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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The bactericidal effect of human secreted group IID phospholipase A(2) results from both hydrolytic and non-hydrolytic activities

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Author(s):
Fonseca-Maldonado, Raquel [1] ; Ferreira, Tatiana Lopes [1] ; Ward, Richard J. [2]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, FMRP USP, Dept Biochem & Immunol, BR-14040901 Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, FFCLRP USP, Dept Chem, BR-14040901 Ribeirao Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Biochimie; v. 94, n. 6, p. 1437-1440, JUN 2012.
Web of Science Citations: 3
Abstract

The Human Secreted Group IID Phospholipase A(2) (hsPLA2GIID) may be involved in the human acute immune response. Here we have demonstrated that the hsPLA2GIID presents bactericidal and Ca2+-independent liposome membrane-damaging activities and we have compared these effects with the catalytic activity of active-site mutants of the protein. All mutants showed reduced hydrolytic activity against DOPC:DOPG liposome membranes, however bactericidal effects against Escherichia coli and Micrococcus luteus were less affected, with the D49K mutant retaining 30% killing of the Gram-negative bacteria at a concentration of 10 mu g/mL despite the absence of catalytic activity. The H48Q mutant maintained Ca2+-independent membrane-damaging activity whereas the G30S and D49K mutants were approximately 50% of the wild-type protein, demonstrating that phospholipid bilayer permeabilization by the hsPLA2GIID is independent of catalytic activity. We suggest that this Ca2+-independent damaging activity may play a role in the bactericidal function of the protein. (C) 2012 Elsevier Masson SAS. All rights reserved. (AU)