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The effects of photodynamic treatment with new methylene blue N on the Candida albicans proteome.

Brancini, GTP and Rodrigues, GB and Rambaldi, MDSL and Izumi, C and Yatsuda, AP and Wainwright, M and Rosa, JC and Braga, GÚL (2016) The effects of photodynamic treatment with new methylene blue N on the Candida albicans proteome. Photochemical and Photobiological Sciences, 12. pp. 1503-1513. ISSN 1474-905X

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Abstract

Candida albicans is a human pathogenic fungus mainly affecting immunocompromised patients. Resistance to the commonly used fungicides can lead to poor treatment of mucosal infections which, in turn, can result in life-threatening systemic candidiasis. In this scenario, antimicrobial photodynamic treatment (PDT) has emerged as an effective alternative to treat superficial and localized fungal infections. Microbial death in PDT is a consequence of the oxidation of many cellular biomolecules, including proteins. Here, we report a combination of two-dimensional electrophoresis and tandem mass spectrometry to study the protein damage resulting from treating C. albicans with PDT with new methylene blue N and red light. Two-dimensional gels of treated cells showed an increase in acidic spots in a fluence-dependent manner. Amino acid analysis revealed a decrease in the histidine content after PDT, which is one plausible explanation for the observed acidic shift. However, some protein spots remained unchanged. Protein identification by mass spectrometry revealed that both modified and unmodified proteins could be localized to the cytoplasm, ruling out subcellular location as the only explanation for damage selectivity. Therefore, we hypothesize that protein modification by PDT is a consequence of both photosensitizer binding affinity and the degree of exposure of the photooxidizable residues on the protein surface.

Item Type: Article
Uncontrolled Keywords: 0306 Physical Chemistry (Incl. Structural), 0601 Biochemistry And Cell Biology, 0299 Other Physical Sciences
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
R Medicine > RM Therapeutics. Pharmacology
Divisions: Pharmacy & Biomolecular Sciences
Publisher: Royal Society of Chemistry
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Date Deposited: 21 Mar 2017 11:13
Last Modified: 20 Oct 2017 00:50
DOI or Identification number: 10.1039/c6pp00257a
URI: http://researchonline.ljmu.ac.uk/id/eprint/4959

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