biochemistry, Faculty of Chemistry, University of Belgrade, Belgrade, Serbia.
  2. Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Belgrade, Serbia.
  3. Institute of Virology, Vaccines and Sera Torlak, Belgrade, Serbia.

PMID: 24426085 PMCID: PMC3587517 DOI: 10.1007/s12088-012-0319-2

Abstract

The need for replacing traditional pesticides with alternative agents for the management of agricultural pathogens is rising worldwide. In this study, a cysteine proteinase inhibitor (CPI), 11 kDa in size, was purified from green kiwifruit to homogeneity. We examined the growth inhibition of three plant pathogenic Gram-negative bacterial strains by kiwi CPI and attempted to elucidate the potential mechanism of the growth inhibition. CPI influenced the growth of phytopathogenic bacteria Agrobacterium tumefaciens (76.2 % growth inhibition using 15 μM CPI), Burkholderia cepacia (75.6 % growth inhibition) and, to a lesser extent, Erwinia carotovora (44.4 % growth inhibition) by inhibiting proteinases that are excreted by these bacteria. Identification and characterization of natural plant defense molecules is the first step toward creation of improved methods for pest control based on naturally occurring molecules.

Keywords: Antibacterial; Cysteine protease inhibitor; Kiwifruit cystatin; Phytocystatin; Plant natural resistance

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