Effect of a Pseudomonas fluorescens tailocin against phytopathogenic Xanthomonas observed by atomic force microscopy

FERNANDEZ, MARICRUZ; GODINO, AGUSTINA; PRÍNCIPE, ANALÍA; MORALES, GUSTAVO M.; FISCHER, SONIA

JOURNAL OF BIOTECHNOLOGY

ELSEVIER SCIENCE BV

Año: 2017 vol. 256 p. 13 - 20

0168-1656

Phage tail-like bacteriocins, called tailocins, represent a class of protein complexes produced by Gram-negative bacteria. Pseudomonas fluorescens SF4c, a strain isolated from wheat rhizosphere, produces a bacteriocin similar to phage-like pyocins of Pseudomonas aeruginosa. This tailocin has antimicrobial activity against several phytopathogenic strains of the genus Xanthomonas and Pseudomonas. In this work, the effect of the SF4c tailocin on the phytopathogenic strain X. axonopodis pv vesicatoria Xcv Bv5?4a was analyzed through Atomic Force Microscopy (AFM). We demonstrated that tailocins adhere and cause damage to the cell envelope of strain Xcv Bv54a. This results in a rapid leakage of intracellular materials, with the subsequent decrease of cell volume. Finally, lysis of sensitive bacteria occurs. This study provides, to our knowledge, the first evidence about the effect of a tailocin analyzed by AFM. Further studies are in progress to evaluate the use of SF4c tailocin in the biocontrol of bacterial spot on tomato