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Probing in vivo Mn2+ speciation and oxidative stress resistance in yeast cells with electron-nuclear double resonance spectroscopy

Title
Probing in vivo Mn2+ speciation and oxidative stress resistance in yeast cells with electron-nuclear double resonance spectroscopy
Authors
McNaughton R.L.Reddi A.R.Clement M.H.S.Sharma A.Barnese K.Rosenfeld L.Gralla E.B.Valentine J.S.Culotta V.C.Hoffman B.M.
Ewha Authors
Joan S. Valentine
SCOPUS Author ID
Joan S. Valentinescopus
Issue Date
2010
Journal Title
Proceedings of the National Academy of Sciences of the United States of America
ISSN
0027-8424JCR Link
Citation
vol. 107, no. 35, pp. 15335 - 15339
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Manganese is an essential transition metal that, among other functions, can act independently of proteins to either defend against or promote oxidative stress and disease. The majority of cellular manganese exists as low molecular-weight Mn2+ complexes, and the balance between opposing "essential" and "toxic" roles is thought to be governed by the nature of the ligands coordinating. Mn2+. Until now, it has been impossible to determine manganese speciation within intact, viable cells, but we here report that this speciation can be probed through measurements of 1H and 31P electron-nuclear double resonance (ENDOR) signal intensities for intracellular Mn2+. Application of this approach to yeast (Saccharomyces cerevisiae) cells, and two pairs of yeast mutants genetically engineered to enhance or suppress the accumulation of manganese or phosphates, supports an in vivo role for the orthophosphate complex of Mn2+ in resistance to oxidative stress, thereby corroborating in vitro studies that demonstrated superoxide dismutase activity for this species.
DOI
10.1073/pnas.1009648107
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일반대학원 > 바이오융합과학과 > Journal papers
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