Differential localization and potency of manganese porphyrin superoxide dismutase-mimicking compounds in Saccharomyces cerevisiae.

Journal Article (Journal Article)

Cationic Mn(III) porphyrin complexes based on MnTM-2-PyP are among the most promising superoxide dismutase (SOD) mimicking compounds being considered as potential anti-inflammatory drugs. We studied four of these active compounds in the yeast Saccharomyces cerevisiae, MnTM-2-PyP, MnTE-2-PyP, MnTnHex-2-PyP, and MnTnBu-2-PyP, each of which differs only in the length of its alkyl substituents. Each was active in improving the aerobic growth of yeast lacking SOD (sod1∆) in complete medium, and the efficacy of each mimic was correlated with its characteristic catalytic activity. We also studied the partitioning of these compounds between mitochondria and cytosol and found that the more hydrophobic members of the series accumulated in the mitochondria. Moreover, the degree to which a mimic mitigated the sod1Δ auxotrophic phenotype for lysine relative to its auxotrophic phenotype for methionine depended upon its level of lipophilicity-dependent accumulation inside the mitochondria. We conclude that localization within the cell is an important factor in biological efficacy in addition to the degree of catalytic activity, and we discuss possible explanations for this effect.

Full Text

Duke Authors

Cited Authors

  • Li, AM; Martins, J; Tovmasyan, A; Valentine, JS; Batinic-Haberle, I; Spasojevic, I; Gralla, EB

Published Date

  • 2014

Published In

Volume / Issue

  • 3 /

Start / End Page

  • 1 - 6

PubMed ID

  • 25462059

Pubmed Central ID

  • PMC4299968

Electronic International Standard Serial Number (EISSN)

  • 2213-2317

Digital Object Identifier (DOI)

  • 10.1016/j.redox.2014.09.003


  • eng

Conference Location

  • Netherlands